| HS Code | 720898 |
| Chemical Composition | Polylactic acid (PLA) |
| Bio Based Carbon Content | ~100% |
| Density | 1.24 g/cm³ |
| Melt Flow Rate | 8 g/10 min (210°C/2.16 kg) |
| Glass Transition Temperature | 55-60°C |
| Melting Temperature | 165-175°C |
| Tensile Strength | 70 MPa |
| Tensile Modulus | 3.5 GPa |
| Elongation At Break | 2.5% |
| Flexural Strength | 100 MPa |
| Flexural Modulus | 3.5 GPa |
| Notched Izod Impact Strength | 2.5 kJ/m² |
| Heat Deflection Temperature | 120°C at 0.455 MPa |
| Vicat Softening Temperature | 60°C |
| Processing Melt Temperature | 190-220°C |
| Mold Temperature | 25-55°C |
| Drying Temperature | 80°C |
As an accredited Ingeo Polylactic Acid (PLA) 6752D factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Ingeo Polylactic Acid (PLA) 6752D is supplied in 25 kg moisture-resistant paper bags, palletized and shrink-wrapped for transport. |
| Container Loading (20′ FCL) | Non-hazardous Ingeo PLA 6752D loaded in 20′ FCL: 25 kg bags on pallets, shrink-wrapped, evenly distributed, secured for ocean freight. |
| Shipping | Ingeo Polylactic Acid (PLA) 6752D is typically shipped as non-hazardous, moisture-sensitive polymer pellets in lined bags, boxes, or bulk containers. It is generally not regulated by DOT, IMDG, or IATA. Store cool and dry, avoid excessive heat or moisture, keep containers sealed, and follow the SDS. Handle per supplier instructions. |
| Storage | Store Ingeo PLA 6752D in a cool, dry, well-ventilated area in tightly sealed original packaging. Keep below 50°C, away from direct sunlight, heat, moisture, and ignition sources. Avoid prolonged exposure to humid air, as moisture can degrade the resin during processing. Use oldest stock first and reseal opened containers. Store separately from incompatible chemicals. Maintain clean, dry handling conditions. |
| Shelf Life | Ingeo PLA 6752D shelf life: typically 24 months stored unopened in original packaging, cool, dry, away from moisture and heat. |
Sheet extrusion of Ingeo PLA 6752D for thermoformed food packaging is specified around a residual moisture ceiling of 250 ppm, a desiccant dryer set point of 80°C for 4 h, and a dew point no higher than -40°C; any excursion above 300 ppm before the extruder throat typically drops melt strength by hydrolytic chain scission and appears as edge curl, uneven die flow, or thermoforming web sag. Regulatory compliance for food contact is governed by EU Commission Regulation (EU) No 10/2011 and US FDA FCN 000178, while industrial compostability claims on the finished article follow EN 13432:2000 or ASTM D6400-19 only when the total package, including label and adhesive, meets the disintegration and ecotoxicity clauses. Formulation for clear rigid sheet runs neat at 0.5–2.0 wt% slip/antiblock masterbatch; impact-modified deli and takeaway containers are compounded with 5–15 wt% core-shell impact modifier, 0.2–1.0 wt% nucleating agent, and 0.1–0.3 wt% chain extender to preserve melt strength. The downstream process is a single-screw extruder with 30:1 L/D barrier screw, melt pump, screen pack mesh 60/100/60, melt temperature 190–210°C, die temperature 195–200°C, three-roll stack at 25–40°C, and sheet thickness 0.3–1.2 mm; thermoforming follows at preheat 90–120°C, plug-assist speed and mold temperature 30–50°C adjusted to keep sidewall thinning above 70% of nominal sheet gauge. Terminal article types include hinged clamshells, produce trays, bakery domes, deli cups, lids, and portion packs; the dominant field failure is not tensile yield but corner stress whitening and hinge fatigue, both of which are controlled by plug temperature, impact-modifier loading, and residual moisture rather than by barrel set point alone.
