Guangdong Petrochemical HDPE GF7750M2
- Product Name: Guangdong Petrochemical HDPE GF7750M2
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Guangdong Petrochemical HDPE GF7750M2 is typically used in formulations when melt flow rate and density and processing temperature and pressure must be controlled within specific ranges.
| HS Code | 362747 |
| Productname | Guangdong Petrochemical HDPE GF7750M2 |
| Polymertype | High-density polyethylene (HDPE) |
| Density | 0.950 g/cm³ |
| Meltflowrate | 7.5 g/10 min (190°C/2.16 kg) |
| Tensileyieldstrength | ≥25 MPa |
| Elongationatbreak | ≥500% |
| Flexuralmodulus | ≥1000 MPa |
| Vicatsofteningtemperature | ≥120°C |
| Brittlenesstemperature | ≤-70°C |
| Shoredhardness | ≥60 |
| Environmentalstresscrackingresistance | ≥1000 h |
| Ashcontent | ≤0.03% |
| Moisturecontent | ≤0.1% |
| Bulkdensity | ≥0.55 g/cm³ |
| Pelletsize | 2-4 mm |
| Color | Natural |
| Form | Pellets |
As an accredited Guangdong Petrochemical HDPE GF7750M2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Guangdong Petrochemical HDPE GF7750M2: packed in 25 kg woven bags, 40 bags per pallet, totaling 1,000 kg per pallet. |
| Container Loading (20′ FCL) | Container loading (20′ FCL): Guangdong Petrochemical HDPE GF7750M2 in bags, palletized, shrink-wrapped, and securely stowed for ocean export shipment. |
| Shipping | Guangdong Petrochemical HDPE GF7750M2 is a non-hazardous thermoplastic resin. It is shipped in 25 kg bags or 500–1000 kg jumbo bags, palletized and wrapped. Transport in clean, dry trucks or containers, away from moisture, heat, and direct sunlight. Store in a cool, dry, ventilated warehouse. No special dangerous-goods documentation is required. |
| Storage | Store Guangdong Petrochemical HDPE GF7750M2 in a cool, dry, well-ventilated warehouse at ambient temperature, away from direct sunlight, rain, moisture, heat, sparks, and open flames. Keep original bags sealed and palletized. Avoid contamination by oils, acids, or oxidizers. Observe stack-height limits to prevent bag deformation, and use clean handling equipment with good housekeeping. Do not expose to prolonged UV radiation. |
| Shelf Life | Indefinite if stored sealed in original packaging, cool, dry, away from sunlight, heat, moisture, and contaminants; retest after long storage. |
On high-speed bag conversion lines running 10–12 µm HDPE film from Guangdong Petrochemical GF7750M2, the blown film tower is typically configured with 45–65 mm single-screw extruders at L/D 25–30, barrier feed sections, and spiral mandrel dies with die gaps of 1.0–1.8 mm. The melt temperature at the adapter is controlled between 190 °C and 220 °C; a freeze-line height of 6–8 die diameters is maintained for bubble stability. For monolayer structures, GF7750M2 is fed at 100 parts by weight, with 2–5 wt% white or color masterbatch added at the hopper and 0.5–1.5 wt% anti-block masterbatch added where high-speed converting generates surface blocking. Draw-down to 10 µm requires a blow-up ratio of 3.0:1–4.5:1; below 8 µm, gauge variation may exceed ±8% unless automatic air-ring control with capacitance thickness scanning is used. Density of the extruded film is verified by ASTM D1505, melt index by ISO 1133-1:2022, tensile yield strength by ASTM D882, and Elmendorf tear by ASTM D1922. Food-contact suitability for bulk dry grocery use is assessed under FDA 21 CFR 177.1520 and EU No 10/2011; specific migration testing is required when the sack contacts fatty or aqueous food at temperatures above 40 °C.
Converted outputs include die-cut T-shirt sacks, star-sealed bin liners, and perforated produce rolls. High-speed bag machines operating at 250–400 cycles/min require film with low blocking and consistent slip; the film coefficient of friction measured according to ASTM D1894 is typically kept below 0.30 for continuous wicket punching. The high-molecular-weight distribution of GF7750M2 increases bubble stability at thin gauge but can raise melt pressure; extruder head pressure is monitored at 30–45 MPa, and screen pack changes are scheduled after 8–12 h when post-consumer regrind is not used. If the converter runs a 50/50 blend of GF7750M2 and LLDPE for improved dart impact, the melt temperature should be lowered by 5–10 °C to prevent film whipping and the frost-line height increased by 1–2 die diameters.
