3M™ Polyester Tapes 8421 and 8422 are for the photographic industry for splicing most film for processing through the developing chemicals. Frequently used in chemical baths at 150°F (66°C). Excellent solvent and chemical resistance, especially those found in photographic processes. Aggressive rubber adhesive grabs quickly and adheres well to a variety of films. Hot caustics will weaken backing after prolonged immersion. 3M tape 8421 white backing is used to easily identify splices.
Applications: Pre-splicing of most photographic film for processing (thorough testing and evaluation is suggested due to varying processing baths); General wide web splicing, including butt splicing and core starting; Sealing, color-coding, protecting and edging where a higher tack rubber adhesive is needed; Defect marking
Filename | Action |
3m-8421-8422-data-sheet.pdf | [ Download File ] |
Tech Specs | |
Backing | Polyester |
Adhesive Type | Rubber |
Total Thickness | 2.4 mils |
Adhesion to Steel | 42 oz./in. width (46 N/100 mm) |
Tensile Strength | 38 lbs./in. width (665 N/100 mm) |
Elongation at Break | 125% |
Operating Temperature | -60F (-50C) to 300°F (149°C) |
Colors | Creamy white |