How should I select contact materials for a packaging machine handling corrosive products?
• Test product pH and chloride level; use 316L or PTFE if pH<4 or Cl⁻>50ppm.
• Ban carbon steel and aluminum on contact parts; use FKM or PTFE-encapsulated seals, not EPDM.
• Specify 316L or titanium for heat-seal jaws and formers with Ra≤0.8μm surface finish.
• Require material certificates and 48h salt-spray or immersion corrosion test reports.
• Perform FAT media compatibility test to confirm no pitting, swelling, or weight change.
• Ban carbon steel and aluminum on contact parts; use FKM or PTFE-encapsulated seals, not EPDM.
• Specify 316L or titanium for heat-seal jaws and formers with Ra≤0.8μm surface finish.
• Require material certificates and 48h salt-spray or immersion corrosion test reports.
• Perform FAT media compatibility test to confirm no pitting, swelling, or weight change.