High Temperature Fire Resistant Sight Quartz Glass JGS2

High Temperature Fire Resistant Sight Quartz Glass is an extremely versatile material used in a range of different applications. It has outstanding thermal properties, excellent optical transmission, with good electricaland corrosion performance.

1.Spefications

2.Introduction

Production of Fused Silica or Quartz Glass

There are two basic ways of making quartz / silica glass:

• By melting silica grains either by gas or electrical heating (the type of heating affects some optical properties). This material can be transparent or, for some applications, opaque.
• By synthesising the glass from chemicals

The Difference between Fused Silica and Quartz Glass

This synthetic material, normally referred to as synthetic fused silica, has better optical properties

and is somewhat more expensive than the other type.

In the UK, terms such as quartz, silica, fused quartz and fused silica tend to be used interchangeably. In the USA, quartz refers to material melted from grains, silica refers to the synthetic material.

Applications of Fused Silica/Quartz Glass

Applications of fused silica/quartz glass include:

• Windows
• Lenses
• Mirror substrates
• Crucibles, trays and boats
• UV transmitting optics (synthetic fused silica)
• IR transmitting optics
• Metrology components

Advantages of Fused Silica/Quartz Glass

The advantages of fused silica or quartz glass include:

• Incredibly thermally shock resistant (can be taken from red heat and plunged into water without cracking)
• Low coefficient of thermal expansion
• Optical transmission properties from ultra violet to infra red
• Good chemical resistance
• Excellent electrical insulator

Properties of Fused Silica/Quartz Glass

The properties of fused silica or quartz glass include:

	Property	Units	Value
General	Chemical Formula	n/a	SiO2
	Density	g/cm3	2.22
Mechanical	Design Tensile Strength	MPa	48
	Design Compressive strength	MPa	1100
	Young's Modulus	GPa	72
Thermal	Max. Use Temperature	°C	950-1300
	Thermal Conductivity	W/m.K	1.4
	Co-Efficient of Linear Expansion	10-6/°C	0.55
Electrical	Volume Resistance	Ù.cm	1016
	Dielectric Constant		3.7
	Dielectric Strength	kV/mm	40

 

1. Transmission curve for 10mm thick fused silica/quartz glass (including surface reflection losses).

 

It is recommended that materials and components are tested for their suitability for a specific application.