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4th Edition, August 2017

Complete Document

Sealer - Anaerobic Gasket

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Active, Most Current

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Product Details:

  • Revision: 4th Edition, August 2017
  • Published Date: August 2017
  • Status: Active, Most Current
  • Document Language: English
  • Published By: General Motors Company (GMNA)
  • Page Count: 6
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

Material Description. A red anaerobic polyacrylate resin base gel-like compound that solidifies by polymerization when confined between two surfaces in the absence of air or by exposure to high temperatures. When cured, the compound becomes a tough plastic material capable of providing a gasket or flange seal for oil and other automotive powertrain fluids.

Symbols. Not applicable.

Applicability. The material shall be capable of sealing gaps up to 0.25 mm between two metal surfaces and withstanding pressure of 35 MPa upon full cure. Cam or bearing cap to block. Excessive amounts of oil and dirt must be removed from the sealing surfaces for maximum results.

Temperature Use Range. It is best suited for application where temperatures range from -54 °C to 150 °C. Low temperature performance is based on maintaining 50% or more of the original minimum static shear strength after 2 h exposure (measure in 30 s or less). The low temperature test is not required for this standard. The upper temperature limit is based on Table three (3) aging requirements.

Remarks. The words must, shall or will as used in this document mean a mandatory requirement.

Application of the product outside its use category (gasketing) as defined by GMW16800, is strictly prohibited.

Preferential bonding to one surface (adhesive failure) can be an indicator of surface contamination or inactivity if the metal is different.

This gasket anaerobic has air mixed in it and is designed for manual or semi-automatic dispense applications (not fully automated).

Test Result Perspective. Steel forms are used to establish and compare gap limit, cure speed and strength between retaining compounds. Test this product on end use surfaces as the metal reactivity (1.4.6) and production surface cleanliness affecting cure speed and strength to gap may be different from the values in this specification.

Container Size. No anaerobic container is more than 1 L because pressure on the product in the container can cause curing. Do not transfer anaerobic into an unauthorized or contaminated container.

Reactive Surfaces. Anaerobics bond with active metal ions and cure in the absence of air. The following are very reactive; brass, copper, manganese, followed by active; aluminum, bronze, iron, nickel and steel. Inactive metals are annodized aluminum, cadmium, chrome finishes, Inconel, magnesium, plated parts, galvanized steel, stainless steel, titanium and zinc. Small percentages of copper or other active metals are added to inactive compositions to promote anaerobic curing. Borate and nitrate cleaning residues will retard bonding and cure.