Professional-grade photo film splicing tape with aggressive rubber adhesive, polyester backing, excellent chemical resistance, and reliable performance from -60°F to 300°F. Perfect for photographic processing, web splicing, and industrial film applications.
3M™ Photo Film Splicing Tape 8421 is a professional-grade splicing tape specifically designed for photographic film and web processing applications. Featuring a creamy white polyester backing with an aggressive rubber adhesive, this tape provides exceptional adhesion to a variety of film types while maintaining excellent chemical and solvent resistance. The tape is engineered to withstand the demanding conditions of photographic developing processes, offering reliable performance in high-temperature and high-stress environments.
The 12-inch wide by 360-yard roll delivers superior bonding strength with an adhesion rating of 50 oz/in (54 N/100mm) and impressive tensile strength of 43 lb/in (754 N/100mm). The tape's polyester backing provides additional abrasion protection and dimensional stability, making it ideal for general wide web splicing, butt splicing, core starting, and defect marking applications. Its 2.5 mil thickness offers the perfect balance between strength and flexibility without excessive bulk.
Operating reliably across an extensive temperature range from -60°F (-50°C) to 300°F (150°C), this industrial-grade tape maintains its flexibility and adhesive properties even in extreme conditions. The distinctive blue color backing enables easy identification of splices in production environments. With an elongation at break of 140%, the tape accommodates film movement and stress without tearing, making it an essential supply for professional photo processing facilities, film manufacturers, and web processing operations.
Key Features
- Aggressive rubber adhesive with high tack for quick grab and excellent adhesion to various films
- Polyester backing provides superior durability, abrasion resistance, and dimensional stability
- Exceptional chemical and solvent resistance ideal for photographic development processes
- Operates reliably across extreme temperature range from -60°F to 300°F with maintained flexibility
- Distinctive blue color backing for easy splice identification in production environments
- 140% elongation at break accommodates film movement without tearing
- High adhesion strength of 50 oz/in and tensile strength of 43 lb/in
- Suitable for splicing, sealing, color-coding, edging, and defect marking applications
Technical Specifications
| Specification |
Value |
| Product Number | 3M™ 8421 |
| Part Number | 8421 |
| UPC Code | 00051115817854 |
| Overall Width (Imperial) | 12 in |
| Overall Width (Metric) | 304.8 mm |
| Overall Length (Imperial) | 360 yd |
| Overall Length (Metric) | 329.184 m |
| Total Tape Thickness (Imperial) | 2.5 mil |
| Total Tape Thickness (Metric) | 0.06 mm |
| Backing Thickness (Imperial) | 1.4 mil |
| Backing Thickness (Metric) | 0.04 mm |
| Adhesive Thickness (Metric) | 0.04 mm |
| Backing Material | Polyester |
| Facestock Material | Polyester |
| Adhesive Type | Rubber |
| Product Color | Blue |
| Product Form | Roll |
| Adhesion Strength (Imperial) | 50 oz/in |
| Adhesion Strength (Metric) | 54 N/100mm |
| Tensile Strength (Imperial) | 43 lb/in |
| Tensile Strength (Metric) | 754 N/100mm |
| Elongation at Break | 140% |
| Minimum Operating Temperature (Fahrenheit) | -60 ℉ |
| Minimum Operating Temperature (Celsius) | -50 ℃ |
| Maximum Operating Temperature (Fahrenheit) | 300 ℉ |
| Maximum Operating Temperature (Celsius) | 149 ℃ |
| Smallest Saleable Unit | 1 Roll per Case |
| Brand | 3M™ |
| Chemical Resistance | Excellent - Solvent and photographic process resistant |
| Use Type | Industrial/Occupational - Not for consumer use |
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