Process flow

1. NPTH's PTFE sheet processing flow

Cutting - Drilling - Dry Film - Inspection - Etching - Corrosion Inspection - Solder Mask - Character - Tin Spray - Forming - Testing - Final Inspection - Packaging - Shipping

2. PTFE sheet processing flow of PTH

Cutting - drilling - hole treatment (plasma treatment or sodium naphthalene activation treatment) - copper sinking - board electricity - dry film - inspection - drawing electricity - etching - corrosion inspection - solder mask - character - tin spraying - forming - testing - final Inspection-Packaging-Shipment