Overview
The Grainger 21TF50 is a 3/4″ wide, 15-foot length expanded PTFE joint sealant tape engineered for critical sealing applications across industrial and commercial equipment. This form-in-place gasket material uses 100% pure PTFE construction with adhesive backing, eliminating the need for custom-cut gaskets and allowing installation on flanges of any size. The sealant conforms to irregular flange surfaces, creating a tight, leak-resistant seal in accessible bolted joints.
Key Features
- Expanded PTFE construction resists chemical attack, creep relaxation, and temperature extremes
- Adhesive-backed design for secure positioning and ease of installation
- Soft, compressible material that conforms to worn or irregular flange surfaces
- Scissors-cuttable; no special tools or custom gasket ordering required
- Unlimited shelf life with no age deterioration
Technical Specifications
The 21TF50 meets industry standards for expanded PTFE joint sealants:
- Temperature Range: −450°F to 600°F (continuous use up to 500°F recommended)
- Maximum Pressure Rating: 3,000 psi
- Composition: 100% pure expanded PTFE
- Creep Relaxation: ≤0.05 cc/min (ASTM 2378 nitrogen test)
- Chemical Resistance: Inert to most industrial fluids and gases
Typical Applications
- Pump housings, compressors, and heat exchangers
- Flange sealing in oil, gas, chemical, and water treatment plants
- Worn flanges requiring remedial gasket replacement
- Access plates, ducts, compensators, and hand/man holes
- OEM equipment requiring long-term, leak-tight performance
Compatibility & Replacements
Compatible With
- All flat and serrated flange surfaces
- Bolted joint applications in industrial equipment
- Systems operating at temperatures between −450°F and 600°F
- Standard bolted flange assemblies up to 3,000 psi operating pressure
Replaces / Drop-In Replacement For
The 21TF50 functions as a universal replacement for custom-cut gaskets and proprietary sealant tape in 3/4″ width applications. Verify specific equipment compatibility with your system integrator before ordering.
Works With
- Flange bolt patterns of any size (form-in-place application)
- Standard wrench and hand-tool installation
- Industrial equipment maintenance and repair workflows
- Compatible with petroleum, water, steam, and chemical service fluids
