Specifications Alloy: Sn42/Bi57.6/Ag0.4. Flux Type: Synthetic Water-Soluble. Flux Classification: REM0 (Residue must be water-washed at 60C+ after reflow). Metal Content: 90% metal by weight. Particle Size: T4 (20-38 microns). Melting Point: 138C (281F). Size: 500g cartridge.