The dyne pen test, also known as a surface tension test, involves gently swiping a dyne pen perpendicular to the surface and observing if the ink retracts or forms water droplets. A non-retracting, non-beading ink pattern generally indicates better surface properties. Surface energy is critical here—lower surface energy often leads to poor performance in subsequent operations like coating or anodizing.
Whether silicone-containing release agents pass the dyne pen test depends on their compatibility with die-casting conditions. If the release agent ensures good cleaning performance post-demolding, it usually passes standard anodizing tests. However, for high-demand applications, silicone-free release agents (e.g., Kezhiying brand) are recommended.
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