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Plastics
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Characteristics
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Common Grades
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 ABS
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High toughness, easy to machine, and stable forming.
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Prototypes, aesthetic housings, and functional validation parts.
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 PC (Polycarbonate)
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Optical transparency, high toughness, and impact resistance.
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Transparent components, protective covers, and jig/fixture housings.
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 POM (Delrin/Acetal)
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Low friction coefficient, high wear resistance, and excellent dimensional stability.
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Sliders, gears, bushings, and moving structural parts.
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 PA (Nylon)
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High toughness, wear resistance, and heat resistance
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Fasteners, load-bearing components, and industrial machinery parts.
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 PEEK
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High-temperature resistance, superior chemical resistance, and extreme mechanical performance.
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Aerospace, medical, and high-end precision engineering.
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 PMMA (Acrylic)
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High transparency and excellent visual clarity.
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Light covers, windows, and display-grade structural parts.
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Custom Injection Molded Parts We Manufacture
Plastic Housings and Enclosures
Keywin manufactures custom plastic housings and enclosures for electronic equipment, industrial controls, automation systems, and machinery.
We review wall thickness, mounting features, snap fits, openings, and assembly interfaces to help achieve suitable part geometry and consistent production quality.
Industrial Functional Components
We produce custom molded brackets, connectors, gears, bushings, sliders, and protective components for industrial equipment.
Depending on the application, material selection and mold design can be adjusted to support mechanical strength, wear resistance, and dimensional stability.
Insert-Molded Components
For parts requiring embedded metal hardware, insert molding can integrate plastic and metal components into one molded assembly.
This approach can reduce separate fastening operations and simplify product assembly when the design and material combination are suitable.
Overmolded Products
We support multi-material molded components requiring improved grip, protective surfaces, or combined material functions.
Typical examples include handles, grips, protective interfaces, and selected industrial connectors.
Mold Design and Engineering Support
Mold design has a direct influence on injection molding quality, dimensional accuracy, cycle time, and production cost.
Keywin reviews part geometry and moldability before tooling begins.
Wall Thickness and Material Flow
Uneven wall thickness can contribute to sink marks, warpage, and inconsistent cooling. We review wall sections and material flow to identify potential design improvements.
Draft Angles and Part Release
Suitable draft angles help molded parts release from the mold without excessive friction, surface damage, or ejection problems.
Gate Location and Weld Lines
Gate placement influences material flow, weld-line position, packing pressure, and cosmetic appearance. We evaluate these factors according to the component's functional and visual requirements.
Cooling and Shrinkage Compensation
Plastic shrinkage varies by resin, part geometry, and processing conditions. Mold cooling and shrinkage compensation are considered during tooling design to improve dimensional consistency.
Mold Flow Analysis
For suitable projects, mold flow analysis can help evaluate filling behavior, potential air traps, weld lines, and warpage risks before the mold is manufactured.
Early design review helps reduce tooling modifications and supports a smoother transition from prototype approval to production.