Extrusion coating of paperboard with 6752D is run at coating weights of 15–35 g/m²; below 15 g/m² pinhole frequency increases, while above 35 g/m² chill-roll release becomes inconsistent and edge curl rises. Food-contact compliance for single-use paper cups and cartons is evaluated under EU Commission Regulation (EU) No 10/2011 overall migration limits and US FDA FCN 000178; biobased carbon content on the coated board can be reported through ASTM D6866-22, but the result is a mass-balance property of the coating layer only. Additive loading in the coating layer is typically 500–2,000 ppm active antiblock, 300–1,500 ppm slip, and 4–10 wt% pigment or TiO2 masterbatch; when heat-seal initiation temperature must be reduced for frozen food cartons, a 10–25 wt% amorphous PLA copolymer blend is used, but this sacrifices melt strength and must be balanced with die-lip deposit control. The downstream line uses a single-screw extruder with 24:1–30:1 L/D, melt temperature 195–230°C, flat die gap 0.6–0.8 mm, air gap 150–250 mm, and a matte or gloss chill roll at 15–25°C; corona treatment to 40–44 mN/m surface energy is required for lamination, and line speeds are held between 120 m/min and 250 m/min because lower speed raises coating oxidation and higher speed destabilizes the melt curtain. End products include hot-beverage cup stock, cold-beverage cups, folding cartons, frozen food board, and molded fiber lamination for foodservice clamshells; the critical field defect is delamination at the paper/PLA interface under freezer-moisture cycling, which is mitigated more by board surface roughness and corona wetting than by coating weight alone.
In biaxially oriented PLA film conversion, 6752D is cast onto a chill roll at 15–25°C to suppress spherulitic haze, then stretched sequentially at 65–75°C in machine direction and 70–85°C in transverse direction; draw ratios of 2.5–4.0 MD and 3.5–5.0 TD are typical before annealing at 120–140°C with 2–8% relaxation. Transverse-direction yield stress depressions are observed when annealing exceeds 130°C and transverse draw exceeds 4.5 without adequate relaxation, so the production window is deliberately restricted. Film-layer formulation uses active slip at 300–1,500 ppm, antiblock at 500–3,000 ppm, and nucleating masterbatch at 0.3–1.0 wt%; a heat-seal layer, where required, is typically a 2–5 wt% low-melting PLA copolymer blend that lowers seal initiation temperature but reduces film stiffness. Tensile properties are tested per ASTM D882-18 and ISO 527-3, oxygen transmission per ASTM D3985-17, and water vapor transmission per ASTM F1249-20; food-contact end use remains under EU Commission Regulation (EU) No 10/2011 and US FDA FCN 000178. Downstream equipment includes a sequential tenter frame with clip speed differential, infrared and hot-air oven zones set to ±2°C, and online thickness mapping. Published converter data for 6752D-specific biaxial orientation remain limited; the process limits cited here are therefore taken from PLA films of the same optical-grade additive class and should be validated on the target tenter. Final article types are wrap labels, shrink sleeves, twist wrap for confectionery, flow-wrap windows, and box windows.
| Conversion route | Compliance/test standard | Formulation window | Process boundary |
|---|---|---|---|
| Sheet/thermoforming | EU (EU) No 10/2011, FDA FCN 000178, ASTM D6400-19 | Impact modifier 5–15 wt%, nucleator 0.2–1.0 wt% | Moisture <250 ppm, melt 190–210°C, preheat 90–120°C |
| Extrusion coating | EU (EU) No 10/2011, FDA FCN 000178, ASTM D6866-22 | Antiblock 500–2,000 ppm, pigment 4–10 wt% | Coating weight 15–35 g/m², chill roll 15–25°C |
| Biaxially oriented film | ASTM D882-18, ASTM D3985-17, ASTM F1249-20 | Antiblock 500–3,000 ppm, nucleator 0.3–1.0 wt% | MD draw 2.5–4.0, TD draw 3.5–5.0, anneal 120–140°C |
| Injection molding | ASTM D638-14, ISO 527-2, ASTM D648-18 | Nucleator 0.5–2.0 wt%, mold release 0.1–0.4 wt% | Mold 25–40°C amorphous / 80–100°C crystalline |
| Spunbond nonwoven | ISO 9073-1:1989, EN ISO 10993-5:2009 | TiO2 3–8 wt%, melt stabilizer 0.2–0.5 wt% | Calender 125–135°C, throughput stable below 0.4 g/hole/min |
| FFF filament | ASTM D638-14, RoHS 2011/65/EU | Nucleator 0.5–1.5 wt%, color 2–4 wt% | Filament ovality ±0.05 mm at 60 m/min |
