Freezing and freezing-point measurement service

Freezing and Freezing‑Point Measurement Service – Ensuring Low‑Temperature Performance for Brazilian Products

As an ISO/IEC 17025 accredited independent testing laboratory, we provide accurate freezing point and solidification temperature measurement services for Brazilian producers, importers, and quality assurance teams. Whether you handle diesel fuels, lubricants, industrial chemicals, food concentrates, or antifreeze fluids, our analytical platform determines the exact temperature at which a sample begins to crystallise or becomes immobile under controlled cooling conditions. These critical thermal parameters directly affect product handling, storage stability, pumping capability, and end‑use reliability in Brazil’s diverse climates – from the cold winter of the South to refrigerated storage chains. All methods are aligned with ABNT NBR standards, ANP (National Agency of Petroleum, Natural Gas and Biofuels) specifications, ANVISA (food and pharmaceutical purity requirements), and international norms such as ASTM and ISO, ensuring that your results are defensible, traceable, and accepted by Brazilian regulatory bodies and commercial partners.

Product Samples We Regularly Test for Freezing and Freezing‑Point

Our laboratory handles a wide variety of liquid and semi‑solid materials across multiple industrial sectors. Typical test specimens include:

• Petroleum and fuel products – diesel (S‑10, S‑500), aviation kerosene (QAV‑1), marine fuel oils, gasoline, and automotive gasoline blends
• Lubricants and base oils – engine oils, hydraulic oils, gear oils, turbine oils, and white oils
• Pure chemicals and solvents – benzene, toluene, xylene, styrene, ethyl acetate, methanol, and glycols
• Organic compounds and intermediates – fatty acids, fatty alcohols, waxes, and polymerisation monomers
• Food and beverage products – fruit juice concentrates, sugar syrups, honey, ice‑cream mixes, and edible oils
• Antifreeze and heat‑transfer fluids – ethylene glycol and propylene glycol based coolants, brake fluids, and thermal oils
• Pharmaceutical and cosmetic raw materials – excipients, glycerine, propylene glycol, and emollient esters

Petroleum Products – Cloud Point, Pour Point, Freezing Point and Cold Filter Plugging Point

• Cloud point determination (CP) – We cool the sample at a controlled rate and visually or automatically detect the temperature at which wax crystals first appear, following ASTM D2500 and ISO 3015. This parameter is essential for diesel and heating oils to prevent filter clogging in cold‑weather operations; results are reported in °C with a measurement uncertainty of ±0.5 °C.
• Pour point measurement (PP) – Using the method described in ASTM D97 and ISO 3016, we cool the sample in a water‑bath or air‑bath and check its flowability at intervals of 3 °C. The lowest temperature at which the oil ceases to flow is recorded as the pour point, critical for winter‑grade lubricants and fuel storage tanks in southern Brazil.
• Freezing point of aviation turbine fuels (ASTM D2386) – For jet fuel (QAV‑1 and QAV‑1A), we determine the temperature at which solid hydrocarbon crystals appear under controlled cooling and agitation, per ASTM D2386. The freezing point is typically below ‑40 °C for kerosene‑type fuels; our automated apparatus provides continuous temperature measurement and crystal detection, ensuring compliance with ANP Resolution No. 42/2021 for Brazilian aviation.
• Cold filter plugging point (CFPP) for diesel – We apply ASTM D6371 and ISO 11608 (withdrawal procedure) to measure the temperature at which a cooled diesel sample fails to pass through a standard filter screen within a specified time. This simulates low‑temperature operability in vehicle fuel filters; we report the CFPP value and provide a pass/fail assessment against the required seasonal limit (e.g., ≤ ‑5 °C for summer and ≤ ‑15 °C for winter in Brazilian regions).
• Aniline point and wax appearance temperature (WAT) – optional – For specialty fuels, we also offer differential scanning calorimetry (DSC) to measure the wax appearance temperature, per ASTM D4419, providing a more detailed thermal profile of the fuel’s low‑temperature behavior.

Pure Chemicals and Industrial Solvents – Crystallization Point and Freezing Point Determination

• Crystallization point (ASTM D1015 / D1016) for organic compounds – We determine the equilibrium temperature at which a pure chemical (e.g., benzene, phenol, stearic acid) transitions from liquid to solid, using a precision thermostatic bath and a calibrated platinum resistance thermometer (PRT). The cooling curve is plotted and the plateau temperature is reported as the crystallisation point, with a typical precision of ±0.1 °C. This parameter is critical for purity verification in Brazilian chemical imports and exports.
• Freezing point depression for solvent purity (ASTM D2700 adapted) – For solvents such as toluene, xylene, and ethyl acetate, we measure the freezing point and compare it to the published value for the pure compound. Any depression indicates the presence of impurities; our report includes the observed depression and an estimated purity level based on the cryoscopic constant of the solvent.
• Dynamic viscosity at onset of freezing – During the cooling process, we simultaneously measure viscosity using a rotational viscometer to determine the temperature at which viscosity sharply increases – an indicator of incipient solidification. This is particularly relevant for monomers (e.g., styrene) where freezing may cause polymerisation risk during storage.
• Subcooling and metastable behaviour – We also record the degree of subcooling (the temperature below the true freezing point before crystallisation initiates), as this affects the reliability of storage tank monitoring. The test follows recommendations from ASTM E1142 (thermodynamic definitions) and is reported as a separate indicator.

