Crack and Joint Sealant for Moderate Climates
Description: Dura-Fill 620 is a hot pour crack and joint sealant for portland cement and asphaltic pave-ments. As an economical and effective preventative maintenance treatment, Dura-Fill 620 prolongs pave-ment life by sealing cracks and joints from water penetration, which cause base failure and pot holes. This is a high viscosity, non self-leveling material with a crumb rubber content of 18% minimum based on as-phaltic components or 13% minimum by overall weight. Dura-Fill 620 forms a long-lasting seal which resists tracking in warm temperatures and remains flexible in cold temperatures.
Recommended Uses: Dura-Fill 620 is recommended for sealing cracks and joints in portland cement and asphaltic pavements. It is designed to seal expansion and contraction joints, longitudinal and transverse 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 620 using a conventional oil jacketed kettle equipped with agita-tor and temperature control devices for both the material and heat transfer oil. Carefully insert small quanti-ties 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. The material may be safely reheated.
For further details read and follow the Dura-Fill SDS, Installation Instructions for Oil Jacketed Dura-Fill Products and P&T Products’ Warranty.
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.
|Maximum Safe Heating Temperature||400º F Max.|
|Application Temperature||370º-390º F|
|Heating Time||12 Hours Max.|
|Penetration||77º F||70 dmm Max.|
|Resiliency||77º F||40% Min.|
|Flow||140º F||3 mm Max.|
|Bond||0º F / 50 % Extension||5 Cycles Passed|
|Softening Point||195º F Min.|
|Crumb Rubber Content||By Weight of Asphaltic Components||18% Approximately|
|Viscosity||375º F||100 + Poise|
|Specific Gravity||1.14 Approximately|