D6412/D6412M Standard Specification for Epoxy (Flexible) Adhesive For Bonding Metallic And Nonmetallic Materials has been reapproved, available as D6412/D6412M-99(2020)

» Código: ASTM D6412 / D6412M - 99(2020)

» Comité: Subcommittee: D14.80

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Abstract

The specification covers a two-part modified epoxy paste adhesive for bonding metallic and nonmetallic materials. The adhesive should be suitable for forming bonds that can withstand environmental exposure to a certain temperature range when exposed to an expected combination of stress, temperature, and relative humidity to be encountered in service. Two types of adhesive shall be classified according to composition. Type I which consists of two-part kits of liquid base and modified amide liquid accelerator. Type I is further subdivided into two grades: Grade 1 with low viscosity and Grade 2 with high viscosity. The other classification is Type II which consists of premixed, frozen, Type I, Grade 1 or Type I, Grade 2. Different tests shall be conducted in order to determine the following mechanical properties of the adhesives: room-temperature shear, high-temperature shear, low-temperature shear, room-temperature Shore D hardness, room-temperature T-peel, and outgassing characteristics such as total mass loss and vacuum condensable material.

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.

1. Scope

1.1 The specification covers a two-part modified epoxy paste adhesive for bonding metallic and nonmetallic materials. The adhesive should be suitable for forming bonds that can withstand environmental exposure to temperatures from –184 to 82 °C [–300 to 180 °F] when exposed to an expected combination of stress, temperature, and relative humidity to be encountered in service.

Note 1: When coordinated through the Department of Defense (DoD) and the National Aeronautics and Space Administration (NASA), this practice will be a direct replacement of MIL-A-82720 (OS), MIS-26872, and MSFC-SPEC-2037.

1.2 The values stated in SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.

1.3 The following precautionary statement pertains to the test method portion only, Section 8, of 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


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

A109/A109M Specification for Steel, Strip, Carbon (0.25 Maximum Percent), Cold-Rolled

A167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

B209 Specification for Aluminum and Aluminum-Alloy Sheet and Plate

D907 Terminology of Adhesives

D1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal)

D1876 Test Method for Peel Resistance of Adhesives (T-Peel Test)

D2240 Test Method for Rubber PropertyDurometer Hardness

D2393 Test Method for Viscosity of Epoxy Resins and Related Components

D2651 Guide for Preparation of Metal Surfaces for Adhesive Bonding

D3951 Practice for Commercial Packaging

D4142 Guide for Testing Epoxy Resins

E595Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment

National Aeronautics and Space Administration (NASA)

GSFC RP 1124 Outgassing Data for Selecting Spacecraft Materials

JSC Sp-R-0022 General Specification, Vacuum Stability Requirement of Polymeric Material for Spacecraft Application

MSFC-HDBK-527/JSC-09604 Material Selection List for Hardware Systems

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