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What is Polypropylene?

The Definitive Guide to Polypropylene (PP)

What is Polypropylene (PP) is an unbending and glasslike thermoplastic utilized generally in ordinary items like bundling plate, family items, battery cases, clinical gadgets, and so forth Investigate this exhaustive guide and learn all that you need to think about this broadly utilized thermoplastic.


What is Polypropylene and What It's Used for?

How to Produce Polypropylene?

Kinds of Polypropylene and their Benefits

Material Properties of Polypropylene

How added substances assist with further developing PP properties?

The convenience of Polypropylene Films

Examination of Polypropylene with Polyethylene

Polypropylene Processing Conditions

Is PP harmful? How to reuse PP?

Key Applications

Key Properties



What is Polypropylene and What It's Used for?

Polypropylene is an intense, unbending and glasslike thermoplastic delivered from propene (or propylene) monomer. It is a direct hydrocarbon gum. The compound recipe of polypropylene is (C3H6)n. PP is among the least expensive plastics accessible today.

Sub-atomic Structure of Polypropylene

Sub-atomic Structure of Polypropylene

PP has a place with polyolefin group of polymers and is one of the main three broadly utilized polymers today. Polypropylene has applications both as a plastic and a fiber in:

Auto Industry

Modern Applications

Buyer Goods, and

Furniture Market

It has the most minimal thickness among item plastics.

Realities to KnowPolypropylene was first polymerized by German scientist named Karl Rehn and an Italian scientific expert named Giulio Natta to a translucent isotactic polymer in 1954. This disclosure before long prompted an enormous scope creation of polypropylene beginning in 1957 by the Italian firm Montecatini.

Syndiotactic polypropylene was likewise first blended by Natta and his associates.

How to Produce Polypropylene?

Nowadays, polypropylene is produced using polymerization of propene monomer (an unsaturated natural compound - synthetic equation C3H6) by:

Ziegler-Natta polymerization or

Metallocene catalysis polymerization

Design of PP Monomer

Design of PP Monomer

C3H6 Ziegler-Natta Polymerization


Or on the other hand Metallocene Catalysis Structure of Polypropylene

Design of Polypropylene


Upon polymerization, PP can frame three essential chain structures relying upon the situation of the methyl gatherings:

Atactic (aPP) - Irregular methyl bunch (CH3) game plan

Isotactic (iPP) – Methyl gatherings (CH3) masterminded on one side of the carbon chain

Syndiotactic (sPP) - Alternating methyl bunch (CH3) game plan

Kinds of Polypropylene

Kinds of Polypropylene and their Benefits

Homopolymers and Copolymers are the two significant kinds of polypropylene accessible on the lookout.

Polypropylene Homopolymer is the most broadly used universally useful level. It contains just propylene monomer in a semi-translucent strong structure. Primary applications incorporate bundling, materials, medical services, pipes, car and electrical applications.

Polypropylene Copolymer family is additionally separated into irregular copolymers and square copolymers delivered by polymerizing of propene and ethane:

Polypropylene Random Copolymer is created by polymerizing together ethene and propene. It highlights Ethene units, normally up to 6% by mass, joined arbitrarily in the polypropylene chains. These polymers are adaptable and optically clear making them appropriate for applications requiring straightforwardness and for items requiring a brilliant appearance.

While in Polypropylene Block Copolymer, ethene content is bigger (somewhere in the range of 5 and 15%). It has co-monomer units masterminded in ordinary example (or squares). The normal example henceforth makes thermoplastic harder and less fragile than the arbitrary co-polymer. These polymers are appropriate for applications requiring high strength, like modern utilizations.

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Polypropylene, Impact Copolymer – Propylene Homopolymer containing a co-blended Propylene Random Copolymer stage which has an ethylene content of 45-65% is alluded to PP sway copolymer. It is valuable in parts which require great effect obstruction. Effect copolymers are primarily utilized in bundling, houseware, film, and line applications, just as in the auto and electrical fragments.

Extended Polypropylene - It is a shut cell dab froth with super low thickness. EPP is utilized to create three-dimensional polymer froth items. EPP dab froth has higher solidarity to weight proportion, incredible effect opposition, warm protection, and substance and water obstruction. EPP is utilized in different applications going from autos to bundling, from development items to buyer products and then some.

Polypropylene Terpolymer - It is created by propylene fragments joined by monomers ethylene and butane (co-monomer) which show up arbitrarily all through the polymer chain. PP terpolymer has preferable straightforwardness over PP homo. Additionally, the fuse of co-monomers diminishes glasslike consistency in the polymer making it appropriate for fixing film applications.

Polypropylene, High Melt Strength (HMS PP)– It is a long chain spread material, which joins both high dissolve strength and extensibility in the liquefy stage. PP HMS grades have a wide mechanical property range, high warmth security, great compound opposition. HMS PP is generally used to create delicate, low thickness froths for food bundling applications just as utilized in auto and development businesses


Modified Proctor Test

Modified Proctor Test is performed to know the characteristics of soil through compaction with change in water content ultimately giving us the relation between dry density and moisture content. It is a modified version of the Standard Proctor Test.