Circular sight glass fitting type 322 PN 40/160 For flange mounting similar to DIN 28121

Cover flange Glass cushion Sight glass Gasket Base flange Screws The sight glass fitting Type 322A for high-pressure applications is a solid fitting based on the construction principles defined in the industrial standard DIN 28121. Thanks to the significantly reinforced flange and the use of glass plates beyond the standard dimensions of DIN 7080, we are able to achieve working pressures of up to 250 barg. The tensioning of the glass is carried out similarly to our proven Type 322A through tension screws. This ensures that the fitting only needs to be properly fixed to the carrier flange in your system to achieve the necessary sealing. An execution for elevated temperatures can also be realized through the use of suitable gaskets and glass materials. Due to the high working pressure, the installation of wipers and spraying devices is unfortunately not possible with Type 322A. Lighting based on LED light sources is available from us. If the borosilicate glass similar to DIN 7080 does not meet your requirements, or if the process conditions themselves pose a problem for the highly resistant borosilicate glass plate, a mica protective disc specially adapted for the fitting offers additional protection against temperature and steam. FEP or Halar® coatings additionally protect the borosilicate glass from aggressive chemicals or lyes. Cross-sectiondrawing Dimensions NPS  1 ½“ 2“ 3“ 4“ Di [mm] 40 50 80 100 H [mm]  Depending on the ANSI Class Rating and NPS Da [mm] According to ASME B 16.5 L [mm] K [mm] Other sizes available on request  

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.

Cover flange Glass cushion Sight glass PTFE coated encased corrugated ring gasket Base flange Screws Our round vessel sight glasses type 321 are screwed onto flanges according to DIN EN 1092-1 to allow for observation or illumination of the interior of the vessel. ACI vessel sight glasses of type 321 are designed according to DIN 28121 for operating pressures up to 10 or 25 barg. Here, a sight glass made of chemically highly resistant borosilicate glass DIN 7080 is clamped between two high-quality stainless steel flanges and a media-side PTFE-coated corrugated ring gasket. Since this gasket is situated in the force shunt, the flange parts of the sight glass are directly aligned with each other, thus protecting the glass plate as much as possible. The type 321 is delivered pre-assembled from the factory and can be mounted directly onto a flange according to DIN EN 1092-1 without additional effort. Should the unlikely event occur that the glass is damaged during operation, the entire fitting can be replaced with little effort. Our vessel sight glasses of type 321 are made from high-quality stainless steels 1.4571 (316Ti) or 1.4404 (316L). The glass material used is the industry-proven MAXOS® borosilicate glass according to DIN 7080. The sealing in the force shunt prevents settling of the gaskets, making it unnecessary to retighten the tension screws on site. The PTFE-coated gasket makes the vessel sight glass type 321 suitable for food, acids, alkalis, and most aggressive chemicals. If the borosilicate glass DIN 7080 does not meet your requirements or the process conditions themselves pose a problem for the highly resistant borosilicate glass, a custom-made mica protection plate for the fitting provides additional protection against temperature and steam. FEP or Halar® coatings additionally protect the borosilicate glass from aggressive chemicals or alkalis. As with other sight glass fittings, type 321 can be equipped upon request with a sight glass wiper type SGW, spray devices SVII, or lights. 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  

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