| HS Code | 979313 |
| Polymer Base | Biodegradable PLA blend |
| Form | Pellets |
| Color | Natural |
| Density | 1.25 g/cm³ |
| Melt Flow Rate | 3.0 g/10 min at 190 °C/2.16 kg |
| Melting Point | 150 °C |
| Vicat Softening Temperature | 55 °C |
| Tensile Strength | 25 MPa |
| Elongation At Break | 300% |
| Tensile Modulus | 1500 MPa |
| Shore D Hardness | 60 |
| Biobased Carbon Content | >50% |
| Compostability Certification | EN 13432, ASTM D6400, DIN CERTCO |
| Recommended Processing Temperature | 160-180 °C |
| Recommended Film Thickness | 20-100 µm |
As an accredited Bio-Flex F 6510 Blown Film Biodegradable PLA Blend factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Bio-Flex F 6510 Blown Film Biodegradable PLA Blend supplied in 25 kg moisture-barrier foil-lined paper bags, palletized for industrial shipping. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Bio-Flex F 6510 blown film biodegradable PLA blend, palletized, shrink-wrapped, and secured for ocean freight. |
| Shipping | Bio-Flex F 6510 Blown Film Biodegradable PLA Blend ships as resin pellets in moisture-barrier bags, cartons, or octabins. Transport in clean, dry, ventilated containers at ambient temperature, away from heat, moisture, and sunlight. Typically non-hazardous/not regulated for transport; confirm SDS, labeling, and local rules. |
| Storage | Store Bio-Flex F 6510 Blown Film Biodegradable PLA Blend in a cool, dry, well-ventilated area in sealed original packaging. Protect from moisture, direct sunlight, heat, and ignition sources. Keep away from strong oxidizers, acids, and bases. Avoid prolonged high temperatures to prevent degradation, caking, or property loss. Stack safely, rotate stock, and keep containers closed when not in use. |
| Shelf Life | 12 months when stored in original unopened packaging under dry, cool conditions, away from direct sunlight. |
Mono-layer carrier film conversion from Bio-Flex F 6510 imposes a narrow processing window because the PLA component attenuates into a bubble with lower melt strength than conventional low-density polyethylene. On a 45 mm single-screw blown film line with L/D 30:1 and a barrier screw, stable bubble formation is typically maintained only when the melt temperature at the die lip is held between 155 °C and 170 °C. Excursions above 175 °C reduce melt viscosity non-linearly and produce bubble respiration, die-lip deposit, and gel formation from lactide re-equilibration. Pre-drying in a desiccant dryer at 70–80 °C for 4–6 h to residual moisture below 250 ppm is mandatory because polyester hydrolysis at this moisture threshold causes viscosity loss and film haze. A dryer dew point of ≤ -40 °C is required for batch-to-batch stability. The grade is supplied in the melt-flow class appropriate for blown film and can be processed with melt flow rate characterization under ISO 1133-1:2022 at 190 °C/2.16 kg, though published datasheet values for F 6510 may vary by production lot. Typical carrier bag formulations contain 80–90 wt% virgin F 6510, 10–20 wt% edge-trim regrind, 2–4 wt% synthetic silica antiblock masterbatch, and 0.2–0.5 wt% erucamide slip agent. Slip loadings above 0.5 wt% lower seal strength and can complicate EN 13432 organic constituent accounting unless the masterbatch is independently certified. Blow-up ratio is held at 2.5:1–3.2:1, die gap at 0.8–1.2 mm, and frost line height at 3–6 die diameters. Below 15 µm gauge, the bubble enters a cliff-edge zone where melt fracture and edge-weld splitting increase, especially on rotary bag machines at line speeds above 120 cycles/min. The terminal T-shirt bag is tested under ASTM D882 for tensile properties, ASTM D1709 for dart drop, and ASTM D1922 for Elmendorf tear. At 30 µm, sufficient elongation at break in both machine and transverse directions is required for rotary conversion, but published data for this specific F 6510 configuration is limited; incoming reel lots should therefore be screened with a minimum of 10 samples per reel before full-speed conversion.
