| HS Code | 658304 |
| Density | 0.926 g/cm³ (ASTM D792) |
| Melt Flow Index | 3.5 g/10 min (190°C/2.16 kg, ASTM D1238) |
| Melting Point | 122 °C (DSC) |
| Vicat Softening Point | 105 °C (ASTM D1525) |
| Tensile Strength At Yield | 12 MPa (ASTM D638) |
| Elongation At Break | 500% (ASTM D638) |
| Flexural Modulus | 450 MPa (ASTM D790) |
| Izod Impact Strength Notched | No break (ASTM D256) |
| Shore D Hardness | 55 (ASTM D2240) |
| Deflection Temperature Under Load 0 45 Mpa | 55 °C (ASTM D648) |
As an accredited NOVAPOL LLDPE GI-3526-A factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | NOVAPOL LLDPE GI-3526-A is supplied as free-flowing pellets in 25 kg polyethylene bags, palletized and stretch-wrapped for transport. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with NOVAPOL LLDPE GI-3526-A pellets, properly bagged, palletized, and secured for safe transport. |
| Shipping | NOVAPOL LLDPE GI-3526-A is shipped as non-hazardous polyethylene resin pellets in moisture-protective bags, gaylords, or bulk railcars/trucks. Keep dry, avoid direct sunlight and excessive heat. Handle gently to prevent bag damage and contamination. No special hazmat requirements; standard industrial handling and ventilation apply. |
| Storage | Store NOVAPOL LLDPE GI-3526-A in a clean, dry, well-ventilated area, away from direct sunlight, heat, open flames, and ignition sources. Keep containers tightly closed to prevent moisture and contamination. Avoid prolonged outdoor exposure and high temperatures. No special hazardous storage is required, but good housekeeping and proper material handling are recommended. |
| Shelf Life | Store in a cool, dry place away from sunlight. Shelf life is 12 months from date of manufacture. |
NOVAPOL LLDPE GI-3526-A, with nominal melt index 3.5 g/10 min at 190 °C/2.16 kg per ASTM D1238-20 or ISO 1133-1:2022 and nominal density 0.926 g/cm³ per ASTM D792-20 or ISO 1183-1:2019, is conveyed directly from silo or gaylord to the core extruder of high-output cast stretch film lines. In a three-layer A/B/C die configuration, the core layer occupies 70–85% of total web thickness; the cling layer occupies 8–15% and is compounded with polyisobutylene tackifier at 0.8–1.2 wt%, while the release layer occupies 8–15% and carries a slip/antiblock package sufficient to maintain roll unwind without blocking. The GI-3526-A core receives no tackifier and no slip additive unless the converter specifies a differential slip structure for pre-stretch machines. Extrusion on a 90 mm single-screw extruder with 30:1 L/D barrier screw, screen pack 40/60/80 mesh, and downstream feedblock uses melt temperatures of 240–260 °C and die temperatures of 245–255 °C. The die gap is 0.55–0.75 mm, primary air gap 50–80 mm, and chill roll water temperature 15–24 °C. Line speed of 350–550 m/min produces gauge from 8 μm to 23 μm. At draw ratios above 200:1, edge neck-in and transverse thickness oscillations are controlled by electrostatic pinning and full-width vacuum boxes; edge trim is recycled back to the core layer at 5–12 wt% without disrupting web clarity. Pre-drying is not required when the resin is stored below 60% RH; if condensation occurs, hopper drying at 70–80 °C for 2 h with dew point below −40 °C prevents splay and draw instability. Film property release testing follows ASTM D882-18 tensile, ASTM D5748-95(2019) stretch film puncture, ASTM D5458-95 cling, and ASTM D1894-14 coefficient of friction. Food-contact compliance for food-wrap uses is based on 21 CFR 177.1520(c) 3.2a and EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm². Terminal converted products are machine stretch wrap rolls of 250–500 mm width for automatic pallet wrappers operating at 15–35 kg/h wrap rates. A documented operational boundary is that fluoropolymer processing aid levels above 1000 ppm in the core may migrate to the film surface over weeks and reduce coefficient of friction below the range needed for stable pallet stacking; this is quantified by ASTM D1894-14 after 7 days aging at 23 °C.