Injection molding of 6752D-derived rigid serviceware requires a desiccant drying profile of 80°C for 4–6 h to <250 ppm moisture; a hopper and throat kept below -40°C dew point prevents hydrolytic molecular-weight loss during barrel residence. The regulatory envelope is EU Commission Regulation (EU) No 10/2011 and US FDA FCN 000178 for food-contact cutlery and containers, while mechanical acceptance follows ASTM D638-14, ISO 527-2, ASTM D790-17, ASTM D256-23, and ASTM D648-18 for tensile, flexural, Izod, and heat deflection measurements. Formulation for opaque high-heat cutlery uses nucleating agent at 0.5–2.0 wt% talc or 0.1–0.5 wt% poly(D-lactide) stereocomplex, mold release at 0.1–0.4 wt%, impact modifier at 5–10 wt% for hinge ductility, and chain extender at 0.1–0.3 wt% to offset shear-induced degradation. The downstream press is configured with barrel zones 165–200°C, nozzle 195–200°C, screw back pressure 5–12 bar, injection speed 60–150 mm/s, hold pressure 40–80 MPa, and clamp force of 800–1,500 kN per cavity depending on multicavity stack tooling. For transparent amorphous articles the mold temperature is held at 25–40°C; for hot-fill or dishwasher-tolerant items the tool is run at 80–100°C or a post-mold crystallization stage at 80–100°C for 30–60 s is required. Finished part types include disposable cutlery, thin-wall portion containers, hangers, caps, and cosmetic jars; the main operational boundary is that amorphous parts soften above roughly 55–60°C, so hot-fill or microwaving claims require crystallized morphology and are not achieved by barrel temperature adjustment alone.
Spunbond conversion of PLA 6752D in hygiene and agricultural nonwovens is operated with extruder zones 200–235°C, melt pump pressure 30–70 bar, spinneret hole diameter 0.35–0.60 mm, quench air 15–20°C, and a bonding calender at 125–135°C with nip pressure 40–80 N/mm; throughput above 0.4 g/hole/min becomes unstable when pellet moisture exceeds 250 ppm, causing spinneret drool and filament breaks. Compliance for hygiene nonwovens is anchored to ISO 9073-1:1989 for mass per unit area, ISO 9073-2:1995 for thickness, EN ISO 10993-5:2009 for cytocompatibility where medical disposable use is claimed, and ASTM D6400-19 or EN 13432:2000 only when the unfinished fabric is certified for industrial compostability. The formulation uses TiO2 masterbatch at 3–8 wt% to control opacity and UV sensitivity, melt stabilizer at 0.2–0.5 wt% to reduce molecular-weight loss during high-temperature spinning, and antistatic masterbatch at 0.1–0.4 wt%; softness modification for crop cover and wipe applications is achieved with 10–20 wt% poly(butylene succinate) or poly(butylene adipate-co-terephthalate) blend, which reduces calender bonding temperature but also lowers thermal stability. The downstream process includes monofilament attenuation by a draw jet, a moving collection belt at 150–400 m/min, and thermal bonding through an engraved roll set to a temperature within 5°C of the PLA melting onset; terminal fabric types include hygiene topsheet and backsheet, medical barrier wrap, wet wipes, agricultural crop covers, and tea bag material.
Fused filament fabrication feedstock produced from 6752D is extruded on a single-screw 24:1 line with barrel profile 170–190°C, water bath 35–50°C, and closed-loop dual-axis laser gauging; ovality above ±0.05 mm at haul-off speeds above 60 m/min is commonly traced to melt-temperature oscillation of only ±2°C or to filtration coarser than 100 µm, not to the resin grade itself. Compliance for the finished filament is under REACH and RoHS 2011/65/EU for substance restrictions, while printed solid specimens are tested according to ASTM D638-14 and ISO 527-2:2012; food-contact claims for printed articles are not automatic and require migration testing under EU Commission Regulation (EU) No 10/2011 because pigments and processing aids change the skin-layer composition. The formulated compound includes nucleating agent at 0.5–1.5 wt%, color masterbatch at 2–4 wt%, and chain extender at 0.1–0.3 wt%; impact modifier is omitted when printed parts require tensile modulus above 3.0 GPa. The downstream process relies on melt filtration of 80–100 µm, a pressure transducer upstream of the die, and a multi-axis gauging loop that compares diameter to the 1.75 mm or 2.85 mm target at a sampling frequency sufficient to correct line speed without producing diameter oscillations. End products are spooled monofilament in 1.75 mm and 2.85 mm formats, custom-colored PLA filament, and structural support or interface filament for fused-filament fabrication; the limiting field failure is filament brittleness after uncontrolled post-extrusion crystallization, which is prevented by water-bath quenching below 50°C and by avoiding spool storage above 40°C.
