Testing Methods for Recycled Plastics
Expert-defined terms from the Advanced Skill Certificate in Recycled Plastics for Automotive Sector course at London School of Planning and Management. Free to read, free to share, paired with a professional course.
Accelerated Weathering Test (AWT) – a laboratory method that simulates lo… #
Related terms: UV exposure, weathering chambers. The test follows ASTM D 570 or ISO 4892‑2, measuring changes in tensile strength, color shift, and surface cracking. Practical application: evaluating exterior automotive components such as bumper trims for durability. Challenge: reproducing realistic outdoor conditions while keeping test duration reasonable; accelerated cycles may over‑estimate degradation for certain polymer blends.
ASTM D 570 – Water Absorption Test – determines the rate and extent of mo… #
Related terms: hydrolysis, dimensional stability. Specimens are weighed before and after immersion at specified temperatures (often 23 °C and 70 °C) to calculate percent gain. Used to screen recycled polypropylene (rPP) destined for under‑the‑hood ducts where water ingress could affect performance. Challenge: ensuring consistent specimen thickness; high filler content in recycled blends can cause uneven absorption.
ASTM D 638 – Tensile Test – the standard method for measuring tensile str… #
Related terms: dog‑bone specimen, stress‑strain curve. For recycled plastics, the test helps compare the mechanical integrity of reprocessed material against virgin baseline. Example: rPET used in interior panels is tested at 5 mm/min to verify compliance with automotive interior specifications. Challenge: recycled polymers often exhibit higher variability in molecular weight, leading to broader data spread.
ASTM D 790 – Flexural Test – evaluates the flexural modulus and strength… #
Related terms: modulus of rupture, support span. The test is critical for recycled polycarbonate (rPC) components such as instrument panel brackets where bending loads dominate. Results guide design thickness and reinforcement needs. Challenge: ensuring proper specimen alignment; recycled materials with high filler content may cause premature edge failures.
ASTM D 256 – Izod Impact Test – measures the energy absorbed by a notched… #
Related terms: notch sensitivity, impact resistance. Provides a quick screening of impact toughness for recycled acrylonitrile‑butadiene‑styrene (rABS) used in crash‑energy‑absorbing parts. Example: a specimen fractured at 12 J indicates acceptable performance for door interior panels. Challenge: notch placement reproducibility and the influence of residual stresses from re‑extrusion.
ASTM D 1238 – Melt Flow Index (MFI) Test – quantifies the flow rate of a… #
Related terms: MVR (Melt Volume Rate), viscosity. MFI values help assess processability of recycled plastics for injection molding automotive parts. Example: rPP with an MFI of 15 g/10 min is suitable for high‑speed molding of seat frames. Challenge: recycled blends often display non‑Newtonian behavior; MFI alone may not predict extrusion performance accurately.
ASTM D 3418 – Melt Flow Rate (MVR) Test – measures the volume of polymer… #
Related terms: shear thinning, processing window. Used for recycled nylon (rPA) where precise melt behavior is crucial for fuel‑system components. Example: an MVR of 20 cm³/10 min correlates with stable extrusion. Challenge: temperature control is critical; recycled polymers may have residual moisture that skews results.
ASTM D 4338 – Melt Flow Rate of Recycled Plastics – a specialized procedu… #
Related terms: contamination index, regrind. The method modifies standard MFI testing by pre‑conditioning specimens to remove moisture and volatile additives. Practical use: qualifying rHDPE for under‑body splash shields. Challenge: determining the appropriate conditioning time for heterogeneous feedstocks.
ASTM D 5768 – Melt Flow Index of Recycled Thermoplastics – focuses on the… #
Related terms: chain scission, molecular weight distribution. The test tracks MFI changes after each extrusion pass, highlighting degradation trends. Example: rPP shows a 30 % increase in MFI after three reprocessing cycles, indicating reduced molecular weight. Challenge: balancing the need for multiple cycles to achieve homogeneity against the loss of mechanical properties.
ASTM D 638 – Specimen Conditioning – a prerequisite step ensuring specime… #
Related terms: standard atmosphere, 23 °C/50 % RH. Proper conditioning reduces variability in tensile results for recycled polymers, which are more hygroscopic than virgin grades. Challenge: time‑consuming; large batches of regrind may require weeks to equilibrate.
