What is the typical purity level of reworked magnesium oxide?
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Reworked magnesium oxide can usually reach ≥99.9% purity if nitrogen-protected sintering and pollution control procedures are properly adhered to, and high-purity raw materials (e.g., ≥99.95%) are utilised. The final product should have at least 60% active magnesium oxide and at least 95% MgO content (HG/T 3928-2012).
Important Elements Influencing Final Purity
Factors | Conditions for Achieving High Purity | Risk Alerts
Purity of Raw Material | Use powdered magnesium oxide that is at least 99.9% pure (e.g., made by Liaoning Jiashun Technology). Raw ingredients with low purity immediately reduce the total level.
Process Contamination Control | Cleanroom operations + protection from high-purity nitrogen (oxygen concentration <100 ppm). Moisture and contaminants are easily introduced when operating in an open environment.
Equipment Cleanliness | Before using filling and sintering equipment, purge it with high-purity nitrogen. Localised reductions in purity are caused by residual contamination.
Detection Techniques | Chemical analysis (such as acid-base titration) by a third-party CNAS organisation. Purity cannot be accurately determined by simple procedures.
A stable MgO concentration of more than 95% can be attained under standardised procedures, however CNAS certification testing is required to confirm this.
Typical Reference for Reworked Purity Data
The item
Goal Amount
Range Measured (Compliant Procedure)
Content of MgO
≥95%
95.2% to 97.8%
Magnesium oxide that is active
≥60%
62%–68%
Cl⁻ Content
≤0.02%
Between 0.012% and 0.018%
Fe₂O₃ Content
≤0.05%
Between 0.03% and 0.045%
Data Source: Zhongxi Testing and Wuhan Kehai Inspection Co., Ltd.'s batch testing reports of modified parts (2025–2026).
How Can High Purity Be Ensured?
Source Control: Utilise only CNAS-tested, high-purity source materials;
Process Protection: Total shutdown to prevent cross-contamination and moisture absorption;
