3M™ Polyester Tape 8991 is a blue polyester tape with a silicone adhesive. It can be used in a large variety of high temperature applications including powdercoat masking, flashbreaker, and bag sealing applications. Additional applications include, splicing, tabbing, or roll closing silicone treated liners or materials.
FEATURES
- Polyester films offer excellent thermal, abrasion, and chemical resistance while maintaining their exibility.
- Blue color makes tape placement obvious for both application and removal.
- Thin backing leaves a sharp paint line and some conformability.
- Silicone adhesives offer high heat resistance compared to many rubber and acrylic adhesives, reducing failure due to softening, oozing, and adhesive transfer.
- Silicone adhesives adhere well to tough-to-stick-to surfaces like silicone liners and fixtures coated with mold release.
- Silicone adhesive removes cleanly from many surfaces.
- Linered version available for die-cuts.
APPLICATIONS
- Masking for powdercoat painting.
- Flashbreaker tape when pulling through cured coating such as epoxies.
- Holding and splicing dicult to stick to surfaces such as silicone liner.
- Holding parts or sealing vacuum bags during processing.
| Property | Values | Unit | Test Method |
| Color | Blue | – | Visual |
| Total Tape Thickness | 0.061 | mm | ASTM D3652 |
| Backing Thickness | 0.025 | mm | ASTM D3652 |
| Liner Thickness | 0.075 | mm | ASTM D3652 |
| Peel Adhesion | 3.4 | N/cm | ASTM D3330 |
| Tensile Strength | 50.8 | N/cm | ASTM D3759 |
| Elongation at Break | 100 | % | ASTM D3759 |
| Temperature Use Range | Up to 204 | °C | – |
| Up to 400 | °F | – | |
| Shelf Life | 2 | years | – |