ASTM D 792 – Density and Specific Gravity – determines the bulk density o… #
Related terms: Archimedes principle, void fraction. Recycled plastics often contain trapped air or contaminants that lower apparent density. Example: rLDPE with a measured density of 0.915 g/cm³ is suitable for lightweight interior trims. Challenge: achieving accurate measurements when the material contains heterogeneous fillers.
ASTM D 256 – Notched Izod Impact – a variation of the Izod test that uses… #
Related terms: fracture toughness, KIC. Critical for assessing the impact resistance of recycled glass‑filled polypropylene used in crash‑zone components. Example: a notched impact energy of 8 J indicates sufficient toughness for safety standards. Challenge: notch preparation must be consistent; recycled composites may produce irregular notch surfaces.
ASTM D 4065 – Heat Deflection Temperature (HDT) Test – measures the tempe… #
Related terms: thermal softening, load bearing capacity. HDT is essential for recycled plastics used in engine bay components where temperatures can exceed 120 °C. Example: rPA6 with an HDT of 135 °C meets the requirement for fuel line fittings. Challenge: fillers and residual stresses from reprocessing can cause premature softening, leading to lower HDT values.
ASTM D 3029 – Melt Flow Index of Recycled Polyolefins – adapts the standa… #
Related terms: regrind screening, purity level. The method includes a filtration step to remove large particles before testing. Practical use: qualifying rPE for under‑body shield manufacturing. Challenge: defining acceptable contaminant size limits that still allow reliable MFI measurement.
ASTM D 785 – Gel Permeation Chromatography (GPC) for Molecular Weight – c… #
Related terms: Mn, Mw, polydispersity index (PDI). GPC data reveal the extent of chain scission after multiple reprocessing cycles. Example: rPET with a PDI of 2.5 indicates broader distribution than virgin PET (PDI ≈ 1.8). Challenge: selecting appropriate solvents for mixed‑polymer streams and calibrating the system for recycled material.
ASTM D 412 – Tensile Test of Elastomers – evaluates the tensile propertie… #
Related terms: elastic modulus, elongation at break. The test helps ensure that recycled elastomers retain sufficient stretchability for dynamic applications. Example: a recycled TPU specimen shows a tensile strength of 25 MPa, meeting the design requirement. Challenge: elastomers are highly sensitive to thermal history, and reprocessing may cause cross‑linking or degradation that skews results.
ASTM D 533 – Melt Flow Index of Recycled Polystyrene – a specialized prot… #
Related terms: volatile content, off‑gassing. The test includes a pre‑heating step to drive off volatiles before measuring flow. Example: rPS with an MFI of 5 g/10 min after degassing is suitable for interior panel molding. Challenge: controlling the degassing temperature to avoid further polymer degradation.
ASTM D 638 – Fatigue Testing – a cyclic loading method that quantifies th… #
Related terms: S‑N curve, failure cycles. Important for components such as recycled plastic clips that experience millions of opening‑closing cycles. Example: rPP exhibits an endurance limit of 15 MPa at 10⁶ cycles. Challenge: accelerated fatigue testing may not fully replicate the complex loading spectra encountered in automotive service.
ASTM D 6866 – Radiocarbon Content Test – determines the biobased content… #
Related terms: bio‑based fraction, carbon‑14. Although primarily used for sustainability labeling, the test can verify the proportion of recycled material in a blend. Example: a rPP sample shows 0 % radiocarbon, confirming it is fully fossil‑based. Challenge: cost and sample preparation time limit routine use in automotive quality labs.
ASTM D 7028 – Accelerated Aging of Recycled Plastics – combines thermal,… #
Related terms: oxidative induction time, color retention. The method is used to predict the durability of recycled interior trim exposed to UV light and cabin heat. Example: after 500 h of aging, rPP retains 85 % of its original tensile strength. Challenge: correlating accelerated test data with real‑world performance, especially for mixed‑polymer streams.
ASTM D 7575 – Rheological Characterization of Recycled Plastics – employs… #
Related terms: storage modulus (G’), loss modulus (G’’). Rheology informs extrusion and injection molding parameters for recycled blends. Example: rPA6 shows a 20 % increase in shear viscosity after five reprocessing cycles, indicating higher melt resistance. Challenge: complex filler interactions can produce non‑linear rheological responses that are difficult to model.
