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LLFA® Smooth

LLFA® Smooth is a fast-acting insulating putty that stays flexible and works well in conjunction with LLFA® Tape. It is an ideal solution for filling rough and/or uneven surface before using LLFA® Tape to seal the leak.

Some of LLFA® Smooth’s notable features are:

  • It is soft enough to mold into any cavity or change in diameter, yet consistent enough to hold its shape once applied.
  • It saves time as LLFA® Smooth molds quickly and easily, without the use of gloves or chemicals.
  • It saves money by reducing application time. Also, by not having to make additional layers to fill in gap, less LLFA® tape is needed to create the seal.

LLFA® Smooth has the same insulation and temperature stability rating as LLFA® Tape. Once applied, the LLFA® Tape and LLFA® Smooth will amalgamate over time to form a homogenous mass.

Properties of LLFA® Smooth:

  • Electrical Splice Insulating Putty.
  • Smooth  =  >113g / ¼lb pack.
  • Smooth Brick = 100mm x 150mm / 4” x 6”.
  • Smooth Thin = >100g 2mm x 25mm (.08”x1”).



Seals live leaks up to 150PSI, on water, Air, and Steam.


Used by leading natural gas companies both locally and internationally.


Outstanding performance for high or low voltage insulation.


Provides an enduring seal under extreme environmental conditions.

Technical Specs

Temperature Range 90'C through to 260'C
Dielectric Strength 400VPM* LIFA 40**,600VPM* LIFA 20,800VPM* LIFA 12
Tear Resistance >130 PSI
Water Absorption << 0.5%
Elongation >325%
Track Resistance Will prevent electrical conduction along its surface.
UV Resistance Highly UV resistant.
Adhesion (Fusion) Standard requirement:"Tape shall not unwind more than 1.0 inch after 3 minutes with an attached load of 600g." Tape shall not unwind more than 1.0 inch after 3 minutes with an attached load of 600g.
Thermal Stability -90'C to 260'C continuous
Tensile Strength > 1200 PSI throughout temperature range.
Breaking Strength > 15 lbs.
Durometer Hardness 15 lbs
Acids and Alkaline No negative effect from brief exposure to acids and alkaline and can withstand submersion up to 3 days.
Corona Resistance Corona resistant; wrapping tension minimises voids in which corona exists.
Ozone Resistance Highly ozone resistant.
Self Extinguishing UL standard 94 rating V-0. Tested to IEEE383 and IEEE1212 for flammability - self extinguishes and will not propagate a flame.
Standard Compliance ASTM D2240, A-A-59163, ASTM D-149, ASTM D-412, MIL-I-46852, ASTM D2148, ASTM D3767 (LLFA specifications meet other international standards not included in this list.)
*VPM = Volts Per Mil (1 Mil = 0.0254 mm)
** LLFA 40 is a 40 Mil thick tape (40 Mil = 1.016 mm)


For more information of how LLFA®  can provide Solutions for you.