1. Production units must be in accordance with the standards and requirements of the provisions of the unit, check the quality of manufactured products.

2. Quartz glass products, the factory should be accompanied by product certification and product manual. Certificate must be the main chemical composition of products, performance indicators and inspectors signed, indicating the date of production, and printed with the name of the factory Or production code.

3. High purity coated quartz glass products, the factory should be attached to the product coating weight.

4. Each low-expansion quartz glass tube is subject to titanium dioxide content analysis and product number.

5. The order unit shall be able to test the quality of the product according to the agreement approved by both sides of the quartz glass department and the agreement approved by both parties. If there is no compliance with the standard and the ordering agreement, the duplicate samples shall be inspected for repeated inspection. Meet the product standards and order agreement, according to the unqualified in the receipt of six months after the quality problems if not found.