ASTM D 792 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET)</b… #
Related terms: thermal degradation, intrinsic viscosity (IV). The test helps determine whether rPET can be used for under‑the‑hood components that require high temperature resistance. Example: rPET with an MFI of 2 g/10 min and IV of 0.70 dL/g meets the required melt flow for injection molding. Challenge: PET is prone to hydrolytic degradation; moisture must be removed before testing to avoid erroneous MFI spikes.
ASTM D 1002 – Peel Test – measures the force required to separate two bon… #
Related terms: adhesive bond strength, substrate surface energy. The test is critical for recycled plastic panels that are assembled with structural adhesives. Example: a recycled PP panel bonded with a polyurethane adhesive shows a peel strength of 1.2 N/mm, meeting the automotive specification. Challenge: surface contamination from regrind can reduce adhesion, requiring additional cleaning steps.
ASTM D 1248 – Thermal Conductivity Test – determines the ability of a rec… #
Related terms: steady‑state method, thermal diffusivity. Example: rHDPE exhibits a thermal conductivity of 0.45 W/m·K, acceptable for splash guard design. Challenge: incorporating fillers such as glass fiber can raise conductivity, potentially exceeding design limits.
ASTM D 1515 – Melt Flow Index of Recycled Polyvinyl Chloride (rPVC) – spe… #
Related terms: plasticizer migration, chlorine content. The test assesses processability for recycled interior trim that must meet flame‑retardant criteria. Example: rPVC with an MFI of 8 g/10 min passes the molding window for door panels. Challenge: residual plasticizers may volatilize during testing, affecting flow measurements.
ASTM D 1601 – Flame Resistance Test (UL 94) – classifies the flammability… #
Related terms: V‑0, V‑1, V‑2 ratings, self‑extinguishing. Critical for interior components where fire safety is mandated. Example: a recycled polycarbonate (rPC) sample achieves a V‑0 rating after adding a halogen‑free flame retardant. Challenge: flame retardant additives can alter mechanical properties and processing behavior, requiring balanced formulation.
ASTM D 1621 – Compression Set Test – evaluates the permanent deformation… #
Related terms: elastic recovery, set percentage. Important for recycled elastomeric seals used in engine compartments. Example: a recycled silicone seal shows a compression set of 10 % after 70 °C for 24 h, within the acceptable range. Challenge: recycled elastomers may contain cross‑linked fragments that reduce recovery, necessitating blend optimization.
ASTM D 1735 – Differential Scanning Calorimetry (DSC) – measures melting… #
Related terms: heat flow, enthalpy of fusion. DSC helps predict processing windows and mechanical performance. Example: rPP exhibits a Tm of 165 °C and a crystallinity of 55 %, indicating good stiffness for automotive brackets. Challenge: mixed polymer streams can produce overlapping thermal events, complicating interpretation.
ASTM D 1765 – Fourier Transform Infrared Spectroscopy (FTIR) – identifies… #
Related terms: spectral peaks, chemical fingerprint. FTIR is used to verify that a recycled blend does not contain prohibited additives. Example: an FTIR spectrum of rPA6 shows characteristic amide peaks at 1650 cm⁻¹ and 1540 cm⁻¹, confirming material identity. Challenge: low‑concentration contaminants may be masked by dominant polymer peaks, requiring advanced baseline correction.
ASTM D 1775 – Thermogravimetric Analysis (TGA) – records weight loss as a… #
Related terms: decomposition temperature, residue. TGA helps assess whether a recycled polymer can withstand automotive under‑hood temperatures. Example: rPET shows a 5 % weight loss at 350 °C, indicating suitable thermal stability. Challenge: moisture and volatile additives can cause early weight loss, leading to misinterpretation of degradation onset.
ASTM D 1822 – Notched Tensile Test – combines tensile loading with a pre‑… #
Related terms: stress concentration factor, fracture toughness. Used for glass‑filled rPP used in crash‑energy‑absorbing structures. Example: a notched tensile strength of 30 MPa meets the design target. Challenge: notch machining on recycled material may cause fiber pull‑out, affecting repeatability.
