Transparent Flat Gauge Glass

1. Materials

Our transparent flat gauge glasses are manufactured from two premium glass types:

• Borosilicate glass — excellent thermal and chemical resistance; durable under high temperature and corrosive conditions. (Typical composition: ≥5% boric oxide.)

• Aluminosilicate glass — high hardness and scratch resistance; better resistance to mechanical impact and abrasion.

Both materials provide superior optical clarity, enabling clear and reliable visual monitoring of liquid levels under varied lighting and media.

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2. Key Features

• Strip (flat) profile — optimized for sight gauges, boilers and equipment where a clear, linear view of liquid level is required.

• Double-sided polish — smooth faces on both sides for unobstructed visibility.

• High durability — material choices and surface finishing give long service life in industrial environments.

• Wide applicability — suitable for high temperature, corrosive media, abrasive or impact-prone environments (material dependent).

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3. Surface Treatment

• For optimal transparency and safety we grind and polish both faces and the side edges.

• Typical process (sheet-based): start from a high-borosilicate sheet (17 mm nominal thickness), cut to size, then precision-polish faces and sides to remove burrs and prevent handling injuries.

• Surface treatment ensures consistent optical quality and safer installation.

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4. Manufacturing Processes

We employ two primary manufacturing techniques:

A. Mold-Based Manufacturing

• Semi-finished parts are formed in molds (similar to transparent flat gauge glasses processes).

• After forming, both faces are ground and polished to improve clarity.

• Advantage: simpler production flow.

• Limitation: optical clarity may be lower than sheet-based method.

B. Sheet-Based Manufacturing (Premium)

• Begin with a 17 mm high-borosilicate sheet, cut to exact dimensions, then grind and polish faces and side edges.

• Produces superior transparency and visual clarity — preferred where viewing clarity is critical.

• Higher material and processing cost compared to mold-based technique.

All production follows strict quality standards to meet industrial performance expectations.

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5. Applications

Typical application areas include, but are not limited to:

• Industry pipe sight windows — monitor flow and liquid levels in process piping.

• High-temperature / chemical environments — laboratory equipment, chemical processing units, industrial boilers (borosilicate recommended).

• High-impact / abrasive environments — heavy machinery, oil & gas equipment (aluminosilicate recommended).

• General industrial monitoring — any installation requiring clear, durable sight glass.

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6. Technical Specifications

6.1 Borosilicate Transparent Flat Gauge Glass (extra-hard)

• Material: Extra-hard borosilicate glass (≥5% boric oxide).

• Transmissivity (visible light): > 90%

• Thermal shock resistance (approx.): ≥ 160 °C

• Softening temperature: ≈ 820 °C

• Bending strength: ≈ 69 MPa

• Working temperature: up to ≈ 450 °C (depends on formulation)

• Working pressure: depends on thickness and geometry; suitable for high-pressure applications (commonly can withstand tens of bars; verify per application).

6.2 Aluminosilicate Transparent Flat Gauge Glass

• Material: Aluminosilicate glass (high hardness).

• Form: strip (flat).

• Transmissivity: ~91.8%

• Shock temperature: ≤ 370 °C

• Softening temperature: ≥ 920 °C

• Bending strength: 180–220 MPa

• Working temperature: up to 600 °C

• Working pressure: up to 200 MPa (application dependent)

Technical notes

• Non-standard aluminosilicate thicknesses and sizes can be custom manufactured on request.

• All performance figures are typical values — confirm specific ratings for critical applications.

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7. Standard Sizes (typical examples, all dimensions in mm)

All sizes are customizable to client requirements.

Type A (standard example)

Type B (wider example)

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8. Advantages / Competitive Points

1. Clear visibility — double-sided polishing and high transmittance ensure precise readings.

2. Environmental resistance — aluminosilicate variants maintain clarity and hardness in aggressive / abrasive conditions.

3. Wide service range — available options to suit low-to-high pressure and low-to-high temperature operations (depending on material and thickness).

4. Customizable — sizes and thicknesses can be tailored to customer specifications.

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9. Ordering & Customization Notes

• Provide intended operating temperature, pressure, media type, and required dimensions when requesting a quotation.

• For safety-critical or high-pressure applications, request material certificates and mechanical/pressure test reports.

• Lead time and cost vary with material choice (sheet-based aluminosilicate parts typically cost more due to material and processing).