⭐ Trusted Transparent Level Gauge Glass Manufacturer

High-Clarity Transparent Level Gauge Glass for Viscous, Interface & Coloured Liquids

Premium tempered borosilicate transparent gauge glass with finely ground and polished surfaces on both sides for optimal transparency. Designed for direct, unambiguous observation of liquid level, colour, and interface in demanding process conditions. Suitable for steam service up to 120 bar with mica shield protection. Manufactured to DIN 7080/7081, BS 3463, JIS B 8211, MIL-G-16356D, and Ö-Norm M 7354 standards.

DIN 7081 / BS 3463 / JIS B 8211 Tempered Borosilicate 3.3 Type A, B, H & TA-28
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Transparent Level Gauge Glass - Tempered Borosilicate with Polished Surfaces
Premium Transparent Gauge Glass DIN 7081 • BS 3463 • Up to 400°C / 340 bar
120 bar Steam with Mica Shield
340 bar Non-Steam Rated
🔬 Tempered Borosilicate 3.3
✅ DIN 7081 Certified
🔥 Up to 400°C
📏 Type A, B, H & TA-28
🌎 Worldwide Supply

Reflex Gauge Glass Types

Type A and Type B Reflex Gauge Glass — Standard Sizes & Applications

Transparent Level Gauge Glass Technical Specifications

Manufactured from thermally pre-stressed borosilicate glass 3.3 with both surfaces finely ground and polished to ensure optimal transparency and clear observation of fluid properties.

📋 Product Parameters

Material Tempered Borosilicate Glass 3.3 / Aluminosilicate (on request)
Coefficient of Linear Expansion 3.3 ± 0.1 × 10⁻⁶ K⁻¹ (20–300°C), tested per DIN 52328
Softening Point 820 ± 10°C
Bending Strength ≥ 120 N/mm² (standard); ≥ 150 N/mm² typical
Water Resistance Hydraulic class 1, tested per DIN 12111
Acid Resistance Acid class 1, tested per DIN 12116
Alkali Resistance Leach class 2, tested per DIN 52322
Surface Finish Fine ground and polished on both sides

🔬 Performance & Standards

Steam Service (with Mica Shield) Above 22 bar and up to 120 bar
Steam Service (without Mica) Up to 35 bar saturated steam
Max Pressure (Non-Steam) Up to 340 bar
Max Temperature Up to 400°C (non-steam)
Pressure Rating Up to ANSI 1500 (250 bar)
Temperature Range −196°C to +400°C
International Standards DIN 7080 / 7081, BS 3463, JIS B 8211, MIL-G-16356D, Ö-Norm M 7354, Auer USA Specification

💡 Mica Shield Protection

For steam service above 35 bar and for media with high pH value, transparent gauge glass must be protected by a mica shield on the side facing the medium chamber. Mica shields significantly extend the service life of sight glasses in high-pressure and high-temperature steam applications. They are mandatory where steam pressure exceeds 40 bar and temperature exceeds 200°C.

Standard Size Chart (Type A, B, H & TA-28)

Transparent gauge glass is available in standard sizes I through IX, with custom lengths and widths available upon request. All dimensions in mm.

Size No. Length (mm) Type A (W×T) Type B (W×T) Type H (W×T) Type TA-28 (W×T)
I 115 30 × 17 34 × 17 — 27.6 × 16.8
II 140 30 × 17 34 × 17 34 × 22 —
III 165 30 × 17 34 × 17 34 × 22 27.6 × 16.8
IV 190 30 × 17 34 × 17 34 × 22 27.6 × 16.8
V 220 30 × 17 34 × 17 34 × 22 27.6 × 16.8
VI 250 30 × 17 34 × 17 34 × 22 27.6 × 16.8
VII 280 30 × 17 34 × 17 34 × 22 27.6 × 16.8
VIII 320 30 × 17 34 × 17 34 × 22 27.6 × 16.8
IX 340 30 × 17 34 × 17 34 × 22 27.6 × 16.8

Why Choose Our Transparent Gauge Glass

Precision-engineered transparent glass delivering superior optical clarity, mechanical strength, and reliable performance in demanding industrial applications.

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Direct, Unobstructed View

Clear and smooth on both sides, providing an unobstructed view of the liquid level while enabling inspection of fluid colour, viscosity, and interface between two liquids.

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Mica Shield Protection

For steam service above 35 bar and media with high pH, transparent glass can be protected by a mica shield on the medium-facing side, significantly extending service life in high-pressure steam applications.

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High Temperature Performance

Withstands continuous temperatures up to 400°C for non-steam applications. The glass maintains structural integrity and optical clarity under thermal cycling.

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Excellent Chemical Resistance

Acid class 1 and alkali class 2 per DIN standards. Resistant to most industrial chemicals, acids, and alkalis. Ideal for contaminated, viscous, or corrosive media.

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Precision Polished Surfaces

Both sides finely ground and polished for optimal transparency. Parallelism tolerance ≤ 0.13mm for standard level gauge glasses, ensuring reliable optical performance.

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International Standards

Manufactured to DIN 7081, BS 3463, JIS B 8211, MIL-G-16356D, and Ö-Norm M 7354. Complete traceability and material certifications available.

Transparent Gauge Glass Applications

Specifically designed for applications involving viscous, interface, or coloured liquids where visibility of fluid characteristics is essential.

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Steam Boilers

Suitable for steam service above 22 bar and up to 120 bar with mica shield. Direct water level indication in boiler drums and feedwater heaters.

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Interface Level Measurement

Ideal for observing the interface between two immiscible liquids of different densities. Selected for interface level indication in separators.

