Clear quartz glassware ---- glass standard

This standard applies to transparent quartz glassware for laboratory use. Transparent quartz glassware QSQ gas refining transparent quartz glassware DSQ electric melting transparent quartz glassware two kinds.

1. Technical requirements 1. Physical chemical performance indexes (1) Chemical composition QSQ DSQ The total content partial content limit of main impurity elements should be the same as corresponding QTS2 DTS1. (2) the thermal stability test samples at 1100℃ to 20℃ temperature change three times, no crack, (3) crystal resistance a.Q SQ gas refining transparent quartz glassware samples at 1200℃, constant temperature for half an hour, is allowed to appear diameter of more than 3 mm crystallization white point, 0.5 ~ 3 mm crystallization white point, No more than 10 per 100 square centimetres. B. SQ electrofused transparent quartz glassware sample at 1200℃, constant temperature for half an hour, at 500 nm wavelength transmittance, less than 85%. (4) High temperature discoloration DSQ sample at 1100℃. Keep the temperature constant for 1 hour without discoloration. 2. Appearance index (1) QSQ gas refined transparent quartz glassware is divided into two levels according to bubbles (see Table 1). Table 1 Grade one two gas diameter (mm) 0.1￣0.5 0.3￣0.7 allowed number of bubbles (PCS/cm 2) ≤4≤6 Filament length diameter (mm) 0.5￣3.0 1.0￣7.0 Bubble dot diameter (mm) 0.3￣2.0 0.5￣3.0 group allowable total (PCS /100 cm 2) ≤5≤8 Dark long diameter (mm) 2.0￣3.0 2.0￣4.0 scar allowable number (bar /100 cm 2) ≤3≤4 color filament long diameter (mm) 0.1￣1.0 0.2￣1.5 dot diameter (mm) 0.1￣0.3 0.2￣0.5 Spots allowed total (PCS / 100cm 2) ≤3≤4 Transparent particles (PCS / 100cm 2) ≤30≤50 Ripples (mm) ≤0.2≤0.3 Water area (mm 2) ≤10 Traces Allowed quantity (PCS / 100cm 2) Disallowed ≤2 Pinch mark size (mm) disallowed ≤φ13 Pinch mark depth (mm) disallowed ≤0 3 notch Number of notch no more than 50 ml no more than 2 51 ml no more than 3 Cloud no more No more (2)DSQ capacitive transparent quartz glassware is divided into two levels according to the indicators in Table 2 3. Table 2 Class 1 2 Color Filaments length diameter (mm) 0.1￣1.0 0.2￣1.5 Dot diameter (mm) 0.1￣0.3 0.2￣0.5 spot allowed total number (PCS /100 cm 2) ≤2≤4 Color line allowed one blue line translucent cloud allowed Note: The width of blue line allowed for Grade 2 products should be greater than 0.3 mm. The length of blue line under 500 ml shall be greater than 30 mm; larger than 50mm (excluding blue line under 10mm) for 600ml above. Table 3 Item 50￣200 250￣500 600￣1000 Indicator Level one two two one two Capacity (mL) Air line length (mm) 1￣5 1￣1