Heavy-duty sack structures are produced on three-layer blown film lines with GI-3526-A at 65–75 wt% blended with high-pressure LDPE of melt index 0.25–0.35 g/10 min at 20–30 wt% and HDPE of density 0.956 g/cm³ at 5–10 wt%. The HDPE addition increases modulus for filled sacks; the LDPE improves bubble stability under high back pressure. Extruder size is typically 65 mm with grooved feed, 25:1 L/D, and Maddock mixing sections. Die diameter is 250 mm, die gap 1.8–2.4 mm, BUR 2.5:1–3.0:1, and melt temperature 195–215 °C. Operation above 220 °C with GI-3526-A exceeding 75 wt% triggers bubble flutter and gauge variation; quartz heater banks are used to stabilize frost line height at 6–9 die diameters. Downgauging from 150 μm to 95 μm is validated by ASTM D1709-15e1 Method B dart impact, ASTM D1922-15 Elmendorf tear, and ISO 527-3:2018 tensile elongation. In blown film, MD elongation below 450% is treated as an early indicator of excessive HDPE addition or thermal degradation; the extruder profile is then adjusted in 5 °C decrements. Gauge uniformity measured by beta gauge is held within ±10% because wider transverse variation creates leaker seams after sack filling and drop testing. Compliance for industrial sacks follows REACH (EC) No 1907/2006 and requires SVHC content below 0.1% w/w in the finished article. The terminal products are gusseted sacks for 25 kg polymer pellets, mineral powder, and dry construction chemicals, where filled sacks are tested to a 1.2 m drop. A field-documented failure is seam splitting after drop when the HDPE fraction falls below 5 wt% and the melt temperature during processing exceeds 215 °C, producing low melt-strength weld lines.
Coextruded cast film for lamination to biaxially oriented polypropylene or biaxially oriented polyethylene terephthalate uses GI-3526-A as the heat-seal layer at 10–20 μm total thickness. The sealant layer formulation is 85–95 wt% GI-3526-A and 5–15 wt% metallocene LLDPE or ethylene-octene plastomer to lower seal initiation temperature; slip/antiblock masterbatch is added at 1–2 wt% only if coefficient of friction above 0.3 is measured by ASTM D1894-14 on the converted package. Coextrusion is performed on cast lines with die gap 0.45–0.65 mm, melt temperatures 240–275 °C, and chill roll temperatures 18–25 °C. Line speed is 150–250 m/min; above 250 m/min, draw resonance appears as periodic transverse bands unless die gap and air gap are reduced. Seal strength is measured per ASTM F88/F88M-21 at jaw temperatures 130–150 °C, seal pressure 275–414 kPa, and dwell 0.5–1.0 s; hot tack is evaluated per ASTM F2029-16(2021) on the packaging line. Compliance for food-contact laminates is based on 21 CFR 177.1520(c) 3.2a and EU Regulation (EU) No 10/2011, with overall migration testing per EN 1186 and specific migration testing for additives contributed by masterbatches. The terminal converted articles are snack food laminates, frozen food pouches, and hygiene product overwrap. A known process failure is gel formation when sealant layer melt temperature exceeds 275 °C or when residence time exceeds 20 min; gel particles reduce hot tack and are controlled by lowering rear zone temperatures in 5 °C increments and replacing the screen pack after 8–12 h running.
