Sample Certificate of Analysis

Representative test results from SGS for Grade A fused silica. Every shipment includes a batch-specific COA matching your purchase specification.

Grade A — Representative SGS Test Results

Report No. MSRGZ2101581-01A · SGS Guangzhou · Tested per GB/T 3284-2015 (chemical), GB/T 16555-2017 (carbon), JY/T 0587-2020 (XRD)

Parameter	Test Method	Guaranteed Spec	Test Result
SiO₂	GB/T 3284-2015	> 99.9%	99.91%
Fe₂O₃	GB/T 3284-2015	< 50 ppm	41 ppm
Al₂O₃	GB/T 3284-2015	≤ 150 ppm (sand)	93 ppm
Na₂O	GB/T 3284-2015	< 50 ppm	24-27 ppm
Amorphous SiO₂	JY/T 0587-2020 (XRD)	> 99%	> 99%
Cristobalite	JY/T 0587-2020 (XRD)	< 0.1%	< 0.1%
TiO₂	GB/T 3284-2015	< 100 ppm	~50 ppm

Grade B — Representative SGS Test Results

Report No. MSRGZ2101620-01C · SGS Guangzhou

Parameter	Guaranteed Spec	Test Result
SiO₂	> 99.8%	99.88%
Fe₂O₃	< 80 ppm	60 ppm
Al₂O₃	≤ 500 ppm	410 ppm
Amorphous SiO₂	> 99%	> 99%
Cristobalite	< 0.1%	< 0.1%

How to read this COA: The numbers above are from SGS-tested samples. Each shipment receives its own batch-specific COA. SiO₂ values may vary by test method and laboratory — always check the method stated on the COA. See our COA reading guide for details.

Na₂O — the hidden number: Most fused silica COAs do not list sodium. But Na₂O catalyses the transformation of amorphous silica to cristobalite. The scientific threshold is ~2,200 ppm. Chemsize Grade A measures 24-27 ppm — roughly 80 times below. If your current supplier does not report Na₂O, ask why.

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This page shows representative test data from SGS reports. Actual batch results may vary within the guaranteed specification. Full SGS reports are available to qualified buyers on request. Method references: GB/T 3284-2015 (silica chemical analysis), GB/T 16555-2017 (carbon content), JY/T 0587-2020 (XRD phase analysis). Third-party XRD verification also available from Peking University Microstructure Laboratory (report 191028H09B01).