Circular sight glass fitting type 322A Class 150/1500 lbs Flange mounting similar to DIN 28121 suitable for supporting flanges according to ASME B 16.5

Mica discs are made from high quality muscovite mica and have excellent optical parameters, are smooth and resistant to scratches. Mica discs are available in different sizes and thicknesses. These can be fabricated per customer’s specifications. Without scratches, dust, dents, burrs, waviness and bubbles. Popular use of mica disks is the protection against erosion of the sight glasses and flat glasses in the flow viewfinders. Glass exposed to aggressive fluids, boiler water, steam, and working at high temperatures and pressures are subject to erosion visible as a dull surface of the glass. Glass layer losses cause a decrease in its strength and shorten the period of safe operation. The use of mica shields significantly reduces erosion of the glass and allows it to operate for a longer period of time. More on this topic can be found on the Mica shields page. Mica discs offered by us are die cut or lathe cut round discs, which find usage in liquid level indicators, breathing apparatus, communication devices, fuses and other end products.  Examples of applications: aluminosilicate and borosilicate glass protection against steam and water, glass protection from acids, reactive and corrosive substances. Mica disks eliminate the risk of cracking, fractures and splinters of glass.

Insensitive to vibrationNo heat radiation in the light port (cold light)No additional heat which would be undesirable for chemicaland/or biological processesExtreme high-contrast lighting

Borosilicate glass 3.3 is one of the most commonly used and well-known types of heat resistant glass. Its high silica content and significant boron oxide doping make it exceptionally stable. The material can be milled, drilled, ground, and toughened without losing its structural integrity. These characteristics, combined with its borosilicate glass strength, make it suitable for both industrial and scientific uses. This type of boro glass performs reliably at elevated temperatures and is thermally stable up to 450 °C under continuous use. Its borosilicate glass temperature stability is a primary reason why it is frequently selected for laboratory setups and chemical reactors. Additionally, borosilicate glass 3.3 maintains excellent mechanical strength even in low-temperature conditions, with operational capability down to -196 °C, making it compatible with cryogenic substances like liquid nitrogen. For optimal safety, the temperature difference during thawing should not exceed 100 K; typically, operation down to -70 °C is recommended. Thanks to its outstanding chemical resistance, this borosilicate glassware is impervious to water, acids, alkalis, and most organic solvents. As such, it is extensively used in pharmaceutical manufacturing, scientific research, and chemical processing plants. The borosilicate glass properties of type 3.3 also make it a material of choice for borosilicate glass dishes, beakers, flasks, and other laboratory vessels. Suprax 8488, Pyrex, Boronorm & Borofloat Other types of borosilicate glass, such as Suprax 8488, Pyrex, and Boronorm, offer comparable borosilicate glass hardness and resistance to chemical and thermal stresses. Suprax 8488 is known for its consistency and is often used in technical lighting and optical applications. Pyrex, a widely recognized brand name, is commonly found in consumer borosilicate glass products like cookware and bakeware. These borosilicate glass dishes resist staining, cracking, and thermal deformation, making them ideal for use in ovens and microwave environments. Borofloat is another premium borosilicate glass variant designed for optical, display, and semiconductor applications. Its exceptionally smooth surface and excellent flatness, combined with its inherent borosilicate glass strength, make it indispensable in high-tech industries. Whether