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| International Standard Category: Organic acids |
GB/T 30921.7-2016 Test method of purified terephthalic acid (PTA) for industrial use一Part 7:Determination of b*value一Color difference meter
工业用精对苯二甲酸（PTA）试验方法 第7部分：b*值的测定 色差计法 ;
| Category No.: | 71.080.40 | Valid Status: | valid |
| Issued Organization: | AQSIQ; SAC | Issued Date: | 2016-06-14 |
| Implemented Date: | 2017-1-1 | Abolished Date: | |
| Superseded Standard.: | Superseded Date: |
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