Heat-stable organic pigments validated to 240-280°C for HDPE pipe, bottle, film, and PP injection moulding masterbatch.
Discuss Your ApplicationHDPE pipe, bottle, film, and PP injection moulding masterbatch processed at 240-280°C requires pigments that survive the heat without color shift, decomposition, or specks. The wrong pigment shows up as warping, brown spots, or off-shade end product — a costly rejection at QC.
Heat-stable masterbatch pigments are a specific subset of the organic pigment universe. Standard azo grades like PY3, PY14, and PY74 will decompose above 220°C. For HDPE/PP processing, you need diarylide HR (heat-resistant) yellows (PY83), benzimidazolone yellows (PY154, PY155), quinacridone reds (PR122, PR202), DPP reds (PR254, PR264), and phthalocyanine blues and greens (PB15:1 alpha, PB15:3 beta, PG7).
Heat stability is measured by injection moulding the pigment into the target polymer at progressive temperatures (200°C, 240°C, 280°C, 300°C) and measuring ΔE color shift versus a reference. The maximum temperature at which ΔE remains less than 1.5 is the heat stability rating. Always specify a pigment rated 10-20°C above your maximum processing temperature for safety margin.
For potable water HDPE pipes, additional NSF or local food-contact certifications apply. We can provide grade-specific compliance documentation for your regulatory submission. Our masterbatch-grade pigments are validated for use across HDPE, LDPE, LLDPE, PP, EVA, and engineering polymer carriers.
HDPE pipe extrusion typically processes at 220-240°C, requiring pigments rated to at least 240°C with a 10-20°C safety margin (so practical minimum: 260°C). Grades like PY154, PY83, PR122, PR254, PB15:1, PB15:3, and PG7 all meet this requirement. Standard azo pigments rated to 200°C or below will fail.
PP injection moulding at 240-280°C uses: PY154 (benzimidazolone yellow), PY83 (diarylide HR), PY155 (disazo yellow), PR122 (quinacridone), PR254 (DPP red), PB15:1, PB15:3, PG7, and PG36. These maintain shade integrity through processing without decomposition or color shift.
Many of our heat-stable grades are formulated to be compatible with food-contact and potable-water HDPE applications, but each end-use requires specific regulatory verification (FDA 21 CFR, EU 10/2011, NSF, or local equivalents). Contact [email protected] with your specific application and destination market for grade-specific compliance documentation.
Share your binder system, processing temperature, and required performance — our technical sales team will recommend the right grade and ship a free 50-100g sample for qualification.
