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Polyimide composites challenge metals
. Compression molds cost about as much as molds for casting metal. Moreover, and even with custom layups, the cost of compression-molded products is on par with cast metals. Still, polyimide laminates have some shortcomings. For one, they can delaminate from fatigue. Furthermore, although the directional...
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Laminated Plastics
, as they are in a machined part. The molded-macerated method is used for similar parts that require uniform strength properties in all directions. Other common forms of laminated plastics are composite sheet laminates that incorporate a third material bonded to one or both surfaces of the laminate. Metals most...
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Light as a feather -- stiff as a board
. The other GMT from Azdel is a first-generation, mineral-filled reinforced composite that can replace SMCs in nonappearance structural applications. Traditional GMT composites are generally flow molded in a compression press and weigh 4,000 to 4,900 gm/m for thicknesses on the order of 2.5 mm...
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Epoxy
and fatigue resistance. Epoxies have excellent electrical, thermal, and chemical resistance. Their strength can be further increased with fibrous reinforcement or mineral fillers. The variety of combinations of epoxy resins and reinforcements provides a wide latitude in properties obtainable in molded...
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More than a soft touch and a pretty face
, in a profession that prides itself on caution and precision, critical components would see no untried material. But designers jumped at the opportunity to evaluate new plastics that could give aesthetics over those possible from metal or composites. This was especially true where molded-in-color could replace...
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Secrets of Bond Strength
the maximum strength and long-term resistance to deterioration is through a chemical or electrolytic pretreatment, particularly on thermoset and thermoplastic surfaces. Molded, cast, and laminated parts made f rom thermos et plastics such as glass-reinforced epoxy (GRE), glass and carbon-reinforced...
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Advancing the art of moldmaking
parts from production plastics. Getting working prototype parts in days let a vacuumcleaner motor maker turn out working models of a new design in a week. What's more, engineers at Ametek Inc., Paoli, Pa., received injection-molded parts in Rynite, a material strong enough to survive the heat...
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Metrigraphics Article in Today's Medical Developments
of using an implantable-grade PEEK is it replaces higher-cost metals and the high cost of machining other thermoplastic materials, says Riemer. And we can push design boundaries with molded components versus machined components, he adds. Disappearing tissue scaffolding. Biofelt is a proprietary...
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The Influence of Sealant Modulus on the Bending Stiffness of Multilayer Films (.pdf)
10-40 25-41. LLDPE MPa 260-520 280-550 260-520. kpsi 38-75 40-80 38-75. EVA MPa. 48-200. kpsi. 7-29. EMA MPa. 83. kpsi. 12. Ionomer MPa 140-410 140-410. a=dry as molded (about 0.2% moisture). b=conditioned (50% RH). Table 2. Tensile (Secant) Modulus of Some Films. Film MPa kpsi Source. Aluminum Foil...
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GE brings more good resins to life
Film is a high gloss and colorfast polycarbonate (PC) that was developed as an automotive paint replacement. It is back molded with Lexan or Xenoy resins using common in-mold decoration techniques and reportedly is the only material that combines 10-yr gloss retention with chemical and scratch...