| HS Code | 798915 |
| Material Type | Linear Low Density Polyethylene (LLDPE) |
| Co Monomer | Hexene |
| Density | 0.921 g/cm³ |
| Melt Index 190 C 2 16 Kg | 0.80 g/10 min |
| Processing Method | Blown film extrusion |
| Md Tensile Strength At Break | 52 MPa |
| Td Tensile Strength At Break | 45 MPa |
| Md Elongation At Break | 360% |
| Td Elongation At Break | 650% |
| Dart Drop Impact F50 1 Mil | 800 g |
| Md Elmendorf Tear Strength | 350 g |
| Td Elmendorf Tear Strength | 650 g |
| Haze | 12% |
| Gloss 45 | 55 |
As an accredited NOVAPOL LLDPE PF-Y821-CP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVAPOL LLDPE PF-Y821-CP is supplied as 25 kg polyethylene-lined kraft bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of NOVAPOL LLDPE PF-Y821-CP in heat-sealed bags on pallets, securely braced for safe transit. |
| Shipping | NOVAPOL LLDPE PF-Y821-CP is a linear low-density polyethylene resin, supplied as free-flowing pellets. It ships as non-hazardous cargo in lined bulk railcars, hopper trucks, or 25-kg bags. Protect from moisture, dust, and excessive heat during transport. Keep packaging intact and store in a clean, dry area. |
| Storage | Store NOVAPOL LLDPE PF-Y821-CP in a clean, dry, well-ventilated area away from direct sunlight, heat sources, and ignition. Keep original containers closed and protected from moisture, dust, and contamination. Maintain moderate ambient temperatures below 50°C. Avoid stacking excessively or damaging bags. Resin is non-hazardous, but good housekeeping prevents slip hazards. |
| Shelf Life | Shelf life is indefinite when stored in original packaging away from heat, moisture, and direct sunlight. |
In coextruded machine stretch-film production, NOVAPOL PF-Y821-CP is processed as the core-layer linear low-density polyethylene in pallet-wrap structures ranging from 12 µm to 30 µm total thickness. The grade is characterized by a density of 0.921 g/cm³ and a melt index of 2.0 g/10 min measured under ASTM D1238 at 190 °C/2.16 kg. Formulation addition is typically 70 wt% to 90 wt% of the total LLDPE fraction in the core layer of A/B/A or A/B/C structures, with the remainder allocated to higher-alpha-olefin LLDPE or metallocene PE grades selected to shift machine-direction recovery and puncture resistance. For pallet-wrap products, compliance testing is conducted under ASTM D5458 for peel cling, ASTM D5459 for machine-direction elastic recovery and stress retention, and ASTM D5748 for protrusion puncture resistance. Ultimate elongation is verified under ISO 527-3; converters typically specify machine-direction elongation above 400% at 23 µm when the web is compounded without abrasive reclaim or oxidized regrind. The downstream process uses a cast-film line with a single-screw extruder configured at 30:1 to 33:1 L/D, a barrier screw with dispersive mixing elements, die temperatures between 240 °C and 260 °C, and chill roll surface temperatures controlled between 15 °C and 25 °C. Edge pinning, vacuum box extraction, and secondary chill rolls are set to control web neck-in and maintain transverse thickness variation below ±5%. Under ASTM D5459, machine-direction elastic recovery at 200% elongation is typically specified by converters at values above 80%; actual values shift with cling-tackifier concentration and chill roll cooling rate. Terminal finished-product types include machine-grade stretch film for rotary ring and turntable wrappers, pre-stretched hand wrap on 50 mm cores, and coreless stretch rolls. Published data for high-output lines exceeding 600 m/min with this specific grade is limited; production-scale trials should compare melt-pressure stability and gel counts when blending with post-industrial reclaim because recovery under ASTM D5459 may shift by more than 5 percentage points at reclaim levels above 15 wt%.
