Performance
General performance
Polyethylene resin as a non-toxic, tasteless white powder or granules, a milky white appearance, a waxy feel, low water absorption, less than 0.01%.Gaosuibuyou Thailand poly bags Polyethylene film transparent, and the crystallinity decreased. Polyethylene membrane permeation rate is low but the permeability of the larger, not suitable for fresh keeping packaging suitable for moisture proof packaging. Flammable, oxygen index is 17.4, when burning low smoke, a small amount of molten drop, the flame yellow basket, with paraffin smell. Polyethylene water resistance is
Good. Products surface polarity, difficult to adhere and printing, the surface processing improvements. Branched chain of the light degradation and oxidation resistance ability.
Mechanical properties
The mechanical properties of polyethylene, low tensile strength, creep resistance is not good, good impact resistance. The impact strength of LDPE > LLDPE > HDPE, and other mechanical properties of LDPE < LLDPE < HDPE. Mainly affected by density, crystallinity and molecular weight effects, as these indicators improved, its mechanical properties increase. Environmental stress cracking resistance is not good,plastic bags supplier but when the relative molecular mass increases, improvement. Puncture resistance, where LLDPE best.
Thermal properties
Polyethylene heat resistance is not high, with the relative molecular mass and the degree of crystallinity enhancement improvement. Low temperature resistant performance is good, the brittle temperature generally up to 50 DEG C; and with the increase of relative molecular mass, minimum 140 C. Polyethylene linear expansion coefficient, maximum ( 20 ~ 24 ) x 105 / K. High thermal conductivity.
Electrical properties
For polyethylene polarity, so it has low dielectric loss, dielectric strength of the electric performance, which can be used for FM insulating materials, corona resistant plastics, and can also be used as a high voltage insulating materials.
Environmental performance
Polyethylene belongs to the alkane inert polymer, it has good chemical stability. At room temperature, acid, alkali, salt solution corrosion, but not resistant to strong oxidizing agents such as fuming sulfuric acid, nitric acid and chromic acid. Polyethylene at 60 deg.c insoluble in common solvents, but with an aliphatic hydrocarbon, aromatic hydrocarbon, halogenated hydrocarbons and other long-term exposure may swell or cracking. Temperature is higher than 60 DEG C, can be a small amount of soluble in toluene,solar module cell acetic ester, trichloroethylene, turpentine, mineral oil
And paraffin; temperature higher than 100 DEG C, soluble in the four hydrogenation of naphthalene.
Due to polyethylene molecule contains a small amount of double bonds and ether bond, and the weather is not good, the sun, rain will be cited
On aging, requires the addition of antioxidant and light stabilizer to improve.
