About Postek

Quality Management Framework Postek (HK) Co., Limited operates under a structured quality management system aligned with high-reliability industrial and aerospace industry standards. All products undergo qualification testing per GJB 809B-2013 (General Specification for Micro Switches) and GJB 360B-2009 (Test Methods for Electronic Components). Certification Framework Standard Scope Applicable Products GJB 809B-2013 Micro Switch General Specification All HK Series micro switches GJB 360B-2009 Test Methods for Electronic Components Vibration, shock, thermal, sealing MIL-PRF-8805 Switches, Sensitive (US equivalent) Cross-reference qualification Q/MA20347/Z-2019 KWQM4 Series Detail Spec (J/Z Grade) KWQM4 Series YHYB S1201/001-2013 Space-Grade KWQM4-4Z Detail Spec Space applications CASTPS04/026-2018 high-altitude platform Procurement Spec CAST-grade products Quality Grades J/Z Grade (high-reliability industrial): Q/MA20347/Z-2019 — Full high-reliability industrial qualification Space Grade: YHYB S1201/001-2013 — high-altitude platform-level qualification CAST Grade: CASTPS04/026-2018 — China Academy of Space Technology procurement standard GB Standard: ZZR-Q/MA20433-2019 — General industrial standard Inspection Process Incoming Material Inspection — Raw materials verified against specifications In-Process Inspection — Critical dimensions and assembly checks during production Final Inspection — 100% functional testing + environmental sampling per GJB 360B Seal Integrity Test — Helium mass spectrometer leak detection (≤1×10⁻³ Pa·cm³/s) Lot Acceptance Test — Per applicable detail specification (vibration, shock, thermal cycling)

Supply Chain Overview Postek (HK) Co., Limited operates a Hong Kong-based supply chain with OEM manufacturing partnerships at qualified Chinese mission-critical-electronics facilities. Products are warehoused and shipped from Hong Kong, ensuring reliable international logistics and export compliance. Manufacturing Partnerships HK Series products are manufactured by qualified OEM partners holding the following certifications: GJB 9001C (high-reliability industrial Quality Management) AS9100D (Aerospace Quality Management) ISO 9001:2015 All manufacturing partners undergo periodic quality audits and source inspection by Postek engineering staff. ...

Testing Capabilities All HK Series products undergo qualification and acceptance testing per GJB 360B-2009 and applicable detail specifications. The following test capabilities are available for customer verification and custom qualification programs. Environmental Testing Test Standard Capability Sinusoidal Vibration GJB 360B-2009 10–2000 Hz, 15G, 3 axes Random Vibration GJB 360B-2009 (Grade D) 0.04–1.0 g²/Hz, 119.5 m/s² Grms Shock GJB 360B-2009 100G, 11ms half-sine Thermal Cycling GJB 360B-2009 -184°C to +260°C Humidity GJB 360B-2009 10 days Salt Spray GJB 360B-2009 96 hours Altitude GJB 360B-2009 Up to 70,000 ft equivalent Hermetic Seal Testing Helium mass spectrometer leak detection per GJB 360B-2009: ...