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  • Custom Online Injection Molding Service

    Quickly move from plastic molded prototypes to high-quality custom production parts. Get bulk pricing & DFM in 1 day. 30+ thermoplastic, thermoset materials.
    Free quote with DFM feedback
    No MOQ
    0.05mm mold tolerance
    T1 sample as fast as 2 weeks

    Our Custom Injection Molding Services

    Utilizing Breton Precision injection molding solutions in China, we shape plastic parts based on part size, intricacy, and volume requirements. On-demand prototypes and production runs are made possible with machines ranging from 30t to 1800t, ensuring every design’s accuracy. Benefit from free design consulation on each injection molding order. Expect quick turnarounds with lead times as short as 15 days.


    Injection Mold Tooling

    Injection molds are crucial for mass-producing precise plastic molded parts. Made primarily from steel or aluminum, their creation involves intricate design, precise machining, and assembly.

    Plastic Injection Molding

    Plastic injection molding is a technique where molten thermplastic is forced into molds, solidifying into parts. Enabling efficient, and large-scale production with consistent quality.


    Overmolding combines different plastic materials by molding one over another, enhancing functionality, aesthetics, and grip, while reducing assembly time and costs.

    Insert Molding

    Insert molding encases a pre-set insert with plastic, merging metal and plastic, enhancing strength, simplifying assembly, and ensuring precision integration.

    Injection Molding Materials

    Breton Precision offers common metals for injection molding tooling, and a variety of popular plastic materials.


    Injection Mold Tooling Materials

    Before injection molding process starts low or high-volume production, a high tolerance CNC machined tooling is needed. Most commonly used materials include:
    Tool Steel: P20, H13, S7, NAK80, S136, S136H, 718, 718H,  738
    Stainless Steel:
    420, NAK80, S136, 316L, 316, 301, 303, 304
    Aluminum: 6061, 5052, 7075


    Plastic injection molding service comes with a wide range of materials with different properties, including impact strength, rigidity, thermal resistance, chemical resistance, etc.
    ABS   HDPE   LDPE      PP
    PPA   PS        POM      PC
    PU     Teflon (PTFE)   Nylon
    PC     PMMA   PA        PEEK



    Several thermoset materials for distinct applications due to their unique bonding properties.

    Liquid Silicone Rubber




    Injection Mold Surface Finishes

    We primarily offers SPI finishes for plastic injection molds. For VDI textures, specify your requirements when submitting your quote on our platform.

    SPI Finish Standards

    Surface Roughness RA (mm)

    Finishing Method


    Steels Recommended

    SPI A1

    0.012 to 0.025

    6000 Grit Diamond

    Super High Glossy finish

    S136 (54HRC) or 8407(52HRC)

    SPI A2

    0.012 to 0.025

    3000 Grit Diamond

    High Glossy finish

    S136 (54HRC) or 8407(52HRC)

    SPI A3

    0.05 to 0.10

    1200 Grit Diamond

    Normal Glossy finish

    S136 (300HB) or 718H

    SPI B1

    0.05 to 0.10

    600 Grit Paper

    Fine Semi-glossy finish


    SPI B2

    0.10 to 0.15

    400 Grit Paper

    Medium Semi-glossy finish


    SPI B3

    0.28 to 0.32

    320 Grit Paper

    Normal Semi-glossy finish


    SPI C1

    0.35 to 0.40

    600 Grit Stone

    Fine Matte finish


    SPI C2

    0.45 to 0.55

    400 Grit Stone

    Medium Matte finish


    SPI C3

    0.63 to 0.70

    320 Grit Stone

    Normal Matte finish


    SPI D1

    0.80 to 1.00

    Dry Blast Glass Bead

    Satin Textured finish


    SPI D2

    1.00 to 2.80​

    Dry Blast

    Dull Textured finish


    SPI D3

    3.20 to 18.0

    Dry Blast

    Rough Textured finish


    Classes of Injection Mold

    We adhere to the five standard categories of SPI mold classifications from Class 101 to 105, aligning expectations for customers and suppliers alike.

    Mold Class

    Production Level





    Lead Time

    Class 105

    Very low

    Less than 500 cycles

    Prototype testing

    ±  0.02mm

    Inexpensive to produce a very limited number of product prototypes

    7-10 days

    Class 104


    Less than 100K cycles

    Good for limited-production parts with non-abrasive materials

    ±  0.02mm

    Fall within low to moderate price ranges 

    10-15 days

    Class 103



    Less than 500K cycles

    For low to medium-production parts

    ±  0.02mm

    Fall within common price ranges 

    10-15 days

    Class 102

    Medium to high

    Less than 1M

    Good for parts with abrasive materials and/or tight tolerances

    ±  0.02mm

    Fairly high price and made with materials of high quality

    10-15 days

    Class 101

    Extremely high

    Over 1M cycles

    Extremely high production and fast cycle times

    ±  0.02mm

    Highest price and made with only the highest quality materials 

    10-18 days

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