Polypropylene (PP)

Product Information

Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat-resistant. It is a white, mechanically rugged material and has a high chemical resistance. Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases. The properties of polypropylene depend on the molecular weight and molecular weight distribution, crystallinity, type and proportion of comonomer (if used) and the isotacticity. In isotactic polypropylene, for example, the methyl groups are oriented on one side of the carbon backbone. This arrangement creates a greater degree of crystallinity and results in a stiffer material that is more resistant to creep than both atactic polypropylene and polyethylene Bio-PP is the bio-based counterpart of polypropylene (PP). Polypropylene is the second-most widely produced commodity plastic (after polyethylene).

Synonyms

Poly(1-methylethylene), Polypropylene; Polypropene;Polipropene 25 [USAN]; Propene polymers;Propylene polymers; 1-Propene; [-Ch2-Ch(Ch3)-]n

PP Specification

Size：customized

Purity: customized

Per your request or drawing

We can customized as required

Properties（Theoretical）

Chemical Resistance

Specific Properties

Dielectric Strength @25µm thick ( kV   mm⁻¹ )	200
Dissipation Factor @1MHz	0.0003
Elongation at break ( % )	50.0 -200.0
Initial Tear Strength ( g µm⁻¹ )	18 - 27
Permeability to Carbon Dioxide @25C (   x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	6 @ 30C
Permeability to Hydrogen @25C ( x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	30
Permeability to Nitrogen @25C ( x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	0
Permeability to Oxygen @25C ( x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	2 @30C
Permeability to Water @25C ( x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	16
Permeability to Water @38C ( x10⁻¹³ cm³. cm cm⁻² s⁻¹ Pa⁻¹ )	70
Heat-sealing     Temperature ( C )	140 - 205

Applications of PP

As polypropylene is resistant to fatigue, most plastic living hinges, such as those on flip-top bottles, are made from this material. However, it is important to ensure that chain molecules are oriented across the hinge to maximise strength. Polypropylene is used in the manufacturing of piping systems, both ones concerned with high purity and ones designed for strength and rigidity (e.g., those intended for use in potable plumbing, hydronic heating and cooling, and reclaimed water). This material is often chosen for its resistance to corrosion and chemical leaching, its resilience against most forms of physical damage, including impact and freezing, its environmental benefits, and its ability to be joined by heat fusion rather than gluing.

Many plastic items for medical or laboratory use can be made from polypropylene because it can withstand the heat in an autoclave. Its heat resistance also enables it to be used as the manufacturing material of consumer-grade kettles[citation needed]. Food containers made from it will not melt in the dishwasher, and do not melt during industrial hot filling processes. For this reason, most plastic tubs for dairy products are polypropylene sealed with aluminum foil (both heat-resistant materials). After the product has cooled, the tubs are often given lids made of a less heat-resistant material, such as LDPE or polystyrene. Such containers provide a good hands-on example of the difference in modulus, since the rubbery (softer, more flexible) feeling of LDPE with respect to polypropylene of the same thickness is readily apparent. Rugged, translucent, reusable plastic containers made in a wide variety of shapes and sizes for consumers from various companies such as Rubbermaid and Sterilite are commonly made of polypropylene, although the lids are often made of somewhat more flexible LDPE so they can snap onto the container to close it. Polypropylene can also be made into disposable bottles to contain liquid, powdered, or similar consumer products, although HDPE and polyethylene terephthalate are commonly also used to make bottles. Plastic pails, car batteries, wastebaskets, pharmacy prescription bottles, cooler containers, dishes and pitchers are often made of polypropylene or HDPE, both of which commonly have rather similar appearance, feel, and properties at ambient temperature. A diversity of medical devices are made from PP

Packing of PP

Standard Packing:

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes Special package is available on request.

ATTs’ PP is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.

Chemical Identifiers