Standard

SAE AMS6891A

Published

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Abstract

The intent of this specification is for the procurement of carbon fiber and fiberglass epoxy prepreg products with 350 °F (177 °C) cure for aerospace applications; therefore, no qualification or equivalency threshold values are provided. Users that intend to conduct a new material qualification or equivalency program must refer to the production quality assurance section (4.3) of this base specification, AMS6891. Form This specification and its associated detail specifications establish the requirements for a 350 °F (177 °C) autoclave cure, continuous fiber (“unidirectional tape and fabric prepreg”) impregnated with a modified B-staged epoxy resin. Detail Specification This base specification contains basic fiber reinforced epoxy prepreg material requirements that apply to every product. The detail specifications contain additional or superseding properties and requirements that apply to a specific product. Purpose a. The purpose of this specification is to allow procurement of a defined material corresponding to the statistically derived material properties published in CMH-17 (formerly MIL-HDBK-17). b. The materials qualified to this specification are designed specifically for vacuum-bag autoclave cure (see 4.4.9). c. This specification is developed based on the material properties that are available publicly. The user may specify additional requirements beyond those defined in this specification, especially when the user has generated additional material properties beyond those available publicly or when the application has other requirements. The additional requirements are subject to supplier review and approval. d. The use of this specification does not guarantee material or structural performance. Users should be actively involved in evaluating material performance and quality including, but not limited to, performing regular user quality control tests, performing periodic equivalency/additional testing, participating in material change management activities, conducting statistical process control, and conducting regular supplier audits. e. This material is intended for use in laminate applications with a service temperature up to 250 °F (121 °C). Classification Form Form specifies the basic material form. For example: Form 1: Unidirectional prepreg for hand layup applications Form 2: Unidirectional prepreg tape for automated tape laying equipment Form 3: Unidirectional prepreg tape for automated fiber placement Form 4: Woven fabric prepreg for hand layup applications Form 5: Woven fabric for automated tape laying equipment Type Type specifies the nominal prepreg resin content. For example: Type 35: Nominal resin content 35% by weight Class Class specifies the basic fiber type used in the prepreg. For example: Class 1: Intermediate modulus carbon fiber Class 2: Standard modulus carbon fiber Class 3: S-glass fiber Class 4: E-glass fiber Class 5: High modulus carbon fiber Grade Grade specifies nominal fiber areal weight in grams per square meter (gsm). For example: Grade 190: 190 gsm nominal fiber areal weight Style Style defines the fiber filaments and construction of the fabric prepreg or lists the appropriate industry standard style (not applicable to non-fabric products). For example: Style 6K-PW: 6000 filaments per yarn, plain weave Style 108: Fiberglass fabric as defined in AMS3824, Style 108 with epoxy resin compatible finish Style 7781: Fiberglass fabric as defined in AMS-C-9084, Type VIII B, Class 2 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address all the hazards that may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. Rounding of Values The following applies to all specified limits or requirements in this specification. For purposes of determining conformance with this specification, an observed value or a calculated value must be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of ASTM E29. Conversion of Values Between Inch-Pound and SI Units The following applies to all specified limits or requirements in this specification. For purposes of determining conformance with this specification, an observed value or a calculated value must be directly converted per ASTM SI10 to determine an appropriate equivalent value between inch-pound units and SI units.

Document information

  • Standard from SAE_AC
  • Published:
  • Version: 0
  • Document type: IS