Food and Beverage Products – Freezing Point Depression and Purity Assessment

• Freezing point of fruit juice concentrates (AOAC 966.06 / Brix‑adjusted) – We measure the freezing point of juice samples (orange, apple, grape, etc.) using a thermistor‑based cryoscope, in accordance with AOAC Official Method 966.06 (for apple juice) and general cryoscopic principles. The freezing point depression is correlated with soluble solids content and can indicate adulteration (e.g., addition of sucrose or water). Our test reports the freezing point in °C (typically between ‑2 °C and ‑7 °C for concentrates) and provides a purity index based on standard Brix‑freezing point tables.
• Milk and dairy products – cryoscopic method for added water detection – Using the same cryoscope, we determine the freezing point of milk, cream, and yogurt as per ISO 5764 (cryoscopic method). The measured freezing point is compared to the normal range for pure milk (approximately ‑0.520 °C to ‑0.550 °C); any increase (less negative) indicates water addition. Our results are used by Brazilian dairy processors to meet MAPA (Ministry of Agriculture) regulations for milk quality.
• Sugar syrups and honey – freezing point to evaluate moisture content – For high‑sugar liquids, we measure the freezing point and apply the relationship between freezing point and water activity. The test is performed according to AOAC 969.38 for honey, with the freezing point reported as an indicator of fermentation risk and storage stability.
• Edible oils – solidification point (cold test) – For oils such as palm oil, soybean oil, and olive oil, we conduct the cold test per ISO 6321 and ABNT NBR 14755. The sample is cooled in a chilled bath and observed for cloudiness or solidification; the temperature at which the oil becomes turbid or fully solid is recorded. This parameter is critical for oil blending and winterisation processes in Brazilian edible oil refineries.

Coolants, Antifreeze and Hydraulic Fluids – Freezing Point and Low‑Temperature Viscosity

• Freezing point of engine coolants (ASTM D1177 and ASTM D6660) – We determine the freezing point of ethylene glycol and propylene glycol based antifreeze solutions, both as‑received and after dilution with water. The test follows ASTM D1177 (manual method) and ASTM D6660 (automated method using differential scanning calorimetry). The results are reported in °C and compared to the manufacturer’s claim; typical freezing points range from ‑20 °C to ‑50 °C depending on concentration.
• Brake fluid low‑temperature fluidity and freezing stability – For DOT 3, DOT 4 and DOT 5 brake fluids, we assess their freezing point and low‑temperature kinematic viscosity per FMVSS 116 and ISO 4925. The sample is cooled to ‑40 °C and observed for any crystallisation or excessive viscosity increase. Our report includes the freezing point (if observed) and the viscosity at ‑40 °C, which is critical for braking performance in cold climates.
• Thermal oils and heat‑transfer fluids – pour point and freezing onset – For synthetic and mineral‑based thermal oils, we measure the pour point (ASTM D97) and, where applicable, the freezing point (ASTM D1793) to ensure that the fluid remains pumpable during start‑up in cold Brazilian seasonal conditions. We also measure the viscosity at low temperatures to confirm suitability for circulating systems.
• Hydraulic fluids (mineral and fire‑resistant) – low‑temperature flowability – We test hydraulic oils according to ISO 12922 (fire‑resistant fluids) and DIN 51524 (mineral oils), measuring the cloud point, pour point, and freezing point to ensure proper operation of mobile and industrial hydraulic systems during winter months or in refrigerated warehouses.

Report Acceptance & Compliance with Brazilian Regulatory Bodies

All freezing and freezing‑point measurements described above are conducted within the scope of our ISO/IEC 17025:2017 accreditation, using calibrated platinum resistance thermometers (traceable to national standards), temperature‑controlled baths verified with reference thermometers, and automated cryoscopes that are regularly checked with certified reference fluids. Our final test reports include a comprehensive description of the test method, cooling rate, sample preparation, and environmental conditions; raw temperature‑time data (or cooling curves); the measured freezing point, cloud point, pour point, or CFPP value with its associated expanded uncertainty (k=2); and a clear conformity statement against your specified limit or reference standard. These reports are widely accepted by ANP for fuel and lubricant quality certification, by ANVISA for food and pharmaceutical purity assurance, by MAPA for dairy and juice product quality, and by INMETRO for legal metrology and product safety assessments. We provide bilingual (Portuguese/English) versions to facilitate submission to Brazilian authorities and internal quality audits, ensuring that your product’s low‑temperature behaviour is documented with the technical rigour, traceability, and clarity that our Brazilian partners rely on for informed decision‑making.