Heating & Melting Guide for Bagged and Drummed Bitumen

Bitumen arrives solid in drums and bags. Getting it from solid to sprayable without damaging the binder — or endangering the crew — is a matter of the right equipment and temperature discipline.

Drummed bitumen

Use a drum decanter or drum heater designed for bitumen: drums are heated in a chamber and tipped into a melting tank. Never apply open flame directly to drums, and never heat a sealed drum — pressure build-up can rupture it. Decant into a tank with controlled heating and circulation.

Bagged bitumen

Framed jumbo bags are designed for a bag-melting unit: the bag (with its meltable inner liner) is lifted into the melter, and the frame is removed as the block melts down. Keep melters fed steadily rather than overloading, which creates cold lumps and long melt times.

Temperature discipline

Work within the temperature guidance for your grade and mix design. As general practice: store and melt at the lowest temperature that keeps the binder workable, avoid prolonged holding at maximum temperature (which ages and hardens the binder), and never exceed the flash-point safety margin — keep heating media and hot-oil systems well maintained. Typical mixing temperatures for penetration grades sit roughly in the 140–165°C band depending on grade and mix; your mix design governs.

Common mistakes

• Direct flame on drums or bags — fire risk and local overheating that ruins binder.
• Repeated re-heating of the same tank stock — accelerates ageing; plan melt quantities to daily use.
• Water contamination — wet aggregates or water in tanks cause foaming and boil-over risk; keep storage dry.
• No thermometer discipline — an inexpensive probe thermometer prevents most quality complaints.

Questions about your specific setup? Send us a photo of your melting equipment with your inquiry and we will advise on packing and procedure.

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