The sealing window of cast lidding film based on NOVAPOL PF-Y821-CP is controlled by seal-bar temperature, dwell time, and web thickness profile rather than by sealant resin melt index alone. In direct food-contact structures, the resin is used at 100 wt% for monolayer lidding or at 85 wt% to 95 wt% of the sealant layer in coextruded and extrusion-laminated structures. Compliance for finished lidding under 21 CFR 177.1520(c) requires that the olefin polymer contains only permitted adjuvants, while EU Regulation (EC) No 10/2011 requires overall migration testing under EN 1186 with 10 mg/dm² as the limit for general food contact. Specific migration limits for additives supplied in masterbatch form must be checked against the Union List in Annex I of EU 10/2011 before commercial release. The downstream process is cast-film extrusion, lamination coating, or coextrusion lamination onto oriented polyester, biaxially oriented polypropylene, or aluminium foil, with melt temperatures between 230 °C and 260 °C and chill roll temperatures below 25 °C to prevent odour-generating oxidation and heat-seal distortion. Ultrasonic sealing integrity is verified under ASTM F88; production-scale data show that film-thickness variation above ±5% lowers ultrasonic weld strength by more than 10% because energy directors do not engage uniformly across the seal area. Terminal finished-product types include lidding for dairy cups, snack pouches, fresh-cut produce trays, and single-serve condiment containers. This grade is not pre-dried under normal warehouse conditions, but surface condensation at relative humidity above 70% should be removed by hopper air at 60 °C to 80 °C to prevent cast-web splay and bubble defects. Reclaim from food-contact cast film may be reused in food-contact layers only when the source stream is controlled and documented under 21 CFR 177.1520(c); non-food reclaim supplied from external post-industrial sources must not be used in the sealant layer because identity and migration history cannot be established under EN 1186 testing requirements.
Stretch hood film is extruded on five-layer cast coextrusion lines where NOVAPOL PF-Y821-CP is added at 80 wt% to 100 wt% of the core polyethylene fraction in 60 µm to 120 µm webs used for pallet containment. Compliance for industrial non-food load containment is evaluated under REACH (EC) No 1907/2006 Article 33 for substances of very high concern, and mechanical verification follows ISO 527-3 for tensile properties and ASTM D5748 for protrusion puncture resistance. The production process uses a cast-film die with automatic thickness control, an air knife for chill roll adhesion, and secondary cooling rolls maintained between 15 °C and 25 °C; melt temperatures at the die are controlled from 240 °C to 260 °C. Stretch hood applicators then draw the film over palletized loads at 50% to 80% pre-elongation, which requires consistent machine-direction elastic recovery and minimal transverse gauge-dependent stress concentration. Terminal finished-product types are stretch hoods for cement bags, white goods, beverage pallets, and construction materials. Published data for PF-Y821-CP in hood film containing recycled polyethylene content is limited; adding more than 15 wt% post-consumer recyclate without static mixing has been associated with gels and unstable gauge bands on 2,000 mm wide dies in production-scale cast lines.
In baled forage wrapping, NOVAPOL PF-Y821-CP is blended as the LLDPE carrier resin in cast coextruded silage films with total thickness from 20 µm to 30 µm. The formulation addition ratio is typically 75 wt% to 90 wt% of the polyethylene phase, while polyisobutylene or specialty cling masterbatch accounts for 1 wt% to 4 wt% and carbon black or UV stabilizer masterbatch accounts for 3 wt% to 6 wt% when full outdoor storage beyond 12 months is specified. Compliance is assessed under EN 14932 for thermoplastic stretch films used for wrapping silage bales, with additional tensile and puncture verification under ISO 527-3 and ASTM D5748; films intended for direct contact with animal feed should be evaluated under applicable national feed-contact rules and Regulation (EC) No 1935/2004 where notified-body documentation is required. The downstream process is cast-film coextrusion with a die gap of 0.5 mm to 0.7 mm, melt temperatures of 230 °C to 260 °C, and chill roll temperatures below 30 °C; pre-stretch units on wrapping machines apply 55% to 70% elongation during application, and 6 to 8 film layers are wrapped around round bales. Terminal finished-product types include round-bale silage wrap, high-oxygen-barrier coextruded silage film, and square-bale stretch wrap. Published data for PF-Y821-CP in oxygen-barrier coextrusions with PA or EVOH is limited; adhesion between tie-layer and PF-Y821-CP should be checked under ASTM F88 or equivalent peel seal methods because delamination at pre-stretch elongation above 60% has been observed in production scale when layer adhesion is below 2.0 N/15 mm.
