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- Quality control starts from the source — supplier
- The suppliers of Sinorock® are professional manufacturers, which all have rich production experience over 20 years. Some of these suppliers have cooperated with Sinorock® over 10 years. All of the production equipment are from domestic first-class manufacturers. The raw material is controlled strictly to make quality stable.
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- Supplier grading system
- Sinorock® applies supplier grading system to ensure the quality of raw material.
Grade A: Excellent.
Grade B: Good.
Grade C: Fair.
Grade D: Indeterminate.
Grade E: Unqualified.
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- 4 steps to manage supplier
- Evaluate: Sinorock® evaluates every new-developed supplier comprehensively from multi-perspectives.
Check: Sinorock® will make annual assessment for every supplier.
Test: Sinorock® will appoint inspector to supplier’s factory to finish field inspection.
Track: Sinorock® will appoint staff to track the production schedule.
