Asphalt Best Practices

TrumbullFumingWe are committed to asphalt safety, from research to manufacturing to on-the-job handling. Trumbull® PermaMop® and TruLo® asphalt polymer products are revolutionary in their dramatic reduction of asphalt fumes at the kettle. When heated, the polymer additive floats to the surface, creating a skim layer on the kettle that traps fumes and retards heat loss without affecting the asphalt or disrupting kettle operations.

Kettle Operation

The following is a guide to the proper handling of Trumbull® Asphalt low-fuming products:
  • When adding asphalt to the kettle, some fuming may be expected. However, it will die down as soon as the skim layer has completely reformed over the disturbed area.

  • Do not remove the skim layer. If removed, the low-fuming benefits will be lost.

  • Replenish the kettle frequently during use. This practice will feed and maintain the skim layer throughout the day.

  • Try to keep the molten asphalt in the kettle at a full but safe level, keeping in mind the safe operating parameters of your kettle. The lower the level, the more the skim layer is disturbed by the recirculation pump return, possibly causing additional fuming. Agitation also contributes to faster skim layer dissolution. Once the polymer additive has dissolved, the skim layer will not form again unless new product is added.

  • Avoid a very low molten asphalt level. If the level is close to the pump intake, a high polymer concentration from the skim may be pumped to the roof, which may provoke spreader and pipe clogging (in extreme cases).

  • Turn the pump off when asphalt is not going to be pumped to the roof for an extended period of time. This will reduce agitation of the skim layer.

  • Abstain from running the kettle hot for an extended period of time without reloading product. Long periods of excessive temperature will reduce the skim layer thickness.


Keep a close watch on the temperature of the molten asphalt. Since these are low-fuming asphalt products, odor alone is NOT an indication of the asphalt temperature. Use an appropriate and accurately calibrated temperature probe (IR guns are not reliable because the skim layer will give off a false reading). Excessive temperature will not only damage the low-fuming characteristics of the product, but may also degrade the asphalt causing “asphalt dropback.” Always keep asphalt kettle temperatures at least 25°F below asphalt flash point. Once the skim layer is formed and the kettle temperature is reached, you may not have to add as much heat from the propane bottle because the skim level helps to keep heat in the kettle.

When the kettle is turned off, the skim layer will cool with the asphalt. Its surface will be harder than regular asphalt. The kettle can be safely restarted the next day following the same procedures used with regular asphalt.


Panther Paws