Product Data Sheet
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Hot-Applied Parking Lot Sealant
DIRECT FIRE is formulated specifically for melting and heating in direct fire kettles. It is a single-component, hot-applied, self-leveling sealant to be used for sealing joints and cracks in Portland cement or asphalt concrete pavements. DIRECT FIRE is easily melted and applied, and will form a flexible, resilient, non-tracking seal suitable for use on both highways and parking lots.
|Test||Typical Result||Recommended Specification|
|Penetration, 77° F dmm||50||15-75|
|Resilience, %:||55%||40% (min.)|
|Softening point, °F||210° F||200° F (min.)|
|Flexibility, 90° bend, 1″ mandrel @ 0 °F||Pass||Pass|
|Viscosity @ 400° F||5000 cps|
Maximum Safe Heating
Temperature: 450° F
Temperature: 400° F
50 lb. Carton
Carton contains two (2) 25-pound blocks individually wrapped in polybag liners.
Melting … Material can be melted in either a direct-fire or oil-jacketed kettle. Kettles shall be equipped with an agitator and properly functioning temperature gauges. The polymers contained in DIRECT FIRE can withstand temperatures up to 450° F.
After melting, the material must be agitated mechanically. Material may be added as the sealant is drawn off. The product is capable of being reheated several times.
Surface Preparation … Joints and cracks to be sealed must be clean and dry. Dust, dirt, and laitance should be removed prior to application. Proper routing should be slightly larger than the existing crack/joint to ensure proper adhesion to sidewalls.
Concrete or Asphalt Pavement and Maintenance Sealing … For ideal sealing with maximum effectiveness, it is suggested that cracks or joints be routed out to provide a sealant reservoir 1/2″ (12.7 mm) wide with a minimum depth of 1/2″ (12.7 mm). This provides for a 1:1 width-to-depth ratio. For joints 1″ (25.4 mm) wide, the suggested depth is 1/2″ (12.7 mm) minimum. To control and maintain the suggested joint depth and sealant usage, CERA-RODTM, heat-resistant backer rod from W. R. MEADOWS may be installed in the joint opening.
Sealant Application … Material can be applied by pressure applicator or pour pot. Material should be applied between 350° F and 450° F. The recommended application temperature is 400° F. The sealant should be applied into the crack/joint, slightly overfilling. For optimum performance, a follow-up should be done with a soft rubber, U-shaped squeegee to form a wipe zone of approximately 3 – 4″ (76.2 – 101.9 mm) wide along the crack/joint and flush with the highway or pavement surface. The crack-filler should be tack-free prior to coating with a blacktop sealer.
DIRECT FIRE can be reheated several times. Temperatures above 400° F (204.4° C) for extended periods (over six hours) will begin to soften the material. If heated above 450° F (232.2° C), the material will degrade and lose its flexibility.
Avoid direct contact with heated material, as it may cause severe burns. Avoid inhalation of product fumes/vapors. If contact with heated material occurs, cool area with water and seek medical attention. Do not attempt to remove congealed solid from skin. Refer to Material Safety Data Sheet for complete health and safety information.