3M 851
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- 4.0 Mil Tape Construction
- Low-Stretch Polyester Backing
- Undercut-Reducing Adhesive Coating
Product Description
3M Greenback Printed Circuit Board Tape 851 is a green polyester-film tape with a blended silicone-and-rubber adhesive for printed circuit board plating and high-temperature masking. The 4.0 mil total construction combines a low-stretch backing with a thick adhesive coating. Reduced backing stretch and recovery help form even stop-off lines, while the coating blocks plating solution between circuit fingers to reduce undercutting. For circuit-board processing, the adhesive generally performs better when the tape and boards are not heated in an oven. The tape masks circuit-board contact areas during electroplating and is removed after the masking operation.
Key features
- 4.0 mil total construction: The green polyester backing carries a blended silicone-and-rubber adhesive coating.
- Low-stretch stop-off masking: Limited backing stretch and recovery help keep the masked plating boundary even.
- Plating-solution barrier: The thick adhesive coating blocks solution between circuit fingers to reduce undercutting.
Applications
Printed circuit board masking; circuit plating; other high-temperature masking applications.
