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3M™ Anodization Masking Tape 8985L

3M Product Number 8985L
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  • Designed specifically for masking in chromic acid (Type I) anodization baths
  • Masks and de-masks up to 5x faster* than liquid masking, with no cure time
  • Transparent purple tape for fast, accurate positioning and easy identification
  • Provides sharp masking lines and minimizes leaking to reduce the need for part rework
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  • Designed specifically for masking in chromic acid (Type I) anodization baths
  • Masks and de-masks up to 5x faster* than liquid masking, with no cure time
  • Transparent purple tape for fast, accurate positioning and easy identification
  • Provides sharp masking lines and minimizes leaking to reduce the need for part rework
  • Non-silicone formulation helps reduce post-process coating and bonding failures
  • Polyester backing with rubber adhesive and film liner
  • Liner provides added stability for easy die-cutting

3M™ Anodization Masking Tape 8985L is a reliable non-silicone solution for Type I (chromic acid) anodization. Designed for performance, it is specifically resistant to chromic acid and provides sharp lines with a rubber adhesive for easy removal. This tape can mask and de-mask up to 5x faster* than labor-intensive liquid masking for improved productivity.

Engineered Specifically for Resistance to Chromic Acid
3M™ Anodization Masking Tape 8985L has a tough polyester carrier to stand up to chromic acid anodization baths (Type I anodization). It also features a non-silicone rubber adhesive to minimize the risk of silicone contamination that could impact downstream processes such as bonding or paint adhesion. This tape provides sharp masking edges, minimizing leakage and the need for rework, and can be used with or without chemical film on a variety of aluminum and other metal alloys.

3M™ Anodization Masking Tape 8985L can replace complex, messy liquid masking and the unpleasant odors involved. The transparent tape is easy to position and can be applied in fewer steps; it also eliminates the cure time of a liquid so that overall masking and de-masking can be accomplished up to five times faster*. Ease of application and clean, one-piece removal mean users could save up to 60%* on labor time and associated costs. This tape is transparent purple with a printed backing for visibility and has a liner for easy die-cutting.

*Up to 5x faster and up to 60% reduction in labor time both based on 3M internal data.

Recommended Applications

  • Aerospace components
  • Precision machine components
  • Welded assemblies

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.

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If you are considering a purchase of this or other 3M Industrial Adhesives and Tape products, our team is ready to help by providing additional information and options. Our technical expertise, customer support, and global capabilities put us in a unique position to address your biggest challenges, and we'll do our best to prove that we should be your supplier of choice.


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