Application of HDPE countless, ranging from reusable thin-walled drink cup to the 5gsl tank, consumption of domestic production of HDPE 1/5. Injection molding grade general melt index of 5 ~ 10, with toughness is low liquidity grade and has high liquidity level processing of. Uses include daily necessities and food thin-walled packaging; food and paint cans ductile, durable; high resistance to environmental stress cracking application, such as small engine fuel tank and 90 gal garbage cans.

The melting point of HDPE is 142 ℃, decomb temperature 300 ℃; the injection temperature adjustable interval larger. Injection molding, general use temperature is 180 ℃ --230 ℃; because the olefine plastic, it does not absorb water, production, without drying, but to the quality of the products, can be 60 ℃ drying 1hr, to discharge the water; the melt viscosity of polyethylene, flow length ratio is small, thin-walled products may lack of glue, therefore, gate and runner is relatively large; products easy with static electricity, surface easy to absorb. Shrinkage rate was 16 ‰; overflow boundary value for 0.05mm.

        HDPE有數(shù)不清的應(yīng)用，范圍從可重復(fù)使用的薄壁飲料杯到5－gsl罐，消費(fèi)國內(nèi)生產(chǎn)的HDPE的1/5。注塑品級一般熔體指數(shù)5～10，有具有韌性較低流動性品級和具有可加工性的較高流動性品級。用途包括日用品和食品薄壁包裝物；有韌性、耐用的食品和涂料罐；高抗環(huán)境應(yīng)力開裂應(yīng)用，如小型發(fā)動機(jī)燃料箱和90－gal垃圾罐。
一般的HDPE熔點(diǎn)為142℃，分解溫度為300℃；注塑溫度的可調(diào)區(qū)間較大。注塑時，一般使用溫度為180℃--230℃；因是烯烴類塑料，它不吸水，生產(chǎn)時，不需烘干，但為了產(chǎn)品質(zhì)量，可用60℃溫度烘干1hr，以排出浮水；聚乙烯的熔體粘度大，流長比小，薄壁制品可能缺膠，因此，澆口和流道相對較大；制品易帶靜電，表面易吸埃。收縮率為16‰；溢邊值為0.05mm。