Because kitchen caddy liners carry wet, acidic organic refuse, the limiting property is often not tensile strength but the ability of the film to fragment under pilot-scale composting conditions. Bio-Flex F 6510 blown into 25–40 µm organic waste liners is compounded with 2–5 wt% biodegradable pigment masterbatch and 1–2 wt% processing aid, the latter limited to avoid adding unnecessary oxygen-demanding carbon load. In conversion, melt temperature is kept at 160–165 °C, die gap at 0.9–1.1 mm, and blow-up ratio at 2.2:1–2.8:1. The resulting film must provide puncture resistance for typical 3–5 kg organic waste loads, but the specification is anchored to the EN 13432 disintegration endpoint. The material must biodegrade at or above 90 % under ISO 14855-1:2012 within 180 days, disintegrate to no more than 10 % retained on a 2 mm sieve after 12 weeks in ISO 16929:2021, and pass ecotoxicity evaluation under OECD 208. On a production-scale 60 mm blown film line, the principal bottleneck is moisture re-uptake from recycled trim because caddy liner trim is often recovered from humid waste-handling areas. Regrind ratios above 15 wt% without re-drying produce visible gel defects and a measurable decline in dart drop. The film also requires a low blocking tendency so that stacked liners separate during dispenser use; this is achieved with antiblock masterbatch at loadings that do not compromise disintegration. Not all municipal biogas or anaerobic digestion facilities accept EN 13432 film because residence time may be below 30 days and hydrolysis conditions may be insufficient; F 6510 liners should therefore be excluded from anaerobic digestion streams unless the receiving facility has verified disintegration performance.
EN 13432 certification matrix for organic waste liners is summarized as follows:
| Parameter | Standard | Requirement |
|---|---|---|
| Aerobic biodegradation | ISO 14855-1:2012 | ≥ 90 % after 180 days |
| Pilot-scale disintegration | ISO 16929:2021 | ≤ 10 % retained on 2 mm sieve after 12 weeks |
| Ecotoxicity | OECD 208 | No significant germination or growth inhibition |
| Heavy metals | EN 13432 Annex A | Below defined mg/kg dry solids limits |
For annual cropping systems, a buried mulch film must retain mechanical integrity during canopy closure and then embrittle in soil through hydrolysis of the PLA phase. Soil-contact film produced from F 6510 is compounded with 5–8 wt% biodegradable carbon black masterbatch or alternate infrared-reflecting pigment to achieve weed-suppressive opacity. The melt is processed into 12–25 µm film using a die temperature of 150–160 °C, a blow-up ratio of 2.0:1–2.8:1, and a die gap of 0.7–1.0 mm. Because carbon black raises shear heating, screw speeds above 70 min⁻¹ on a 50 mm barrier screw can push melt temperature beyond 170 °C and generate pre-degradation streaks in the film. In loam soil at 60–65 % water holding capacity and 20–25 °C, PLA-phase hydrolysis lowers molecular weight and elongation at break is expected to fall below 50 % of the original value within an estimated 60–100 days, but published data for F 6510 under the complete soil burial matrix specified in EN 17033:2018 is limited. The relevant compliance path is EN 17033:2018 for soil biodegradable mulch film, with soil biodegradation tested under ISO 17556:2019 or ASTM D5988-18, and ecotoxicity tested under OECD 208. The film is not intended for multi-season greenhouse use or for regions where soil temperature remains below 15 °C at planting. It should also not be combined with amine-based fertilizer coatings that accelerate premature hydrolysis of the polyester phase.
Perforated produce bags made from Bio-Flex F 6510 typically run at 15–30 µm and are engineered for high water vapour transmission rather than oxygen exclusion. The PLA blend contributes a water vapour transmission rate higher than that of low-density polyethylene and a moderately low oxygen transmission; for fresh-cut leafy produce, this reduces condensate pooling but may still require mechanical perforation. A typical formulation contains 0.5–1.5 wt% anti-fog masterbatch based on sorbitan ester chemistry. Loadings above 2 wt% cause surface bloom, poor print adhesion, and seal contamination. Corona treatment at 34–38 dyn/cm is applied before flexographic water-based ink printing. Heat seal settings are 90–110 °C jaw temperature, 0.3–0.5 MPa pressure, and 0.5–1.0 s dwell; seal strength is measured by ASTM F88. Water vapour transmission rate is measured by ASTM F1249 at 23 °C/85 % RH; oxygen transmission rate is measured by ASTM D3985 at 23 °C/0 % RH. Supplier datasheets for F 6510 do not provide gauge-normalized WVTR, so film converters qualifying this grade for produce bags usually test each gauge lot. Food contact compliance requires the finished bag to meet overall migration limits of 10 mg/dm² under EU Regulation 10/2011, and US FDA 21 CFR 176.170 may apply depending on food type and temperature. The operational boundary is low-temperature brittleness: produce bags held below 5 °C should be handled without sharp folds, and perforation patterns below 1 mm diameter can tear under fill weights above 2 kg.
