PP plastic holder

The Bost PP Plastic Holder offers eco-friendly support and easy-clean storage for your daily needs. Made from durable polypropylene, it ensures long-lasting use while promoting sustainability. Perfect for organizing spaces efficiently with a green approach.

Colour

Black Colour

Dimension

1-300mm

Manufacture method

CNC /Injection molding

Material

PP plastic holder

Tolerance

0.05mm

Certification

ISO9001

Request Sample

Get a free quote

Details

Polypropylene (PP)

Polypropylene (PP), commonly known as "hundred-fold plastic", is abbreviated as PP.

Classification by Crystallinity

Isotactic PP: Crystallinity is as high as over 95%, 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.

Properties and Applications of Polypropylene (PP)

1. Properties of Polypropylene

(1) Physical Properties

a. Non-toxic, odorless, tasteless, semi-transparent or transparent pellets (milky white powder);

b. Density: 0.90–0.91 g/cm³;

c. Water stability: Water absorption rate is only 0.01% after 24 hours in water;

d. Molecular weight: Ranges from 80,000 to 150,000;

e. Good moldability, high shrinkage rate, and thick-walled products are prone to depression;

f. Good gloss and easy to color.

(2) Mechanical Properties

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 increase of molecular weight);

c. Flexural fatigue resistance: For example, an integrated living hinge injection-molded from PP can withstand 7×10⁷ folding and bending cycles without showing signs of damage;

d. Dry friction coefficient: The dry friction coefficient of PP is comparable to that of PA6 (but inferior to PA6 under oil lubrication).

(3) Thermal Properties

a. Melting point: 164–170°C;

b. Heat resistance: Can be sterilized at temperatures above 100°C, and does not deform at 150°C when not subjected to external forces;

c. Brittleness temperature: -35°C (inferior to polyethylene in cold resistance).

(4) Chemical Stability

a. Chemical stability: Resistant to most chemical reagents except concentrated sulfuric acid and concentrated nitric acid, which can corrode it;

b. Softening and swelling: Low-molecular-weight aliphatic hydrocarbons, aromatic hydrocarbons, and chlorinated hydrocarbons can cause PP to soften and swell;

(Note: Chemical stability increases with crystallinity, making PP suitable for manufacturing various chemical pipelines and fittings with excellent corrosion resistance.)

(5) Electrical Properties

a. High-frequency insulation performance: Excellent (PP hardly absorbs water, so its insulation performance is not affected by humidity);

b. Dielectric constant: 2.0–2.5 (for electrical insulation products used under heating);

c. Dielectric strength: 40 kV/mm;

d. Arc resistance: 130 seconds (high static electricity, and prone to aging when in contact with copper).

(6) Weather Resistance

a. Photoaging: PP is sensitive to ultraviolet (UV) radiation;

b. Thermo-oxidative aging: Heat and oxygen can accelerate the aging of PP.

2. Applications of Polypropylene

(1) Film Products

PP film products are transparent and glossy, with low permeability to water vapor and air. Common types include:

a. Blown film;

b. Cast film (CPP);

c. Biaxially oriented film (BOPP).

(2) Injection-Molded Products

Used in engineering parts for automobiles, electrical appliances, machinery, instruments, radio, textiles, and national defense industries; daily necessities; turnover boxes; medical and health equipment; and building materials.

(3) Extruded Products

Can be made into pipes, profiles, monofilaments, fishing ropes, packing straps, binding ropes, woven bags, fibers, composite coatings, sheets, and plates. Blow-molded hollow products include various small containers.

(4) Others

Low-foaming products (e.g., calcium-plastic boards), synthetic wood, laminates, synthetic paper, and high-foaming products (can be used as structural foams).

Modification of Isotactic PP (Molecular Weight: 80,000–150,000)

Polypropylene can be modified through filling, reinforcement, blending, copolymerization, and cross-linking. Specific modification methods are as follows:

Adding fillers such as calcium carbonate, talc powder, and inorganic minerals can improve rigidity, hardness, heat resistance, and dimensional stability;
Adding glass fibers, asbestos fibers, mica, and glass beads can enhance tensile strength and improve creep resistance and low-temperature impact resistance;
Adding elastomers and rubber can improve impact performance and transparency;
Adding carbon fibers (CF) can enhance strength, especially flexural modulus.

