For the digestion of small sample volumes up to 0.5g in microwave ovens. Made of isostatically pressed, high-grade PTFE (TFM). The chemical resistance and usual PTFE properties remain unchanged. TFM is a modified PTFE by Hoechst and contains thermoplastic elements. This gives rise to a homogeneous, non-porous surface. Contaminating residues from earlier digestions are therefore avoided. Resists pressure deformation (to max. 25 bar) and temperature (max. 160 °C). An accessory burst-proof, sealing membrane prevents loss of volatile compounds and provides safety against overpressure. Optional digestion vessels with interchangeable inserts (internal liners) enable precise weighing-in (in most cases the complete vessels would be too heavy for balances). In addition, different digestion processes can be carried out in only one basic vessel by using several inserts.