ISO 23900-3:2015 标准是针对颜料和扩展剂在塑料中的分散方法和分散性评估的标准之一。本标准主要针对黑色和彩色颜料在聚乙烯中的色彩特性和分散易度进行测定，采用两辊磨机进行测试。

该标准的测试方法主要包括以下步骤：

1. 准备样品：将颜料或扩展剂与聚乙烯混合，制备成厚度为1mm的样品。

2. 测试设备：使用两辊磨机进行测试，其中一辊为硬质辊，另一辊为软质辊。

3. 测试过程：将样品放置在两辊磨机中，进行10次往返磨研，每次磨研的间隔时间为1分钟。然后将样品取出，进行色差测定和分散性评估。

4. 测试结果：根据测试结果，评估颜料或扩展剂在聚乙烯中的分散性和色彩特性。

该标准的测试结果可以用于评估颜料或扩展剂在聚乙烯中的分散性和色彩特性，为塑料制品的生产提供参考依据。同时，该标准的测试方法简单易行，可以广泛应用于塑料制品的生产和质量控制中。

相关标准
- ISO 23900-1:2019 Pigments and exters — Methods of dispersion and assessment of dispersibility in plastics — Part 1: General introduction
- ISO 23900-2:2019 Pigments and exters — Methods of dispersion and assessment of dispersibility in plastics — Part 2: Determination of colouristic properties and ease of dispersion of white and light-coloured pigments in polyethylene by two-roll milling
- ISO 23900-4:2019 Pigments and exters — Methods of dispersion and assessment of dispersibility in plastics — Part 4: Determination of colouristic properties and ease of dispersion of black and colour pigments in polyolefin moulding materials by injection moulding
- ISO 23900-5:2019 Pigments and exters — Methods of dispersion and assessment of dispersibility in plastics — Part 5: Determination of colouristic properties and ease of dispersion of black and colour pigments in polyethylene using a high-speed mixer
- ISO 23900-6:2019 Pigments and exters — Methods of dispersion and assessment of dispersibility in plastics — Part 6: Determination of colouristic properties and ease of dispersion of black and colour pigments in polypropylene using a high-speed mixer