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Coloured & Viscous Liquids

Direct observation of fluid colour, viscosity, and clarity. Recommended for contaminated or corrosive media where visual inspection is critical.

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Chemical Processing

Non-steam applications up to 340 bar and 400°C. Resistant to most chemicals, acids, and alkalis in process vessels and tanks.

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Power Generation

Boiler drum level monitoring, feedwater heaters, and other vessel level indication in conventional and combined cycle HRSG plants.

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Process Industries

Pulp & paper, petrochemical, pharmaceutical, and food processing level gauges where fluid properties must be visually verified.

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Marine & Offshore

Boiler water level indication and tank monitoring in marine environments. Suitable for indoor or outdoor installation.

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OEM Level Gauge Manufacturing

Supplied to leading gauge manufacturers including Jerguson, Penberthy, Klinger, Bonetti, and Nihon Klingage.

Why Choose Our Transparent Gauge Glass

A reliable manufacturing partner providing certified transparent gauge glass to global industrial customers.

Transparent Gauge Glass Manufacturing Facility
  • ✓ Certified to International Standards — Manufactured in accordance with DIN 7081, BS 3463, JIS B 8211, MIL-G-16356D, and Ö-Norm M 7354 specifications.
  • ✓ Premium Borosilicate 3.3 Material — High-purity tempered borosilicate glass with low thermal expansion (3.3 × 10⁻⁶ K⁻¹) and excellent chemical resistance.
  • ✓ Precision Polished Surfaces — Both sides finely ground and polished to ensure optimal transparency and clear observation of fluid properties.
  • ✓ Full Size Range Available — Standard sizes I–IX in Type A (30×17), Type B (34×17), Type H (34×22), and TA-28 (27.6×16.8). Custom sizes on request.
  • ✓ Strict Quality Inspection — Every glass undergoes dimensional inspection, visual examination, parallelism check, and pressure testing.
  • ✓ Global Export Experience — Professional packaging with protective materials and full documentation for international delivery.

International Standards & Compliance

Our transparent gauge glass is manufactured and certified to meet the most stringent international specifications.

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DIN 7080 / 7081

German Standard for Gauge Glass

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BS 3463

British Standard for Observation & Gauge Glasses

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JIS B 8211

Japanese Industrial Standard for Boiler Gauge Glasses

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MIL-G-16356D

US Military Specification for Boiler Water Gauges

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Ö-Norm M 7354

Austrian Standard for Long Gauge Glasses

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ISO 9001:2015

Quality Management System

Frequently Asked Questions

Common questions about transparent level gauge glass selection, installation, and applications.

What is the difference between reflex and transparent gauge glass? +
Reflex gauge glass has prismatic grooves that create a high-contrast level indication (dark for liquid, bright for vapor), while transparent gauge glass is clear and smooth on both sides, allowing a direct, unobstructed view of the fluid. Transparent glass is preferred for viscous, interface, or coloured liquids where fluid properties need to be visually inspected. It is also the only type that can be protected with mica shields for high-pressure steam service above 35 bar.
Why is mica shield protection mandatory for transparent gauge glass? +
Mica shields are mandatory where saturated steam pressure exceeds 40 bar and temperature exceeds 200°C. They protect the glass from the corrosive action of boiler water and condensate, which causes silica to be leached from the glass surface. Mica shields significantly extend the service life of transparent gauge glass and are required for steam service above 35 bar.
What are the different types of transparent gauge glass available? +
There are four standard types: Type A (width 30mm, thickness 17mm), Type B (width 34mm, thickness 17mm), Type H (width 34mm, thickness 22mm), and Type TA-28 (width 27.6mm, thickness 16.8mm). Type A is the standard width for most general-purpose gauges. Type B offers a wider viewing area. Type H provides greater thickness for higher pressure applications. TA-28 is used in specific gauge models.
What is the maximum operating pressure and temperature? +
For steam service, transparent gauge glass is rated up to 120 bar with mica shield protection and up to 35 bar without mica. For non-steam applications, it can handle pressures up to 340 bar and temperatures up to 400°C. The specific rating depends on the glass dimensions, gasket material, and gauge assembly design.
Can you supply custom sizes? +
Yes. While standard sizes I–IX cover lengths from 115mm to 340mm, we can manufacture custom lengths, widths, and thicknesses to match your existing gauge assembly. Please provide the required dimensions, maximum operating temperature and pressure, and any specific standard requirements for a quotation.
What standards does your transparent gauge glass meet? +
Our transparent gauge glass is manufactured in accordance with DIN 7080 / 7081 (German), BS 3463 (British), JIS B 8211 (Japanese), MIL-G-16356D (US Military), and Ö-Norm M 7354 (Austrian) standards. Aluminosilicate glass is also available on request for higher temperature applications.
How should transparent gauge glass be installed and maintained? +
Always use new gaskets when installing gauge glass. The glass must be centered in the fitting to avoid glass-metal contact. Tighten cover bolts gradually in a cross-pattern sequence, starting from the middle. Never reuse a gauge glass that has been exposed to process conditions. Inspect regularly for chips, cracks, or clouding, and replace immediately if any damage is found. For steam service with mica shields, inspect the mica for damage during each maintenance cycle.

Get Your Transparent Gauge Glass Quote Today

Tell us your specifications and application requirements. Our engineers will provide a suitable transparent gauge glass solution with full certifications.

  • Factory direct quotation
  • DIN 7081 / BS 3463 certified
  • Type A, B, H & TA-28 standard sizes in stock
  • Custom sizes and OEM support

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