ASTM E1556 - 12

    Standard Specification for Epoxy Resin System for Composite Skin, Honeycomb Sandwich Panel Repair

    Active Standard ASTM E1556 | Developed by Subcommittee: E06.53

    Book of Standards Volume: 04.11


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    Abstract

    This specification covers the requirements for an epoxy resin system intended for the repair of sandwich panels for durable, rigidwall, relocatable structures. It must be usable in a field environment and shall not require the use of special equipment such as autoclaves or presses. The epoxy system covered by this specification shall be usable for simultaneous impregnation of a wet-layup composite skin and bonding of that skin to a substrate honeycomb core. The inspection and testing of the epoxy system shall be classified as qualification tests and quality conformance tests. The following test methods shall be performed to conform to the requirements specified: tensile lap shear strength; apparent horizontal shear strength; and flatwise tensile strength.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    5.1 Epoxy resin systems used in the repair of composite skin sandwich panels for durable, rigidwall, relocatable shelters must have a combination of mechanical property levels and environmental resistance that will assure long-term durability of the skins and the skin-to-core adhesive bonds when exposed to severe climatic exposures. In addition, these epoxy materials must have processability characteristics that permit their use in a variety of repair scenarios and environments.

    5.2 Intended Use—Epoxy systems conforming to this specification are intended for use in the repair of honeycomb panels at the maintenance field level. The material is intended for use with SAE-AMS-C-9084 glass cloth.

    5.2.1 This is a procurement control document for the procurement of the epoxy system and designers shall be aware that the test values specified herein are based upon tests performed with specific glass-resin composite adherends and shall not be used for design data.

    5.2.2 Epoxy systems covered by this specification are not intended for use in production bonding of sandwich construction.

    1. Scope

    1.1 This specification covers the requirements for an epoxy resin system intended for the repair of sandwich panels for durable, rigidwall, relocatable structures. It must be usable in a field environment and shall not require the use of special equipment such as autoclaves or presses. The epoxy system covered by this specification shall be usable for simultaneous impregnation of a wet-layup composite skin and bonding of that skin to a substrate honeycomb core. The material shall withstand exposure to temperatures from −54 to 93°C (−65 to 199°F) and high relative humidity, and also the combination of stress, temperature, and relative humidity that are expected to be encountered in service.

    1.2 The values stated in SI units are to be regarded as standard where only SI units are given or where SI units are given first followed by inch-pound units; where inch-pound units are given first followed by SI units, the inch-pound units are to be regarded as the standard.

    1.3 The following safety hazards caveat refers only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C297/C297M Test Method for Flatwise Tensile Strength of Sandwich Constructions

    D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement

    D2344/D2344M Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates

    D2584 Test Method for Ignition Loss of Cured Reinforced Resins

    D2734 Test Methods for Void Content of Reinforced Plastics

    D3165 Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies

    E631 Terminology of Building Constructions

    E1091 Specification for Nonmetallic Honeycomb Core for Use in Shelter Panels

    E1749 Terminology Relating to Rigid Wall Relocatable Shelters

    Military Specifications

    MIL-I-24768 Insulation, Plastic, Laminated, Thermosetting, Glass-Cloth, Epoxy-Resin

    Military Standards

    MIL-STD-1916 DOD Preferred Methods for Acceptance of Product

    Commercial Standards

    SAE-AMS-C-9084 Cloth, Glass, Finished for Epoxy Resin Laminates


    ICS Code

    ICS Number Code 83.140.20 (Laminated sheets)

    UNSPSC Code

    UNSPSC Code 30162400(Partition walls); 31133708(Epoxy conformal coating)


    DOI: 10.1520/E1556-12

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