The certificate and the third-party chemical analysis buyers usually ask for, with the documents themselves below. Our ISO 9001 certificate covers the manufacturing of ceramic protection tubes for thermocouples, and the same lab has analysed our alumina tube every year since 2024.
Quality management
GB/T19001-2016 · certified by CFL Certification Center
The issuer listed this certificate as valid when checked on 6 October 2026. Check the issuer’s record (Chinese).
A copy of the certificate is available on request.
Independent lab test
Alumina tube sample, tested by Chinalco Testing Technology (Zhengzhou) Co., Ltd., 13 May 2026. Report 26-04928.
| Item | % | Method |
|---|---|---|
| Al₂O₃ | 99.61 | GB/T 24487-2022 |
| SiO₂ | 0.15 | GB/T 6609.3-2004 |
| Fe₂O₃ | 0.014 | GB/T 6609.4-2004 |
| Na₂O | 0.054 | GB/T 6609.1-2018 |
| CaO | 0.13 | GB/T 6609.1-2018 |
| Loss on ignition | 0.033 | GB/T 6609.2-2022 |
Tested by the same lab every year
Lab reports are available on request.
06525Q02034R1S · 26-04928
Request a quote
Tell us the dimensions, grade and quantity. We confirm the grade, dimensions and tolerances in each quotation. Our yearly lab reports are available on request.