# Borosilicate Float Glass Heat Resistant Plate Wafer for Sight Glass

> Borosilicate Float Glass Heat Resistant Plate Wafer for Sight Glass — a fused silica / quartz wafer: Borosilicate 3.3 (Borofloat type), low thermal…

- Page: https://machiningglass.com/products/borosilicate-float-glass-heat-resistant-plate-wafer-for-sight-glass/
- SKU: MG-5D5960
- Category: Glass & Quartz Wafers > Fused Silica & Quartz Wafers
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Borosilicate-Float-Glass-Heat-Resistant-Plate-Wafer-for-Sight-Glass.webp
- Updated: 2026-10-24

Product type: Borosilicate Glass. Application: Door, Window, Heat Resistant Glass. Model: 80413. Function: Optical Function, Electromagnetic Function, Thermal Function, Biological and Chemical Function.

## Overview

Borosilicate Float Glass Heat Resistant Plate Wafer for Sight Glass: a fused silica / quartz wafer made from Borosilicate 3.3 (Borofloat type), low thermal expansion coefficient. Listed geometry: plate shape. Temperature Heat Resistant Glass. Typical applications: Home Appliance. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Borosilicate 3.3 (Borofloat type), low thermal expansion coefficient |
| Type | Borosilicate Glass |
| Shape | Plate |
| Application | Home Appliance |
| Usage | Door, Window, Heat Resistant Glass |
| Model NO. | 80413 |
| Structure | Float Glass |
| Moh's Hardness | 7 |
| Function | Optical Function, Electromagnetic Function, Thermal Function, Biological and Chemical Function |
| Transparency | Transparent |
| Processing Method | Float Processing |
| Preparation Process | Float Processing |
| Color | Tranparent |
| Materials | Borosilicate 3.3 Glass |
| Temperature | Heat Resistant Glass |
| Property | Low Thermal Expansion |
| Long time (>10h) | 500℃ |
| Stock size | 1150*850mm /1700*1150mm |
| Supplier | Jinan Everest Glass Company Limited. |

## Technical data

| Parameter | Value |
| --- | --- |
| Density (25℃) ρ | 2.23±0.02g/cm3 |
| Modulus of elasticity | 68kN/mm2 |

| Parameter | Value |
| --- | --- |
| Co-efficient of expansion(20-300℃) | 3.3±0.1×10-6 |
| Softening point | 820±10℃ |
| Strain point | 516±10℃ |
| Heat conductivity at 90℃ | 1.2W/mk |
| Caloricity | (20-100℃) 0.82KJ × (kg×K)-1 |
| Thermal shock resistanceStrengthening type | 180K300K |
| Identical temperature differenceStrengthening type | 100K300 K |
| Maximum working temperatureShort time (<10h):Long time (>10h): | 500℃450℃ |

| Parameter | Value |
| --- | --- |
| Water resistance | ISO719/DIN12111 HGB1ISO720 HGA1 |
| Acid resistance | ISO1776/DIN12116 1 |
| Alkali resistance | ISO695/DIN52322 A2 |

## What to specify when you request a quote

- **Diameter and flat / notch** — listed as “1150*850mm /1700*1150mm”; state diameter, flat or notch and their tolerances.
- **Thickness and TTV** — give thickness, its tolerance and total thickness variation.
- **Polish and roughness** — specify single- or double-side polish and roughness.
- **Flatness, bow and warp** — quote flatness, bow and warp limits.
- **Material grade** — listed as “Borosilicate 3.3 (Borofloat type), low thermal expansion coefficient”; name the grade (JGS1/JGS2, Borofloat 33, alkali-free, sapphire orientation).

## Engineering guides for this part

For material grades and coating options, see [Borofloat 33 Glass: Material Selection for Precision Substrates](https://machiningglass.com/materials/borofloat-33-glass-material-selection-for-precision-substrates/). How parts like this are machined and finished is covered in [Precision Glass Wafer Dicing: Fused Silica & Borofloat Process Guide](https://machiningglass.com/capabilities/precision-glass-wafer-dicing-fused-silica-borofloat-process-guide/). For an application example, read [Fused Silica Glass Wafers for Precision Appliance Electronics](https://machiningglass.com/applications/fused-silica-glass-wafers-for-precision-appliance-electronics/). Before sending a drawing, check [Quartz Glass Manufacturing: Controlling Thermal Conductivity in Fused Silica](https://machiningglass.com/resources/quartz-glass-manufacturing-controlling-thermal-conductivity-in-fused-silica/). A related standard product is [Fused Silica Glass Wafers (2–12", JGS1/JGS2)](https://machiningglass.com/products/fused-silica-glass-wafers-2-12-jgs1-jgs2/).

## FAQ

### What is the Borosilicate Float Glass Heat Resistant Plate Wafer for Sight Glass made of?

It is listed as Borosilicate 3.3 (Borofloat type), low thermal expansion coefficient. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### Where is this fused silica / quartz wafer used?

Listed applications: Home Appliance.

### What should I include in a quote request?

Include diameter and flat / notch, thickness and ttv, polish and roughness, flatness, bow and warp and material grade, plus quantity and a drawing if the part is custom.

## Request a quote

Send drawings, tolerances and quantity: https://machiningglass.com/contact/?rfq_product_id=7549#mg-rfq

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Source: Custom Precision Glass Machining — https://machiningglass.com/