Professional-grade anodization masking tape with chromic acid resistance, delivering 5x faster masking and up to 60% labor savings compared to liquid alternatives. Purple transparent backing for precision positioning.
3M™ Anodization Masking Tape 8985L is a specialized industrial masking solution engineered specifically for chromic acid (Type I) anodization baths. This premium tape features a tough polyester backing with a non-silicone rubber adhesive formulation, making it resistant to chromic acid exposure while minimizing the risk of silicone contamination that could compromise downstream processes such as bonding or paint adhesion. The transparent purple tape allows for fast and accurate positioning, enabling operators to mask and de-mask components up to 5 times faster than traditional liquid masking methods, with no cure time required.
Designed for superior performance in demanding industrial applications, this tape delivers sharp masking lines while minimizing leakage and the need for part rework. The polyester backing provides excellent durability and chemical resistance, while the rubber adhesive ensures clean, one-piece removal without residue. Users can achieve up to 60% reduction in labor time and associated costs compared to labor-intensive liquid masking processes. The tape comes with a film liner that provides added stability for easy die-cutting and precise application on a variety of aluminum and other metal alloys.
Each case contains 48 rolls of 1-inch wide tape, with 72 yards per roll, providing substantial coverage for large-scale production operations. The maximum operating temperature of 93°C ensures reliability in hot processing environments. This tape is ideal for aerospace components, precision machine components, and welded assemblies where dimensional accuracy and surface quality are critical. For industrial and occupational use only, this product represents a significant productivity improvement over conventional masking methods.
Key Features
- Designed specifically for chromic acid (Type I) anodization baths with superior chemical resistance
- Masks and de-masks up to 5x faster than liquid masking with zero cure time required
- Transparent purple tape for fast, accurate positioning and easy identification
- Non-silicone formulation reduces post-process coating and bonding failures
- Provides sharp masking lines and minimizes leaking to reduce rework requirements
- Polyester backing with rubber adhesive for clean, one-piece removal without residue
- Film liner provides added stability for precise die-cutting applications
- Up to 60% reduction in labor time and associated costs versus traditional liquid masking
- Suitable for use with or without chemical film on aluminum and metal alloys
- Maximum operating temperature of 93°C for hot processing environments
Technical Specifications
| Specification |
Value |
| Product Number | 8985L |
| UPC Code | 00638060403761 |
| 3M ID | 7100207280 |
| Product Type | Masking Tape |
| Product Color | Purple Transparent |
| Backing Material | Polyester |
| Adhesive Type | Rubber (Non-silicone) |
| Overall Width (Imperial) | 1 inch |
| Overall Width (Metric) | 25.4 mm |
| Overall Length (Imperial) | 72 yards |
| Overall Length (Metric) | 65.8 meters |
| Total Tape Thickness without Liner (Imperial) | 3.9 mil |
| Backing Thickness (Imperial) | 3 mil |
| Backing Thickness (Metric) | 0.076 mm |
| Core Size (Imperial) | 3 inches |
| Core Size (Metric) | 7.6 cm |
| Maximum Operating Temperature (Celsius) | 93°C |
| Maximum Operating Temperature (Fahrenheit) | 199°F |
| Number of Adhesive Sides | Single-sided |
| Clean Removal | Yes |
| Units per Case | 48 rolls |
| Smallest Saleable Unit | Roll |
| Brand | 3M™ |
| Product Series | 8985L |
| Application | Chromic acid (Type I) anodization baths |
| Compatible Substrates | Aluminum and other metal alloys |
| Industries | Automotive, General Industrial, MRO, Military & Government, Specialty Vehicles, Transportation |
| Recommended Applications | Aerospace components, Precision machine components, Welded assemblies |
| Liner Type | Film liner for die-cutting stability |
| Cure Time | No cure time required |
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