Mailer films in the 40–80 µm range demand a tear-propagation balance that pure PLA films cannot meet; converting this grade for e-commerce mailers therefore requires modification with 5–15 wt% PBAT-rich impact modifier and 2–5 wt% antiblock masterbatch. The blown film line is set with a lower blow-up ratio of 2.0:1–2.5:1, a die gap of 1.0–1.5 mm, and a melt temperature of 155–165 °C to maintain orientation and puncture toughness. Elmendorf tear is measured under ASTM D1922, puncture under EN 14477, and seal strength under ASTM F88. Mailer closure requires a destructive seal at 100–120 °C, 0.4–0.6 MPa, and 0.5–1.0 s; film too rich in slip agent or anti-fog will fail below 3 N/15 mm. The terminal mailer must meet EN 13432 as a complete article, including adhesive and label components; any pressure-sensitive adhesive used for closure must be independently certified and must not exceed the organic constituent threshold applicable to packaging components. On commercial 55 mm single-screw lines with 30:1 L/D, the primary failure mode is tear initiation at the die fold, which is mitigated by collapsing-frame angle below 15° and by avoiding film blocking through silica masterbatch at the stated loading. Batch-to-batch variation in PBAT impact modifier changes dart drop coefficient by as much as 15–20 %, so incoming modifier lots should be pre-compounded and measured before line start-up. Published data for F 6510 in mailer configurations is limited but indicates that the grade is suitable only for single-use, non-durable shipping applications; it is not a substitute for cross-laminated tear-resistant polyethylene mailers under repeated abrasion.
Window-patching applications in folded carton board use the blown film as a transparent heat-sealed insert over die-cut windows. The film is processed at 20–30 µm with 1–3 wt% slip/antiblock masterbatch to allow stacking and die-cutting without blocking. Window patch machines run roll-fed film through reciprocating seal heads at 95–115 °C, 0.2–0.4 MPa, and dwell 0.3–0.8 s. Because the film is not in direct microbial contact in dry shelf storage, its compostability claim is linked to EN 13432, but its functional specification is primarily optical: haze below 15 % measured by ASTM D1003, and clarity sufficient to view the packaged product. The film must be antistatic to run at 100–150 cycles/min on window patch lines; static charge above 2 kV causes misfeed. A typical compound contains 97–99 wt% F 6510 and 1–3 wt% antistatic/antiblock masterbatch. The terminal product is a compostable carton window for dry bakery, confectionery, and cosmetic packaging, provided the paperboard and adhesive are also certified. The limitation is that the PLA phase in the film can deform under prolonged warehouse temperatures above 40 °C; cartons should not be stacked with window film under load for more than 6 months unless compression creep has been tested.
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Bio-Flex F 6510 is a biodegradable polylactic acid (PLA) blend formulated for blown film extrusion. The compound combines PLA with a biodegradable copolyester and a processing stabilizer; the supplier’s technical datasheet does not disclose the exact copolyester fraction, but the renewable carbon fraction can be quantified by ASTM D6866-22 or EN 16640 radiocarbon analysis. The grade is used in short-service-life film applications such as organic waste bags, carrier bags, agricultural mulch substitutes, and secondary packaging. Industrial compostability is certified under EN 13432:2000, and the North American specification is ASTM D6400-23. Unlike injection molding PLA grades, Bio-Flex F 6510 is viscosity-modified to maintain bubble stability at low melt temperatures and to support film production on conventional polyethylene blown film lines.
Before film extrusion, pellets are dried in a desiccant dryer at 70°C to 80°C for 4 h to 6 h. Residual moisture must be below 250 ppm (0.025%); higher moisture hydrolyzes the PLA fraction, reducing melt viscosity and producing pinholes. A desiccant unit with a dew point below -40°C is required for continuous operation. Single-screw extruders with L/D ratios of 25:1 to 30:1 and compression ratios of 2.5:1 to 3.0:1 are suitable. Grooved feed sections improve throughput, but excessive shear heating must be avoided; barrel temperatures are typically set between 145°C and 165°C, with adapter and die zones held within 5°C of the last barrel zone.
