Polyethylene (PE) low-density 0.910~0.925 products are milky white, semi transparent, waxy, and have a soft and smooth feeling when touched by hand; Slightly elongated and easy to burn, continuing to burn after leaving the flame. The upper part of the flame is yellow and the lower part is blue; Melting and flowing, smokeless, with a smell similar to that of a candle, able to float on the water surface. Sinking in 58.4% ethanol solution, blow molded film, hollow injection products, water pipes, and daily necessities have a density of 0.926~0.940, and a high density of 0.941~0.965
Polypropylene (PP) 0.905 (23 ℃) is white, semi transparent, waxy, harder than PE, and has better transparency than PE; Low breathability and easy to burn, able to sustain combustion without fire. The upper part of the flame is yellow, and the lower part is blue; The material melts and flows, emitting black smoke and a petroleum odor that can float in 58.4% ethanol solution and water. Woven bags, ropes, fishing nets, medical equipment, filter fabrics, waterproof fabrics, cotton products, flanges, bicycles, automotive parts, and daily necessities are also available
Polyvinyl chloride (PVC) hard 1.35-1.45 pure PVC products are yellow and transparent, with better transparency than PE and PP, but not as flammable as PS. They extinguish immediately after leaving the flame, and the upper part of the flame is yellow and the lower part is green with white smoke during combustion; There is a stimulating sour taste in saturated salt solution and water. Soft materials such as sinking plates, tube pump bodies, and shaped materials such as thin film wire sheaths, shoe soles, and daily necessities are 1.16-1.35
Polystyrene (PS) 11-3.6 is colorless and transparent, similar to glass products, brittle and prone to cracking. It emits a metallic sound when dropped and is flammable. It continues to burn after leaving the fire. The flame is orange yellow in color; When the material softens, it bubbles and emits black smoke, which sinks in water and can float in a solution of calcium chloride. Cups, plates, and other tableware, cultural and educational items.
