Question 1

What is the difference between fused quartz and fused silica?

Accepted Answer

Fused quartz is melted from purified natural quartz crystal, while fused silica is usually synthesized from silicon-containing chemicals such as SiCl4. Fused quartz offers excellent thermal performance at a lower cost and suits most furnace, lighting and laboratory uses; synthetic fused silica is chosen when the deepest UV transmission and lowest metallic impurities are required.

Question 2

What temperature can your quartz glass tubes withstand?

Accepted Answer

Our transparent fused quartz tubes are typically used continuously up to about 1100 °C and for short periods up to about 1450 °C. The softening point is approximately 1683 °C. Because the thermal expansion coefficient is only about 5.5 × 10⁻⁷/°C, the tubes tolerate rapid heating and cooling far better than borosilicate glass.

Question 3

Can you manufacture custom quartz parts from my drawing?

Accepted Answer

Yes. We have more than 11 years of OEM experience and offer OEM, ODM and buyer-label services. Send your drawing, material grade and quantity to info@kemzoquartz.com and our engineers will confirm feasibility, tolerances and lead time.

Question 4

Which payment and delivery terms do you accept?

Accepted Answer

We accept T/T, L/C, PayPal and cash, in USD, EUR, AUD, HKD or CNY. Delivery terms include FOB, CFR, CIF, EXW, DDU, DAF and express door-to-door delivery.

Question 5

How do you pack fragile quartz glass for export?

Accepted Answer

Each item is individually protected with foam or bubble cushioning, tubes are separated so they cannot touch, and cartons are secured inside export-grade wooden cases for sea and air freight. Packing can be adapted to your warehouse handling requirements.

Question 6

Which countries do you export to?

Accepted Answer

Between 71% and 80% of our output is exported. Our main markets are North America, Eastern Asia including South Korea, Southeast Asia, Europe, South America and Oceania.