used in analytical instruments or microelectronics, Borofloat ensures consistent performance under stress. Applications of borosilicate glass The variety of borosilicate glass applications is as vast as its properties. It is widely used in: Laboratory borosilicate glassware (beakers, test tubes, measuring cylinders) Domestic borosilicate glass products (bakeware, cookware, coffee carafes) Pharmaceutical containers (vials, ampoules) Chemical processing equipment (reactors, pipelines) Optical components (lenses, filters) High-intensity lighting systems (projector lamps, automotive bulbs) Solar energy systems (glass tubing, photovoltaic module covers) Display technology (substrates for TFT and OLED displays) The heat resistance of glass in these applications is crucial for maintaining dimensional stability and ensuring longevity. For instance, borosilicate glass dishes used in kitchens can transition directly from freezers to ovens without risk of breakage due to the material’s thermal shock resistance. Why choose borosilicate glass? To summarize, borosilicate glass combines chemical inertness, high mechanical strength, and remarkable temperature resistance, making it one of the most versatile materials available. Its hardness, clarity, and processability further enhance its desirability across numerous industries. Whether you are selecting materials for a high-performance optical lens, a laboratory flask, or a heat-resistant baking dish, borosilicate glass delivers outstanding performance. We supply a full range of borosilicate glassware and custom borosilicate glass products tailored to your specific needs. With several types of borosilicate glass available, including borosilicate glass 3.3, Suprax, Borofloat, and Pyrex, our product line meets the highest standards in modern engineering and design. Composition SiO2  80 % B2O3  13 % Na2O  4 % Al2O3  2 % K2O  1 %   Standard thicknesses and tolerances Thickness Tolerance Thickness Tolerance 0,70 mm ±0,1 7,5 mm ±0,3 1,10 mm ±0,1 8,0 mm ±0,3 1,75 mm ±0,2 9,0 mm ±0,3 2,00 mm ±0,2 13,0 mm ±0,5 2,25 mm ±0,2 15,0 mm ±0,5 2,75 mm ±0,2 16,0 mm ±0,5 3,30 mm ±0,2 17,0 mm ±0,5 5,00 mm ±0,2 18,0 mm ±0,5 5,50 mm ±0,2 19,0 mm ±0,5 6,50 mm ±0,2 21,0 mm ±0,7   Properties: Density (@ 20 °C) 2 230 kg/m3 Bending strength 160 N/mm2 Surface compressive stress 100 N/mm2 Young’s modulus  64 GPa Poisson’s ratio 0,2 Hardness 5.5 Mohs, (470 Knopp, 580 Vickers) Thermal conductivity 1,2 W/(m K) Specific Heat 0,83 kJ/(kg K) Coefficient of linear expansion 3,3 ±0,1 * 10 -6 °C Index of refraction (@ 380 - 780 nm) 1,48  Softening point 815 °C Annealing Point 560 °C Max. working temperature: Non-tempered glass    - long term 450 °C  - temporary(< 10h) 500 °C Tempered glass    - long term 280 °C  - temporary(< 10h) 500 °C   Chemical properties: Hydrolytic Resistance   Acc.  ISO 719 (w 98 °C): class HGB 1    Acc.  ISO 720 (w 121 °C): class HGA 1  Alkali resistance   Acc. DIN 52 322 (ISO 695): class A2 Acid resistance   Acc. DIN 12 116: class 1 Electrical properties Volume resistance    at 25°C = 6.6 x 1013 Ω cm    at 300°C = 1.4 x 106 Ω cm Dielectric properties Electric Volume Resistivity         8,6 x 1013 Ωcm (at   25 °C)   1.4 x 106   Ωcm (at 300 °C) Dielectric dissipation fraction   38  10-4 (at 1 MHz, 20 °C) Dielectric constant εr   4.6 (at 1 MHz, 20 °C)   Optical properties Index of Refraction Spectral Transmission    λ = 587,6 nm nD = 1,4724    λ = 480,0 nm nF = 1,4782    λ = 546,0 nm nE = 1,4740    λ = 644,0 nm nC = 1,4701    Borosilicate glass 4.3 SiO2  78 % B2O3  10% Na2O  7 % Al2O3  3% ZrO2  2 %   Properties: Density (@ 25  °C) 2 280 kg/m3 Flexural strength 25 MPa Modulus of elasticity (Young’s) 67 GPa Poisson’s ratio 0,20 Thermal conductivity (@ 90 °C) 1,2 W/(m K) Specific heat 0,83 kJ/(kg K) Coefficient of linear expansion  (@ 20 °C - 300 °C) 4,3  * 10 -6 °C Index of Refraction (λ=587,6 nm) 1,484  Softening point 810 °C Annealing point 580 °C Glass temperature for density dPas 1013,0    560 °C10 7,6    800°C10 4,0   1200°C Working temperature:  - maximum 500 °C  - in a heavy duty conditions 280 °C   Chemical properties   Hydrolytic Resistance   Acc.   