Resin Puzzle Key. (763)

Transcription

1 Resin Puzzle Key (763)

2 Your sample resin cube has been designed to illustrate nine of the most common thermoplastics used in rapid injection molding. Each of these resins has unique properties as summarized on in this booklet. Assembly, however, is required (and good luck with that). For the puzzle-impaired, we have included a very cool animated solution on our website at Technical information for these generic materials is available for free from IDES The Plastics Web at Order rapid injection molded parts online at It s easy, and your detailed, interactive ProtoQuote will amaze you.

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4 1 HDPE High Density Polyethylene. Pros: Impact, and wear resistant. Flexible, can have very high elongation before breaking. Generally good chemical resistance. Cons: Sensitive to thick sections in your part. It may have voids, bubbles or sink. Poor dimensional accuracy. Low mechanical and thermal properties. Price is low to very low. 2 PP Polypropylene. Pros: Impact (some grades) and wear resistant. Flexible, can have very high elongation before breaking. Resistant to acids and bases. Cons: It is sensitive to thick sections in your part which may cause voids, bubbles or sink. Poor dimensional accuracy. Low mechanical and thermal properties. Poor resistance to organic solvents. Price is low to very low.

5 3 ABS Acrylonitrile Butadiene Styrene. Pros: Excellent impact resistance. It can have good appearance for cosmetic parts. Strength is moderate. Good resistance to acids and bases. Cons: It is sensitive to thick sections in your part which may cause voids, bubbles or sink. Attacked by hydrocarbons and organic solvents. Heat resistance is low. Price is low to moderate. 4 PC/ABS Polycarbonate/Acrylonitrile Butadiene Styrene blend. Pros: Excellent impact resistance. Excellent dimensional stability. Good strength. Good cosmetics. Good resistance to acids and bases. Cons: It is sensitive to thick sections in your part which may cause voids, bubbles or sink. Poor resistance to organics and hydrocarbons. Price is moderate.

6 5 POM Acetal (polyoxymethylene). Pros: High strength, good lubricity and resistance to hydrocarbons and organic solvents. Acetal machines well. Cons: Sensitive to thick sections and nonuniform part geometry. It may have voids, excess shrink or warp. Poor resistance to acids and bases. Price is average to high. 6 PBT Polybutylene Terephthalate (member of polyester family). Pros: Good electrical properties for power components. Moderate to high strength depending on glass fill. Unfilled grades tough and flexible. Good resistance to organic solvents and fuels. Cons: Hard to fill thin parts. Glass filled resins very prone to warp. Poor resistance to acids, bases and hydrocarbons. Price is moderate.

7 7 PA66 GF33 nylon with 33% glass fiber fill (polyamide). Pros: High strength over wide temperature range, up to 450 F (232 C). Chemical resistant except strong acids or bases. Cons: Parts are subject to warp due the shrink difference parallel and perpendicular to fill and a high shrink base resin. Molded parts in your application can absorb moisture, changing dimensions and mechanical properties. Price is moderate to high. 8 PA 66 nylon (polyamide). Pros: High strength. Chemical resistant except strong acids or bases. Flows well, good for thin part geometry. Cons: Parts are more subject to warp due to nonlinear shrink. Molded parts in your application can absorb moisture, changing dimensions and mechanical properties. Price is moderate to high.

8 9 PC Polycarbonate. Pros: Excellent impact resistance and strength at low and high temperatures. Available in visually clear grades. Good heat strength. Cons: It is sensitive to thick sections in your part which may cause voids, bubbles or sink. Fair to poor chemical resistance which can cause stress cracking or opaque dulling of the surface. Price is moderate to high. Note: These descriptions are general and relative. You will need to obtain manufacturer s data on resins you wish to use and make your own determination of suitability for your application. (763)