Hot Applied Traffic Loop Sealant

General Information

Description: Dura-Fill LS is a specialty grade, premium quality joint sealing compound. It is designed for use in direct fire kettles with heat controls for both oil and sealant. It can also be used in bottom fired kettles providing that it is equipped with a mechanical agitator system. Dura-Fill LS is relatively hard and has a high softening point, which makes it well suited for sealing traffic loop detector cuts.

Recommended Uses: Dura-Fill LS is recommended for sealing traffic loop detector cuts in portland cement and asphaltic pavements. It is designed to be a thin free flowing sealant at liquid temperatures for easy application in loop detector cuts. Once cooled, Dura-Fill LS forms a stiff but flexible seal.

Cut Preparation: Proper surface preparation facilitates adhesion and consequently the maximum service life of the sealant. In order for proper adhesion to occur, the cut must be free of moisture, dust, loose aggregate and other contaminates. The substrate and air temperatures must be 40°F or above. Sawing, rout-ing and/or sandblasting are the preferred methods of preparation. Use oil-free compressed air and heat to clean and dry the cut immediately prior to sealing. Cuts should be sized so that the maximum extension and compression do not exceed 50% of the width. Best results are obtained when the cuts are opened at least ½ inch wide.

Melting and Application: Dura-Fill LS may be melted in direct fired or oil jacketed kettles. Carefully insert small quantities of Dura-Fill and the plastic bag into the melting equipment while the agitator is turned off. Load material slowly to avoid splash back. After the initial load has reached the recommended pouring temperature, fresh material may be added to the melter as sealant is used. Melt only the material that will be used during that day. Purge material remaining in the melting kettle lines at the end of each sealing operation. The material may be safely reheated as required and can be applied using a pressure fed wand system or a pour pot.

Note: The temperature of the heat transfer oil should not exceed 525°F. Do not heat Dura-Fill above the maximum heating temperature and do not maintain it at that temperature for prolonged periods of time. This could cause the material to gel in the equipment or fail in the joints. A significant viscosity increase accompanied by stringiness signals the approach of gelation. If this occurs, immediately remove the material from the melter and dispose of it.

For further details read and follow the Dura-Fill SDS, Installation Instructions for Direct Fired Dura-Fill Products and P&T Products’ Warranty. 

Product Specification Table

when tested in accordance with ASTM D 5329, 36, modified 3111 & 4402
Maximum Safe Heating Temperature400º F Max.
Application Temperature370º-390º F
Heating Time12 Hours Max.
Penetration77º F35 dmm Max.
Resiliency77º F25% Min.
Flow140º F0 mm Max.
Softening Point200º F Min.
Low Temperature Flexibility1" Mandrel Bend-10º F Pass
Viscosity375º F35 Poise Max.
Ductility77º F30 cm Min.
Specific Gravity1.23 Approximately
Asphalt CompatibilityPass
Flash Point400º F Min.

Product Highlights

  • Low Penetration
  • Self Leveling
  • Rapid Melting
  • Flexible to -10°F
  • Resists Tracking


WidthDepthPounds/100 Linear Feet


P&T Products’ Specifications


Dura-Fill is packaged in 30lb poly bags and boxed in high-strength corrugated cardboard. Each pallet contains 75 boxes or 2,250lb of Dura-Fill.
Now also available in Dura-Melt Consumable Packaging.