You say that the Rusmar foams add negligible amounts of material and water to the excavation site. Can you be more exact?
Certainly. For the AC-645 and AC-667SE foams under standard use conditions 1 drum (53 gallons) of foaming concentrate will deliver 8416 gallons of foam when mixed with 347 gallons of water! So, by volume just 0.06% of the foam produced is foaming agent, 4.1% is water and the remaining 95.2% is air. For the direct use 900 series products, the concentration of foaming agent is higher because the products are used “neat” with no additional water. 1 drum will produce 1060 gallons of foam for a contribution by volume of just 5%. The remaining 95% is air.
