Premium chromic acid anodization masking tape with purple transparent backing, polyester carrier, and non-silicone rubber adhesive. Masks and de-masks 5x faster than liquid masking with sharp lines and minimal leakage.
3M™ Anodization Masking Tape 8985L is a premium industrial masking solution specifically engineered for Type I (chromic acid) anodization applications. This transparent purple tape features a durable polyester backing with a non-silicone rubber adhesive formulation, designed to withstand harsh anodization bath environments while preventing silicone contamination that could compromise downstream bonding and coating processes. The tape delivers superior performance by masking and de-masking up to 5 times faster than traditional liquid masking methods, with no cure time required, resulting in potential labor cost savings of up to 60%.
Engineered for precision and reliability, 3M Anodization Masking Tape 8985L provides sharp masking lines with minimal leakage, significantly reducing the need for part rework and associated costs. The transparent purple color allows for fast, accurate positioning during application, while the printed backing enhances visibility for quality control. The polyester carrier is specifically formulated to resist chromic acid exposure, maintaining tape integrity throughout the anodization process. This tape can be used with or without chemical film on various aluminum and other metal alloys, making it versatile for diverse industrial applications.
The 8985L comes in a convenient roll format with a 3-inch core size, measuring 48 inches in width and 72 yards in length. With a total tape thickness of 3.9 mils and backing thickness of 3 mils, it provides optimal strength and flexibility. The film liner enables easy die-cutting for custom applications, while the single-sided adhesive design ensures clean, one-piece removal. Ideal for aerospace components, precision machine components, and welded assemblies, this tape represents a significant advancement in anodization masking technology.
Key Features
- Designed specifically for Type I chromic acid anodization baths with superior acid resistance
- Masks and de-masks up to 5 times faster than liquid masking with zero cure time
- Transparent purple color enables fast, accurate positioning and easy identification
- Non-silicone rubber adhesive minimizes post-process coating and bonding failures
- Provides sharp masking lines with minimal leakage, reducing part rework requirements
- Polyester backing with film liner for easy die-cutting and custom applications
- Can be used with or without chemical film on aluminum and other metal alloys
- Clean, one-piece removal for improved productivity and labor efficiency
- Potential savings up to 60% in labor time and associated costs
Technical Specifications
| Specification |
Value |
| Product Type | Masking Tape |
| Product Series | 8985L |
| Product Color | Purple Transparent |
| Backing Material | Polyester |
| Adhesive Type | Rubber (Non-Silicone) |
| Overall Width (Imperial) | 48 inches |
| Overall Width (Metric) | 1,219.2 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 | 93°C (199°F) |
| Number of Adhesive Sides | Single-sided |
| Clean Removal | Yes |
| Smallest Saleable Unit | Roll |
| Units per Case | 1 |
| Brand | 3M™ |
| Part Number | 8985L |
| 3M Product Number | 8985L |
| 3M ID | 7100211808 |
| UPC | 00638060403808 |
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