high density polyethylene

Polyethylene sheet is engineering plastic raw materials, not easy to be water erosion, with high rigidity, toughness good resistance to environmental stress cracking and low temperature performance, water absorption is very low, and insulation.Product Description
High density polyethylene (HDPE) is a white powder or granular product. Non-toxic, tasteless, crystallinity was 80% ~ 90%, softening point is 125 l ~ 35 ℃, using temperature is 100 ℃; Hardness, tensile strength and creep are better than low density polyethylene. Good wear resistance, electrical insulation, toughness and cold resistance; Good chemical stability, insoluble in any organic solvent at room temperature, resistant to acid, alkali and all kinds of salt corrosion
Low pressure ethylene

[basic properties] hdpe is an opaque white waxy material, lighter than water, with a specific gravity of 0.941~0.960. It is soft and ductile, but slightly harder than LDPE and slightly elongated. It is non-toxic and tasteless.
[combustion characteristics] flammable, can continue to burn after leaving the fire, the upper end of the flame is yellow, the lower end is blue, the combustion will melt, liquid dripping, no black smoke, at the same time, the smell of paraffin burning.
[main advantages] acid and alkali resistance, resistance to organic solvents, excellent electrical insulation, low temperature, can still maintain a certain degree of toughness. Surface hardness, tensile strength, rigidity and other mechanical strength are higher than LDPE, close to PP, than PP toughness, but the surface finish than PP.
[main disadvantages] poor mechanical properties, poor air permeability, easy deformation, easy aging, brittle, brittle than PP, easy stress cracking, low surface hardness, easy to scratch. Difficult to print, printing, surface discharge treatment, not electroplating, dull surface.
[application] used for extrusion packaging film, rope, woven bag, fishing net, water pipe; Injection molding low-grade commodity and shell, non-load bearing components, plastic box, turnover box; Extrusion blow molding containers, hollow products, bottles.
[injection molding process] HDPE has numerous applications, ranging from reusable thin-walled beverage cups to 5-gsl cans, and consumes 1/5 of the HDPE produced domestically. The general melt index of injection products is 5 ~ 10, and there are products with low toughness and high flowability. USES include daily necessities and food thin-wall packaging materials; Flexible and durable food and paint containers; High resistance to environmental stress cracking applications, such as small engine fuel tanks and 90-gal waste tanks.
General HDPE melting point is 142 ℃ and decomposition temperature is 300 ℃; The adjustable range of injection molding temperature is large. When we do the injection, generally using temperature is 180 ℃ -- 230 ℃; For olefin is plastic, it's not bibulous, production, without drying, but for the sake of the quality of our products available 60 ℃ temperature drying 1 hr, to floating; Polyethylene melt viscosity, flow length ratio is small, thin wall products may lack of glue, therefore, the gate and runner relatively large; The product is easy to take static electricity, the surface is easy to absorb. The shrinkage rate was 16‰; The overflow boundary value is 0.05mm.