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Plastic Injection Molding Materials

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Molding Material Selection

Plastic molding material selection can dramatically affect your plastic part's tensile strength, temperature resistance, appearance, life-span, and production cost.

Our vast and always current knowledge of commodity through high-temperature thermoplastic and thermoset materials—including resins and Liquid Silicone Rubber (LSR)—will prove crucial for expediting the plastic molded part material selection process.

Plastic Injection Molding Materials

Partial Thermoplastics and Thermoset Raw Materials Overview:

IMPORTANT: Information below is a general materials description overview, and is intended for preliminary material identification ONLY.

ABS (Acrylanitrile Butadiene Styrene)

Amorphous polymer that’s easy to work with. Good impact strength and appearance. Poor chemical resistance. Commonly used in: computer shells, medical parts, hand-held appliances, auto trim parts. Flame retardant and medical grade available.

ABS (Polycarbonate Alloy)

Stronger than ABS. Exceptional impact strength at low temperatures. Flame retardant grades available. Less expensive than Polycarbonate. Limited availability due to worldwide shortage.

Acetal (POM)

Acetal Polymers that are semi-crystalline and have excellent fatigue resistance, lubricity, and chemical resistance. Can omit gasses at higher temperatures. Brittle at lower temperatures. Enhanced lubrication and glass-filled grades available.

PMMA, Acrylic

Amorphous polymers offering superb clarity. Used in optical applications. Excellent weather durability for outdoor applications.

Nylon 6

Semi-crystalline polymer with low cost and high performance versatility and the lowest modulus of all nylon. Lower grades subject to property change if exposed to moisture. Can be reinforced with compounds and additives to expand property range.

Nylon 6-6

Improved properties over Nylon 6. H3 abrasion resistance. Glass fiber reinforcement grades used for metal replacement.

Nylon 11

Less susceptible to moisture absorption that Nylon 6 and 6-6. Compounded with reinforcements and additives to increase property stability and range including impact strength, flexibility, and dimensional stability.

PBT Polyester

(Polybutylene Terepthalate)

Versatile, semi-crystalline materials with broad property range. Performance similar to Nylon. Resists abrasion, temperature, moisture. Effective electrical barrier with superb impact strength. Subject to failure if notched under stress. Difficult to mold to extremely tight tolerances.

LCP (Polyester Liquid Crystal Polymer)

Material made of polymer molecules with tensile strength and modulus close to aluminum. Molecular orientation causes structural strength to be only inherent in the outermost skin layers, presenting design and molding challenges.

PP, Polypropylene

Semi-crystalline material. Wide range of properties, usage, and cost. Chemical and low- temperature resistant. Difficult to mold to very close tolerances.

PC, Polycarbonate

Amorphous material with superb clarity, impact strength, and mechanical properties. Widely used in optical applications. Medium weather durability. Limited availability.


Available in both amorphous and crystalline grades. Excellent at high temperatures. Susceptible to alkali. Expensive.

PO Modified Polyphenylene Oxide


Amorphous material with properties superior to ABS, although more expensive. Good impact strength, stiffness, surface appearance. Chemical resistant. Flame retardant.

PPS Polyphenylene Sulfide

Semi-crystalline material. Available in a wide range of compounded variations, providing good mechanical properties. Excellent resistance to chemicals and high temperature. Popular and effective bearing material.


Amorphous, temperature-resistant, transparent material with reasonably low cost. Effective at up to 300o F. Can be compounded with glass and minerals.

LSR Liquid Silicone Rubber

Inorganic synthetic elastomer made from a cross-linked silicon-based polymer reinforced with filler. Provides long service life retaining natural flexibility and resilience. Weather resistant, temperature resistant, good electrical insulating qualities, excellent sealing performance, Inert (no taste or smell), range of colors and hardness, excellent flow properties for fabrication.

* (for non-medical products only)

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7 Main Street, Ellington, CT 06029
24 Scitico Road Somers, CT 06071

toll free: 800-788-1984
local: 860-875-2868

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