Flow sight glass type 531 PN 10/63

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.

Flow sight glass for operating pressures up to 63 barg with flange connections according to DIN EN 1092-1. The flow sight glass type 530 as a welded construction is a particularly robust version of our flow sight glasses. Type 530 is designed for operating pressures up to 63 barg and can be easily installed between flanges according to DIN EN 1092-1. Thanks to its standard lengths according to DIN EN 558-1, the sight glass is ideally suited for subsequent installation in existing systems. Even with larger nominal sizes, operating pressures of up to 63 barg and more can be achieved with type 530. The standard version with borosilicate glass is suitable for operating temperatures up to 280 °C, with an additional mica protection disc even 300 °C or 320 °C in combination with MAXOS® safety sight glasses according to DIN 7080. The sealing of the fitting is done with flat gaskets tailored to your needs from a wide range of materials. This offers not only the common fiber material gaskets but also more demanding materials such as PTFE (Teflon®), NBR, novaphit® MST-XP, KlingerSil® C4400, and many other branded seals. Cross-sectiondrawing Dimensions PN DN BL³ D1³ AL³ 10 25 160 22 284 40 200 35 261 50 230 45 262 80 310 55 337 100 350 84 372 125 400 107 422 150 480 132 462 200 600 160 570 250 730 160 641 300 850 160 693 350 980 160 741 400 1100 160 792 16 25 160 22 285 40 200 35 260 50 230 45 260 80 310 55 340 100 350 84 380 125 400 107 420 150 480 132 470 200 600 160 580 250 730 160 650 300 850 160 700 350 980 160 750 400 1100 160 800 25 25 160 22 284 40 200 35 261 50 230 45 272 80 310 55 347 100 350 84 392 125 400 107 432 150 480 132 482 200 600 160 610 250 730 160 681 300 850 160 733 350 980 160 781 400 1100 160 832   PN DN BL³ D1³ AL³ 40 25 160 22 284 40 200 35 271 50 230 45 272 80 310 55 357 100⁴ 350 84 402 125⁴ 400 107 452 150⁴ 480 132 502 200⁴ 600 160 610 250⁴ 730 160 681 300⁴ 850 160 733 350⁴ 980 160 781 400⁴ 1100 160 832 63 25 160 22 306 40 200 35 349 50 230 45 352 80 310 55 417 100⁴ 350 84 448 125⁴ 400 107 500 150⁴ 480 132 598 200⁴ 600 160 696 250⁴ 730 160 767 300⁴ 850 160 867 350⁴ 980 160 819 400⁴ 1100 160 918 3) All measurements will be executed according to standard as far as constructively possible. Otherwise, the details from the order confirmation and customer drawing apply.4) Departing from the printing temperature limits according to DIN EN 1092-1.

Rotor plastic (120°C) or PTFE: A liquid flow is indicated through rotation of the rotor. As a result, flow control is much easier and quicker to detect. Flap made of 1.4571: A liquid flow is indicated by opening and moving the flap. In this way it is easier and quicker to check the flow rate. Vacuum version with O-ring: In this case of vacuum, there is a risk whereby the gasket can be pulled inwards and the external medium can enter the valve. For medium vacuum, a PTFE seal should be used, for higher vacuum, or O-ring seal made of Viton is required. Double glazing: Double glazing ensures additional safety in case of damage to inner glass. The additional glass prevents distribution of medium and possible glass splinters in case of damage or even destruction of the inner glass.     The ACI flow sight glass type 550 is a robust sight glass for industrial applications. The body is made of high-quality stainless steel casting 1.4408, which ensures excellent corrosion resistance as well as high mechanical strength. The design is intended for installation between DIN EN 1092-1 flanges and allows the visual monitoring of media in pipelines under working pressure. The type 550 is manufactured in accordance with DIN 11869 (formerly DIN 3237). Upon request, versions in other materials and alloys are also available, e.g., 1.0619 (cast steel) or Alloy C22, according to your specification. Flange connections:As standard, the sight glass is supplied with flanges according to DIN EN 1092-1 PN 10/16/25/40.  Gasket system:The gasket is achieved via proven flat gaskets from leading manufacturers, including: Frenzelit novaphit® MST XPKlingerSil® C4400Garlock Gylon®PTFE (pure or modified)Over 50 other gasket materials available upon requestOptional protective coatings for the sight glass:For increased thermal and chemical loads, the sight glasses can be equipped with the following protective layers: HALAR® coatingFEP coatingMica protection disc Additional equipment (factory-integratable): Sight glass wiper type SGW (with wiping blades made of PTFE, silicone, or EPDM)Spraying devices for cleaningLED lights, also available with ATEX certification for explosion-prone areas upon request Cross-sectiondrawing Dimensions <tr"> </tr"> DN 15 20 25 32 40 50 65 80 100 1251 1501 2001 D (PN16) 95 105 115 140 150 165 185 200 220 250 285 340 D (PN25) 95 105 115 140 150 165 185 200 235 270 300 360 D (PN40) 95 105 115 140 150 165 185 200 235 270 300 375 BL 130 150 160 180 200 230 290 310 350 400 480 600 D1 32 32 48 48 65 80 80 100 125 150 175 175 1) According to DIN 11869  

Cross-sectiondrawing Dimensions Dimensions: Size     3 4 5 6 7 8 9 10 11 12 13 Nominal width  DN   50 80 100 125 150 200 250 300 350 400 500 Glass Ø  D [mm]    100 125 150 175 200 250 300 upon request Clear view  d1 [mm]    80 100 125 150 175 225 280 Wiping circle Ø  d2 [mm]    75 95 120 145 170 220 275 Glass thickness  S [mm]  Operating pressure max. PS [barü] Height  H [mm]                    116 15 8 5 4 3 2 / / 111 20 12 8 5 5 4 2 1 106 25 20 12 8 8 5 4 2 121 30 25⁴ 20 12 12 8 5 3 116 35 / 25⁴  21 15 11 7 4 111 40 / / 25⁴  20 14 9 6 106 45 / / / 25⁴  18⁴  11 7 111 55 ³   3) 55 mm on request4) higher pressures on request The sight glass wipers of type SGW are designed for the on-demand manual cleaning of glass plates in round sight glass fittings. They are suitable for applications under pressure and can also be easily retrofitted into existing sight glass fittings. Made of high-quality stainless steel, the wipers also meet the requirements in the food and drinking water sector. Various materials are available for the wiper blade: PTFE, silicone, or EPDM. The sight glass wipers are particularly effective in combination with the spray device SVI or SVIII.