... ±0.076mm9. Certificate: UL, ISO900110. Test: 100% Function-test11.Surface finishing:HASL,LEADFREE HASL,Immersion gold,Immersion tin,Immersion Silver ... 1. PCBA design (or sample from customer)2.Punching3. Surface mount assembly4. Electronic assembly5 Testing Advantage:1.Making a sample fast2 ... )Puncher±0.10mm(4mil) Warpage 0.7%-1% Surface Treatment or Pad HAL,Chemical Gold,Chemical Tin,Chemical Silver ...