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Ingeo Polylactic Acid (PLA) 6752D is a commercial biopolymer resin supplied by NatureWorks for biaxially oriented film and transparent packaging applications. The grade is differentiated from fast-crystallizing injection-molding PLAs by a controlled D-lactide content and a molecular weight distribution selected for stable tentering at elevated draw ratios. The melt flow rate is 4.0 g/10 min at 210 °C under 2.16 kg when measured to ASTM D1238, and the specific gravity is 1.24 per ASTM D792. These values are typical material-characterization values, not batch specification limits, and converters use them to qualify incoming resin and to compare the grade with general-purpose 2003D or high-flow 3052D PLAs. The 6752D designation is not interchangeable with those grades in sizing and process-setpoint calculations because melt viscosity, quiescent crystallization rate, and orientation-induced crystallization respond differently to the same extruder profile.
Incoming resin qualification for 6752D typically includes melt flow rate, moisture, and visual pellet contamination. Because the grade is produced by ring-opening polymerization of lactide, residual lactide can be present at low parts-per-million levels; this residual monomer influences melt viscosity and odour in cast film. Batch-to-batch variance in D-lactide content within the specification range can shift the cold-crystallization onset by several degrees Celsius. Statistical process control of these variables is recommended for BOPLA lines because a change in D-lactide content of only 0.5 mol % can alter the transverse stretching window and heat-set response. Published data for the exact specification range of 6752D is limited, but resin certificates of analysis provide the values needed for process tracking.
Thermal analysis of neat pellet stock by differential scanning calorimetry at 10 °C/min heating rate typically reports a glass transition near 57 °C and a melting endotherm near 155 °C. These thermal markers are used to set chill-roll temperatures, machine-direction preheat zones, transverse stretching temperatures, and heat-set conditions. Rapid quenching from the melt is required because high quiescent crystallinity in the cast sheet can produce transverse stretching defects and gauge bands. If the sheet is held between 90 °C and 120 °C for extended periods, cold-crystallization increases haze and reduces the usable stretch window. Published data for 6752D-specific isothermal crystallization half-times in the orientation temperature range is limited, but the grade is generally described as slower-crystallizing than nucleated injection-molding PLA grades, which favors tenter stretching but reduces the dimensional stability of unstretched sheet.
Compared with Ingeo 2003D, a general-purpose extrusion and thermoforming PLA typically characterized by a melt flow rate near 6.0 g/10 min under 210 °C/2.16 kg per ASTM D1238, 6752D has a lower flow index and greater melt strength. In production, that difference appears as lower sag in cast-sheet reheat processes and better web stability when the sheet is gripped at the tenter frame. Screw torque and melt pressure are higher for 6752D on the same extruder. A 65 mm single-screw extruder with 30:1 L/D and a barrier screw may require a 10–15 % reduction in screw speed when switching from 2003D to 6752D at the same melt temperature and die gap. This viscosity difference reduces the risk of edge tear during transverse stretching but makes purging and start-up slower. The two grades share similar tensile strength in injection-molded specimens, but the oriented film response differs because the higher molecular weight of 6752D delays stress relaxation during stretching.
Pre-drying is mandatory for 6752D when pellets have been exposed to ambient humidity above 60 % RH for more than 48 h. Desiccant drying at 80 °C for 4 h with air dew point below -40 °C is typically specified to reach residual moisture below 250 ppm by ASTM D6980. Hydrolysis in the extruder reduces molecular weight, increases in-process melt flow rate, lowers film tear resistance, and deposits lactide on die surfaces. A moisture excursion above 300 ppm is often observed as a steady melt-pressure reduction at constant screw speed rather than as a pellet appearance change. Because 6752D is used for orientation-sensitive film, the practical tolerance for moisture variation is narrower than for thick sheet or injection-molded parts. If the dryer bed is heavily loaded or the return-air dew point exceeds -20 °C, drying time must be extended beyond the nominal 4 h; moisture analyser calibration under ASTM D6980 should be verified against a known 250 ppm standard.
