From - DaTong Tech

3M Tape : 

3M 851 - 3M Greenback Printed Circuit Board Tape

Green, 4.0 mil (0.10 mm) polyester film tape with silicone/rubber adhesive blend. A polyester film tape with a unique conformable adhesive for printed circuit board masking during electroplating.

3M 853 - 3M Polyester Film Tape

Transparent, 2.2 mil (0.06 mm) polyester film tape with acrylic adhesive. Solvent resistant adhesive.

851ST,made in China;

853Y,made in China;