State Cosmetic Ingredient Bans Testing
2026-09-09State cosmetic ingredient bans testing verifies whether cosmetics comply with state-level prohibitions on substances such as PFAS, phthalates, parabens, formaldehyde releasers, coal tar dyes, and heavy metals. Testing proceeds from matrix-based sampl
Pesticide Residue Analysis in Fruits and Vegetables: Methods, Matrices and Regulatory Limits Testing
2026-09-04Pesticide residue analysis in fruits and vegetables combines representative sampling, acetonitrile-based extraction and cleanup, and confirmatory LC-MS/MS or GC-MS multi-residue screening, with ELISA and biosensors for rapid field triage. Method vali
LC-MS/MS Pesticide Residue Testing: How the Method Works and When to Choose It
2026-09-04LC-MS/MS pesticide residue testing quantifies trace pesticide residues via LC separation, electrospray ionization and triple-quadrupole MRM detection, using QuEChERS extraction and dispersive cleanup. It reaches low ppb sensitivity, covers polar and
Pesticide Residue Analysis Methods: A Complete Guide to GC-MS, LC-MS/MS and Multiresidue Screening T
2026-09-04Pesticide residue analysis identifies and quantifies trace agrochemical residues in food and environmental matrices. GC-MS covers semi-volatile classes such as organophosphorus and pyrethroid pesticides; LC-MS/MS handles polar, thermolabile compounds
Transformer Oil Breakdown Voltage Testing: IEC 60156 & ASTM D877 Explained
2026-09-04Transformer oil breakdown voltage testing measures the dielectric strength of insulating oil by raising an AC voltage across standard electrodes until breakdown occurs. IEC 60156 uses spherical-cap electrodes and reports the mean of six breakdowns; A
Insulating Oil Diagnostics: A Complete Guide to Transformer Oil Testing Programs
2026-09-04Insulating oil diagnostics evaluates transformer oil through dissolved gas analysis by gas chromatography, physical–chemical property testing, and electrical strength measurement. Samples are taken from transformers, reactors, bushings, and tap chang
Furan Analysis in Transformer Oil: Estimating Paper Insulation Aging and Remaining Life Testing
2026-09-03Furan analysis estimates cellulose paper aging in oil-filled transformers by quantifying furan compounds, chiefly 2-FAL, dissolved in the insulating oil. Oil is sampled from the transformer, extracted with acetonitrile, and analyzed by HPLC with UV d
Insulating Oil Quality Analysis to ASTM D3487 and IEC 60422: Test Parameters and Limits Testing
2026-09-03Insulating oil quality analysis to ASTM D3487 and IEC 60422 measures moisture, breakdown voltage, dissolved gases, acidity, dissipation factor, resistivity, and inhibitor content against defined limits for new and in-service oil. Karl Fischer titrati
Moisture in Insulating Oil: Karl Fischer Titration Methods and Acceptance Limits Testing
2026-09-03Moisture in insulating oil is measured by Karl Fischer titration under ASTM D1533 or IEC 60814, using coulometric KF for low mg/kg levels and volumetric KF or oven evaporation for higher or interfering matrices. Sound sampling, drift control, and dup
Resist Thickness Testing: Measurement Methods, Accuracy, and Lab Services Explained
2026-09-03Resist thickness testing measures the vertical dimension of photoresist films on wafers, masks, and circuit substrates, typically from nanometers to several micrometers. Mainstream methods include broadband reflectometry for rapid non-contact mapping
Biotechnology in cosmetics: Hyaluronic Acid Ingredients Testing
2026-09-02Hyaluronic acid ingredients testing verifies the identity, content, and molecular weight distribution of this fermentation-derived cosmetic moisturizer. Content is determined by the carbazole colorimetric assay or by HPLC after enzymatic digestion, w
Biotechnology in cosmetics: Collagen Beauty Products Testing
2026-09-01Collagen beauty product testing verifies identity, content, peptide size, and safety in one integrated workflow. After matrix-specific pretreatment, hydroxyproline colorimetry and ELISA quantify total and species-specific collagen; SEC-HPLC and SDS-P
Biotechnology in cosmetics: Chitosan Cosmetics Testing
2026-08-31Chitosan cosmetics testing verifies the identity and content of this deacetylated chitin biopolymer in creams, serums, masks and hair products. Identity is confirmed by FTIR, ¹H NMR and GPC, which also yield degree of deacetylation and molecular weig
Biotechnology in cosmetics: Polynucleotides in Aesthetic Products Testing
2026-08-29Testing of polynucleotides in aesthetic products centres on three pillars: content assay by UV spectrophotometry at 260 nm and anion-exchange HPLC, molecular weight distribution by agarose gel electrophoresis and SEC-HPLC, and co-tests for endotoxin,
Specialty Chemicals Testing
2026-08-25Specialty chemicals testing verifies identity, purity, trace impurities, and functional performance across liquids, powders, and formulations. The workflow spans representative sampling, controlled pretreatment, HPLC and GC-MS assay and impurity prof
Lubricants & Greases Testing
2026-08-22Lubricants and greases testing involves systematic sampling, standardized physical/chemical analyses, and comparison to performance specifications. Key methods include viscosity measurement, elemental spectroscopy, FTIR, and chromatography. Results d
Petrochemicals Testing
2026-08-21Petrochemicals testing verifies the composition and physical behavior of hydrocarbon streams and finished petrochemical products. It combines GC-MS and HPLC for identification and quantification of components and impurities, physical methods such as
Beauty & Personal Care Testing
2026-08-20Beauty and personal care testing verifies safety, quality and label claims across creams, shampoos, makeup and other products. Core methods include ICP-MS heavy metal analysis, in vitro toxicology assays, plate counts and PCR for microbial detection,
Basic & Industrial Chemicals Testing
2026-08-18Basic & Industrial Chemicals Testing verifies the identity, purity, and physicochemical properties of acids, alkalis, salts, solvents, and intermediates using GC-MS, HPLC, ion chromatography, titration, Karl Fischer, and related techniques. Sampling,
Facial Mask Testing
2026-07-21Facial mask testing verifies microbiology, heavy metals, preservative efficacy, and claims per ISO 17516, ISO 11930, QB/T 2872, and EU 1223/2009. Beijing ZKGX explains.
Palm oil testing
2026-07-17Palm oil testing per GB/T 15680: DOBI (A446/A269), 3-MCPD esters (GB 5009.191-2024, palm oil highest), FFA, IV, slip melting point, fractionation products. Beijing ZKGX lab.
Anti-Static Coating Testing
2026-07-13Anti-static coating testing per GB/T 16906 and HG/T 4570: conductive <10⁶ Ω, dissipative 10⁶-10⁹ Ω, static decay 5000→500 V ≤2s, friction ≤100 V. Beijing ZKGX.
Alkylphenol ethoxylates (APEO) testing
2026-07-13APEO testing per GB/T 23322-2018: NP, OP, NPEO, OPEO by LC-MS/MS. Food contact NP migration under GB 31604.50, 0.003 mg/kg LOD. REACH 100 mg/kg. Beijing ZKGX.
Hull paint testing
2026-07-13Hull paint testing per GB/T 6822-2024: shallow-sea immersion (GB/T 5370), copper release rate, adhesion, cathodic disbondment, VOC compliance. Beijing ZKGX lab.
Coconut Oil Testing
2026-07-13Coconut oil testing per NY/T 230: iodine value 7-12.5, saponification 248-265, lauric acid 45-52%, full fatty acid profile by GB 5009.168. Beijing ZKGX.
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