Injection molding of GI-3526-A is limited to thin-wall lids and overcaps with wall thickness not exceeding 1.2 mm; published data for this specific configuration is limited compared with film extrusion. The resin enters the hopper without pre-drying below 60% RH; above this threshold, desiccant drying at 70 °C for 2 h avoids splay. Barrel zone settings from rear to nozzle are 190/200/210/220/230 °C, mold coolant temperature is 15–35 °C, injection pressure 70–110 MPa, hold pressure 50–80 MPa, and back pressure 0.5–1.0 MPa. Screw decompression is limited to 3–5 mm; larger decompression causes air entrapment and gas burn marks. Gate diameter should not be below 1.5 mm and flow length ratio is held below 150:1; longer flow paths lead to short shots or excessive residual stress at the gate. The formulation is 100% GI-3526-A or 98 wt% with 2 wt% color masterbatch. Mechanical tests on injection-molded plaques follow ASTM D638-14 tensile, ASTM D790-17 flexural, and ASTM D256-10e1 Izod impact. Food-contact lids comply with 21 CFR 177.1520(c) 3.2a and EU Regulation (EU) No 10/2011; if the overcap is used in an electrical appliance, Directive 2011/65/EU RoHS limits lead, mercury, cadmium, hexavalent chromium, PBB and PBDE. Terminal products are flexible overcaps for blow-molded HDPE tubs, where the LLDPE lid provides low-torque snap fit and resistance to stress cracking during repeated opening. A recurring molding defect is retained gate stress causing radial cracking after 24 h; mold temperature increased to 30 °C and hold pressure reduced to 50 MPa mitigate the defect in production trials.
Films for forage ensiling and silage bale wrapping are extruded from GI-3526-A on three-layer blown film lines with die gap 2.0–2.5 mm, BUR 2.0:1–2.8:1, and melt temperature 200–215 °C. The upper temperature limit is set by the stabilizer package; melt temperatures above 220 °C degrade hindered amine light stabilizers and reduce outdoor service life. The compound consists of 96–98 wt% GI-3526-A and 2–4 wt% HALS masterbatch, with carbon black or titanium dioxide pigmentation at 1–2 wt% where ultraviolet screening is required. Film gauge ranges from 40 μm for round bale wrap to 100 μm for silage clamp cover. Tensile properties are tested by ISO 527-3:2018, dynamic puncture by ASTM D5748-95(2019), and tear resistance by ASTM D1922-15. The terminal product is exposed to silage organic acids and ultraviolet radiation for up to 12 months; for exposure beyond 2 years, LLDPE cover films require higher HALS loading and additional ultraviolet screening. Compliance in the EU follows REACH (EC) No 1907/2006; where ensiling film contacts animal feed, applicable national food-contact legislation applies, and the polyethylene base generally conforms to EU Regulation (EU) No 10/2011 provided migration limits are met. A field-documented failure mode is transverse splitting at bale corners accelerated by insufficient HALS loading; converter quality control uses FTIR carbonyl index measurement on extruded film before conversion to detect early thermo-oxidative degradation.
Drum liners and intermediate bulk container inner webs are produced from GI-3526-A at 95–98 wt% with carbon black masterbatch at 2–5 wt% for opacity and ultraviolet screening. Blown film extrusion uses die gap 1.8–2.2 mm, BUR 2.2:1–3.0:1, melt temperature 195–210 °C, and gauge 100–200 μm. Carbon black masterbatch above 5 wt% reduces melt strength and produces bubble sidewall vibration; the melt temperature is kept below 210 °C to maintain bubble stability. Low-temperature impact is measured by ASTM D1709-15e1 Method B after conditioning at −20 °C for 24 h, and tear propagation by ASTM D1922-15. Environmental stress crack resistance is tested per ASTM D1693-15 in 10% Igepal CO-630 at 50 °C; industrial liner grades typically show no cracking within 48 h at minimum, though values for this specific formulation require converter confirmation. Compliance for liners sold into the EU follows REACH (EC) No 1907/2006, and food-contact suitability, if the liner contacts packaged food, is established by 21 CFR 177.1520(c) 3.2a. Terminal products are 55–210 L open-head drum liners, FIBC inner liners, and flat bags for powder transport. A documented operational boundary is that liners should not be exposed to aromatic solvents or strong oxidizing acids at temperatures above 40 °C; these conditions accelerate environmental stress cracking and cause premature seam failure.
