Direct-to-chip / TCS loops
PG25 and water-glycol coolant testing
Condition testing for direct-to-chip PG25 and water-glycol coolant loops, from new-fluid baseline through routine monitoring and investigation.
Analytical position
Test the fluid that is actually in service.
A PG25 label is a starting point, not a complete condition statement. The analytical program must distinguish the named product, concentration basis, inhibitor chemistry, system materials and product-specific limits before results can be interpreted responsibly.
Condition signals
What we can examine.
Identity, concentration, freeze point and FTIR fingerprint
pH, reserve alkalinity, conductivity and product-specific UV-Vis
Chloride, sulfate and degradation-acid profile
Elements selected from the wetted-material list
Appearance, sediment and matrix-validated cleanliness
Thermal properties and OCP-aligned corrosion screening when required
Questions the report should answerHuman review
Are inhibitors, ionic contamination or metals moving in the wrong direction?
Does the result fit the correct product, OEM and loop-specific limits?
Each answer combines suitable results, baseline history and operating context. No conclusion rests on one isolated number.
Supplementary spectroscopy
Use fingerprints only with the right reference sample.
Matched-reference fingerprinting
FTIR compares the sample with matched new-fluid and commissioning references to screen for identity or organic-formulation change. It does not create a universal PG25 pass or fail limit.
Product-specific targeted assay
UV-Vis can track selected UV-active formulation or degradation markers only when the named product supports a validated wavelength, calibration and interference check.
Representative methods
See the analytical basis for this fluid.
These are representative methods. The final analytes, limits, detection requirements and combinations are confirmed for the named product and operating question.
ASTM D3321Water-glycol heat-transfer fluids
Approximate freeze point and percent glycol by refractometer
Rapid PG and water concentration and approximate freeze-point screening using the correct propylene-glycol scale. This is an approximate check, not a complete coolant-condition result.
Review methodASTM D3321Approximate freeze point and percent glycol by refractometer
Water-glycol heat-transfer fluids
Rapid PG and water concentration and approximate freeze-point screening using the correct propylene-glycol scale. This is an approximate check, not a complete coolant-condition result.
Review official scopeASTM D1287Aqueous heat-transfer fluids
pH of aqueous heat-transfer fluids
pH measurement for the named aqueous coolant, trended against the correct product baseline. Do not use pH alone to infer corrosion protection or remaining life.
Review methodASTM D1287pH of aqueous heat-transfer fluids
Aqueous heat-transfer fluids
pH measurement for the named aqueous coolant, trended against the correct product baseline. Do not use pH alone to infer corrosion protection or remaining life.
Review official scopeASTM D1121Water-glycol heat-transfer fluids
Reserve alkalinity by titration
Reserve-alkalinity titration only where the named product and documented applicability review support it. It is not a direct measure of corrosion protection or remaining life.
Review methodASTM D1121Reserve alkalinity by titration
Water-glycol heat-transfer fluids
Reserve-alkalinity titration only where the named product and documented applicability review support it. It is not a direct measure of corrosion protection or remaining life.
Review official scopeASTM D5827Water-glycol heat-transfer fluids
Chloride and selected anions by ion chromatography
Targeted chloride and anion measurement for a named formulation after documenting suitability, calibration range and interference checks.
Review methodASTM D5827Chloride and selected anions by ion chromatography
Water-glycol heat-transfer fluids
Targeted chloride and anion measurement for a named formulation after documenting suitability, calibration range and interference checks.
Review official scopeASTM D6130Water-glycol heat-transfer fluids
Dissolved and dispersed elements by ICP-AES
Elemental screening with a validated preparation and calibration route and an element list tied to the formulation and wetted materials. The method does not separate dissolved from particulate material.
Review methodASTM D6130Dissolved and dispersed elements by ICP-AES
Water-glycol heat-transfer fluids
Elemental screening with a validated preparation and calibration route and an element list tied to the formulation and wetted materials. The method does not separate dissolved from particulate material.
Review official scopeASTM E1252Materials suitable for qualitative infrared analysis
General techniques for qualitative infrared spectra
General acquisition practice supporting matched-reference qualitative FTIR comparison. It is not a product-identification method, quantitative assay or pass/fail specification.
Review methodASTM E1252General techniques for qualitative infrared spectra
Materials suitable for qualitative infrared analysis
General acquisition practice supporting matched-reference qualitative FTIR comparison. It is not a product-identification method, quantitative assay or pass/fail specification.
Review official scopeASTM D7896Coolants and related fluids
Thermal properties by transient hot wire
Measures thermal conductivity and diffusivity and calculates volumetric heat capacity under declared temperature and method conditions after confirming the sample falls within the published limits.
Review methodASTM D7896Thermal properties by transient hot wire
Coolants and related fluids
Measures thermal conductivity and diffusivity and calculates volumetric heat capacity under declared temperature and method conditions after confirming the sample falls within the published limits.
Review official scopeASTM D8040Heat-transfer fluids and metal coupons
Corrosion procedure based on ASTM D8040
Qualification or investigation using a separately documented procedure based on ASTM D8040 and modified where applicable under OCP guidance. Every coupon and procedure deviation must be declared.
Review methodASTM D8040Corrosion procedure based on ASTM D8040
Heat-transfer fluids and metal coupons
Qualification or investigation using a separately documented procedure based on ASTM D8040 and modified where applicable under OCP guidance. Every coupon and procedure deviation must be declared.
Review official scopeDetailed technical brief
Request the full pg25 coolants test panel.
Tell us the fluid, system and question. We will share the recommended panel and collection brief for your request.
Get the detailed briefReporting output
A report built for the next decision.
Measured result
Method, unit, quality status and sample identity remain clear.
Baseline comparison
Current and previous results are made comparable without changing the raw record.
Human interpretation
A reviewer separates what was measured, what it may mean and what to do next.
Clear handoff
Operators, manufacturers and asset teams receive the same result and context.
PG25 coolants / Asia intake