ISO 719 (@ 98 °C): class HGB 1    Acc.   ISO 720 (@ 121 °C): class HGA 1  Alkali resistance   Acc. DIN 52 322 (acc. ISO 695): class A2 Acid resistance   Acc. DIN 1776: class 1 Electrical properties Volume resistance    @ 25°C = 6.6 x 1013 Ω cm    @ 300°C = 1.4 x 106 Ω cm Dielectric properties @ 25° C and 1 MHz:    Dielectric constant εr=4,6    Dielectric loss factor tgδ =1,4x10-2   Optical properties Index of Refraction Spectral Transmission    λ = 587,6 nm nD = 1,4816    λ = 480,0 nm nF = 1,4869    λ = 546,0 nm nE = 1,4831    λ = 644,0 nm nC = 1,4802      While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data. In this text you will learn about borosilicate glass: properties, strength, thermal and chemical resistance, types, and applications in laboratory, industrial, optical, and domestic environments. Properties and applications of borosilicate glass Borosilicate glass is a specialized type of glass that contains significant amounts of silica (SiO₂) and boron trioxide (B₂O₃), making it highly resistant to thermal shock and chemical corrosion. Known for its durability, clarity, and stability under temperature fluctuations, borosilicate glass is widely used in laboratory, industrial, and domestic applications. Often referred to as boro glass, this material exhibits unique performance characteristics that set it apart from conventional soda-lime glass. One of the key properties of borosilicate glass is its exceptional resistance to temperature changes. This heat resistant glass can withstand both extremely high and low temperatures, making it suitable for demanding environments. The borosilicate glass temperature resistance allows it to endure up to 450 °C during long-term use and down to -196 °C when in contact with substances like liquid nitrogen. These attributes are a result of its low coefficient of thermal expansion, which ensures the glass does not crack or deform when exposed to rapid temperature changes. Another significant feature is the borosilicate glass strength and durability under mechanical and thermal stress. The typical hardness of borosilicate glass is rated at 5.5 on the Mohs scale, with corresponding values of 470 on the Knoop scale and 580 on the Vickers hardness test. These measures confirm the high borosilicate glass hardness, making it ideal for situations that demand both precision and resilience. The versatility of borosilicate glass arises from the ability to modify its chemical composition by incorporating various metal oxides. These variations result in a broad range of borosilicate glass products, each tailored for specific applications. The boron oxide content in the glass batch—i.e., the mix of raw materials used in the production process—plays a crucial role in defining not only the borosilicate glass properties, but also the behavior of the molten glass during manufacturing. At our facility, we offer several types of borosilicate glass, including: Borosilicate glass 3.3 (DIN 7080) Borosilicate glass 4.3 Suprax 8488 Pyrex Boronorm Borofloat Each of these borosilicate glass types features unique compositions and is suited for various borosilicate glass applications, from laboratory glassware and cookware to high-performance optics and chemical equipment. To work in an environment of steam and hydrostatic applications we offer borosilicate glass 4.3. Resistance to chemicals and thermal expansion permit the use of a high level of hardening, so that the glass are characterized by high resistance to thermal shock. Is suitable for operation at low temperatures. Can withstand the temperature to about -196 °C (is suitable for use in contact with liquid nitrogen). During thawing ensure that the temperature difference does not exceed 100 K. In general is recommended for use down to -70 °C.

