Plastic Injection Moulding Service

Injection Molding Process

The injection molding process requires an injection molding machine, plastic raw materials and processing molds. The plastic raw materials are first melted into liquid in the injection molding unit, then injected into the mold (basically made of steel or aluminum), and then cooled and solidified into the final plastic part.

Design For Moulding

Several factors such as wall thickness, draft angles and corner radii, can affect the quality of the final injection moulded part and the repeatability of the process. For better part quality, learn to design for the process here.

Discover Design Guide

Typical Plastic Injection Moulding Finishing Options

Name	Service	Applicable to	Machining Mark
SPI Mould Finishes	All		SPI A1-3, B1-3, C1-3, D1-D3. Read the Guide to SPI finishes.
Painting	All	Black, Pantone/RAL colours	Painting is a method of adding colour to a part. It is often used to increase the aesthetics of a part.
Chrome Plating	All	Silver-gray metallic	Chrome plating is used to increase corrosion resistance or surface hardness of a part, ease the maintenance process or for purely decorative purposes.

Injection Moulding Tolerances Guide

Grade Size	0.5-3mm	3-6mm	6-30mm	30-120mm	120-400mm	400-1000mm	1000-2000mm	2000-4000mm
Fine	0.05	0.05	0.1	0.15	0.2	0.3	0.5	/
Medium	0.1	0.1	0.2	0.3	0.5	0.8	1.2	2

Injection materials

HDPE

PVC

PET

HDPE

HDPE is a low-cost thermoplastic known for its excellent impact strength and chemical resistance.It is widely used in applications such as plastic bottles, cutting boards, and piping.

Appearance

Black, white, or translucent.

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PA (Polyamide) or polyamide, is an engineering thermoplastic characterized by high mechanical strength, thermal stability, and excellent resistance to wear and abrasion. It is commonly utilized in high-performance applications such as gears, bearings, and structural components in automotive and aerospace industries.

Appearance
Typically opaque, available in natural (off-white), black, or custom-engineered colors.

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PVC

PVC (Polyvinyl Chloride) is a versatile thermoplastic polymer with superior chemical resistance, flame retardancy, and electrical insulation properties. It is extensively employed in construction (pipes, profiles), medical devices (tubing), and electrical cable insulation.

Appearance
Rigid or flexible forms, commonly white, gray, or transparent, depending on additives and processing.

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PE (Polyethylene) is a semi-crystalline thermoplastic known for its excellent chemical resistance, low moisture absorption, and high impact strength. It is widely used in packaging films, gas and water piping systems, and industrial liners due to its durability and cost-effectiveness.

Appearance
Translucent to opaque, available in natural (milky white), black, or custom pigmented variants.

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PP (Polypropylene) is a semi-crystalline thermoplastic with exceptional chemical resistance, high fatigue strength, and excellent thermal stability. It is commonly applied in automotive components, medical devices, and food packaging due to its versatility and recyclability.

Appearance
Translucent to opaque, typically white, black, or engineered in various colors for specific applications.

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PET

PET (Polyethylene Terephthalate) is a high-performance thermoplastic polyester with outstanding mechanical properties, clarity, and barrier resistance to gases and moisture. It is predominantly used in beverage bottles, food packaging, and synthetic fibers for textiles.

Appearance
Transparent or opaque, often clear or custom-colored for packaging and industrial applications.

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Injection Molding FAQ

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What is the injection molding

Injection moulding is a manufacturing process. Thermoplastic or thermosetting polymers, in granular form, are heated until molten. The liquid material is then injected, under high pressure, into a custom-designed mould cavity. After cooling and solidifying, the part takes the precise shape of the mould, enabling mass production of complex plastic items.

How long can injection molding be finished?

Injection Molds Time: The manufacturing time of injection molds depends on complexity. Simple ones may take 1 - 2 weeks, while intricate, multi cavity molds can need 4 - 8 weeks.

Small-scale Production: it typically takes a few days to a couple of weeks.

Large-scale production: with more processes, may span weeks to months.

Advantages of Injection Moulding

● Economical

● Highly efficient and dependable

● Utilizes production-grade materials

● Offers versatility (in materials and colors)

● Produces high-quality components