Incoming pellet evaluation begins with melt flow index determination according to ISO 1133-1:2022 at 190°C/2.16 kg after drying. A shift in melt flow index of more than 15% relative to the approved baseline indicates a lot-to-lot viscosity change that may alter bubble stability, film gauge, or tensile elongation. Intrinsic viscosity in chloroform at 25°C according to DIN EN ISO 1628-1 is measured when melt flow index changes are detected; a reduction in intrinsic viscosity below the supplier limit indicates hydrolytic or thermal degradation during transport or drying. Pellet moisture is determined by Karl Fischer titration or a calibrated moisture analyzer. Film samples are conditioned at 23°C and 50% relative humidity for at least 40 h before mechanical testing according to ISO 291:2021.
The blown film process for this PLA blend is governed by a narrow thermal window. Melt temperature measured at the die is maintained between 150°C and 170°C. Above 180°C, thermal degradation of the PLA segment accelerates, reducing molecular weight and bubble strength; below 145°C, melt pressure rises and surface defects appear. The recommended die gap is 0.8 mm to 1.2 mm, with a blow-up ratio of 2.0:1 to 3.0:1. Frost line height is held between 2 and 4 die diameters. A low frost line increases transverse orientation and impact, while a high frost line increases haze and blocking tendency. The bubble should be supported by an internal bubble cooling system when production speeds exceed 20 m/min; without internal bubble cooling, gauge variation can rise above ±10% at high throughput.
Melt strength is the limiting rheological parameter. The PLA/polyester mixture exhibits shear-thinning behavior, but the shear sensitivity is lower than that of PBAT-rich compounds. Published data for the exact melt flow index of Bio-Flex F 6510 are limited in secondary sources; lot-specific values should be obtained from the supplier’s certificate of analysis, typically measured according to ISO 1133-1:2022 at 190°C/2.16 kg. Field data from blown film lines indicate that bubble instability occurs when melt temperature fluctuates more than ±3°C; die zones must therefore be calibrated and thermocouple placement verified. A breaker plate with screen packs of 60/100/60 mesh removes gel particles; pressure drop across the screen pack should be monitored and screens replaced when the differential exceeds 25% of the initial pressure. Residence time should be kept below 2 min to limit hydrolysis.
The apparent shear rate at the die lip is calculated from output, die circumference, and die gap. For a typical 250 mm die with a 1.0 mm gap, apparent shear rates range from 50 s⁻¹ to 500 s⁻¹ depending on output. In this range, the material may exhibit a power-law index below 0.6, indicating pronounced shear thinning. However, melt strength is extensional rather than shear-dominated; low shear sensitivity does not guarantee stable bubble formation. Gauge uniformity is influenced by die temperature uniformity; a temperature gradient greater than 3°C across the die circumference produces banded thickness variation. Die gaps below 0.6 mm raise melt pressure and accelerate shear heating; die gaps above 1.4 mm reduce molecular orientation and yield films with lower tensile strength.
Compostability claims for Bio-Flex F 6510 are evaluated through the modular requirements of EN 13432:2000. Biodegradation is measured by ISO 14855-1:2021 under controlled aerobic composting conditions; the acceptance threshold is 90% mineralization relative to the positive reference within 180 days. Disintegration is assessed by ISO 16929:2021 in pilot-scale aerobic composting; a compostable film must fragment so that 90% of the initial dry mass passes through a 2 mm sieve after 12 weeks. The standard also imposes heavy metal limits in EN 13432:2000 Annex A.3 and an ecotoxicity test battery on the final compost. For North American supply chains, ASTM D6400-23 provides a parallel specification but does not use an identical home compost segment.
| Standard / method | Scope | Criterion |
|---|---|---|
| EN 13432:2000 clauses 5.1 and 5.2 | Biodegradation, disintegration, ecotoxicity | 90% biodegradation in 180 days; 90% disintegration through 2 mm sieve |
| ISO 14855-1:2021 | Aerobic biodegradation under controlled composting | Ultimate biodegradation relative to reference material |
| ISO 16929:2021 | Pilot-scale disintegration after 12 weeks | No more than 10% residue retained on 2 mm sieve |
| EN 13432:2000 Annex A.3 | Heavy metals and fluorine | Threshold values per standard |
| ASTM D6400-23 | Specification for compostable plastics | Certification by recognized body |
The grade is generally certified for industrial composting; home composting conditions at ambient temperature may not provide the sustained thermophilic phase required for complete mineralization. Published data for this specific configuration are limited when films exceed 50 µm thickness, and certification bodies generally require retesting above that thickness. The presence of PLA raises the glass transition temperature relative to PBAT; however, the compostability mechanism is enzymatic hydrolysis followed by microbial assimilation, not oxidative degradation.