JGS-1 (Synthetic Quartz Silica) glass is equivalent to Suprasil 1 and 2 (Heraeus), Spectrosil A and B (Saint-Gobain) and Corning 7940 (Corning), Dynasil Dynasil 1100 and 4100 (Dynasil). It is made of synthetic silica of very high purity (SiO2 over 99.9999%). Colorless quartz glass combines a low coefficient of thermal expansion and good optical properties and excellent transmittance in the ultraviolet. JGS1 glass is transparent to ultraviolet and visible light. Contains dopant OH groups causing low transmittance in infrared range of  in 1.4 µm, 2.2 µm, 2.7 µm. JGS-1 glass is used in the wavelength range from deep ultraviolet light through a range of visible light (laser lenses, windows, prisms, solar cells, etc.). This glass is practically free from bubbles and inclusions.   It is a glass with a very high content of pure silica (SiO2 ≥ 99.9%) abstracted eg. with quartzites and rock crystals. It is resistant to water and strong acids (excluding hydrofluoric acid) and low resistance (as compared with other types of glass) to alkali. Quartz glass has a high melting point and a low coefficient of thermal expansion, which makes it resistant to sudden changes in temperature (thermal shock resistance). Transmits ultraviolet and infrared light. The scope and level of transmittance is dependent on the additives used in smelting. Depending on the technological process (melt process) are distinguished by: natural quartz - thanks to a low content of impurities and trace elements, natural quartz is suitable for operation at high temperature (> 1000°C), and for applications requiring optical transmittance from the ultraviolet to the infrared. synthetic quartz - by the use of pyrolysis in the glass melt obtained homogeneous with good transmittance for ultraviolet radiation (as from 170 nm) An important parameter in choosing the right kind of quartz glass is a transmittance of electromagnetic radiation. Various types of glass permeable to different degrees various ranges of radiation. The figure below shows the distribution of electromagnetic radiation spectrum ranges and subranges in respect of infrared and ultraviolet. Depending on the application, should be selected quartz glass generate ozone (VUV region) or acting bactericidal (UV-C region). Near and medium infrared (NIR regions, MIR) are used for heating and drying. Quartz glass, depending on the type, well permeable to radiation in the range of UV-C to MIR (from approx. 100 nm to 3 500 nm). Figure transmittance of electromagnetic radiation (light) is illustrated below for each of this type of quartz glass.   Quartz glass JGS-2 (Fused Quartz) is equivalent to: GE214, Homosil glasses 1, 2 and 3 (Heraeus), Dynasil 1000, 4000, 5000 and 6000 (Dynasil). It is made of natural silica (sand, crystals) of high purity (SiO2 over 99.99%). Provides good transmittance for visible light and ultraviolet. It is a good material for use in the band from 220 nm to 2500 nm. Physical and chemical properties are similar to the glass JGS-1. It may contain a small amount of bubbles and inclusions. JGS-2 glass is used in applications where the main criterion is the ability to work at high temperatures and resistance to thermal shock. The most common applications are: optics, high-temperature and high-pressure equipment, glass viewing window, microscope slides, laboratory equipment.   Quartz glass JGS-3 (Infrared Optical Quartz) is the equivalent of a glass Suprasil 300 (Heraeus). It is made of synthetic silica of high purity. It combines excellent physical properties with excellent optical characteristics. It is transparent over a wide band ranging from deep ultraviolet to full infrared. It is a material having excellent light transmittance. Normally used in IR, but also in implementations requiring a broad range of wavelengths from the UV to the IR-d-m. Glass JGS-3 is used at wavelengths from 260 nm to 3500 nm. Products made of JGS-3 quartz are available as plates up to 300x200 mm and a thickness of 1 - 5 mm as well as discs with a diameter of up to 200 mm and a thickness of up to 10 mm. Other dimensions on request. Quartz glasses JGS-1, JGS-2  and JGS-3 differ mainly in the scope of the transmitted electromagnetic radial: JGS-1 glass - passes ultraviolet radiation, practically free of bubbles and inclusions range of applications starting from 170 nm to 2500 nm; does not pass the range 2600 - 2800 nm, suppresses infrared radiation,  JGS-2 glass - good transmittance of visible and ultraviolet light; may contain small amounts of bubbles and inclusions, is a good material for use in the band from 220 nm to 2500 nm range; does not pass the range 2600 - 2800 nm JGS-3 glass - passes infrared radiation well, good material for applications in the range 260 nm to 3500 nm.   