Plastic-Customized Products

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Plastic injection molding utilizes thermal energy to heat raw materials to a molten state. The molten plastic is then injected into molds, and the cooling system is employed to solidify the material, ultimately yielding the final product. Molds can be equipped with sliding mechanisms, making them suitable for the production of structurally complex items.
In addition to the inherent characteristics of the raw materials, various material combinations with different percentages can create "Modified plastics (Composite plastics)" enhancing the product's rigidity or toughness. For example, Nylon+Glass Fibers, POM+PTFE, TPR+TPV, and so forth.
Furthermore, we provide Insert molding (metal parts) and overmolding, such as the application of a first layer of PP and a second layer of TPR material.
SPPIA recommends suitable materials based on the product's usage environment and customer demands, serving a wide range of industries, including horticulture industry, water hardware industry, toolbox manufacturers, construction hardware industry, curtain industry, textile equipment manufacturers, extreme sports industry, airsoft manufacturers, household goods and so on.

SPPIA-general plastic and engineering plastic

Plastic injection falls under the category of "Thermoplastic plastics" and can be further classified into general plastics, engineering plastics, and advanced engineering plastics.
General plastics: Suitable for daily necessities, they exhibit temperature resistance of approximately 100°C or below.
Engineering plastics: Possessing characteristics such as abrasion resistance and chemical resistance, these plastics can withstand temperatures ranging from approximately 100 to 150°C.
Advanced engineering plastics: Demonstrating excellent chemical resistance and heat resistance, these plastics can endure temperatures ranging from approximately 150 to 300°C.
Plastics are polymers with a monomeric molecular structure, giving rise to both "Amorphous" and "Crystalline" plastic materials based on their structure and properties.

Amorphous Crystalline
Molecular chain Random and jumbled Organized and oriented
Shrinkage Lower Higher
Transparency Higher Lower
Feature High impact resistance Higher heat resistance and chemical resistance

General plastics

Raw material Advantage Disadvantage Application
ABS 1. High surface brightness and excellent surface aspect

2. Excellent impact resistance

3. High dimensional stability
1. Poor weathering resistance

2. Poor solvent resistance
Electronic housings, auto parts, consumer products, pipe fittings, toys, curtain accessories and faucet accessories
PP 1. Lightest polymers

2. Good impact resistance

3. Excellent fatigue resistance and elasticity
1. Susceptible to uv degradation and oxidation
2. Not easy to be recycled
Labels, food packaging, closures, crates, bottles, housewares, furniture, luggage, battery cases and trays, bumpers, fender liners, interior trim, instrument panels and door trims
PE 1. Chemical resistance
2. Low water absorption
3. Excellent electrical insulating properties
1. Susceptible to stress cracking

2. Poor uv- and low heat resistance
Packaging film, agricultural mulch, manufacturing containers, squeeze bottles, toys, tubing, tamper evident, plastic bags for computer components, housewares, laboratory equipment, trash and grocery bags, wire and cable insulation
PS 1. Ease of printing and labeling
2. Chemical resistance
3. Clarity or translucency is desirable
1. Susceptible to stress cracking
2. Not easy to be recycled
Disposable cups and plates, takeout containers, insulation boards, petri dishes, insulating walls and roofs
1. Clarity and transparency
2. Good toughness and impact resistance
3. Chemical resistance
1. Brittleness

2. Affecting its appearance and properties over time in outdoor applications
Transparent food containers, clear electronic device cases, cosmetic packaging, automotive interior parts and lighting components
PMMA 1. Optical clarity
2. Impact resistance
3. Weather resistance
1. Brittleness
2. Scratch sensitivity
Optical lenses, automotive headlights and tail lights, aquariums and fish tanks, lighting fixtures, cosmetic packaging and light guide panels in lcd screens

Engineering plastics
Raw material Advantage Disadvantage Application
PC 1. Excellent optical clarity
2. Well strength and impact resistance
3. Good heat resistance
1. Not suitable for food contact
2. Chemical sensitivity
Safety equipment, optical lenses, electrical and electronic components, medical devices and sporting goods
PPO 1. Flame retardancy
2. Electrical insulation properties
3. High strength and stiffness
1. Limited uv resistance
2. Notch sensitivity
Electrical and electronic components, automotive parts, appliance housings, water filtration systems and medical devices
1. High strength and durability
2. Excellent wear resistance
3. Electrical insulation properties
1. Moisture absorption
2. Poor resistance to alkalis
Bicycle accessories, gears, bearings, cable ties and gardening accessories
POM 1. High mechanical strength
2. Low friction and wear resistance
3. Good electrical insulation properties
1. Limited resistance to strong acids
2. Limited uv resistance
Gears, bearings, rollers, switches, connectors, insulators, housings, components, pump parts and conveyor system components
PET 1. Shatter resistance
2. Barrier properties
3. Clarity and transparency
1. Limited heat resistance
2. Hygroscopic nature
Beverage bottles, food containers, cosmetic and personal care packaging and disposable cups/ plates

Thermoplastic elastomer(TPE)
Raw material Advantage Disadvantage Application
TPR 1. Excellent flexibility and elasticity
2. Providing a rubber-like feel
3. Wide range of hardness
1. Not suitable for harsh chemical environments
2. Poor weathering resistance
Footwear, grips and handles, seals, gaskets, medical products, kitchen utensils, garden tools and cleaning equipment
TPEE 1. High tensile strength and tear resistance
2. Well temperature resistance
3. Resistance to oils and solvents
1. Poor weathering resistance

2. Poor chemical resistance
Seals, gaskets, hoses, weatherstripping, handles, grips, and overmolded parts for tools, kitchen utensils, electronic devices, cable insulation, connectors, grommets and protective covers
TPV 1. Good compression set
2. Wide temperature range
3. Weathering resistance
1. Flow marks are prone to occur
2. Poor wear resistance
Weather seals, door gaskets, wire and cable insulation, dashboards, instrument panels and medical tubing and seals
TPA 1. Well toughness
2. Good oil resistance
3. Well wear resistance
1. Weaker elasticity
2. Prone to discoloration during high-temperature processing
Sport goods, automotive and industrial parts
TPO 1. Well weather resistance
2. Well chemical resistance
3. Ease of processing
1. Not suitable for high-load applications
2. Thermal expansion
Roofing membranes, shoe soles, bumpers, body panels and fenders
TPU 1. Excellent abrasion resistance
2. Well toughness
3. Oil resistance
1. Poor weathering resistance

2. Hydrolysis sensitivity
Phone cases, rollers, fitness bands and smartwatch straps, medical tubing and catheters, armrests, dashboard covers and seat trim

Modified plastics (Composite plastics)
Raw material Feature Application
POM + PTFE Reducing friction coefficient Conveyor components
Nylon + Glass Fiber Increasing structural strength and rigidity Textile machine spare parts, silicone guns, Airsoft accessories
Nylon + MoS2 Reducing friction coefficient Machine equipment accessories
PP + Glass Fiber Increasing structural strength and rigidity Plastic fixing plate
POM + Glass Fiber Increasing structural strength and rigidity Airsoft accessories
TPR + TPV Reducing deformation Handles
We also offer other materials and composite options, kindly contact us.