High-density polyethylene particle testing service

High-Density Polyethylene Particle Testing Service for Global Resin and Recycling Compliance

As an ISO/IEC 17025 accredited laboratory, we provide a dedicated high-density polyethylene particle testing service that evaluates resin purity, melt flow consistency, mechanical performance, thermal stability, chemical resistance, and food-contact safety of HDPE granules, pellets, and recycled flakes. Our high-density polyethylene particle testing service supports manufacturers, compounders, recyclers, and exporters who must demonstrate conformity to ASTM, ISO, EN, and regional plastics regulations across the European Union, North America, the Middle East, and Asia. Every test is conducted under our CNAS-accredited quality system, delivering reports accepted by notified bodies, resin suppliers, and procurement teams worldwide.

Product Samples We Regularly Test in Our High-Density Polyethylene Particle Testing Service

Virgin HDPE blow molding and injection molding pellets — for bottles, caps, crates, toys, and industrial containers
HDPE film and pipe extrusion resins — with bimodal or unimodal molecular weight distribution for packaging and pressure pipes
Recycled and post-consumer HDPE flakes and regrind — from milk bottles, detergent containers, and mixed rigid plastics
Color-compounded and additive-modified HDPE masterbatch pellets — with UV stabilizers, antioxidants, slip agents, and nucleating agents
High-molecular-weight HDPE powder and micropellets — for rotational molding, battery separators, and specialty coatings
Off-spec, wide-spec, and reprocessed HDPE particles — for cost-sensitive applications and secondary use qualification
Custom-formulated and bio-based HDPE particle blends — for sustainability programs and carbon footprint reduction

Melt Flow and Processing Characterization for High-Density Polyethylene Particles

Melt mass-flow rate and melt volume-flow rate per ASTM D1238 and ISO 1133 — the melt flow rate of the HDPE particles is measured under standard conditions, providing the primary indicator of molecular weight and processability for injection molding, blow molding, and extrusion operations.
Shear viscosity and flow curve by capillary rheometry per ISO 11443 — the viscosity of the molten HDPE is measured across a range of shear rates, generating the flow curve that predicts pressure drop, die swell, and melt fracture behavior during processing.
Melt density and thermal conductivity per ISO 1183 and ASTM D5930 — the density of the molten polymer and its heat transfer properties are measured to support mold filling simulation and cooling time optimization.
Draw-down and melt strength evaluation per internal protocols — the ability of the HDPE melt to be drawn into thin films or stretched without rupture is assessed, critical for film blowing and extrusion coating applications.
Oxidative induction time and thermal stability under processing conditions per ASTM D3895 — the resistance of the HDPE melt to thermal-oxidative degradation is measured, ensuring the antioxidant package prevents gel formation and color shift during compounding and molding.

Mechanical and Physical Property Testing of Molded HDPE Specimens

Tensile properties per ASTM D638 and ISO 527-2 — molded specimens are pulled to failure to measure yield strength, tensile strength, and elongation at break, verifying the HDPE particles produce parts with the required load-bearing capacity and ductility.
Flexural modulus and flexural strength per ASTM D790 and ISO 178 — three-point bending tests determine the stiffness and bending resistance of the HDPE material, essential for structural containers, pallets, and pipe fittings.
Charpy and Izod impact strength per ISO 179-1, ISO 180, and ASTM D256 — the energy absorbed during fracture is measured at ambient and low temperatures to ensure the resin provides adequate toughness for the intended end use.
Shore D hardness per ASTM D2240 and ISO 48-4 — the surface hardness of molded HDPE plaques is measured to verify resistance to indentation, scratching, and wear in material handling and consumer applications.
Environmental stress crack resistance per ASTM D1693 and ISO 22088 — the susceptibility of the HDPE to slow crack growth in the presence of detergents, oils, and stress-cracking agents is evaluated, a critical durability parameter for bottles, geomembranes, and chemical containers.
Creep and stress relaxation behavior per ASTM D2990 — long-term deformation under constant load is measured to predict the dimensional stability and load retention of HDPE parts over their expected service life.