Physical and chemical properties of these of glasses are similar and are shown below. Properties of quartz glasses JGS-1, JGS-2 and JGS-3: Density and thermal expansion coefficient   Glass type Density [g/cm3] Thermal expansion coefficient（α×10ˉ7/℃) 0℃ 50℃ 100℃ 300℃ 500℃ 800℃ 1000℃ JGS-1 2.201 3.9 4.8 5.15 6.12 5.4 4.65 4.26 JGS-2 2.203 3.9 4.8 5.15 6.12 5.4 4.65 4.26 JGS-3 2.203 3.9 4.8 5.15 6.12 5.4 4.65 4.26   Other parameters: Parameter Value Purity SiO2:99.95-99.99% Modulus of elasticity (Young’s) 72 GPa Poisson’s ratio 0,14 - 0,17 Mohs hardness  5,5 - 6,5 Compressive strength 1 100 N/mm2 Tensile strength 48  N/mm2 Flexural strength 67 N/mm2 Thermal conductivity 1,4 W/(m K) Specific heat 0,670 kJ/(kg K) Annealing point 1215 °C Softening point 1683 °C Thermal shock ΔT  >1 400 °C Max. working temperature:   - long term 1 100 °C  - temporary 1 300 °C   Optical properties Refractive index   Range code/ glass type ∩g ∩F ∩e ∩d ∩D ∩c JGS-1 1.46669 1.46314 1.46007 1.45847   1.45637 JGS-2 1.46679 1.46324 1.46021 1.45857   1.45646 JGS-3 1.46679 1.46324 1.46021 1.45857   1.45646   Chemical properties Hydrolytic resistance   Acc.  ISO 719 (@ 98 °C): class HGB 1    Acc.  ISO 720 (@ 121 °C): class HGA 1  Alkali resistance   Acc. DIN 52 322 (acc. ISO 695): class A2 Acid resistance   Acc. DIN 12 116: class 1 Electrical properties Resistivity    @    20°C = 1 x 1016 Ω cm    @  400°C = 1 x 108 Ω cm    @  800°C = 6,3 x 104 Ω cm    @1200°C = 1,3 x 103 Ω cm Dielectric properties @25° C i 1 MHz:    dielectric constant εr=3,7 - 3,9    loss tangent        tgδ =1 x10-4   There are many different names used in quartz glass name terminology. In the document below (ready for download) we discuss some of them and give you the most important information about properties and areas of application of glasses from the JGS-x group.   Milky (Opaque, Satin) Quartz Glass JGSM The opacity of a quartz glass is obtained by adding the air during the melting process of silica sand. At a temperature of approx. 2000 ° C produced a glassy material with lots of bubbles, causing light scattering and opacity suitable material. The quality of the material is determined by the uniformity of distribution of bubbles, their size and shape. Many small vesicles (approx. 10 µm) scatter light better than bubbles large and very few (eg. 50 - 150 microns) - giving an opacity effect worse, especially at small thicknesses of material. Milky quartz, known also as Opaque Quartz Glass or Satin Quartz Glass, due to scattering of radiation in the micropores, is a very good thermal insulator, blocks IR, has a microporous structure with a high density and smooth surface. It can be machined at a reasonable cost. It is opaque, it can be used at high temperatures (constant operating temperature up to 1100 ° C) and chemically aggressive environments. Low porosity of the material allows to obtain properties similar to fused quartz, while the possibility of gas welding without material shrinkage smooth and without joints. It can be combined with a transparent quartz. If applied flame polishing, the surface micropores disappears  (cicatrize), creating a clean, smooth surface. Does not arise the "orange peel" effect. In addition to improving cosmetic appearance, smoother surface allows the use of thin seals in vacuum applications. In addition, reduced porosity increases the resistance of the material of hydrofluoric acid (HF). Flame smoothed surfaces are smooth, even after long-term HF acid. The advantages of material: excellent thermal insulator blocking UV and IR high maximum operating temperature very smooth surface high chemical purity high chemical resistance good mechanical resistance does not shrink during fire polishing, can be easily welded to the transparent quartz, easy sealing in high pressure applications. Resistance to 5% hydrofluoric acid (HF) Specialized applications requiring increased chemical and thermal resistance, high and uniform level of light scattering should be based on the use of materials produced by recognized manufacturers such as Heraus (OM100, RotoSil   OFM 70, OFM 370, 970 OFM OSC) or Momentive (GE514, GE544).      