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High density (HDPE) is rough to touch and produces a rustling sound, while low density (LDPE) is smoother and has a softer feel; When looking at objects, high-density transparency is poor, while low-density is better; High density is more resistant to high temperatures, while low density is more resistant to low temperatures; Another factor is that HDPE has good longitudinal tear resistance but poor transverse strength, while LDPE has the opposite effect.
