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SAE AMS3726 Revision E, August 1, 2011
Shims, Filled Resin Compound
Description / Abstract:
Form
This specification covers filled, thermosetting resin compounds capable of being applied and cured in place between the surfaces of mechanically fastened (joined) structures.
Application
These products have been typically used as molded shims during assembly of aircraft components and parts requiring good flatwise compression properties and adhesion to metallic or nonmetallic materials, but usage is not limited to such applications. In most applications, the compound will be required to adhere to only one of the mating surfaces; i.e., the compound is not intended to be an adhesive. Each application should be considered individually.
Classification
Resin compounds covered by this specification are classified as follows:
Class 1: Two part epoxy or modified epoxy base with separate harder or curing agent.
Type 1: Two part epoxy or modified epoxy, normal Cure cycle material: 5 hours after mixing at 75 °F ± 5 to reach Shore D Durometer Hardness of 55, determined in accordance with ASTM D 2240. At Shore D Durometer hardness of 55, fastener holes may be drilled and assemblies containing AMS3726D Class 1 Type 1 material may be disassembled without damage to the material.
Type 2: Two part epoxy or modified epoxy rapid cure cycle material: 2 hours after mixing at 75 °F ± 5 to reach Shore D Durometer hardness of 55, determined in accordance with ASTM D 2240. At Shore D Durometer hardness of 55, fastener holes may be drilled and assemblies containing AMS3726D Class 1 Type 2 material may be disassembled without damage to the material.
Class 2: Precatalyzed epoxy or modified epoxy base polymer supplied in sheet form.
Class 3: Precatalyzed epoxy or modified epoxy base polymer supplied as a liquid in a tube or other suitable container.
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 the hazards which 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.
This specification covers filled, thermosetting resin compounds capable of being applied and cured in place between the surfaces of mechanically fastened (joined) structures.
Application
These products have been typically used as molded shims during assembly of aircraft components and parts requiring good flatwise compression properties and adhesion to metallic or nonmetallic materials, but usage is not limited to such applications. In most applications, the compound will be required to adhere to only one of the mating surfaces; i.e., the compound is not intended to be an adhesive. Each application should be considered individually.
Classification
Resin compounds covered by this specification are classified as follows:
Class 1: Two part epoxy or modified epoxy base with separate harder or curing agent.
Type 1: Two part epoxy or modified epoxy, normal Cure cycle material: 5 hours after mixing at 75 °F ± 5 to reach Shore D Durometer Hardness of 55, determined in accordance with ASTM D 2240. At Shore D Durometer hardness of 55, fastener holes may be drilled and assemblies containing AMS3726D Class 1 Type 1 material may be disassembled without damage to the material.
Type 2: Two part epoxy or modified epoxy rapid cure cycle material: 2 hours after mixing at 75 °F ± 5 to reach Shore D Durometer hardness of 55, determined in accordance with ASTM D 2240. At Shore D Durometer hardness of 55, fastener holes may be drilled and assemblies containing AMS3726D Class 1 Type 2 material may be disassembled without damage to the material.
Class 2: Precatalyzed epoxy or modified epoxy base polymer supplied in sheet form.
Class 3: Precatalyzed epoxy or modified epoxy base polymer supplied as a liquid in a tube or other suitable container.
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 the hazards which 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.
SAE AMS3726 Revision E, August 1, 2011
Shims, Filled Resin Compound