The difference between plastic material PP and PE

Pp is the English abbreviation of polypropylene, Chinese name polypropylene.

Advantages of polypropylene (pp):

1, with excellent mechanical properties, its strength, elasticity are higher than HDPE, bending fatigue resistance is good.

2, with good heat resistance, melting point at 164-170 °C, products can be disinfected and sterilized at temperatures above 100 °C, heat deformation temperature can usually reach 110 °C, embrittlement temperature of -35 °C.

3, the chemical stability is very good, in addition to being attacked by concentrated sulfuric acid, concentrated nitric acid, other chemical reagents are relatively stable.

4, polypropylene combustion of high-frequency insulation performance is excellent, because it almost does not absorb water, so the insulation performance is not affected by temperature.

Disadvantages of polypropylene (pp):

1. The shrinkage rate is large, and the thick-walled products are easy to dent.

2. At low temperatures, the impact strength is poor.

3. High static degree, easy to age in contact with copper.

4. It is very sensitive to ultraviolet rays.

The advantages of impact-resistant modified pp compared with pure pp are:

1, impact strength, toughness and mechanical modulus significantly improved, as can be seen from the performance table, modified pp, on behalf of the rigid tensile strength, bending strength and hardness are higher than pure pp, and the impact strength representing toughness is also improved, especially improve the low temperature brittleness of pp.

2. Reduce the shrinkage rate and effectively improve the warpage deformation and surface shrinkage of the product.

3, improve the anti-aging of pp, greatly increase the service life of products.

Second, HDPE is the English abbreviation of high density polyethylene, Chinese called high-density polyethylene.

Advantages of high-density polyethylene (HDPE):

1. Good impact resistance and cold resistance, resistance to environmental stress cracking.

2. Excellent chemical stability and good oil resistance.

3, water absorption and tiny, low water permeability, organic steam transmittance is larger.

4, good electrical insulation, in all frequency range, dielectric properties are extremely excellent.

Disadvantages of high-density polyethylene (HDPE):

1, the use of HDPE temperature is not high, generally below 110 ° C.

2, HDPE aging resistance is poor, under the action of atmosphere, sunlight, oxygen, gradually become brittle, mechanical strength and electrical properties decreased.

3. At the molding temperature, due to oxidation, the viscosity will decrease, discoloration will occur, and stripes will occur.

High-density polyethylene (HDPE) performance table:

Cantilever beam notched impact strength j/m

Tensile yield strength/mpa

Elongation at break/%

Rockwell hardness

Density g/cm3

Melt flow rate g/10min

＞49

＞27

＞800

＞61

0.955-0.962

6.1-8.0

Note: The hdpe performance parameters are based on panjin petrochemical's 5070ea.

Abs is an English abbreviation for acrylonitrile butadiene styrene, Chinese called acrylic-butadiene-styrene copolymer.

Advantages of acrylic-butadiene-styrene copolymer (abs):

1. Good rigidity, high impact strength, and will not drop rapidly at low temperatures.

2, heat resistance and low temperature resistance is good, wear resistance is very high, chemical resistance, electrical performance is excellent.

3, easy to process, processing dimensional stability.

4, the surface gloss is good, easy to paint, coloring, but also spray metal, electroplating, welding and bonding and other secondary processing performance.