ASTM D 1975 – Melt Flow Index of Recycled Polyamide (rPA) – specifies hig… #
Related terms: hydrolysis resistance, moisture conditioning. The test informs extrusion parameters for fuel‑system components. Example: rPA6 with an MFI of 12 g/10 min after drying at 80 °C for 4 h is suitable for injection molding. Challenge: incomplete drying leads to hydrolytic degradation during testing, artificially inflating MFI.
ASTM D 2079 – Shear Strength Test – measures the shear resistance of a po… #
Related terms: shear plane, fastener torque. Example: a recycled PP–glass composite shows a shear strength of 18 MPa, sufficient for screw‑type fasteners in interior modules. Challenge: anisotropic filler orientation in recycled composites can cause directional shear strength variations.
ASTM D 2240 – Shore Hardness Test – determines the surface hardness of pl… #
Related terms: penetration depth, elastic recovery. Hardness correlates with wear resistance for recycled polymeric components such as dashboard trims. Example: rABS exhibits a Shore D hardness of 70, meeting the abrasion requirement. Challenge: surface roughness from regrind can affect indenter contact, leading to inconsistent readings.
ASTM D 2369 – Melt Flow Rate of Recycled Polyethylene (rPE) – adapts MFI… #
Related terms: temperature stability, polymer branching. The test guides extrusion speed for recycled PE used in under‑body shields. Example: rPE with an MFI of 10 g/10 min processes well in high‑speed lines. Challenge: residual catalysts from previous processing may cause catalyst‑induced degradation during the test.
ASTM D 2584 – Density Determination of Recycled Plastics Using Helium Pycnome… #
Related terms: pycnometer, skeletal volume. Example: a recycled polypropylene foam shows a closed‑cell density of 0.85 g/cm³, suitable for lightweight interior panels. Challenge: entrapped gases in foamed recycled material can cause measurement errors; degassing is required.
ASTM D 2592 – Color Fastness to Light – evaluates the resistance of recyc… #
Related terms: ΔE value, UV stabilizers. Critical for interior components where aesthetic appearance must be retained. Example: rPP with UV absorbers shows a ΔE of 2 after 500 h exposure, within acceptable limits. Challenge: recycled streams may contain pigments that unevenly absorb UV, leading to localized fading.
ASTM D 263 – Flame Retardancy Test (Horizontal Burn) – measures the burni… #
Related terms: burn length, ignition time. Used for recycled plastics in interior trim that must meet automotive fire safety standards. Example: a recycled ABS sample with a flame retardant additive burns less than 30 mm, passing the test. Challenge: flame retardants can migrate over time, reducing long‑term effectiveness.
ASTM D 2979 – Compression Molding of Recycled Plastics – outlines procedu… #
Related terms: cure cycle, mold release. The method is applied to produce test bars from rPA6 for impact testing. Example: compression‑molded rPA6 yields a tensile strength of 45 MPa. Challenge: achieving uniform density in recycled batches can be difficult due to variable filler content.
ASTM D 3079 – Creep Test – measures time‑dependent deformation under cons… #
Related terms: viscoelastic creep, steady‑state strain. Important for recycled polymeric fasteners that experience sustained loads. Example: a recycled nylon rod shows 0.5 % creep strain after 100 h at 80 °C under 10 MPa. Challenge: long test durations; accelerated creep protocols must be calibrated to avoid over‑prediction.
ASTM D 3165 – Dynamic Mechanical Analysis (DMA) – assesses storage modulu… #
Related terms: frequency sweep, glass transition. DMA helps predict vibration damping performance of recycled TPU used in engine mounts. Example: rTPU exhibits a tan δ peak at 45 °C, indicating effective damping in the expected service range. Challenge: sample preparation for heterogeneous recycled blends can lead to inconsistent results.
ASTM D 3199 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) w… #
Related terms: additive interaction, flow behavior. The test guides processing of rPET blended with impact modifiers for interior panels. Example: after adding 5 wt % impact modifier, the MFI rises to 3 g/10 min, still within processing limits. Challenge: additive dispersion must be uniform; poor mixing can cause localized flow anomalies.
ASTM D 3268 – Melt Flow Index of Recycled Polypropylene (rPP) with Reinforcem… #
Related terms: fiber orientation, anisotropic flow. Example: rPP reinforced with 20 % glass fiber shows an MFI of 4 g/10 min after alignment, indicating manageable viscosity for injection molding. Challenge: achieving consistent fiber orientation across specimens; variability can lead to misleading MFI values.
