Solvent Purity Standards and Extraction Grade™ Testing
We follow strict process controls and quality standards to verify the cylinder’s purity throughout the process. Each cylinder goes through our proprietary cleaning process to eliminate residues left over from manufacturing, including:
- Metal shavings
- Mill scale
- Residual oils
- Weld slag
- Particulates
Third-party tests have proven that our cleaning process effectively reduces residual particulates and oil from cylinders. While passive distillation can remove some solids, the process cannot remove contaminants with a similar chemical composition, such as benzene or hexane.
Refilling the tanks includes the following steps to ensure quality and prevent top filling:
- Evacuation: The residual gas product and potential contaminants are removed from the tank.
- Inspection: The inside of the tank is inspected and washed if it is required for cleanliness standards.
- Vacuum: Air and moisture are removed from the inside for a safe gas fill.
- Fill: The tank is filled to maximum capacity, as determined by the Department of Transportation (DOT), allowing space for fuel expansion and spillage prevention.
- Analysis: The tanks are inspected and certified with a Certificate of Conformance (COC), ensuring their compliance with regulatory standards for safety and technical standards. We complete analysis and traceability in our on-site laboratory using a flame ionization detector. This detector certifies the product at parts per million.