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NOVAPOL LLDPE GI-3526-A is a linear low-density polyethylene resin supplied by NOVA Chemicals in pellet form for injection moulding. The grade is specified by a nominal melt index of 26 g/10 min at 190 °C under a 2.16 kg load using ASTM D1238-20 or ISO 1133-1:2022, and a nominal density of 0.935 g/cm³ determined by ASTM D1505-18 or ISO 1183-1:2019. The comonomer is 1-hexene rather than butene; the longer short-chain branch increases tie-molecule concentration between crystalline lamellae at a given density, which shifts low-temperature impact and slow crack growth behaviour relative to butene-copolymer LLDPE of equal density and melt index. The grade is intended for applications requiring high flow and moderate rigidity: pails, crates, tote boxes, housewares, thin-wall food containers, closures, and industrial spools.
Because GI-3526-A is an LLDPE, it should not be used as a direct substitute for high-density polyethylene where flexural modulus above 700 MPa or heat deflection temperature above 70 °C is mandatory, nor for autoclave LDPE where high melt elasticity and extensional softening are required for extrusion coating. Published data for certain lot-specific mechanical properties of this exact grade is limited; when no certificate of analysis is available, tensile yield and notched impact must be measured on moulded plaques using ISO 527-2:2012 and ISO 180:2023 rather than inferred from density alone.
| Characteristic | Standard designation | Condition | Use in specification |
|---|---|---|---|
| Melt mass-flow rate | ASTM D1238-20 / ISO 1133-1:2022 | 190 °C, 2.16 kg | Lot acceptance, flow validation |
| Density | ASTM D1505-18 / ISO 1183-1:2019 | 23 °C immersion | Rigidity, crystallinity, sink mark control |
| Tensile properties | ISO 527-2:2012 | 50 mm/min, Type 1A | Yield stress, elongation at break |
| Flexural modulus | ISO 178:2019 | 2 mm/min, three-point bending | Part stiffness under load |
| Vicat softening temperature | ISO 306:2022 | 10 N, 50 °C/h | Short-term thermal resistance |
| ESCR | ASTM D1693-15 | 50 °C, 100% Igepal CO-630, Method B | Stress-cracking comparisons |
| Notched Izod impact | ISO 180:2023 | 23 °C, Type A notch | Toughness, gate region performance |
| Food-contact status | FDA 21 CFR 177.1520; EU 10/2011 | Specific lot and additive package | Conformity for food-contact articles |
Compared with a butene-copolymer LLDPE of the same nominal density and melt index, GI-3526-A is expected to show a higher mean environmental stress crack resistance failure time under ASTM D1693-15 Method B, 100% Igepal CO-630, at 50 °C. The effect arises because hexene short-chain branches produce a more uniform distribution of tie chains across the amorphous layer. Published comparative data for this specific grade is limited; peer-reviewed polyethylene studies have reported F50 increases of 1.5× to 3× when moving from butene to hexene at equal density and melt index, but design cannot rely on that range. Users should run lot-specific ESCR coupons from the same mould geometry and process conditions.
Against an HDPE injection-moulding grade of density 0.952 g/cm³ and melt index 20 g/10 min, GI-3526-A generally shows lower flexural modulus and lower Vicat softening temperature because reducing density from 0.952 g/cm³ to 0.935 g/cm³ lowers fractional crystallinity. In exchange, the LLDPE typically exhibits less warpage and improved low-temperature impact in complex geometries, provided gate freeze and packing are correctly managed. The comparison is test-condition dependent: flexural modulus must be measured by ISO 178:2019 on identical specimen thickness, and notched impact by ISO 180:2023 at the same temperature and notch type.
Compared with an autoclave LDPE of melt index 20 g/10 min, GI-3526-A lacks long-chain branching. The linear backbone reduces melt strength and increases neck-in during extrusion; injection moulding does not require high melt strength, but it does require fast screw recovery and thin-wall penetration, which the linear resin provides. The same linear structure narrows the bubble-stability window if an operator attempts film extrusion. GI-3526-A is not designed for blown film; published data for such use is limited.
Melt index 26 g/10 min implies a lower average molecular weight than extrusion grades; the molecular weight distribution is narrow enough to reduce die swell and improve dimensional reproducibility, but it also reduces melt strength and shear thinning. In injection moulding, the lack of strong shear thinning is partially offset by high melt temperature and high injection speed, but extrusion blow moulding and large-part thermoforming are outside the intended use window because parison sag and sheet sag are more severe than with fractional-melt LDPE or HDPE.