At a nominal thickness of 25 µm, the tensile properties of Bio-Flex F 6510 are evaluated according to ISO 527-3:2018. Machine-direction tensile strength is commonly reported between 35 MPa and 50 MPa, with elongation at break between 200% and 350%. Transverse-direction values are typically 10% to 20% lower due to orientation effects. The higher PLA fraction increases modulus and dead-fold but lowers puncture and tear propagation compared with PBAT-dominant films. Elmendorf tear resistance measured by ISO 6383-2:2018 is the limiting property for light-gauge organic waste bags. Film converters compensate by increasing nominal thickness to 30 µm or 40 µm or by coextruding a PBAT-rich outer layer. Corona treatment is applied after film formation at 38 mN/m to 42 mN/m surface tension for water-based flexographic inks. Sealing is typically performed with heated jaws at 110°C to 130°C; dwell time should be validated on-line because PLA-based films transfer heat more slowly than LDPE.
The compound is sensitive to amine-based additives, which can accelerate transesterification and reduce melt strength. Slip and antiblock additives must be selected from EN 13432:2000-compliant masterbatches; talc-based antiblock can affect haze and tear. Mist lubrication with vegetable-based lubricants is used on some lines to prevent bubble marking, but the lubricant must not contain paraffin oils that migrate and reduce surface tension below 38 mN/m. Colorants should be compostable masterbatches based on polyesters or PLA; PE-based masterbatches are incompatible and create laminar delamination in thin films. Regrind from edge trim can be reintroduced at levels up to 30%, but reground material must be dried and screened because the thermal history increases gel content. Higher regrind levels reduce dart impact and increase blocking.
A transition from PBAT-dominant films to Bio-Flex F 6510 shifts the property profile toward higher stiffness and lower elongation. The modulus of a 25 µm monolayer may be in the range of 1200 MPa to 1800 MPa, whereas many PBAT-rich films are below 200 MPa. This difference improves bag opening and dimensional stability but reduces resistance to sharp organic matter. In use, the film must be specified with a minimum thickness of 25 µm; thinner gauges may exhibit premature puncture when loaded with wet kitchen waste. The thermal service limit is below 55°C, beyond which dimensional change becomes significant. The film is not suitable for hot-fill, microwaving, or direct sunlight storage above that threshold. Print adhesion without corona treatment is insufficient because the PLA surface has a low polar contribution; an in-line corona treater must therefore be installed adjacent to the haul-off.
In agricultural mulch substitutes, the water vapor transmission rate of a 25 µm Bio-Flex F 6510 film is higher than that of LDPE of the same thickness. This allows soil moisture to equilibrate but reduces the weed suppression period. The film must be buried at edges to prevent wind lift; mechanical installation with a plastic mulching machine is possible if the film is 30 µm or thicker. Published data for this specific configuration are limited because field disintegration depends on soil temperature, microbial activity, and ultraviolet exposure. The grade is not ultraviolet-stabilized for multi-season use; disintegration typically begins after one cropping cycle under industrial composting conditions, not in soil at ambient temperature.
Compared with Bio-Flex F 2110, an injection molding grade, Bio-Flex F 6510 has a higher melt strength and a lower melt flow index. This supports bubble stability but makes thin-wall injection molding impractical. The film also differs from cast film PLA grades in that the blown film grade contains a higher molecular weight polyester fraction, which reduces haze but increases extrusion back pressure. In comparison with PBAT-rich blown film compounds, Bio-Flex F 6510 delivers a higher bio-based carbon fraction, but the exact percentage is batch-dependent and should be verified by ASTM D6866-22 or EN 16640. Optical properties are governed by crystallinity and spherulite size. The film is translucent rather than transparent; haze values are typically higher than LLDPE but lower than blown starch-rich films. Gauge uniformity below ±8% is required for acceptable print registration. The grade should not be blended with standard LDPE reclaim or introduced into mixed-polyolefin recycling streams; the density difference and thermal degradation behavior separate it from LDPE and LLDPE in commercial sortation.