Thermal Analysis and Heat Resistance Testing for High-Density Polyethylene Particles

Differential scanning calorimetry for melting point and crystallinity per ASTM D3418 and ISO 11357-3 — the melting temperature, crystallization temperature, and percentage crystallinity of the HDPE are measured to verify resin grade and to predict processing and end-use temperature limits.
Thermogravimetric analysis per ASTM E1131 — the mass loss profile quantifies the HDPE content, carbon black, inorganic fillers, and volatile additives, and determines the decomposition onset temperature for thermal stability assessment.
Vicat softening point and heat deflection temperature per ISO 306 and ASTM D648 — the temperature at which the HDPE softens or deflects under load is recorded to establish the maximum continuous service temperature for molded articles.
Long-term thermal aging and retention of mechanical properties per ASTM D3045 — the HDPE is aged in hot air ovens and the retained tensile strength and elongation are measured to predict the thermal endurance and the effect of service temperature on product life.
Thermal cycling and low-temperature brittleness per ASTM D2137 — the HDPE is cycled between hot and cold extremes and tested for brittle fracture at sub-zero temperatures, ensuring reliable performance in cold climates and freezer applications.

Chemical Resistance and Environmental Durability Testing for High-Density Polyethylene Particles

Immersion resistance to acids, alkalis, and organic solvents per ASTM D543 and ISO 175 — the HDPE material is exposed to representative chemicals and the change in mass, dimensions, and mechanical properties is recorded to verify compatibility with the intended chemical environment.
Resistance to fuels, oils, and lubricants per ASTM D471 — the HDPE is tested with hydrocarbons and industrial fluids to ensure no swelling, softening, or environmental stress cracking occurs in contact with automotive and industrial fluids.
Water absorption and moisture resistance per ASTM D570 — the mass of water absorbed after immersion is measured to confirm the HDPE maintains its mechanical properties and dimensional stability in wet and humid service conditions.
UV and xenon-arc accelerated weathering per ASTM G155 and ISO 4892-2 — the HDPE is exposed to simulated sunlight and moisture cycles, and the color change, surface cracking, and retained mechanical properties are evaluated to predict outdoor service life.
Ozone resistance per ISO 1431-1 — the HDPE is exposed to ozone under strain and inspected for surface cracking, ensuring long-term durability in polluted urban and industrial atmospheres.
Resistance to mold and fungal growth per ASTM G21 and ISO 846 — the HDPE is inoculated with fungal spores and incubated to confirm it does not support biological growth in damp and soil-contact environments.

Chemical Safety and Regulatory Compliance for High-Density Polyethylene Particles

RoHS compliance per IEC 62321 and EU Directive 2011/65/EU — quantitative screening for lead, mercury, cadmium, hexavalent chromium, PBBs, and PBDEs in the HDPE resin and additives to ensure the particles meet global substance restrictions.
REACH Annex XVII and SVHC screening — targeted analysis of Substances of Very High Concern including phthalate plasticizers, organotin stabilizers, and short-chain chlorinated paraffins that may be present in the HDPE formulation.
Overall migration and specific migration for food contact per EU Regulation 10/2011 and FDA 21 CFR — the HDPE particles are tested with food simulants under the intended use conditions to confirm that no harmful substances migrate into food above the regulatory limits, supporting food-grade certification for packaging and kitchenware.
Heavy metals and extractable elements per EN 71-3 and ASTM F963 — for HDPE used in toys and children's products, the migration of antimony, arsenic, barium, cadmium, chromium, lead, mercury, and selenium is tested to verify user safety.
Formaldehyde and volatile organic compound emissions per ISO 16000-3 — chamber emission testing verifies that the HDPE particles do not release harmful VOCs or formaldehyde into the indoor air during storage, processing, or end use.
Polycyclic aromatic hydrocarbons per AfPS GS 2019:01 PAK — for carbon-black-filled or dark-colored HDPE particles, the 15 restricted PAHs are extracted and quantified to confirm compliance with European product safety limits.
Halogen content by combustion ion chromatography per EN 14582 — the total fluorine, chlorine, bromine, and iodine content is measured to support halogen-free declarations and to verify compatibility with recycling and disposal regulations.
Heavy metals in packaging per EU Directive 94/62/EC — verification that the sum concentration of lead, cadmium, mercury, and hexavalent chromium in the packaging materials and labels is below the 100 ppm regulatory limit.

Report Recognition and ISO/IEC 17025 Compliance

All test methods described in this high-density polyethylene particle testing service are covered by our ISO/IEC 17025 scope of accreditation. Our technical reports and certificates of analysis are accepted by European notified bodies for plastics and construction products, by North American resin suppliers and packaging OEMs referencing ASTM and FDA standards, and by customs and procurement authorities across the Middle East, Australia, and Asia. Whether you require a complete qualification dossier for a new HDPE resin grade, a batch release inspection for an export shipment, or a root cause failure analysis of a processing or performance issue, our laboratory provides the measurement accuracy and polymer science expertise that the global polyethylene industry demands.