Appliance Design - October 2008 - (Page 16)

PROTOTYPING variety of medical applications. Huntsman Advanced Materials, of The Woodlands, Texas, has also released a new, more durable stereolithography material. The ABS-type material, RenShape UltraClear SL7870, is a transparent material that includes heat deflection temperatures of up to 85 DegC, elongations at break as high as 30 percent, flexural strengths from 7,000 to 15,000 psi, and good humidity resistance (40 DegC and 90 percent R/H), says Harald Wiedemann, who heads strategic marketing for Huntsman. The material yields parts that are clear without blue or green tints. It is an antimony-free, lowviscosity, stable liquid that produces models and prototypes that are “as clear as glass” according to the CIELAB color scale system, he says. It is formulated to conform to FDA USP 23 Class VI standards for use in medical modeling and prototyping. At 3D Systems, Rock Hill, S.C., several new SL materials have been developed that are meant to offer greater durability, says Steve Hanna, stereolithography materials manager. These new products include the DuraForm XR3000, a translucent, white-in-color, material that has good chemical resistance and elevated impact strength. The company also introduced three new products in its Accura product line including the Accura 48HTR, the Accura Extreme, and the Accura Bluestone. The Accura 48HTR is a ceramic composite material that is meant for high temperature applications of up to 130 DegC. The Accura Extreme features the aesthetics and properties of a grey-molded ABS or polypropylene production part. It has impact strength of 35 to 52 J/m, elongation at break of 14 to 22 percent, flexural strength of 52 MPa to 71 MPa, and flexural modulus of 1,520 MPa to 2,070 MPa. The Bluestone is a nanocomposite material that has a flexural strength of 124 MPa to 154 MPa, flexural modulus of 8,300 MPa to 9,800 MPa, and impact strength (Notched Izod) of 14 to 17 J/m. Selective Laser Sintering Selective laser sintering builds parts using powdered metal or plastic materials. A computer-guided laser is used to sinter or bond the powdered material together. The laser scans cross sections generated from a 3D digital file. As the laser moves, it fuses small particles of polymers and metals into a working prototype. The laser scans cross sections generated from a 3D digital file. After a cross section of the part is sintered, the powder bed is lowered and a new layer of material is deposited and sintered on top. It can make very complex geometries directly from digital CAD data. Sintered parts can be porous and have a rougher surface finish compared to other prototyping parts, but can be modified to improve strength and surface finish. Laser sintering allows designers to craft parts with varying wall thicknesses and allows the build of hollow structures with internal components, says Florian Pfefferkorn, a plastics product manager with EOS of Germany, a manufacturer of prototyping machines and materials. EOS now offers a new plastic and a new metal material for SLS. The plastic is PrimePart DC, which is an impact-resistant polyamide with a tensile strength of 48 MPa. It has an elongation break at 50 percent, which Pfefferkorn says is about 50 percent greater 16 applianceDESIGN AD01084AmerN.indd 1 October 2008 12/10/07 11:26:17 AM www.applianceDESIGN.com http://www.americannickeloid.com http://www.americannickeloid.com http://www.applianceDESIGN.com

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Appliance Design - October 2008 Contents Editorial Shipments/Forecasts News Watch Prototyping - Materials Play the Part Prototyping - Mix & Match Motors Electronics Coatings Design Marts Association Report: AHRI Advertiser's Index

Appliance Design - October 2008

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