Surface protection webs produced on cast lines use NOVAPOL PF-Y821-CP at 70 wt% to 100 wt% of the backing layer in coextruded structures where a polyolefin adhesive layer is skin-laminated onto stainless steel, coated aluminium, injection-moulded ABS or PMMA housings, or glass. Compliance for electronic and appliance protection is tested against RoHS Directive 2011/65/EU Annex II restricted-substance limits and REACH (EC) No 1907/2006; mechanical properties of the carrier film are measured under ISO 527-3 and ASTM D882, while peel adhesion after 24 h dwell on stainless steel is tested under ASTM D3330. The downstream process is cast multi-layer coextrusion with die temperatures between 230 °C and 260 °C, an embossed chill roll at 15 °C to 25 °C for controlled matte finish, and corona discharge treatment to reach wetting tension above 38 mN/m on the adhesive layer. Terminal finished-product types include laser-cut metal sheet protection film, thermoformed appliance panel film, glass-transit protection film, and clean-room protective sheeting. Published data for PF-Y821-CP in this specific configuration is limited; formulators should conduct 72 h dwell peel tests on stainless steel, and should not blend propylene-rich reclaim above 5 wt% into the backing layer without verifying Elmendorf tear resistance under ISO 6383-2 and dart impact resistance under ISO 7765-1.
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NOVAPOL LLDPE PF-Y821-CP is an ethylene-alpha-olefin linear low-density polyethylene specified for cast film extrusion. The nominal melt flow rate is 2.0 g/10 min when measured at 190 °C under a 2.16 kg load using ASTM D1238, and the nominal density is 0.918 g/cm³ when measured using ASTM D1505. The grade is positioned between lower-melt-index blown-film LLDPE resins and higher-melt-index extrusion-coating resins; this viscosity range is selected to limit melt-curtain sag while maintaining sufficient draw for thin-gauge cast film.
The product is used in cast stretch film, high-clarity overwrap, and multi-layer cast film structures where the outer layer requires controlled cling and the core layer requires puncture resistance. On production lines equipped with 75–90 mm extruders, 30:1 L/D barrier screws, and coat-hanger dies from 1800 mm to 2600 mm width, PF-Y821-CP is typically run at film thicknesses from 10 µm to 35 µm. The resin is also evaluated in blends with metallocene LLDPE at 10–30 wt% LLDPE to adjust elongation and tack, but blend viscosity mismatch must be checked because a difference in melt flow rate above 1.0 g/10 min can induce layer non-uniformity in coextruded structures.
| Property | Test method | Nominal value |
|---|---|---|
| Melt flow rate | ASTM D1238 (190 °C/2.16 kg) | 2.0 g/10 min |
| Density | ASTM D1505 | 0.918 g/cm³ |
| Peak melting temperature | ASTM D3418 | 121 °C |
| Vicat softening temperature | ASTM D1525, 10 N load | 98 °C |
| Ash content | ASTM D5630 | <0.05 wt% |
The table values are nominal supplier-reported data rather than batch-release limits. A production site should request the certificate of analysis and record the melt flow rate against a control band of ±0.2 g/10 min; excursions beyond this band alter die pressure, curtain geometry, and final film gauge. The same applies to density control: a shift of 0.005 g/cm³ changes the crystalline fraction sufficiently to move the seal initiation temperature and the secant modulus of the film.
In comparison with LDPE of 0.923 g/cm³ density, PF-Y821-CP at 0.918 g/cm³ retains a lower crystallinity and therefore a lower equilibrium modulus. This translates into lower tensile stiffness and greater low-temperature flexibility. The lower density also shifts the peak melting point downward, which can reduce seal initiation temperature; however, the actual heat-seal response must be measured on the finished film using ASTM F1921 because the sealant layer formulation, gauge, and corona treatment alter surface melting.
Against a general-purpose LLDPE cast film grade of the same nominal melt index, PF-Y821-CP is distinguishable by the manufacturer’s lot-release protocol for cast-film appearance, including gel level and pellet flow consistency. The exact gel level specification is available only from the supplier’s certificate of analysis; published generic data for this product is limited. Processors characterize gel defects on 25 µm film by visual inspection under transmitted light and report gel particle size distribution in classes below 200 µm, between 200 µm and 400 µm, and above 400 µm.
In blown film grades of similar density, the higher melt strength required for bubble stability is often achieved through broader molecular weight distribution or long-chain branching. PF-Y821-CP is not designed for tubular film bubble dynamics; using it on a blown-film line may produce bubble instability and poor frost-line control. Conversely, replacing PF-Y821-CP with a conventional blown-film resin on a cast line can shift neck-in and melt curtain sag because the melt viscosity and extensional behavior differ even when the melt index is identical.
On cast-film lines, the observed relationship between die exit temperature and melt curtain sag is nonlinear. A die exit temperature spread of 5 °C across the width is sufficient to produce edge thinning and uneven chill-roll contact at 10–15 µm gauge. Air-knife velocity and die-to-chill-roll distance become the first corrective variables; increasing air-knife differential pressure above 0.40 MPa can cause melt curtain flutter, while a gap above 30 mm permits excessive neck-in. These processing limits are material-independent but become more noticeable with LLDPE because the melt strength is lower than that of LDPE.
