Standard

SAE AMS1389

Published

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Abstract

Form This specification covers polythioether rubber fuel resistant sealing compounds, supplied as a two-component system, which cure rapidly when exposed to a cure on demand (CoD) light source used to initiate a reaction that generates crosslinking of sealant polymers. Type 2 compounds also cure at ambient conditions, without light exposure. Application This product is intended for use on aircraft integral fuel tanks and fuselage for repair of fillet and fastener seals as well as initial sealing of fasteners and sealing of seams and joints (non-faying surfaces), for service from -80 to +320 °F (-62 to +160 °C), with short-term exposures (approximately 6 cumulative hours) up to 360 °F (182 °C), but usage is not limited to such applications. This product is not recommended for use on aircraft windshields or canopies, or other applications where crazing or degradation of plastic components may occur. Sealing compound must be applied at temperatures above 50 °F (10 °C) but will cure at temperatures as low as 20 °F (-7 °C) when exposed to a light source in accordance with manufacturer instructions. Sealing compound applied to exterior surfaces shall be overcoated with applicable coatings. Notice This material is mixing ratio sensitive. The light source required for cure on demand shall be within the range of visible through UV-A (780 to 315 nm) and use shall be in accordance with manufacturer instructions (4.5.4.5). Ambient light sources must be taken into consideration during application processes as they may decrease worklife and affect sealing compound cure. All sealing compounds covered by this specification require an adhesion promoter as recommended by the manufacturer for proper adhesion. Classification All sealing compounds covered by this specification are classified as follows: Type 1 – Two-part, cures only when activated by exposure to a designated light source. Type 2 – Two-part, cures when activated by exposure to a designated light source or after a designated time without exposure to light (hereafter also referred to as ambient cure). Grades The material shall be supplied in the following Grades: Grade 1 – Cured specific gravity from 1.21 to 1.50 Max Grade 2 – Cured specific gravity of 1.20 Max Classes Class B – Suitable for application by extrusion gun or spatula. B-CoD Cures only by exposure to light source (Type 1 material) B-2 Cures by exposure to light source or by chemical reaction with no light source required (Type 2 material) B-8 Cures by exposure to light source or by chemical reaction with no light source required (Type 2 material) Class R – Suitable for robotic applications. R-CoD Cures only by exposure to light source (Type 1 material) Safety - Hazardous Materials Shall be in accordance with AS5502 (1.1).

Document information

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