ASTM D 3330 – Tensile Impact Test (Charpy) – measures the energy absorbed… #
Related terms: impact energy, fracture surface. Used for recycled polycarbonate (rPC) in headlamp housings where impact resistance is critical. Example: rPC records an impact energy of 15 kJ/m², meeting the automotive requirement. Challenge: notch preparation on recycled material may cause fiber pull‑out, reducing repeatability.
ASTM D 3418 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) –… #
16 kg for PET. Related terms: intrinsic viscosity, thermal degradation. The test helps determine whether rPET can be processed in high‑temperature injection molding. Example: rPET exhibits an MFI of 1.5 g/10 min, indicating low flow suitable for thin‑wall parts. Challenge: moisture must be removed; residual water can cause hydrolytic scission, inflating MFI.
ASTM D 3515 – Melt Flow Index of Recycled Polycarbonate (rPC) – uses a te… #
16 kg load. Related terms: glass transition temperature, optical clarity. The method assesses processability for recycled PC used in transparent headlamp lenses. Example: rPC shows an MFI of 0.8 g/10 min, indicating high viscosity suitable for thin‑wall molding. Challenge: high processing temperature can exacerbate discoloration if contaminants are present.
ASTM D 3635 – Melt Flow Index of Recycled Polyamide (rPA) with Moisture Condi… #
Related terms: hydrolytic stability, drying protocol. Example: rPA6 after conditioning displays an MFI of 9 g/10 min, within the target range for extrusion. Challenge: inadequate drying leads to moisture‑induced degradation during the test, producing artificially high MFI values.
ASTM D 3765 – Melt Flow Index of Recycled Polyethylene (rPE) with Additives</… #
Related terms: additive compatibility, flow modification. Example: rPE containing 0.5 % antioxidant shows an MFI of 12 g/10 min, indicating stable processing. Challenge: pigments can cause nozzle blockage during testing, requiring filtration.
ASTM D 3845 – Melt Flow Index of Recycled Elastomers (rTPU) – uses a lowe… #
16 kg) and temperature (190 °C) to accommodate elastomeric melt behavior. Related terms: elastic recovery, shear thinning. Example: rTPU records an MFI of 25 g/10 min, suitable for high‑speed injection molding of vibration dampers. Challenge: elastomers are sensitive to shear heating; excessive test time may cause premature cross‑linking.
ASTM D 3900 – Melt Flow Index of Recycled Polypropylene (rPP) with Regrind Co… #
Related terms: regrind ratio, blending uniformity. Example: a 30 % regrind blend shows an MFI of 8 g/10 min, acceptable for automotive interior parts. Challenge: regrind heterogeneity can cause localized flow variations, affecting mold filling.
ASTM D 3958 – Melt Flow Index of Recycled Polyvinyl Acetate (rPVA) – spec… #
16 kg. Related terms: adhesive compatibility, plasticizer content. Example: rPVA exhibits an MFI of 6 g/10 min, indicating good flow for adhesive‑liner applications. Challenge: high plasticizer migration during testing can alter melt viscosity, leading to inconsistent results.
ASTM D 4025 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) w… #
Related terms: fiber‑matrix interaction, anisotropic flow. Example: rPET‑glass composite shows an MFI of 2 g/10 min after alignment, suitable for injection molding of structural parts. Challenge: fiber breakage during extrusion can affect flow and mechanical properties, requiring careful process control.
ASTM D 4106 – Melt Flow Index of Recycled Polycarbonate (rPC) with UV Stabili… #
Related terms: photostability, additive loading. Example: rPC containing 2 % UV stabilizer records an MFI of 0.9 g/10 min, indicating minimal impact on flow. Challenge: stabilizer agglomeration can cause nozzle clogging during testing.
ASTM D 4145 – Melt Flow Index of Recycled Polyethylene (rPE) with Recycled Co… #
Related terms: recycled content verification, contaminant threshold. Example: a 75 % rPE blend shows an MFI of 11 g/10 min, meeting the processing requirement for under‑body shields. Challenge: high recycled content often brings increased impurity levels, demanding rigorous screening before testing.
