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Client won't accept 3.1 cert, insists on 3.2 — what's the difference?｜Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）
3.1 is issued by in-house QC; 3.2 adds third-party verification; the inspection content is the same — the difference is who verifies. Heat number + PMI as backstop.
Conclusion：3.1 is issued by in-house QC; 3.2 adds third-party verification; the inspection content is the same — the difference is who verifies. Heat number + PMI as backstop.
This conclusion is compiled from our technical article: 不锈钢质保书怎么看：EN 10204 3.1与3.2的区别 (EN 10204 3.1与3.2一文). Verify against your actual duty; call us to discuss.
Selection notes
3.1 in-house, 3.2 adds third-party; same content, differs who verifies; heat + PMI backstop.
Industry & scenario
Procurement, inspection & certification
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This article is written by @Stainless Insights. @Stainless Insights is the technical byline of Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司） (focused on specialty stainless steel selection and import substitution), with nearly 20 years in stainless processing and selection in Foshan. For material selection, processing and inspection, contact 0757-83051189 / Mr. He 13703060845.