Polypropylene, abbreviated as PP, is commonly known as fold-resistant plastic.
- Isotactic PP: Crystallinity is as high as 95% or above, with a molecular weight of 80,000–150,000.
- Atactic PP: Amorphous at room temperature, with a molecular weight of 3,000–10,000, and has limited applications.
a. Non-toxic, odorless, tasteless, presented as translucent or transparent granules (milky white in powder form).
b. Density: 0.90–0.91g/cm³.
c. Water stability: Water absorption rate is only 0.01% after 24 hours of immersion in water.
d. Molecular weight: Ranging from 80,000 to 150,000.
e. Good moldability with high shrinkage rate; thick-walled products tend to sink.
f. Excellent gloss and easy to color.
a. High crystallinity and regular structure: Higher strength, hardness and elasticity than HDPE (High-Density Polyethylene).
b. At room and low temperatures: High structural regularity leads to poor impact strength (impact strength increases with the rise of molecular weight).
c. Flexural fatigue resistance: For example, one-piece living hinges injection-molded from PP can withstand 7×10⁷ times of folding and bending without damage.
d. Dry friction coefficient: Comparable to PA6 (Nylon 6) (inferior to PA6 under oil lubrication).
a. Melting point: 164–170℃.
b. Heat resistance: Capable of sterilization at temperatures above 100℃, and will not deform at 150℃ without external force.
c. Brittleness temperature: -35℃ (inferior to polyethylene in cold resistance).
a. Chemical resistance: Resistant to most chemical reagents except concentrated sulfuric acid and concentrated nitric acid, which can corrode PP.
b. Softening and swelling: Low-molecular-weight aliphatic hydrocarbons, aromatic hydrocarbons, chlorinated hydrocarbons, etc., can cause PP to soften and swell.
(Note: Chemical stability improves with increased crystallinity, making it suitable for manufacturing various chemical pipes and fittings with excellent corrosion resistance.)
a. High-frequency insulation performance: Excellent (almost non-hygroscopic, so insulation performance is not affected by humidity).
b. Dielectric constant: 2.0–2.5 (suitable for electrical insulation products used under heating conditions).
c. Dielectric strength: 40KV/mm.
d. Arc resistance: 130s (high static electricity; prone to aging when in contact with copper).
a. Photo-aging: PP is sensitive to ultraviolet (UV) rays.
b. Thermo-oxidative aging: Heat and oxygen will accelerate the aging process of PP.
PP films are transparent and glossy, with low permeability to water vapor and air, including:
a. Blown films;
b. Cast films (CPP);
c. Biaxially oriented films (BOPP).
Widely used in engineering components for automotive, electrical, machinery, instrumentation, radio, textile, national defense industries, as well as daily necessities, turnover boxes, medical and health equipment, and building materials.
Can be processed into pipes, profiles, monofilaments, fishing ropes, packing straps, binding ropes, woven bags, fibers, composite coatings, sheets, plates, etc. Also applicable for blow-molded hollow products such as various small containers.
Low-foaming products, calcium plastic boards, synthetic wood, laminates, synthetic paper; high-foaming PP can be used as structural foams.
Polypropylene can be modified through filling, reinforcement, blending, copolymerization and cross-linking, with specific modification methods as follows:
- Adding fillers such as calcium carbonate, talc powder and inorganic minerals can improve rigidity, hardness, heat resistance and dimensional stability.
- Adding reinforcing agents like glass fiber, asbestos fiber, mica and glass beads can enhance tensile strength, and improve creep resistance and low-temperature impact resistance.
- Adding elastomers and rubbers can improve impact performance and transparency.
- Adding carbon fiber (CF) can increase strength, especially flexural modulus.
- For other specifications, please contact Aote Technology Development Center.
- Except for the colors specified, all products can be colored according to requirements.
- For glass fiber reinforced grades, long fiber or chopped fiber can be selected as required.
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