3 Surface Conditioning Products Technical Service Bulletin 3M SR Radial Bristle Disc ™ 3M Abrasive Systems © 2001 3M Center, Building 223-6N-01 St.
Product: 3M™ SR Radial Bristle Discs, 2" and 3" diameter, are plastic particle filled bristle products. The SR Radial Bristle Disc has a curved radial design for greater conformability. Applications: 3M SR Radial Bristle Discs are designed to remove thin layers (1/16” or less) of sealants and soft cross-linked adhesives with minimal or no damage to underlying coatings and surfaces, especially in aerospace applications. Examples of sealants are polysulfide, polythioether, polyurethane, silicones, and RTV’s.
Mounting Procedure: Brush Assembly Detail: A 990 Mandrel with four 3M SR radial bristle discs. • Note directional arrows are molded into product. Mandrels for the 2" and 3" SR Radial Bristle Discs: UPC# 048011-14915-8 1 Roloc + Holder 1 (2 to 4 discs*) 1 Roloc + Button 7 UPC# 048011-15012-3 3M™ Mandrel No. 990 (2 to 3 discs*, silver button) (4 to 6 discs*, black button) UPC# 048011-16847-0 3M™ Mandrel No.
Tools: Straight shaft or right angle pneumatic grinders such as, but not limited to, the following: Make and Model ARO 7871-F ARO 8479-1 Dynabrade 52666 Dynabrade 50000 Ingersoll-Rand TD120RG4 Ingersoll-Rand CA120RG4 Dotco 12L2562-01 Dotco 12L1200-36 M.O.S.
General • Removal of gasket adhesive from painted door enclosures 1 Removal of sealant @ 12,000 RPM Test Results Peel Tests A test protocol similar to the peel tests in MIL-PRF-81733D was used to investigate possible adverse effects of SR Radial Bristle Discs on sealant adhesion after disc use. Samples were coated with sealant, which was then removed with SR Radial Bristle Discs, followed by isopropyl alcohol wipe. Sealant was then reapplied to the surfaces and peel tests conducted.
Substrate/Coating Abrasion Tests Various sealants were applied and cured to a number of coatings and substrates. The sealants were then removed with the SR Radial Bristle Discs and the coatings and substrates inspected for damage. Results are as follows: Coating/Substrate Cladding on 0.