A 65 mm single-screw extruder with a barrier screw and a compression ratio of 2.5:1 to 3.0:1 is commonly used for PLA film grades. Because 6752D has a lower melt flow rate than general-purpose PLA, viscous dissipation can raise melt temperature even when barrel setpoints are moderate. Screen packs of 100/120/100 mesh are often installed to remove gels, but frequent screen changes may be required if the resin is stored improperly. Venting is not a substitute for drying; atmospheric venting removes little water from PLA melt and can introduce pressure fluctuations. A vacuum vent is used only with a dried feed stream and a stable hopper level, and the vacuum level is typically controlled below -0.08 MPa gauge to avoid pulling melt into the vent port.
Melt processing of 6752D is generally conducted with barrel temperatures from 160 °C near the feed throat to 195 °C in the metering section, with adapter and die temperatures between 190 °C and 210 °C. Residence time above 230 °C should be kept below approximately 10 min to limit lactide reformation and yellowing. Cast sheet for later orientation is usually quenched on chill rolls maintained between 20 °C and 35 °C to suppress quiescent crystallization. Sequential orientation is then performed at 65–75 °C in the machine direction and 70–80 °C in the transverse direction. Typical draw ratios for BOPLA film are 3.5 × 3.5 to 4.0 × 4.0; the exact ratio depends on sheet thickness, orientation line speed, and heat-set conditions. Heat-setting at 130–140 °C under restraint improves dimensional stability above the glass transition but reduces elongation at break and increases stiffness. If the transverse stretch temperature falls below 65 °C, edge-tear and uneven necking become more frequent; if it exceeds 80 °C, the film can lose orientation-induced modulus.
The tensile yield strength of injection-molded 6752D test bars is generally reported near 48 MPa under ASTM D638, with elongation at break below 5 %. Flexural modulus is near 3.5 GPa under ASTM D790, and notched Izod impact is near 0.16 J/cm under ASTM D256. These values are typical and not specification limits; lot-to-lot variation can occur because D-lactide content and molecular weight distribution are controlled within defined ranges rather than at a single point. For oriented film, tensile strength and elongation are highly dependent on draw ratio and heat-set temperature; direct comparison with injection-molded specimens is not appropriate. A BOPLA film can show machine-direction elongation at break below 30 % and transverse-direction elongation below 40 % after heat-setting, but these numbers shift with orientation and annealing history.
Surface treatment of 6752D film is typically performed in-line after tenter orientation. The target wetting tension of 38–42 mN/m is measured under ASTM D2578. Untreated PLA film may have a surface energy that is sufficient for lamination but insufficient for water-based flexographic inks on high-speed presses. The treatment window is narrow because over-treatment can produce surface oxidation and increase retained solvent or odour. Corona discharge electrodes should be cleaned frequently to prevent backside treatment streaks. If metallization is specified, the film must exhibit low heat-seal additive bloom and high surface smoothness; a roughness increase from agglomerated antiblock can degrade metal adhesion.
Heat-seal initiation temperature for 6752D-based films depends on surface crystallinity and heat-set history. In practice, seal initiation can occur between 90 °C and 110 °C on fin-seal profiles, but hot-tack strength is lower than polyethylene and requires dwell-time adjustment. Because the film is biaxially oriented, the sealing jaw must not exceed the thermal shrinkage onset unless the package design tolerates dimensional change. Ultrasonic and impulse sealing are preferred where contact-time control is limited. Published data for 6752D-specific hot-tack curves is limited; package validation under ASTM F88 or ASTM F1921 is required for retort or high-moisture applications.
Commercial conversion of 6752D is directed toward transparent labels, twist film, lamination webs, print film, and overwrap where high stiffness, deadfold, and renewable carbon content are valued. After biaxial orientation, film produced from 6752D can exhibit tensile modulus above 2.5 GPa in the machine direction when measured under ASTM D882, with haze below 2 % on optimized cast/tenter lines. These values are not batch guarantees; they depend on orientation ratio, heat-set temperature, and dryer consistency. The water-vapour transmission rate of oriented PLA is higher than that of high-density polyethylene or polyvinylidene chloride, so high-moisture shelf-stable food packages frequently require a barrier coating, metallization, or lamination. Oxygen transmission at dry conditions is reported as intermediate between oriented PET and oriented polypropylene in the literature, but published data for 6752D-specific film under high-humidity conditions is limited.
