Quartz exhibits excellent optical transparency, especially in the UV to IR spectral range, making it ideal for precision optics. It has a very low thermal expansion coefficient, high thermal stability (softening point around 1700°C), and outstanding chemical resistance to most acids and alkalis. Additionally, quartz is mechanically strong, electrically insulating, and highly durable under extreme environmental conditions.
 

Property	JGS1  Quartz		JGS2  Quartz		Borosilicate Glass BF33
Material	High-purity（synthetic ）		Medium-purity（natural or synthetic）		Borosilicate glass (contains boron oxide)
Main Composition	SiO₂ (>99.99%)		SiO₂ (>99.9%)		SiO₂ (~81%), B₂O₃ (~13%)
Hydroxyl	~1000 ppm		~200 ppm		<10 ppm
Thermal Expansion Coefficient	0.55 × 10⁻⁶ /K		0.55 × 10⁻⁶ /K		3.25 × 10⁻⁶ /K
Heat Resistance	softening point ~1700°C		softening point ~1700°C		softening point ~820°C
Transmission Range	185–2500 nm		220–2500 nm		300–2500 nm
UV Transmission	Excellent (high transmittance＞185 nm)		Poor (low transmittance ＜ 220 nm)		Poor (low transmittance ＜ 300 nm)
IR Transmission	Poor (affected by absorption at 2.7 µm)		Good (high transmittance at 2.7 µm)		Good (high transmittance at 2.7 µm)
Chemical Stability	Excellent		Excellent		Good
Mechanical Strength	High		High		High
Main Applications	UV optics, lasers, semiconductors		IR optics, general optics, laser windows		Optical windows, lab equipment, display panels