honor Both are copper phthalocyanine blue. Same molecule, different crystal. PB15:1 is alpha (reddish, easy to disperse). PB15:3 is beta (greenish, heat-stable). Here’s when to use each — and when you’ll regret picking wrong.
TL;DR — Blue Wool Scale（BWS）7 级和 8 级之间不是差”一格”，是对数差距。BWS 7 的颜料在氟罗里达外墙涂料里撑不过 5 年，而汽车 OEM 涂料直接不接 BWS 7。更要命的是：厂商给你的耐光数据，99% 是用全色（full shade）测的。你实际用的配方如果是冲淡色（reduction），耐光可能直接掉 3-4 级。一份靠谱的耐光数据，必须写清楚三件事：测试浓度、暴露标准、评级方法。缺任何一个，别信。 7 级和 8 级，不是差一个数字那么简单 先说一个大部分人不知道的事：Blue Wool Scale 是对数尺度。 每一个等级之间，耐光能量大致翻倍。BWS 1 在 Xenon arc 下几小时就变，BWS 8 要几百甚至上千小时。具体到我们行业最常碰到的两个等级： BWS 7：Xenon arc（ISO 105-B02）约 200-300 小时不出明显变色 BWS 8：Xenon arc 约 400-800 小时，好的能上千 换句话说，从 7 到 8，不是加了 14%，是耐光能力至少翻了一倍。 这个差距在真实环境里意味着什么？ 建筑外墙涂料（氟罗里达 … Read more
100 grams is not a qualification sample. Here’s the real material budget for dispersion, rheology, colorimetry, and QUV aging—and a production-proven protocol from a mid-size ink plant.
PR57:1 red ink looks fine on press but bleeds into LDPE during extrusion lamination at 320°C. The culprit isn’t solvent — it’s thermal dissolution-diffusion. Here’s how to confirm the mechanism, three pigment alternatives with cost-performance trade-offs, and the barrier-layer fix when substitution isn’t an option.
FDA 21 CFR and Your Pigment Spec — Indirect Food Contact, No Jargon, No Guessing TL;DR — The US FDA does not approve or certify pigments. It publishes conditions of use under 21 CFR. If your pigment sits behind a functional barrier in a coating on paper, metal, or plastic that contacts food, you need … Read more
REACH compliance for organic pigments is not a yes/no checkbox. A supplier saying “we are REACH registered” can mean three different things — only one holds up under scrutiny. This guide covers the documents, registration types, and test reports procurement teams should verify before importing organic pigments into the EU.
TL;DR — NC-based gravure inks that thicken or gel above 35°C aren’t just “heat sensitive.” The real culprit is acid-catalyzed nitrocellulose degradation, kicked off by residual acidic groups on the pigment surface — especially barium and calcium salt lakes like PR48:2. Measure the pigment’s acid value. If it’s above 5 mg KOH/g, you’re sitting on … Read more
PB15:3 is the most thermally stable organic blue on the market, but powder coating systems have their own physics. Low shear during extrusion, 200°C cure cycles, and electrostatic application all create failure modes you won’t find in liquid paint. I’ve traced five recurring problems back to root causes and tested fixes on real lines.
Most PR170 TDS sheets report lightfastness at full shade — but your coating is a 1:10 TiO₂ reduction. At that dilution, Blue Wool drops from 6-7 to 3-4. Diagnosis and fix chain for formulators.
Introduction: PY83 and PY12 Are Both Diarylide Yellow Pigments Pigment Yellow 83 (PY83) and Pigment Yellow 12 (PY12) are two widely used Diarylide Yellow organic pigments. Both pigments are known for their bright yellow shades, good color strength, and cost-effectiveness, making them popular choices in printing inks, plastics, and other industrial applications. However, despite belonging … Read more