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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 13021-2023 |
Polyolefin pipes and fittings - Determination of carbon black content - Calcination and pyrolysis methods {译} 聚烯烃管材和管件 炭黑含量的测定 煅烧和热解法 |
China National Standards Polyolefin pipes fittings |
 English PDF |
| GB/T 18251-2019 |
Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds 聚烯烃管材、管件和混配料中颜料或炭黑分散度的测定 |
China National Standards Polyolefin pipes fittings |
English PDF |
| GB/T 18251-2000 |
Method for the assessment of pigment or carbon black dispersion in polyolefin pipes，fittings and compounds 聚烯烃管材、管件和混配料中颜料或炭黑分散的测定方法 |
China National Standards Polyolefin pipes fittings |
English PDF |
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