ASTM D 4244 – Melt Flow Index of Recycled Polypropylene (rPP) with Nucleating… #
Related terms: crystallization rate, flow modification. Example: rPP with 0.2 % nucleating agent shows an MFI of 7 g/10 min, slightly lower than the base material, indicating increased viscosity due to faster crystallization. Challenge: nucleating agents can cause uneven crystal growth, influencing both flow and final part properties.
ASTM D 4322 – Melt Flow Index of Recycled Polyamide (rPA) with Reinforcement<… #
Related terms: fiber alignment, anisotropic viscosity. Example: rPA6‑glass composite yields an MFI of 5 g/10 min after alignment, suitable for extrusion of high‑strength fuel lines. Challenge: maintaining uniform fiber orientation throughout the melt is difficult, leading to variability in MFI measurements.
ASTM D 4485 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) w… #
Related terms: multicomponent formulation, synergistic effects. Example: rPET containing 3 % impact modifier and 0.5 % UV stabilizer records an MFI of 2.2 g/10 min, within acceptable limits for thin‑wall injection molding. Challenge: interactions among additives can cause unexpected viscosity spikes, requiring iterative formulation.
ASTM D 4520 – Melt Flow Index of Recycled Polypropylene (rPP) with Regrind an… #
Related terms: contaminant removal, purity assessment. Example: after filtration, a rPP batch shows an MFI of 9 g/10 min, confirming suitability for high‑speed molding. Challenge: some contaminants (e.g., metal particles) may not be captured by filtration and can still affect melt flow.
ASTM D 4605 – Melt Flow Index of Recycled Polyethylene (rPE) with Moisture Co… #
Related terms: hydrolytic degradation, drying efficiency. Example: rPE measured after drying displays an MFI of 13 g/10 min, whereas the same sample tested wet shows an MFI of 18 g/10 min, illustrating the impact of moisture. Challenge: ensuring complete moisture removal from high‑filler recycled streams can be time‑consuming.
ASTM D 4720 – Melt Flow Index of Recycled Polyamide (rPA) after Multiple Repr… #
Related terms: chain scission, process history. Example: rPA6 shows an MFI increase from 8 g/10 min (first pass) to 14 g/10 min (fifth pass), indicating molecular weight reduction. Challenge: balancing the need for material homogeneity with the loss of mechanical performance after repeated recycling.
ASTM D 4799 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) w… #
Related terms: regrind loading, flow consistency. Example: rPET with 60 % regrind yields an MFI of 1.8 g/10 min, suitable for injection molding of fuel‑system components. Challenge: regrind particles can cause nozzle blockage, requiring filtration or melt cleaning prior to testing.
ASTM D 4842 – Melt Flow Index of Recycled Polycarbonate (rPC) with Flame Reta… #
Related terms: flame retardant loading, viscosity increase. Example: rPC containing 5 % flame retardant shows an MFI of 0.7 g/10 min, slightly lower than the base material, indicating higher viscosity. Challenge: flame retardant particles may agglomerate, causing non‑uniform flow and affecting molding consistency.
ASTM D 4925 – Melt Flow Index of Recycled Polypropylene (rPP) with Color Pigm… #
Related terms: pigment dispersion, color stability. Example: rPP colored with 3 % black pigment records an MFI of 8 g/10 min, comparable to the unpigmented material, confirming good dispersion. Challenge: poor pigment distribution can lead to localized viscosity spikes, resulting in uneven filling of molds.
ASTM D 5002 – Melt Flow Index of Recycled Polyethylene (rPE) with Impact Modi… #
Related terms: toughening agents, melt viscosity. Example: rPE with 4 % impact modifier shows an MFI of 9 g/10 min, a slight reduction from the base 11 g/10 min, indicating acceptable processability. Challenge: impact modifiers may degrade at high extrusion temperatures, necessitating careful temperature control.
ASTM D 5085 – Melt Flow Index of Recycled Polyamide (rPA) with Fiber Reinforc… #
Related terms: fiber orientation, anisotropic flow. Example: rPA6‑glass composite shows an MFI of 6 g/10 min after alignment, suitable for extrusion of reinforced fuel lines. Challenge: achieving repeatable fiber alignment in the test apparatus is difficult, leading to variability in results.
ASTM D 5120 – Melt Flow Index of Recycled Polyethylene Terephthalate (rPET) w… #
Related terms: additive leaching, viscosity change. Example: rPET containing a migratory plasticizer shows an initial MFI of 2 g/10 min, which rises to