Page 112 - Engineering Plastics Handbook

86 Engineering Plastics

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technology includes specially developed Delrin grades, Delrin ES,
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Cromax , Centari 6000, and Aqua Decosoft .
The company’s structural bonding technology combines two resin melts
in the mold, such as acetal homopolymer and HDPE, on either side of a
thin nonwoven microporous fabric veil which serves as a tie layer. The poly-
acetal and HDPE penetrate the veil. It is used for molding a fuel tank com-
ponent and is being developed for soft-touch applications.
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DuPont Delrin 560HD resists hot diesel fuel better than standard
grades according to the company. The 560HD meets the requirements of
newer low-emissions technology which pressurizes the diesel fuel and
raises its temperature. The homopolymer has minimum swelling when
it is immersed in automotive fuels; a good combination of stiffness, tough-
ness, and strength; and low fuel vapor permeation. DuPont introduced
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homopolymer Delrin 460E, 1260E; and Delrin copolymer with lower
volatile organic compounds (VOCs) and odor.
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DuPont Engineering Polymer’s self-lubricating Delrin KM reinforced
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with chopped Kelvin aramid fiber for beverage bottle conveyor belts has
extra high abrasion resistance and durability [11].
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Ticona Celcon (sold in the Americas) and Duracon (sold in Asia)
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and Hostaform (sold in Europe) acetal copolymer resins and compounds
have been introduced for the increasing use of laser-markable, UV, and
conductive products.
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Ticona Hostaform acetal copolymer was overmolded with styrene-
ethylene/butylene-styrene (SEBS) thermoplastic elastomer (TPE), which
had an adhesive strength at the interface between polyacetal and TPE
better than the tear strength of the TPE [10].
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BASF Performance Products’ Ultraform acetal copolymer applica-
tions have been extended to household and kitchenware such as cof-
feemaker housings because of the copolymer’s moldability and resistance
to the acids, essential oils, fats, and more than 700 different aromatic
chemicals to which the copolymer is exposed [9].
New acetal homopolymer and copolymer compounds are supplied by
PennFibre Plastics. Homopolymer compounds are for decorating appli-
cations, painting, and printing on injection-molded products. PennFibre
Plastics, a division of Ensinger, supplies high-temperature extruded,
cast, and pressed semifinished and finished stock shapes, including
engineering thermoplastic sheet, strips, coil, plates, rods, disks, heavy
and thin wall tubes, plain punched parts, rings, washers, bushings,
insulators, standoffs, and custom shapes. Rolls range from 0.025 to
0.625 cm (0.01 to 0.250 in) thick and 125 cm (50 in) wide and strip down
to 0.625 cm for stamping. These include fabric backing for gluing and
laminate finish types. Copolymer glass-fiber-reinforced composites have
been introduced with higher strength-to-weight ratios and a wider
range of mechanical properties. The company’s portfolio of engineering