Services | Beijing ZKGX Research Institute

Silk testing: raw silk to GB/T 1798-2008, and silk fabric to GB/T 15552-2015 plus the GB 18401 safety categories (A/B/C) — not the Silk Test software tool — Beijing ZKGX.

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Hand warmer testing

Hand warmer testing: storage-type to GB 4706.1/4706.99 and rechargeable lithium to GB 31241-2022 + GB 4943.1, with CCC certification — Beijing ZKGX Research.

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Power Frequency Magnetic Field Immunity

Power frequency magnetic field immunity testing to IEC 61000-4-8 / GB/T 17626.8: continuous and short-duration levels, the three magnetic siblings, performance criteria — Beijing ZKGX.

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Edible Mushroom Testing

Edible mushroom testing to GB 7096-2014: sensory & physicochemical quality, heavy metals (GB 2762), pesticide residues (GB 2763), ready-to-eat pathogens — Beijing ZKGX.

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Crystal Oscillator Testing

Crystal oscillator testing to IEC 60679-1 / GB/T 12274.1: frequency tolerance, stability, aging, phase noise, CL match, and the total error budget — Beijing ZKGX Research.

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Environmental Stress Screening (ESS)

Environmental stress screening (ESS): precipitation vs detection, thermal cycling + NAVMAT P-9492 random vibration, ESS vs HALT vs HASS, and the real status of MIL-STD-2164 / HDBK-344A — Beijing ZKGX Research.

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Damp Heat Cyclic Test

Damp heat cyclic test (IEC 60068-2-30 / GB/T 2423.4, Test Db): the 24-hour 12+12 h cycle profile, variants, severity, and how it differs from steady-state damp heat — Beijing ZKGX Research.

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Electromagnetic Relay Testing

Electromagnetic relay testing per IEC 61810-1 / GB/T 21711.1-2023: coil resistance, contact resistance at 6 V/10 mA, operate/release values, endurance and B10 — Beijing ZKGX Research lab procedures.

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Inductor Testing

Inductor testing as LCR characterisation: L, Q, R_DC, SRF and saturation current (I_sat) under DC bias, per GB/T 40853 / IEC 62024 and GB/T 8554 / IEC 61007.

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Transistor Testing

Transistor testing as semiconductor characterisation: BJT h_FE, leakage, breakdown and switching on a curve tracer, and MOSFET/JFET/IGBT under GB/T 4587 / IEC 60747-7/8.

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Solid-State Relay (SSR) Testing

Solid-state relay (SSR) testing as semiconductor characterisation: on-state V_T, off-state leakage, zero-cross, endurance, EMC and isolation per GB/T 36640 / IEC 62314.

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Common-Mode Rejection Ratio (CMRR) Testing

CMRR testing across three device classes: op-amp IC (IEC 60748), medical ECG/EEG (IEC 60601-2-25 / YY 0782), and differential probe — with the 5-setup discrepancy.

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Integrated Circuit (IC) Testing

Integrated circuit testing across wafer (CP) and package (FT) levels, DFT (scan/BIST/IEEE 1500), 3D-IC and SoC, under GJB 597B/MIL-PRF-38535 and GB/T 17574/SJ/T

139

Optoelectronic Device Testing

Optoelectronic device testing for LED, laser diode, photodiode, image sensor and PIC: LIV/spectral/reliability per IEC 60747-5, GB/T 15651, SJ/T 11394, GB/T 33768

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Electronic Component Testing

Electronic component testing across six categories — electrical, environmental, life, EMC, counterfeit (AS6171), FA — under MIL-STD-883/GJB 548C and GB/T 4937.

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Beta-Arbutin Testing

Beta-arbutin testing across three matrices: cosmetic active (NMPA 4-原料, QB/T 4953, HILIC α/β resolution), UTI-drug assay, and bearberry supplement.

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Ellagic Acid Testing

Ellagic acid testing across three matrices: food/plant RP-HPLC (hydrolysis + DMA stabilisation), cosmetic QB/T 5295-2018 (SPE), and herbal marker compound.

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Candida albicans Testing

Candida albicans testing across three services: product release (ISO 18416, GB 4789.15, ChP), clinical detection (culture, BDG, T2Candida), and CLSI AFST.

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Bisphenol A (BPA) Testing

BPA testing across four services: FCM migration (GB 4806, EU 2024/3190 1 µg/kg), BPA-NI bisphenol panel (BPS/BPF), urinary biomonitoring, and drinking water.

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Pepsin Potency Testing

Pepsin potency testing across four contexts: pharmacopoeia (ChP hemoglobin/Folin/L-tyrosine), Anson A280, FCC/JECFA egg-albumen, INFOGEST, salivary biomarker.

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Salicylic Acid Testing

Salicylic acid testing across four matrices: pharmaceutical assay (ChP free-SA ≤1.5 %), cosmetic BHA (GB/T 35954), clinical salicylate level, and food additive.

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Strain Identification

Microbial strain identification across four methods: phenotypic, MALDI-TOF MS, 16S rRNA/ITS sequencing, and whole-genome ANI; with GB 31615.2 and GB 4789.28.

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Nicotinamide Testing Explained

Nicotinamide (vitamin B3) testing across three matrices: food/feed/supplement content (GB 5009.89, GB 7301), clinical status (urinary NMN+2-Pyr), cosmetic assay.

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Pseudomonas aeruginosa Testing

Pseudomonas aeruginosa testing across three matrices: water surveillance (HTM 04-01/ISO 16266), product release (GB/T 7918.4, GB 15979), and clinical AST.

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Ivermectin Testing

Ivermectin testing across three matrices: biological-fluid LC-MS/MS (PK/TDM), veterinary residue to GB 31658.16/31650, and pharmacopoeia drug-product assay.