Pigments for LDPE

Low-density polyethylene is mostly converted into flexible film, bags, liners and squeeze bottles at lower processing temperatures than HDPE, so heat stability requirements are somewhat easier, but migration and dispersion become the main concerns. In thin flexible film, poorly dispersed pigment shows as specks and pinholes, and migrating pigment can bloom to the surface or bleed into contents. Buyers should confirm low-migration grades, excellent fine dispersion for thin gauges, and, for outdoor film like agricultural covers, adequate light and weather fastness alongside compatibility with any UV stabiliser package.