While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

The method of sizing:   DiameterD [mm] Widths [mm] Pressure[bar] Notes 24 10 150 disc special size 30 12 150 disc special size 15 200 disc special size 31,6 12,75 150 disc special size   Aluminosilicate 33 14 150 disc special size 33,12 15,95   Aluminosilicate 34 17 200 disc special size   Aluminosilicate 35 7 25 disc special size 40 10 40 disc special size 12 50 disc special size 44 10 40 disc special size 12 50 disc special size 45 10 40 acc. DIN 7080 12 50 acc. DIN 7080 50 10 25 acc. DIN 7080 12 40 acc. DIN 7080 55 6,5 6 disc special size 10 25 disc special size 60 10 16 acc. DIN 7080 12 25 acc. DIN 7080 15 40 acc. DIN 7080 20 95 disc special size 63 8 8 disc special size 10 16 acc. DIN 7080 12 25 acc. DIN 7080 15 40 acc. DIN 7080 65 10 12 disc special size 15 40 disc special size 70 12 16 disc special size 15 25 disc special size 75 12 16 disc special size 80 10 10 disc special size 12 16 acc. DIN 7080 15 25 acc. DIN 7080 20 40 acc. DIN 7080 86 12 10 disc special size 90 10 8 disc special size 92 10 8 disc special size 94 12 10 disc special size 95 10 6 disc special size 15 16 disc special size 100 10 7 disc special size 12 10 disc special size 15 16 acc. DIN 7080 20 25 acc. DIN 7080 25 40 acc. DIN 7080 105 15 16 disc special size 110 12,5 10 disc special size 20 25 disc special size 113 15 10 disc special size 115 15 10 disc special size 120 10 4 disc special size 15 10 disc special size 18 16 disc special size 125 15 10 acc. DIN 7080 20 16 acc. DIN 7080 25 25 acc. DIN 7080 30 40 disc special size 130 15 10 disc special size 135 15 8 disc special size 25 25 acc. DIN 7080 140 15 8 disc special size 150 10 2 disc special size 15 8 disc special size 20 10 acc. DIN 7080 25 16 acc. DIN 7080 30 25 acc. DIN 7080 160 20 12 disc special size 170 15 5 disc special size 20 10 disc special size 175 20 10 acc. DIN 7080 25 16 acc. DIN 7080 30 25 acc. DIN 7080 200 20 8 acc. DIN 7080 25 10 acc. DIN 7080 30 16 acc. DIN 7080 210 25 10 disc special size 250 20 4 disc special size 25 8 acc. DIN 7080 30 10 acc. DIN 7080 265 30 8 acc. DIN 7080   Note: if in the column Notes otherwise stated, borosilicate glass "extra hard" is used Round sight glasses are delivered separately or in a set with gaskets and mica shield. If you can not find the size - please contact us. Tolerances Diameter (d1):d1 ≤ 125 mm125 mm < d1 ≤ 200 mm d1 > 200 mm  ± 0,5 mm± 0,8 mm± 1,0 mm     Thicknes (s):s ≤ 20 mm s > 20 mm  + 0,5 mm / -0,25 mm+ 0,8 mm / -0,40 mm  Flatness (e):d1 ≤ 100 mm100 mm < d1 ≤ 150 mm 150 mm < d1 ≤ 200 mmd1 > 200 mm 0,05 mm0,08 mm0,12 mm0,15 mm    Parallelity (p):d1 ≤ 100 mm100 mm < d1 ≤ 200 mm d1 > 200 mm 0,20 mm0,25 mm0,30 mm Calculation of the glass thickness s - theoretical minimum glass thicknes [mm] dm => (d1+d2)/2 => average sealing diameter [mm]d1 - glass and sealing outside diameter [mm]d2 - sealing inside diameter [mm]p - permisible presure [bar] δbB - min. value of surface comressive stress [N/mm2] S - safety factor        Our offer includes sight glasses made of various materials, depending on environmental conditions (temperature, pressure, aggressive media). The properties of various glass materials are described on page Types of materials in chapter Our offer/Technical glass. The basic types of materials used for the manufacture of sight glasses are: soda-lime glass - widely available, cheap, working temperature up to 280 °C,  borosilicate glass - particularly suitable for use in aggressive environments (acids, alkalis, water vapor), working temperature up to 350 °C, aluminosilicate glass -  working temperature up to 660 °C, glass-ceramics - thermal shock resistant, working temperature up to 750 °C, quartz glass - with a broad spectrum light transmittance (from ultraviolet to infrared), working temperature up to 1100 °C, sapphire products - working temperature up to 2000 °C. To improve the strength, the machined glass is subjected to toughening and annealing. In order to increase the resistance of sight glasses on the aggressiveness of the working environment and in the use of high temperatures and pressures, additional use of mica shield is recommended. Mica disc working as shields are described here.  If you need this solution - please contact us. Round sight glasses are delivered separately or in a set with gaskets. Gaskets for sight glasses are described here. We offer sight glasses manufactured by leading brands such as: Spectraglass, Klinger or Maxos, which guarantees high quality and stability of parameters.   Safety precautions when using sight glass discs: Whenever a sight glass assembly has been taken apart it is urgently recommended in accordance with DIN 7080/ DIN 8902 that the glass disc and gaskets are replaced by new ones. That is particularly important in the case of pressure vessels and/or aggressive media. The following extract from DIN 7080/DIN 8902 text is verbatim: Sight glass discs may only be installed by personnel who have been informed fully about the following requirements: care in handling sight glass discs cleaning of recesses, sight glass discs, gaskets and other parts i. e. removal of foreign bodies (e. g. swarf), prior to installation/reassembly even tightening of retaining bolts Sight glass discs that have been removed after operating use must not be re used. Planned maintenance:Sight glass discs should be included in routine maintenance and periodically checked visually or using ultrasound wall thickness measuring means. In the event of damage, a glass disc must be promptly exchanged, with the plant first having been brought to a standstill. The service life of a sight glass, relative to the particular vessel in which it is mounted, should be established by regular and careful visual check of its condition.Caution: Completely demineralised water may dissolve glass – especially intensive periodical inspection required! Breakage of a sight glass:In spite of careful installation and recommended use, sight glass discs can, on rare occasions, suffer breakage through external influences. In order to prevent the entry of glass particles into products of a critical nature, e. g. foodstuffs, appropriate safety precautions should be taken by the plant manufacturer or user.  

Cover flange Glass cushion Sight glass PTFE coated encased corrugated ring gasket Base flange Screws Our round sight glasses type 321A are screwed onto flanges according to ASME B16.5 to allow for observation or illumination of the container interior. ACI sight glasses of type 321A are constructed according to DIN 28121 for operating pressures up to 20 barg. Between two high-quality stainless steel flanges and a media-side PTFE-coated corrugated gasket, a sight glass made of chemically highly resistant MAXOS® borosilicate glass DIN7080 is clamped. Since this gasket is in force shunt, the flange parts of the sight glass lie directly on top of each other and thus protect the glass plate as effectively as possible. The type 321A is delivered pre-assembled from the factory and can be screwed directly onto a flange according to ASME B16.5 without any additional effort. Should the unlikely event occur that the glass is damaged during operation, the entire fitting can be replaced with little effort. Our sight glasses of type 321A are made from high-quality stainless steels 1.4571 (316Ti) or 1.4404 (316L). As glass material, the industrially proven MAXOS® borosilicate glass according to DIN 7080 is used. The sealing in force shunt prevents settling of the gaskets, so that re-tightening of the tension screws on site is no longer necessary. The PTFE-coated gasket makes the sight glass type 321A suitable for food, acids, alkalis, and most aggressive chemicals. If the