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Home : Products : PPH Introduction
 General properties of Polypropylene:
Polypropylene (PP) belongs to the Polypropylene is a thermoplastic from the polyolefin group. PP is a semi-rigid, translucent polymer with good toughness and weather resistance properties. It has low water absorption and is easily moulded as low cost. Polypropylene is a largely non-polar, partially crystalline thermoplastic with a crystallinity of 60 to 70%. PP has a density of 0.90 to 0.91 g/cm3 which is amongst the lowest densities for all plastics. PP has a non-swelling and insoluble surface; and is characterized by its outstanding chemical resistance, high thermal resistance and good fatigue strength.

Its superior qualities and cost efficiency makes it a popular material of choice over Polyethylene (PE) and Polyvinyl Chloride (PVC) in industrial uses and also commercial uses. Due to its excellent thermal stability, PP can be used successfully even at 1000C.
It shows superior impact strength as compared with PVC. PP is normally available in grey color and its high rigidity makes visually pleasing pipe layouts possible and the lower coefficient expansion makes installation easier.
It is generally available in three forms for use in pipelines PP- Homopolymer (PP-H), PP-copolymer (PP-C) and PP Random Copolymer (PP-R). Other options in PP include fire retardant grades & electro-conductive grades. PP can also be UV stabilized by use of a stabilizer and can be produced in black color.
Various types of commercially available PP includes the following:
 PP- Homopolymer (PP-H) :
PP - Homopolymer is produced by a continuous chain of polypropylene units which results in a high stiffness material. Mostly popular in grey colors only. Advanced homopolymer types like beta nucleated PP, are widely used to make piping systems.
 PP- Block copolymer (PP- B) :
PP- Block copolymer (PP - B) Produced by adding 4-15% ethylene to the polypropylene gives much improved impact strength and considerably lowers the brittle point such that it is well below normal service temperatures i.e. -15 to -20oC. Material is available in natural & grey colors.
 PP Random Copolymer (PP-R) :
Random copolymer PP typically contains between 1 and 7 wt.-% of ethylene molecules and 99 to 93 wt.-% propylene molecules. The ethylene molecules are inserted randomly between the propylene molecules in the polymer chain. Random copolymer polypropylene is a clear, semi-crystalline polymer which exhibits high stiffness, better impact strength and good electrical insulation properties.
 PP Fire retardant (PPFR) :
PP is enhanced by additives to limit its oxygen index. Available in V0, V1 & V2 classifications.
 PP Electro-conductive (PP- Cond) :
Also another type enhanced PP, developed especially for use application may require earthing of the piping system.
 Features and Advantages of use vs. other materials :
Polypropylene combines all the required favorable properties for modern industrial pipeline constructions, including :
arrow bullet Excellent Chemical Resistance  - Increases reliability and scope of use
arrow bullet High Impact Strength - Better durability
arrow bullet High Thermal Resistance - Less vulnerable to weathering
arrow bullet High Stress Crack Resistance - Prevents inching growth of cracks
arrow bullet Excellent Fusion Capabilities. - Ease of installation and movement
arrow bullet Low density, Low weight - Quick installation and transportation
arrow bullet Homogenous structure - Aesthetically superior pipelines
arrow bullet Good elasticity - Reduces number of fittings & eases installation
arrow bullet Non Toxic, Food Grade - Can be used in food and pharma industry
arrow bullet Smooth Inner surface - Low frictional loss & deposition, increased flow
arrow bullet Good Thermal insulation - Excellent for use in hot and cold water systems
arrow bullet Very good fatigue resistance - Possesses integral-hinge property
arrow bullet Excellent dielectric properties - Safe even under water with no performance loss