Polypropylene (PP) is a plastic polymer, tough and lightweight with low
water absorption and often chosen for its resistance to corrosion and
excellent chemical resistance. Polypropylene offers an
excellent combination of mechanical, physical, thermal and electrical
properties compared to other plastics. This low cost plastic is often
compared to high density polyethylene (HDPE), although it has lower impact
strength, Polypropylene has superior tensile strength and working
temperature. Polypropylene provides outstanding resistance to organic
solvents, degreasing agents and electrolytic attack. This material is
resilience against most forms of physical damage, including impact and
Polypropylene is available in two main grades, Polypropylene
homopolymer and Polypropylene copolymer. Both have very similar
properties but appearance and performance differences are distinctive
between the two types. Polypropylene homopolymer or PPH
for short is stronger and stiffer than copolymer and more widely used. With
the combination of excellent chemical resistance and the ability to be
joined and welded by heat fusion makes this an ideal plastic for chemical
tanks and structures in corrosive environments.
Polypropylene copolymer and commonly abbreviated as PPC is
tougher and more durable than PPH . Although polypropylene copolymer is
softer, it offers better impact strength and tends to have better stress
resistance and toughness even at low temperatures compared to Polypropylene
Polypropylene is used in many different applications from
industrial, consumer goods to display applications. Polypropylene is used
extensively in manufacturing chemical tanks, structural tank, liners and
covers. Other common applications include, industrial battery covers, pump
components and impellers. Polypropylene sheeting is also used for
hygienic cladding applications. FDA Food approved makes this an ideal
plastic material for food processing applications and components.
Polypropylene is reasonably economical, and can be made translucent when
uncolored; the natural finish is a milky white finish. Polypropylene is
difficult to bond with adhesives due to its chemical resistant properties
and welding and mechanical fixing is recommended.
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