Part design interacts with the crystallisation behaviour. For a density of 0.935 g/cm³, fractional crystallinity is lower than HDPE, so cooling shrinkage is more uniform but still anisotropic. Shrinkage values are not datasheet constants; they depend on gate location, packing pressure, wall thickness, and mould temperature. Mould dimensions should be derived from a cavity-phase shrinkage study conducted on the actual production machine, and shrinkage should be measured according to ISO 294-4:2018 after 24 h at 23 °C. Post-mould shrinkage continues for up to 48 h as secondary crystallisation proceeds; dimensional inspection should be delayed accordingly.
Wall thickness below 1.0 mm can be filled because of the high melt index, but gates must be sized to avoid shear rates above 100,000 s⁻¹. A side-edge gate width of 0.5–0.8 times the wall thickness and a land length equal to the gate width reduce jetting. Ribs should be 40–60% of the adjacent wall thickness to prevent sink marks; sharp corners should be replaced with radii of at least 0.5 mm to avoid stress concentration. Weld lines in filled parts should be located away from high tensile stress regions because LLDPE weld strength can be lower than the parent material; if unavoidable, validate weld-line impact using ISO 180:2023 or ASTM D256-23 on notched specimens cut from the weld line.
Venting is required at the last-fill point. Inadequate venting causes diesel effect and burn marks, and high flow grade increases fill speed. Vent depth for LLDPE should be 0.02–0.03 mm with land length 1.0–2.0 mm and width 3–6 mm per cavity. Runner systems should be balanced; for multi-cavity tools, the flow length from sprue to each gate should not vary by more than 5% unless flow analysis and pressure-drop measurements demonstrate equivalence.
For a 26 g/10 min LLDPE, apparent viscosity at 190 °C and 100 s⁻¹ is approximately one order of magnitude lower than that of a 4 g/10 min LLDPE; spiral flow lengths in a 2 mm deep rectangular channel are therefore longer, but pack pressure must be adjusted because the resin cannot support thick-section drawdown without sink marks. Injection moulders can estimate clamp force from the maximum projected area multiplied by a cavity pressure of 30–40 MPa; a projected area of 0.10 m² at 35 MPa requires 3.5 MN clamp force. Cavity pressure is best measured with piezo-electric transducers at gate and last-fill positions, not inferred from hydraulic pressure.
Screw recovery for a 26 g/10 min pellet is governed more by screw geometry than melt temperature. Reciprocating screws with L/D 20:1 to 22:1 and a compression ratio of 2.5:1 are adequate; high-compression HDPE screws can generate excessive shear heating in the front zone. Back pressure should be maintained between 0.5 MPa and 1.0 MPa, and screw surface speed should be limited to 80–120 m/min to avoid shear-induced degradation. Check-ring wear produces melt leakage and inconsistent shot weight; shot-weight deviation should not exceed 0.2% of target in a validated process.
At melt temperatures above 240 °C, thermal oxidative degradation of LLDPE accelerates. The practical upper melt-temperature limit for this grade is therefore 240 °C; the lower limit for thin-wall filling is approximately 190 °C. Hot-runner manifolds should be set no more than 5 °C above the nozzle setpoint to avoid residence-time degradation. Gate shear rates should be kept below 100,000 s⁻¹ during filling; above this threshold, melt fracture or surface haze may appear in unpigmented parts. If melt residence time exceeds 8 min at 230 °C, oxidation can reduce notched impact strength by more than 30% and shift colour toward yellow. This threshold is derived from general LLDPE thermal-oxidative degradation data; for this exact grade, the current processing guide should be consulted.
Mould temperature should be kept between 10 °C and 40 °C. Lower mould temperature reduces cycle time but increases frozen-in orientation and can raise warpage in flat parts. For flat lids or containers, a mould temperature of 25–35 °C with uniform cooling circuits is preferred. Cooling time can be estimated from the part wall thickness: for a 2 mm wall, cooling time is approximately 5–8 s depending on mould steel and coolant temperature; thicker sections follow a square-law increase. Packing pressure should be 50–70% of injection pressure; holding time must exceed gate freeze time, which for a small edge gate can be 1–3 s. Premature release of holding pressure causes sink marks and dimensional variability. Gate freeze can be verified by weighing parts at incremental holding times; when part weight plateaus, the gate is sealed.