Compared with biaxially oriented PET, 6752D has a lower density of 1.24 g/cm³ versus approximately 1.38 g/cm³ for PET, reducing mass per square metre at equivalent gauge. Orientation temperatures are lower than those required for PET, but the thermal resistance of the final film is also lower. Unrestrained 6752D film can distort near the PLA glass transition unless the film is heat-set or coated. Compared with oriented polypropylene, 6752D provides higher tensile modulus and deadfold, but it has higher melt-phase moisture sensitivity and lower elongation at break in the machine direction. Corona treatment is commonly specified at 38–42 mN/m wetting tension to obtain acceptable ink adhesion on flexographic and gravure lines; aging and slip additives can cause decay in wettability and should be validated before long-run production. The lower melting point of 6752D relative to PET also means that thermal lamination settings must be retuned to avoid film shrinkage or surface damage.
Capillary rheometry data for this specific 6752D grade is limited in public sources, but the melt is expected to be pseudoplastic across typical film-extrusion shear rates of 100–1000 s-1. Increasing melt temperature from 190 °C to 210 °C lowers melt viscosity and extruder torque but narrows the reheat orientation temperature window because a hotter, lower-viscosity sheet can self-heat differently during machine-direction stretching. The grade is not developed for high-stalk blown-film bubble stability; attempts to run 6752D on blown-film lines without a high-melt-stability additive can produce bubble instability and gauge variation. In such processes, dedicated blown-film PLA grades or blend systems are preferred. Melt-strength additives can increase extensional viscosity, but they may also raise haze and reduce tensile modulus if used above the supplier’s recommended loading.
Compared with Ingeo 4043D, a cast-film grade that generally has a higher melt flow rate, 6752D is selected when a converter needs greater melt strength for reheat-and-tenter BOPLA lines. A cast-film line running 4043D may reach higher throughput at lower screw torque, but the same resin can show gauge nonuniformity when stretched at 4.0 × 4.0 on a tenter. The higher molecular weight of 6752D reduces neck-in and edge-tear sensitivity during the transverse draw. Conversely, 6752D is not designed for high-speed cast-film lines that demand rapid melt flow and thin edge pinning; in that equipment, melt pressure can exceed the die rating if screw speed is increased to match 4043D output. Processors should therefore select the grade based on the orientation process rather than on dry tensile properties alone. Published comparisons of film-grade PLA are available from resin suppliers, but published data for specific 6752D line trials under different tenter conditions is limited.
Additive and masterbatch compatibility for 6752D must be evaluated in melt-flow stability tests because residual acidity or moisture in colorants, fillers, or biodegradable impact modifiers can accelerate hydrolysis. Amine-based additives that generate free basicity or acidity should be avoided until a short-dwell extrusion trial confirms that melt flow rate drift remains below 0.5 g/10 min after 10 min at 200 °C. Slip and antiblock concentrates based on erucamide or silica can reduce coefficient of friction and film blocking, but they may increase haze and affect corona efficiency. Masterbatch carriers should be PLA-compatible; polyester carriers with high moisture content can introduce excess water and cause splay in the cast sheet. Additive-induced depression of the glass transition or acceleration of cold-crystallization should be confirmed by differential scanning calorimetry before production.
Food-contact suitability for Ingeo PLA grades is generally supported under FDA 21 CFR 177.1460 and the relevant European Union plastics regulation. Converters remain responsible for end-use migration testing under EU 10/2011 or regional legislation because the final film may include coatings, inks, and adhesives that change the overall compliance profile. The following checklist identifies the major standard designations relevant to commercial use of 6752D:
| Regulatory / Standard Domain | Designation | Application in 6752D Qualification |
|---|---|---|
| US food contact | FDA 21 CFR 177.1460 | Clearance for ester polymers in food-contact articles |
| EU plastics migration | EU 10/2011 | Overall migration and specific migration test matrix |
| Biobased carbon | ASTM D6866 | Renewable carbon content verification |
| Density method | ASTM D792 | Material specification and yield calculations |
| Melt flow rate | ASTM D1238 | Incoming resin and post-drying viscosity control |
| Film seal strength | ASTM F88 | Heat-seal package validation |
Storage of 6752D pellets should avoid direct sunlight and temperatures above 40 °C to preserve pellet surface quality. The resin is not recommended for hot-fill packaging above 60 °C unless the film is crystallized, heat-set, or blended with higher-temperature modifiers. Unlike high-density polyethylene or polypropylene, PLA undergoes hydrolytic degradation if wet pellets are processed; therefore, dryer alarms and hopper level controls are critical process instrumentation. The 6752D grade also is not recommended for direct-contact applications involving high-water-activity foods at elevated temperature without barrier protection because PLA is susceptible to hydrolytic attack and loss of molecular weight over time.