A typical starting profile for cast-film conversion with PF-Y821-CP on a 75 mm, 30:1 L/D extruder is a barrel temperature ramp from 225 °C at the feed zone to 255 °C at the metering zone. The adapter and die are held at 260 °C to maintain a homogeneous melt temperature. If the die entry melt temperature is below 245 °C, the low melt temperature increases viscosity and reduces melt curtain spread; if it exceeds 275 °C, the risk of oxidative gel formation increases. A melt pump is recommended, with pump inlet pressure maintained at 120–160 bar and pump discharge pressure at 200–260 bar.
The die gap is set from 0.6 mm to 0.8 mm. At a die gap of 0.6 mm, the curtain is more sensitive to air disturbances; at 0.8 mm, drawdown is required to reach thin gauges but edge pinning becomes more demanding. The vertical die-to-chill-roll gap is commonly 10–30 mm. The chill roll temperature is held between 18 °C and 25 °C with a closed-loop chiller; fluctuations greater than ±2 °C across the roll face create differential crystallization and distort film flatness.
Failure modes seen at start-up include die-lip drool, melt curtain draw resonance, and edge trim breakage. Die-lip drool is reduced by maintaining the die lip 5–10 °C above the melt temperature and by cleaning the lip with a brass or copper scraper; steel tools damage the chrome finish. Draw resonance above 250 m/min can be suppressed by reducing the die-to-chill-roll gap, increasing air-knife flow, or raising melt temperature within the allowable range. If screen-pack differential pressure rises by more than 30 bar from the clean start-up value, the screen pack is generally changed to prevent gel extrusion.
PF-Y821-CP is a non-hygroscopic polyolefin and does not require drying under normal indoor storage below 70% RH. However, condensation can form when pellet surfaces are cold and the processing hall dew point is high. A surface moisture content above 0.01 wt% may produce steam-induced splay or surface defects in cast film. In such conditions, a dehumidified hopper operated at 60 °C for 2 h reduces surface condensation to an acceptable level. The dryer dew point should be -10 °C or below.
Prolonged storage above 40 °C or direct UV exposure accelerates additive consumption and can raise the yellowness index. The recommended storage is in a dry indoor area below 40 °C, with first-in-first-out inventory rotation. Contact with copper, copper alloys, or halogenated flame retardants should be avoided because these act as oxidation catalysts at film-processing temperatures.
The base resin is generally presented as eligible for food-contact applications under FDA 21 CFR 177.1520 for olefin polymers when the finished article meets end-use conditions and migration limits. In the European Union, compliance is assessed under Regulation (EU) No 10/2011 and its amendments; the overall migration limit is 10 mg/dm² for non-infant food contact articles, or 60 mg/kg for articles with a high volume-to-surface ratio. These declarations do not automatically apply to the finished film because corona treatment, printing inks, and adhesive layers may introduce non-polyolefin species.
| Requirement | Standard or regulation | Key limit |
|---|---|---|
| Food contact resin, United States | FDA 21 CFR 177.1520 | Olefin polymer conditions of use |
| Food contact, European Union | Regulation (EU) No 10/2011 | Overall migration 10 mg/dm² or 60 mg/kg |
| Restriction of hazardous substances | Directive 2011/65/EU (RoHS) | Cd <100 ppm; Pb, Hg, Cr(VI), PBB, PBDE <1000 ppm |
Industrial hygiene and handling require dust control during pellet transfer; LLDPE pellets can generate combustible dust if accumulation exceeds 50 g/m³ in indoor air. The resin is not classified as dangerous goods under UN transport regulations. For the European market, a REACH registration is maintained by the manufacturer, but the user must confirm that imported formulated films meet the downstream article obligations.
For stretch-wrap applications at pre-stretch ratios between 200% and 300%, the final film is evaluated on the wrapper rather than in the laboratory alone because cling force, elongation at break, and machine-direction tear are equipment-dependent. The film type should be tested using ASTM D882 for tensile properties, ASTM D1922 for Elmendorf tear, and ASTM D5748 for puncture propagation energy. Published data for PF-Y821-CP’s performance at very high stretch ratios is limited; converter trials remain the controlling validation method. For direct food contact, migration testing under the intended food simulant and time-temperature condition is required before commercialization.
