Custom High Borosilicate 3.3 Glass Panels & Discs
Continuous Heat Resistance up to 500°C | Extreme Thermal Shock Resistance (Delta T 150°C – 200°C) | Precision CNC Safety Chamfered Edges | Thicknesses from 0.2mm to 20mm
1. Product Overview & Engineering Highlights
Our Custom High Borosilicate Glass Panels and Discs (Borosilicate 3.3 / Pyrex Grade) are engineered for demanding environments such as industrial sight glasses, chemical reactor observation viewports, high-power LED luminaire covers, laboratory thermal platforms, and home appliance front panels.
Composed of high-purity silica (SiO2 ~81%) and boron oxide (B2O3 ~13%), Borosilicate 3.3 glass features an ultra-low coefficient of thermal expansion (~3.25 x 10^-6 / K), providing high thermal shock resistance, hydrolytic resistance, and over 91.0% optical transmittance across the visible and near-infrared spectra.
All panels and circular discs are custom-machined to tight tolerances based on 2D/3D CAD drawings (DXF, DWG, STEP, PDF) and finished with precision CNC safety edge grinding (safety arris, flat polished edges, or 2.5D round bevels) to eliminate sharp burrs and microscopic edge flaws.
2. Core Advantages & Thermal Performance
Continuous High Operating Temperature: Operates continuously at temperatures up to 450°C – 500°C, with short-term heat resistance reaching 550°C (softening point around 820°C).
High Thermal Shock Resistance (Delta T): Withstands sudden temperature differentials of Delta T >= 150°C – 200°C without cracking or fracturing under rapid heating and cooling cycles.
Low Thermal Expansion (CTE): A low expansion rate (~3.25 x 10^-6 / K) ensures structural stability under extreme thermal gradients.
High Chemical Inertness: Hydrolytic Class 1 (ISO 719) and Acid Class 1 (ISO 195) durability, resisting chemical corrosion from acids, saline solutions, and organic solvents.
CNC Ground Safety Edges: Chamfered safety bevels (45° arris, flat polished, or pencil edges) prevent stress concentration and protect operators during assembly.
3. Technical Specifications Table
| Parameter / Property | Technical Specification & Standard Options |
| Product Name | Custom High Borosilicate Glass Panels & Discs (Borosilicate 3.3) |
| Material Grade | High Borosilicate 3.3 / Pyrex Grade / D263 / BF33 |
| Chemical Composition | SiO2 (~81%) + B2O3 (~13%) + Na2O/Al2O3 |
| Available Thickness Range | 0.2 mm, 0.5 mm, 0.7 mm, 1.1 mm, 1.6 mm, 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm up to 20.0 mm |
| Continuous Operating Temperature | Up to 450°C – 500°C |
| Short-Term Maximum Temperature | Up to 550°C (Softening point ~820°C) |
| Thermal Shock Resistance (Delta T) | Delta T >= 150°C – 200°C (Rapid heating/quenching without fracture) |
| Coefficient of Thermal Expansion (CTE) | ~3.25 x 10^-6 / K (20°C – 300°C) |
| Optical Transmittance | >= 91.0% – 92.0% (@ 350 nm – 2500 nm Visible/Near-IR spectrum) |
| Dimensional Tolerance | +/- 0.05 mm to +/- 0.1 mm (High-speed CNC milling / Laser dicing) |
| Thickness Tolerance | +/- 0.02 mm to +/- 0.05 mm |
| Edge & Safety Processing | CNC Safety Arris (45° micro-chamfer), Flat Polished Edge, 2.5D C-Edge / R-Edge |
| Surface Quality | 60/40 (Commercial Optical), 40/20 (Precision Optical Grade) |
| Secondary Fabrication Options | Step-milled border (rabbeted edge), waterjet hole drilling, silk screen printing, AR coating |
4. Typical Applications & Industry Use Cases
Industrial Sight Glasses & Viewports: Fluid level gauges, boiler inspection windows, pipeline sight indicators, and chemical reactor observation ports.
High-Power LED & Stage Lighting: Protective front cover lenses for high-wattage COB floodlights, architectural luminaires, stage spotlights, and explosion-proof lighting fixtures.
Laboratory & Scientific Research: Heated microscope stage plates, electrochemical bath windows, thermal analysis viewports, and custom laboratory slide substrates.
Commercial Appliances & Furnaces: Oven door viewports, fireplace protection glass, indoor heater window panels, and commercial induction cooktop covers.
Optical & Photonic Substrates: Anti-reflective optical filter substrates, UV/Vis spectroscopic windows, and high-temperature protective debris shields.
5. Frequently Asked Questions (FAQ)
Q1: How does Borosilicate 3.3 glass differ from standard Soda-Lime float glass?
A: Borosilicate 3.3 contains approximately 13% boron oxide, lowering its thermal expansion coefficient to roughly one-third that of soda-lime glass (~3.25 x 10^-6 / K vs. ~9.0 x 10^-6 / K). This allows borosilicate glass to endure continuous operating temperatures up to 450°C – 500°C and drastic thermal shocks (Delta T >= 150°C), whereas standard float glass fractures under similar thermal swings.
Q2: What is a “Safety Edge” and why is it important for borosilicate glass?
A: A safety edge (such as a 45° CNC chamfer/arris or 2.5D round bevel) removes microscopic cracks, chips, and sharp burrs left after cutting. This reduces localized mechanical stress concentrations, increases the edge impact strength of the glass, and prevents cut injuries during manual handling and assembly.
Q3: Can Borosilicate 3.3 glass be chemically or thermally tempered?
A: Because of its low thermal expansion coefficient, standard physical thermal tempering is less common for thin borosilicate glass. However, borosilicate glass can undergo specialized thermal toughening for heavy-duty sight glasses (thickness >= 4.0mm) or precision chemical strengthening for specialized optical applications.
Q4: Can you produce custom shapes, holes, and stepped edges?
A: Yes. We manufacture from customer 2D and 3D CAD files (DXF, DWG, STEP, PDF). Capabilities include CNC step-edge milling (rabbeted borders) for waterproof gasket seating, waterjet through-holes for mounting screws, and irregular contour profiles.
Q5: What is the lead time for prototypes and production orders?
A: Custom prototypes and evaluation samples are delivered in 7 to 10 working days. Mass production typically takes 12 to 18 working days depending on geometric complexity and quantity.
6. Cleanroom Packaging & Export Protection
Multi-Stage Ultrasonic Cleaning: Washed with deionized water in cleanroom environments to remove cutting fluids and abrasive dust.
Scratch-Proof Interleaving: Protected with residue-free optical protective PE film or acid-free lens paper between adjacent panels.
Shock-Absorbent Packaging: Packed into custom high-density foam slotted trays, sealed in moisture-proof packaging, and boxed in reinforced export crates for damage-free delivery worldwide.
Need a Custom Borosilicate Glass Solution for Your Application?
Upload your CAD drawing or specify your dimensions, thickness (0.2mm–20mm), operating temperature, and edge finishing requirements. Our engineering team will review your specifications and provide a quotation within 24 hours.
[ Request a Custom Quote / Sample ] [ Download Material Datasheet ]