borosilicate glass DIN 7080 does not meet your requirements, or if the process conditions themselves pose a problem for the highly resistant borosilicate glass, a custom-fitted mica protection disc offers additional protection against temperature and steam. FEP or Halar® coatings additionally protect the borosilicate glass from aggressive chemicals or alkalis. Like other sight glass fittings, the type 321A can be equipped with a wiper type SGW, spraying devices SVII, or lights upon request. Cross-sectiondrawing Dimensions NPS 2“ 3“ 4“ 5“ 6“ 8“ Di [mm] 65 80 100 125 125 150 H [mm] 41 50 59 66 66 66 Da [mm] According to ASME B 16.5 L [mm] K [mm] Weight [kg] 3.8 8 13.5 17.4 23 36.7  

Cover flange Glass cushion Sight glass Gasket Base flange Screws The container sight glass type 322 for high-pressure applications is a solid fitting based on the design principles set forth in the industrial standard DIN 28121. Through the significantly reinforced flange and the use of glass plates beyond the standard dimensions of DIN 7080, it is possible for us with type 322 to achieve operating pressures of up to 160 barg. The tensioning of the glass occurs similarly to our proven type 322 through pre-tensioning screws. This ensures that the fitting only needs to be properly attached to the carrier flange in your system to achieve the necessary sealing. An execution for elevated temperatures is also feasible through the use of appropriate seals and glass materials. Due to the high operating pressure, the installation of wipers and spraying devices is unfortunately not possible with type 322. Lighting based on LED lighting elements is available from us. Should the borosilicate glass not meet your requirements similar to DIN 7080, or if the process conditions themselves pose a problem for the highly resistant borosilicate glass, a mica protective disc specifically adapted for the fitting offers additional protection against temperature and steam. FEP or Halar® coatings additionally protect the borosilicate glassagainst aggressive chemicals or caustics. Cross-sectiondrawing Dimensions DN 40 50 80 100 Di [mm] 40 50 80 100 H (PN 40) [mm] 84 84 84 104 H (PN 63) [mm] 84 84 84 104 H (PN 100) [mm] 84 104 104 104 H (PN 160) [mm] 94 104 104 121 Da [mm] According to DIN EN 1092-1 L [mm] K [mm]  

Cover flange Glass cushion Sight glass Graphite composite gasket Base flange Screws The ACI sight glass type 323 is a variation of type 321, designed for an expanded range of applications, especially at higher temperatures. They serve to observe and illuminate the interior of sealed containers (container, boilers, tanks, silos, etc.). The PTFE-coated corrugated ring gaskets typically used in type 321 are no longer reliably usable above a temperature of 200 °C. To eliminate this disadvantage, we use high-quality graphite composite seals in type 323, so that the operating range of the borosilicate glass plates according to DIN 7080 can be fully utilized up to 280 °C, or even 320 °C with a mica disc. Even at temperatures above the limits of DIN 7080, type 323 can be used without problems with untempered borosilicate glass plates up to 400 °C. For higher temperatures, please inquire. With the sealing in the force shunt, type 323 offers you the same advantages as our proven type 321. Here, too, the glass plate is best protected over the entire circumference, and the fitting can be easily installed or exchanged as a single component. The fitting is completely assembled at the factory and can, upon request, be tested for pressure resistance and tightness, so you can rely 100% on our quality. Like type 321, type 323 can also be supplied with LED lighting upon request. Cross-sectiondrawing Dimensions DN 40 50 80 100 125 150 200 Di [mm]PN 10 48 65 80 100 125 125 150 H [mm]PN 10 36 38 46 46 54 54 54 Da [mm]PN 10 150 165 200 220 250 285 340 L [mm]PN 10 18 18 18 18 18 22 22 K [mm]PN 10 110 125 160 180 210 240 295 Weight [kg]PN 10 3,8 4,6 8,2 9,3 13,8 19,5 28,7 H [mm]PN 25 38 41 50 59 66 66 66 Da [mm]PN 25 150 165 200 235 270 300 360 L [mm]PN 25 18 18 18 22 26 26 26 K [mm]PN 25 110 125 160 190 220 250 310 Weight [kg]PN 25 4 5 8,9 14 20 26,9 39,3