Most of round bucket and square bucket of our company is in PP material, in some times, we could do it in HDPE material according to clients requirments.
But what is PP material ?
Polypropylene (PP) is similar in many respects to high-density polyethylene (HDPE). However, instead of forming a long polymer chain made up of repeating –CH2 components, the porous polypropylene molecule has a series of CH3 groups that hang off the main carbon backbone. Porex porous PP is isotactic — that is, the CH3 groups are oriented on one side of the carbon backbone. This orientation creates a greater degree of crystallinity, making PP stiffer and more resistant to creep (the tendency to flow under stress) as compared to polyethylene (PE).
Polypropylene (PP) is highly resistant to most acids and alkalis. It is resistant to most organic solvents below 176°F (80°C). Its use at high temperatures depends on conditions in addition to heat, but as a rule, PP may be used at temperatures ranging from 200 to 300° F (93°C to 149°C) if not stressed. Thus, porous PP products can be sterilized in an autoclave.
The advantage of PP material :
Polypropylene, like every other polymer, has advantages and disadvantages that make it more suitable for certain uses than others.
Advantages of polypropylene:
It is a relatively inexpensive material
It possesses high flexural strength because of its semi-crystalline nature
It has a low coefficient of friction
It is very resistant to moisture
It has good chemical resistance over a wide range of bases and acids
It possesses good fatigue resistance • It has good impact strength
It has a good resistance to electricity and is thus a good electrical insulator
It is more easily repaired from damage
