[METRIC]
A-A-52446
March 10, 1994
SUPERSEDING
MIL-S-62502 (AT)
15 December 1987
COMMERCIAL ITEM DESCRIPTION
SHEET MOLDING COMPOUND: LOW SHRINKAGE (METRIC)
The General Services Administration has authorized the use of this commercial item description (CID) as a replacement for MIL-S-62502 (AT) which is canceled.
ABSTRACT
This CID covers requirements for a high strength, low shrinkage, sheet molding compound (SMC) and molded plastic parts made therfrom. The low shrinkage property imparts dimensional stability to the molded parts. Items made from this material are primarily used for nonappearance, high strength body panels that are not painted.
SALIENT CHARACTERISTICS
a. Material. The SMC material covered by this CID shall posses high strength, low shrinkage characteristics and shall be reinforced with 32.5 ± 2.5 percent (%) by weight of glass fiber rovings chopped into lengths not less than 23 millimeters (mm). The SMC material shall be formulated with appropriate types and mounts of additives, such as, calcium carbonate filler, zinc stearate mold release, catalyst, thickener, and pigment, as required to meet the salient characteristics of this CID. The use of this recovered material made in compliance with regulatory requirements is acceptable provided all the requirements of this CID are met (see Note d).
b. Design and construction. Parts molded from this SMC material shall be designed and constructed in accordance with applicable engineering drawing (AED) (see Note b).
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Beneficial comments, recommendation, additions, deletions, clarifications, etc. and any other data which may improve this document should be sent by letter to: U.S. Army-Tank-Automotive Command, ATTN: AMSTA-GDS, Warren, MI 48397-5000. |
DISTRIBUTION STATSMENT A. Approved for public release; distribution is unlimited.
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