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The Borosilicate 4.2 Glass Sheet represents a pinnacle of thermal engineering, specifically designed for environments where standard soda-lime glass fails. As a premier manufacturer and global supplier, we provide this specialized material characterized by its unique $4.2 \times 10^{-6}/K$ coefficient of linear thermal expansion. This specific formulation bridges the gap between standard laboratory glass and high-performance industrial ceramics, offering exceptional clarity, superior chemical resistance, and the ability to withstand significant thermal gradients without structural compromise. It is the ideal medium for precision instrumentation and heavy-duty industrial viewing ports.
The manufacturing process of our Borosilicate 4.2 Glass Sheet involves a high-precision float or rolling method that ensures an ultra-smooth surface finish and exceptional internal homogeneity. Unlike traditional glass, this material is infused with significant concentrations of boron trioxide and silica, which creates a robust molecular matrix. This structure is the foundation of its remarkable physical properties, allowing the glass to remain stable and clear even when exposed to corrosive acids or fluctuating temperatures that would typically cause leaching or clouding in inferior materials.
In practical application, the glass exhibits a neutral color profile, ensuring that light transmission remains high across the visible spectrum. This makes it indispensable for optical monitoring in chemical reactors and high-pressure boilers. The tactile surface is non-porous and incredibly hard, resisting scratches and environmental degradation over long-term deployments. By choosing this specific borosilicate grade, engineers gain a reliable component that reduces the frequency of maintenance shutdowns and enhances the safety margins of complex mechanical systems.
| Property Parameter | Value / Data |
| Material Grade | Borosilicate 4.2 (Technical Grade) |
| Coefficient of Thermal Expansion (CTE) | $4.2 \times 10^{-6}/K$ (at 20-300°C) |
| Density | $2.29 - 2.35 g/cm^3$ |
| Annealing Point | $560°C \pm 10°C$ |
| Softening Point | $820°C \pm 10°C$ |
| Light Transmission | $\geq 91\%$ (at 5mm thickness) |
| Refractive Index | $1.474$ |
| Modulus of Elasticity | $64 \times 10^3 N/mm^2$ |
| Hydrolytic Resistance | Class 1 (ISO 719) |
| Acid Resistance | Class 1 (DIN 12116) |
| Alkali Resistance | Class 2 (ISO 695) |
The Borosilicate 4.2 Glass Sheet is defined by a suite of performance characteristics that ensure longevity and precision in demanding scenarios:
Precise Thermal Expansion: The $4.2$ expansion coefficient provides a specialized middle ground for thermal stability, making it compatible with specific metal sealing alloys and precision housings.
Superior Thermal Shock Resistance: This glass can withstand rapid temperature changes, allowing for safe operation in environments with extreme heating and cooling cycles.
Exceptional Optical Purity: With light transmission exceeding 90%, it provides crystal-clear visibility for monitoring internal processes without distortion or color shift.
Chemical Inertness: The surface is virtually immune to water, neutral and acidic solutions, and concentrated acids, preventing contamination of sensitive chemical batches.
Mechanical Integrity: It maintains a high elastic modulus and surface hardness, resisting deformation under pressure and minimizing wear in abrasive environments.
Workability: The material is highly responsive to CNC machining, water-jet cutting, and edge polishing, allowing for complex geometries and tight tolerances.
The integrity of our technical glass is rooted in its chemical blueprint. By carefully balancing the silica ($SiO_2$) and boric oxide ($B_2O_3$) content, we achieve a material that is significantly more durable than conventional glass.
Low Alkali Content: Reduced sodium and potassium levels minimize the expansion and contraction of the glass lattice, which is the primary cause of thermal fracture.
Boron Trioxide Matrix: The presence of boron creates a dense, interconnected structure that enhances the material's resistance to chemical attack and high temperatures.
Purity Standards: We utilize high-purity raw materials to ensure there are no bubbles, inclusions, or striations that could act as stress concentrators during use.
Long-term Stability: Unlike plastics or inferior resins, this glass does not yellow, degrade, or release volatile organic compounds (VOCs) when exposed to UV light or heat.
The Borosilicate 4.2 Glass Sheet serves as a critical component across a diverse range of high-stakes industries, where failure is not an option.
Process Engineering: Utilized as sight glasses for pressure vessels, chemical tanks, and pipelines where visibility and chemical resistance are paramount.
Laboratory Technology: Ideal for high-performance labware, distillation components, and reaction vessels that require autoclave sterilization.
Aviation & Aerospace: Employed in specialized lighting covers and sensor protection windows that must endure extreme atmospheric temperature shifts.
Household Appliances: Used in high-end oven doors and microwave trays where heat resistance and ease of cleaning are required.
Semiconductor Manufacturing: Acts as a stable substrate for thin-film deposition and as protective shielding in cleanroom environments.
Our facility utilizes advanced fabrication technologies to transform raw borosilicate sheets into mission-ready components tailored to your exact project requirements.
CNC Profile Grinding: We offer high-precision edge grinding, including chamfering, beveling, and radius edges to ensure safe handling and a perfect fit in metal gaskets.
Surface Finishing: Options include mechanical polishing for high-transparency requirements or sandblasting/acid-etching for diffused lighting applications.
Thermal Toughening: For applications requiring even higher mechanical strength, we can temper the glass to increase its impact resistance and safety profile.
Silk-Screen Printing: High-temperature ceramic inks can be applied for logos, measurement scales, or decorative borders that will not fade or peel.
Custom Geometric Cutting: Our water-jet and laser cutting systems allow for complex internal holes, notches, and non-linear shapes with micron-level accuracy.
Partnering with an experienced manufacturer ensures that your material procurement is backed by technical expertise and rigorous quality assurance protocols.
Proven Expertise: With decades of experience in the glass industry, we provide technical consultation to help you select the exact glass grade for your thermal and mechanical loads.
Quality Management: Every sheet undergoes strict inspection for surface quality, dimensional accuracy, and internal stress according to international standards.
Supply Chain Reliability: We maintain a robust inventory of standard thicknesses, allowing for rapid turnaround on both large-scale production runs and small custom prototypes.
Engineering Support: Our team provides detailed technical data sheets and CAD compatibility to assist your design engineers in the early stages of product development.
Global Logistics: We utilize specialized protective packaging and seasoned logistics partners to ensure that your glass arrives safely and intact at your facility, regardless of location.
The primary difference lies in the coefficient of thermal expansion. While 3.3 is the standard for laboratory glassware with maximum thermal shock resistance, 4.2 offers a slightly different expansion profile that is often better suited for specific sealing applications with certain metals and alloys while still maintaining high thermal performance.
Yes, it is designed for high-temperature use. It can safely operate at continuous temperatures up to approximately 450°C, and can withstand short-term peaks near its annealing point of 560°C, provided the thermal gradient is managed correctly.
Like almost all silicate glasses, borosilicate is susceptible to hydrofluoric acid and concentrated phosphoric acid at high temperatures. However, it offers world-class resistance to almost all other organic and inorganic acids, as well as salt solutions and neutral chemicals.
We employ industrial-grade crating solutions, including shock-absorbent layering, reinforced wooden cases, and vacuum sealing when necessary. Our packaging is designed to exceed international shipping standards for fragile industrial components.
Absolutely. We utilize advanced 5-axis CNC machines and water-jet technology to create precise internal cutouts, mounting holes, and complex exterior profiles based on your specific technical drawings.
