Crack and Joint Sealant for Moderate Climates

General Information

Description: Dura-Fill 320 is a hot pour crack and joint sealant for portland cement and asphaltic pavements. As an economical and effective preventative maintenance treatment, Dura-Fill 320 prolongs pavement service life by sealing cracks and joints from water penetration, which causes base failure and pot-holes. Dura-Fill 320 is formulated with select asphaltic resins, synthetic polymeric rubbers, plasticizers, stabilizers and a blend of organic and inorganic reinforcing fillers. When properly melted and applied, Dura- Fill 320 forms a long-lasting seal to both cement and asphaltic pavements. The sealant resists tracking in warm climates. 

Recommended Uses: Uses: Dura-Fill 320 is recommended for sealing cracks and joints in portland cement, asphaltic pavements and parking lots. It is designed to seal expansion and contraction joints, longitudinal cracks, joints between concrete and asphaltic shoulders and random cracks. 

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

Melting and Application: Melt Dura-Fill 320 using a conventional oil jacketed kettle equipped with agitator and temperature control devices for both the material and heat transfer oil. 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 kettle lines at the end of each sealing operation.

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 Oil Jacketed Dura-Fill Products and P&T Products’ Warranty. 

Product Specification Table

Maximum Safe Heating Temperature400º F Max.
Application Temperature370º-390º F
Heating Time12 Hours Max.
Penetration77º F50 dmm Max.
Penetration39.2º F15 dmm Min.
Resiliency77º F40% Min.
Flow140º F0 mm Max.
Softening Point200º F Min.
Low Temperature Flexibility1" Mandrel Bend0º F Pass
Viscosity375º F100 Poise Max.
Specific Gravity1.19 Approximately
Asphalt CompatibilityPass
Flash Point400º F Min.
Optimum ClimateAverage Temperatures-17º / 37º C Or 0º / 100º F

Product Highlights

  • Flexible to 0°F
  • Economical
  • Excellent Adhesion
  • Rapid Melting
  • Quick Set Up
  • Resists Tracking


WidthDepthPounds/100 Linear Feet


P&T Products’ Specifications
Exceeds ASTM D 5078


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.