Level indication type 411 PN40 with rear welding ends

Screws Cover frame Glass cushion Sight glass Gasket Plug screw Base frame The level indicator type 400 serves as a liquid indicator in the bypass for reliable level control at boilers and tanks. The indicator features a rectangular flange fitting with two rear fi18 mm holes, which are intended for welding ends to pipe fittings. Alternatively, the level indicator can be welded directly into the tank wall – in this case, the closed back serves as a calming section to minimize level fluctuations in the tank. The fitting is equipped with a sight glass plate made of high-quality borosilicate glass according to DIN 7081. This is securely framed between seals and tightly screwed to ensure lasting tightness and high pressure resistance. Standardly, the sight glass type 400 is made from stainless steel 1.4571 (316Ti) – a material known for its high corrosion resistance and durability. Upon request, the execution is also available in many other materials, suitable for specific requirements and applications. The sealing of the fitting is done with flat seals adapted to your needs from a wide range of materials. This offers not only the common fiber material seals but also more demanding materials, such as PTFE (Teflon®), novaphit® MST-XP, and KlingerSil® C4400. Important note: Reflex sight glasses are not combinable with mica discs and coatings, as the protective mica layer prevents the light refraction necessary for reflection. Cross-sectiondrawing Dimensions BL V S Concealed view h kg 140 79 60 0 25 3,4 170 124 100 0 25 4,0 220 174 150 0 25 5,0 250 204 180 0 25 5,7 300 264 240 0 25 6,7 310 264 240 0 25 7,0 350 304 280 0 25 7,8 370 324 300 0 25 8,2 400 354 330 0 25 8,9 500 454 430 1x46 25 11,4 600 564 540 1x46 25 13,4 620 574 550 1x46 25 13,9 700 654 630 1x46 25 15,7 740 694 670 1x46 25 16,5 800 754 730 1x46 25 17,8 930 884 860 2x46 25 20,9 1000 954 930 3x46 25 22,8  

Screws Cover frame Glass cushion Sight glass Gasket Pipe sockets Base frame The level indicator type 410 serves as a liquid indicator in the bypass for reliable level control on boilers and tanks. The indicator features a square frame with two end face Welding ends of Ø 20 mm. The fitting is equipped with a sight glass made of high-quality borosilicate glass according to DIN 7081. This is securely encased between gaskets and tightly screwed to ensure permanent tightness and high pressure resistance. Standardly, the sight glass type 410 is made of stainless steel 1.4571 (316Ti) – a material characterized by high corrosion resistance and durability. On request, the design is also available in many other materials, suitable for specific requirements and applications. The sealing of the fitting is done with flat gaskets tailored to your needs from an extensive range of materials. This offers not only the commonly used fiber gaskets but also more sophisticated materials such as PTFE (Teflon®), novaphit® MST-XP, and KlingerSil® C4400. Important notice: Reflective sight glasses cannot be combined with mica discs and coatings, as the protective mica layer prevents the necessary light refraction for reflection. Cross-sectiondrawing Dimensions BL V Concealed view h kg 140 79 0 25 3.4 170 124 0 25 4.0 220 174 0 25 5.0 250 204 0 25 5.7 300 264 0 25 6.7 310 264 0 25 7.0 350 304 0 25 7.8 370 324 0 25 8.2 400 354 0 25 8.9 500 454 1x46 25 11.4 600 564 1x46 25 13.4 620 574 1x46 25 13.9 700 654 1x46 25 15.7 740 694 1x46 25 16.5 800 754 1x46 25 17.8 930 884 2x46 25 20.9 1000 954 3x46 25 22.8    

  Type A Type B Type H [bar] [°C] [bar] [°C] [bar] [°C] For soft environment,  not affecting aggressive on the glass ie. oils, hydrocarbons, etc. 400 120 265 120 300 120 150 400 180 400 200 400 0 - 10 430 0 - 10 430 0 - 10 430 For aggressive environment acting on the glass, eg. saturated steam, hot water, alkalis 35 243 35 243 42 253     Dimensions: Size TYPE A TYPE B TYPE H L W H L W H L W H 0 95 30 17 95 34 17 - - - I 115 30 17 115 34 17 115 34 22 II 140 30 17 140 34 17 140 34 22 III 165 30 17 165 34 17 165 34 22 IV 190 30 17 190 34 17 190 34 22 V 220 30 17 220 34 17 220 34 22 VI 250 30 17 250 34 17 250 34 22 VII 280 30 17 280 34 17 280 34 22 VIII 320 30 17 320 34 17 320 34 22 IX 340 30 17 340 34 17 340 34 22 X - - - 370 34 17 - - -   Reflex level gauge glasses offered by us are made by a recognized, global companies like Klinger, Maxos, Spectraglass of high-quality borosilicate("extra hard") or aluminosilicate glasses. Glass in the production process is subjected to a polishing and toughening. This results in products characterized by high mechanical strength and high resistance to alkalis, acids and condensates. In the production process is conducted constant and precise control of transparency and the dimensions of manufactured glass. Reflex gauge glasses  are used to read the liquid level directly or with the use of CCTV (industrial television). In this type of glass on the chamber side (medium side) are imprinted longitudinal grooves (3 or 4), which walls are angled to each other at an angle of 90˚. Squeezing process causes the formation of grooves. On the surface of the grooves creates extremely smooth and hard glass layer, very resistant to the environment. With the grooving increases the angle of refraction which makes the visibility of the liquid level is much better than when using smooth glass. For reflective glass does not apply mica shields. Reflex glasses may be used in pressure up to 35 bar. In this area are sufficiently resistant to the environment. The reading is clear and contrast. In the case of factors other than steam reflex glasses may be used up to 400 bar or 400˚C. Depending on the width and thickness there are three basic types of transparent level gauge glasses: type A - width 30 mm, thickness 17 mm type B - width 34 mm, thickness 17 mm type H - width 34 mm, thickness 22 mm In addition, the occasionally encountered also: Type C - width of 20 mm, thickness 12 mm Type D - width 25 mm, thickness 15 mm Reflex level gauge glasses are supplied in sets with gaskets or separately. We offer transparent glass meet the following standards: ÖNORM M 7354 (Austrian standard) DIN 7081 (German standard) JIS B 8211 (Japanese standard) ÖMV-Spez. H 2009 (factory standard of the Austrian petrochemical concern ÖMV-AG, Vienna) MIL-G-16356 D (regulations the US Navy) Esso Eng. Spec. 123 (Esso Research and Engineering Co. - New Jersey) S.O.D. Spec. 123 (Standard Oil Development Company - New Jersey) BS 3463 (British Standard) Note: transparent level gauge glasses are supplied in sets with gaskets or separately. If you can not find the size - please contact us.   While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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.