Open blasting is an outdated and highly dangerous method of cannabis extraction used in the early days of making Butane Hash Oil (BHO) or Butane Honey Oil. In this process, a solvent, typically butane or propane, is placed in a metal or glass container with cannabis plant material. The solvent is then used to “blast” the trichomes off the cannabis, extracting concentrated cannabinoids and terpenes.
The name “open blasting” is derived from the fact that this extraction method occurs in an open system, lacking the safety measures and controls found in modern closed-loop extraction systems. Closed-loop systems have become the industry standard in states with legal cannabis, as they provide a much safer and more controlled environment for extracting cannabis concentrates.
The dangers of open blasting arise from the use of flammable solvents in an unenclosed setup. As the butane or propane evaporates and accumulates in the room, the risk of an explosion increases significantly. Even a minor spark from nearby devices or electrical outlets can lead to catastrophic accidents.
Due to its hazardous nature and the numerous safety concerns, open blasting is no longer used or permitted in any state that has legalized cannabis. The method lacks proper safety protocols and professional supervision, making it unsuitable for licensed cannabis extraction.
Today, safer and more efficient extraction methods like closed-loop systems have replaced open blasting. Closed-loop systems involve pressurizing cannabis material and solvents within a sealed tube, reducing the risk of accidents and ensuring a controlled and safer extraction process. These modern methods also require less solvent and result in higher-quality cannabis concentrates, making them the preferred choice for commercial production and consumption.