HLD T870 Thick Mastic Pipeline Filler Tape is a synthetic fiber fabric impregnated and coated with polymer modified bitumen adhesive. The outer surface of the tape is protected by a high density polyethylene backing.
HLD T870 Thick Mastic Pipeline Filler Tape designed for application to longitudinal, spiral or circumferential weld beads on pipelines. Also, can be used as a step down tape for steel sleeves. The thick mastic coating conforms to the weld profile and prevents tenting.
HLD T870 Thick Mastic Pipeline Filler Tape
|Thickness (ASTM D1000)|
|Breaking Strength(ASTM D1000)||20Mpa/30N/cm|
|Elongation @ Break||600%|
|Adhesion Peel Strength (ASTM D1000)|
To primered steel
|Impact Strength(ASTM G-14)||5.9 ft lb|
|Resistance to Cathodic Disbondment||500mm2|
|Maximum Service Temperature||80°C|
|Recommended Holiday Test Voltage||20Kv|
• Excellent adhesion
• Provides extra protection at vulnerable areas
• Conforms to weld bead profile
• Consistent uniform thickness
• Easily applied with no special equipment
• Compatible with common pipe coatings
• Excellent resistance to cathodic disbonding
Prepare surfaces by removing all loose scale, rust or other foreign matter by grit blasting or power wire brush. Apply a thin uniform coat of HLD P19 Primer to all surfaces to be wrapped and allow to tack dry. Apply HLD T870 Thick Mastic Pipeline Filler Tape longitudinally, spriral circumferential around weld beads.
For step down of sleeve application: The thickness of a steel sleeve to pipe can be
approximately 3/4"- 1" (18.75 - 25 mm) therefore HLD T870 Thick Mastic Pipeline Filler Tape can be used to provide a gradual contour from sleeve to pipe. Apply HLD T870 Thick Mastic Pipeline Filler Tape circumferentially with a 50% overlap starting at the end of the sleeve and proceeding minimally 12" (300 mm) past each side of the sleeve onto the pipe. Apply as many layers circumferentially as needed to create a gradual step down effect from each side of the sleeve. Press down and mold the adhesive into the annular space around the end of the sleeve making sure the tape is in contact with the sleeve. In colder weather, a light heating of the adhesive with a propane torch of the HLD T870 Thick Mastic Pipeline Filler Tape will be required to achieve more conformability and tackiness. In warmer weather, no heating of the bitumen adhesive is required. After a gradual step down is achieved apply a HLD T200 Pipe Wrapping Tape Outer or HLD T500 Pipe Wrapping Tape PP to the entire area including the steel sleeve and on top of the HLD T870 Thick Mastic Pipeline Filler Tape.