Ground and Heli-torches require gelled fuel. Flash 21 is a two-part liquid fuel gelling agent that reliably provides high quality gel, fast. Fuel thickened with Flash 21 achieves ideal viscosity with no settling. Flash 21 can be mixed with various fuels including straight gasoline, diesel, Jet A or Jet B if available. Using Jet A alone will produce a good gel but because of the low flash point of this type of fuel, you may need to add 20-30% straight gas to produce a better ignition point. Flash 21 was developed to allow mixing with fuel regardless of temperature, ensuring a consistent gelled fuel mixture. Fuel treated with Flash 21 will not lose viscosity, allowing use during an entire burning operation. For additional information on safety and handling, please refer to the product labels and Material Safety Data Sheets which are available for both products. Studies have shown Flash 21 to be both stable and effective. Flash 21 is designed to be added to fuel as two parts, A and B, one liter of each. One box of Flash 21 has 12 liters of product, six of Flash 21 A and six of Flash 21 B. One liter of A and one liter of B will gel 55 U.S. gallons of fuel. Freezing does not adversely affect either part A or B; once the product thaws it can effectively be used. Under cold weather conditions it is recommended that a 10-25% blend of regular gasoline is used when mixing Jet A, Jet B or diesel fuel. High temperature has no impact on any of the standard fuels.