Materials and Descriptions

Product Category	Product Description	Applications
High-Transparency PP	High transparency, general impact resistance	Various transparent bottles
	High transparency, high impact resistance	Disposable syringes, food containers
	High transparency, high impact resistance	CD cases, view windows
Reinforced PP	20% barium sulfate (BaSO₄) reinforced, high gloss	Appearance parts of small home appliances (rice cooker components, coffee machines, bread makers, electric kettles, microwave containers); medium-strength structural parts, pump housings, water pump impellers (for ultrasonic/thermal spin welding), electrical skeletons, foot pedals, roller skates
	30% barium sulfate (BaSO₄) reinforced, high gloss	Same as above (for scenarios requiring higher strength)
	20% talc (Talc) reinforced, high rigidity	Structural parts requiring high rigidity (e.g., appliance casings, auto parts)
	30% talc (Talc) reinforced, high rigidity	Same as above (for higher rigidity requirements)
	20% calcium carbonate (CaCO₃) reinforced, high rigidity	Cost-effective rigid structural parts (e.g., daily necessities casings)
	30% calcium carbonate (CaCO₃) reinforced, high rigidity	Same as above (for higher rigidity and cost optimization)
	20% glass beads (GS) reinforced, high surface hardness, scratch resistance	Parts requiring surface wear resistance (e.g., instrument panels, auto interior parts)
	30% glass beads (GS) reinforced, high surface hardness, scratch resistance	Same as above (for higher scratch resistance)
	10% glass fiber reinforced, high rigidity	Lightweight rigid parts (e.g., small mechanical components)
	20% glass fiber reinforced, high rigidity, toughened	Structural parts requiring both rigidity and toughness (e.g., auto chassis parts)
	30% glass fiber reinforced, high rigidity, toughened, cold-resistant	High-performance parts for low-temperature environments (e.g., outdoor machinery parts)
Flame-Retardant PP	Flame-retardant (V-0), environmentally friendly, unfilled	Front/rear casings of space heaters, switch parts, capacitor housings, Christmas trees, lamp winding skeletons, electronic/electrical parts, outdoor lighting, areas requiring high temperature resistance
	Flame-retardant (V-0), environmentally friendly, unfilled, toughened	Parts requiring both flame retardancy and impact resistance (e.g., electrical junction boxes)
	Flame-retardant (V-0), environmentally friendly, filled	Cost-effective flame-retardant structural parts (e.g., power distribution cabinet components)
	UV-resistant, flame-retardant (V-0)	Outdoor flame-retardant parts (e.g., outdoor lighting enclosures)
	High heat resistance (RTI140℃), halogen-free, phosphorus-free, flame-retardant, reinforced	High-temperature resistant flame-retardant parts (e.g., high-power electrical components)
Low-Temperature Impact-Resistant PP	Withstands abnormal impact at -10℃, non-flame-retardant	Roller skate parts, handle parts, flame-retardant parts of electrical appliances in high-latitude regions, water tank bodies of toilets
	Withstands abnormal impact at -20℃, non-flame-retardant	Parts for cold regions (e.g., outdoor tool casings)
	Withstands abnormal impact at -30℃, non-flame-retardant	Low-temperature extreme environment parts (e.g., cold-region auto accessories)
	Withstands abnormal impact at -20℃, flame-retardant	Flame-retardant parts for cold regions (e.g., low-temperature electrical enclosures)
Weather-Resistant PP	UV-resistant (outdoor use) + thermo-oxidative aging resistance, high/low-temperature impact resistance	Radomes, casings of outdoor air conditioning units, outdoor billboards, lighting components, indoor/outdoor lamp accessories
	Unfilled, UV-resistant + thermo-oxidative aging resistance	Lightweight outdoor parts (e.g., outdoor decorative parts)
	Filled, UV-resistant + thermo-oxidative aging resistance	Rigid outdoor structural parts (e.g., outdoor furniture components)
	Antistatic, unfilled, UV-resistant + thermo-oxidative aging resistance	Outdoor antistatic parts (e.g., outdoor electronic device casings)
	Filled, UV-resistant + thermo-oxidative aging resistance + light-shielding grade	Outdoor light-shielding parts (e.g., outdoor battery casings)

Notes

For other specifications, please contact the BOST Technology Development Center;
Except for products with specified colors, all others can be dyed according to requirements;
For glass fiber-reinforced products, long fibers or chopped fibers can be selected as required.