IPA means isopropyl alcohol, also called isopropanol. UKHSA describes it as highly flammable. Treat choosing a concentration and choosing a storage arrangement as two separate jobs. Checked 25 October 2026.
Buy against an instruction, not a generic rule
Use the concentration stated for your exact resin and equipment. Formlabs' IPA guidance distinguishes ordinary and biocompatible materials; that is a reminder that one material's specification does not cover another. A household cleaning product is not a substitute merely because its label mentions alcohol. Checked 25 October 2026.
Keep the solvent supplier's SDS. It describes the mixture you actually bought and is the primary source for its handling, storage and protective-equipment requirements.
Plan storage before opening the bottle
Use labelled, compatible containers and keep them closed when idle. Separate the working area from ignition sources and avoid accumulating liquid you have no suitable place to store. HSE's storage guidance addresses workplaces; its emphasis on closed containers, suitable storage and controlled quantities is useful context, not a household legal limit. Checked 25 October 2026.
Keep use and disposal in the same plan
Write down which container is fresh liquid and which is contaminated. Do not judge waste by whether it looks clear. Follow the disposal guide and ask the receiving service what it accepts before your waste container fills. For shopping decisions, the IPA planning tool uses your own amounts rather than an invented consumption rate.