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3M™ Photo Film Splicing Tape 8421 White, 1 in x 72 yd 2.5 mil, 36 per case Bulk

3M ID  70009272017    UPC#  00021200057502    3M Product Number  8421     
3M™ Photo Film Splicing Tape 8421 is used to pre-splice photographic film for processing. The creamy white tape features a heavy polyester backing, an aggressive, versatile rubber adhesive that is both solvent and chemical resistant.
  • Aggressive rubber adhesive grabs quickly and adheres well to irregular surfaces
  • Excellent solvent and chemical resistance, especially those found in photographic processes
  • Used for pre-splicing of most photographic film for processing
  • Remains flexible at -60ºF (-50ºC) and is dimensionally stable up to 300ºF (150ºC)
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Rubber Adhesive Offers High Tack with Excellent Chemical Resistance
The strong yet thin backing of 3M™ Photo Film Splicing Tape 8421 is ideal for splicing most film for processing through the developing chemicals. In addition, the stiff polyester provides additional abrasion protection and makes it less likely to curl or fold over on itself. The rubber adhesive sticks well to irregular surfaces, offers excellent chemical and solvent resistance and features high shear strength. The tape remains flexible at -60ºF (-50ºC) and is dimensionally stable up to 300ºF (150ºC).

Recommended 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, labeling, protecting and edging where a higher tack rubber adhesive is desirable

Bringing Better Ideas to the Surface through Science and Innovation
In our 3M Industrial Adhesives and Tapes Division, we apply the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, our technologies help customers like you deliver competitive products to the market faster and more efficiently.


 Adhesion Strength‎‎ 50 oz/in
 Adhesion Strength (metric)‎‎ 54 N/100mm
 Adhesive Type‎‎ Rubber
 Applications‎‎ Butt Splicing and Core Starting
 Backing Material‎‎ Polyester
 Backing Thickness‎‎ 1.4 mil
 Backing Thickness (metric)‎‎ 0.04 mm
 Brand‎‎ 3M
 Color‎‎ White
 Consumer Label‎‎ No
 Elongation‎‎ 140 Percent
 Facestock‎‎ Polyester
 Industries‎‎ General Industrial,‎ Print
 Length‎‎ 72 Linear Yard
 Length (Metric)‎‎ 65.83 m
 Maximum Operating Temperature (Celsius)‎‎ 149 Degree Celsius
 Maximum Operating Temperature (Fahrenheit)‎‎ 300 Degree Fahrenheit
 Minimum Operating Temperature (Fahrenheit)‎‎ -60 Degree Fahrenheit
 Product Form‎‎ Roll
 Shelf Life in Months (from date of manufacture)‎‎ 18
 Tape Thickness‎‎ 2.5 Milli-inch (mil)
 Tensile Strength‎‎ 43 lb/in
 Tensile Strength (metric)‎‎ 754 N/100mm
 Width‎‎ 1 Inch
 Width (Metric)‎‎ 25.4 mm