High-flow grades permit fill times below 0.5 s in thin-wall containers; however, injection velocities above 300 mm/s may create jetting and gate blush. Velocity should be profiled: fast to fill runner, slower at gate, fast again to end of fill. Real-time cavity pressure curves should show a rise to 35 MPa at the last-fill point and a decay without abrupt drop; an abrupt drop indicates gate freeze failure or check-ring leakage. Setting the transfer point by cavity pressure rather than screw position reduces shot-weight variation in hot-runner tools.
For machines equipped with accumulators, injection fill time should be matched to the solidification rate of the material; delayed fill can produce hesitation lines and flow marks. The melt should not be overheated to compensate for a worn check ring or undersized machine. A machine using 35–40% of shot capacity per cycle avoids excessively long residence time; if shot size is below 20% of barrel capacity, the resin may sit too long at melt temperature, increasing degradation risk.
When regrind is introduced, particle-size distribution and bulk density change feed behaviour at the hopper throat. A vacuum loader with a regrind ratio up to 20% is common, but higher regrind fractions narrow the processing window because repeated shear history can reduce molecular weight and shift melt viscosity. Regrind should be size-reduced through a granulator with a screen hole size of 8–10 mm and blended offline with virgin pellets in a dry mixer, not hand mixed. Batch-to-batch variance in melt index should be monitored by ISO 1133-1:2022 on the blend; a deviation greater than ±2 g/10 min from the nominal 26 g/10 min requires adjustment of injection speed or melt temperature.
Colour concentrates based on polyolefin carriers are preferred; concentrates with high levels of polar dispersants can reduce ESCR and cause delamination at weld lines. Amine-based stabilizers and some organic pigments can interact with the acid scavenger system of the base resin; if a new colour concentrate is introduced, a full ESCR battery under ASTM D1693-15 and a notched Izod test under ISO 180:2023 should be performed before production approval. Do not combine GI-3526-A with unsaturated oils, strong oxidizers, or halogenated flame retardant systems without evaluating acid scavenger consumption and long-term thermal stability.
Moisture in polyethylene pellets is normally low; however, high-humidity storage above 60% RH or condensation during silo transfer can introduce surface moisture. Surface splay and internal voids may appear when the moisture content exceeds 0.05% by weight. Predrying with dehumidified air at 70 °C for 2 h is recommended for damp regrind or pellets stored outdoors. The resin should not be dried in an oven exceeding 80 °C for extended periods because pellet blocking can occur and antioxidant loss accelerates.
For chemical storage applications, the resin resists many aqueous acids, bases, and polar solvents at ambient temperature, but aliphatic and aromatic hydrocarbons cause swelling and loss of mechanical properties. Unstressed immersion data are not sufficient for chemical containers; compatibility under load must be tested according to ASTM D543-20 with the specific chemical and stress state, because environmental stress cracking is a coupled chemical-mechanical failure mode.
Outdoor applications require UV stabilization; the standard injection-moulding grade is not formulated for long-term UV exposure unless carbon black or a UV stabilizer masterbatch is added. Weathering validation should follow ISO 4892-2:2013 with the actual colour and wall thickness.
Storage in a clean, dry silo or octabin at ambient temperature below 40 °C preserves lot quality; extended outdoor storage under UV exposure can degrade the pellet surface and produce carbonyl species that act as pro-degradants during moulding. Incoming lots should be sampled and tested for melt mass-flow rate and density, not judged by visual appearance alone.
Where food-contact articles are produced, conformity must be confirmed against FDA 21 CFR 177.1520, EU Regulation (EU) No 10/2011, and REACH candidate-list obligations for the specific grade and colour concentrate combination; a generic polyolefin food-contact statement is insufficient. End-use validation must include migration testing according to EN 1186-1:2002 or equivalent for the intended food type and contact time.