What limits puncture resistance in high-molecular-weight HDPE liner film?
Puncture resistance in 25–50 µm HDPE refuse sacks is governed by film thickness, density, and orientation balance. GF7750M2 can be processed as a monolayer at 100 parts by weight or as a three-layer coextrusion with a post-industrial/post-consumer HDPE core at 20–40 wt%, plus 2–3 wt% carbon black masterbatch for UV resistance. Dart impact is evaluated according to ISO 7765-1 or ASTM D1709 method A; when the structure drops below 15 µm, dart impact values fall below 70 g for typical HDPE and the sack is unsuitable for glass or construction waste unless blended with 15–20 wt% LLDPE. Blown film lines are set with a die gap of 1.5–2.0 mm, melt temperatures of 190–215 °C, and a blow-up ratio of 2.5:1–3.5:1 to balance machine-direction and transverse-direction tear. Tensile strength at break is measured by ASTM D882 or ISO 527-3 on 25 mm strips; MD/TD imbalance above 1.4:1 correlates with split failures on the bag bottom seal. Compliance for commercial refuse sacks is anchored to EN 13592 for household refuse sacks, and to REACH SVHC content restrictions when recycled feedstocks are introduced.
On production-scale lines, the most frequent failure mode in coextruded structures is interfacial instability between the recycled core and virgin skin layers. This appears as gauge bands at the frost line and is corrected by matching melt viscosities within 15% at shear rates of 100 s⁻¹ to 1,000 s⁻¹. Lines running GF7750M2 with 20 wt% LLDPE in the outer layers exhibit reduced die lip build-up when purged with a LLDPE-rich transition at shutdown. Drop impact on 50 µm film increases by 20–30% when the blow-up ratio is reduced from 3.5:1 to 2.5:1, but transverse-direction tear then decreases; bag side seams should be positioned on the transverse direction only after verifying tear values above 20 N/mm. Finished products are 60–120 L domestic refuse sacks, heavy-gauge construction debris sacks, and hospital waste liners where incineration-compatible masterbatches are required.
Flat-Die Geomembrane Extrusion and Test Panel Variability
Geomembrane sheet from HDPE is manufactured on flat-die extrusion/calendering lines with thickness from 0.75 mm to 2.00 mm. GF7750M2 may be considered where its density is between 0.940 g/cm³ and 0.955 g/cm³, but published data for this exact grade in geomembrane configurations is limited; converters must qualify the resin against GRI-GM13 specification values for 1.5 mm smooth HDPE geomembrane. Melt temperature at the flat die is held at 200–230 °C, with chill roll temperatures at 60–80 °C to reduce warpage. Formulation is typically 100 parts GF7750M2 with 2.0–3.5 wt% carbon black masterbatch and 0.5–1.0 wt% antioxidant/process stabilizer masterbatch; no filler is used if stress crack resistance is required. The calendered sheet is tested per ASTM D5199 for thickness, ASTM D1505 for density, ASTM D1238 for melt flow, ASTM D638-14 for tensile yield and break, ASTM D1004 for tear, ASTM D4833 for puncture, and ASTM D5397 for single-point notched constant tensile load stress crack resistance. In production-scale runs, edge trim is recycled at 10–25 wt% into the core layer, while outer layers remain virgin to preserve stress crack resistance.
| Parameter | Method | Specimen condition |
|---|---|---|
| Thickness | ASTM D5199 | Calendered sheet, as-produced |
| Density | ASTM D1505 | 23 °C, sheet sample |
| Melt flow rate | ASTM D1238 | 190 °C/2.16 kg |
| Carbon black content | ASTM D4218 | 2.0–3.0 wt% |
| Stress crack resistance | ASTM D5397 | SP-NCTL, 50 °C, 10% Igepal |
Finished geomembrane products include landfill liners, pond liners, and mining heap leach pads where the sheet is welded by double-track hot-wedge machines at 380–420 °C and seam peel strength is checked per ASTM D6392. Panel width is typically 5–7 m; thickness variation across the width must stay within ±5% to avoid bridging during deployment.
In a three-layer cast film structure for dry-food overwrap, a 15–25 µm HDPE layer based on GF7750M2 is inserted between a sealant LDPE or EVA layer and a skin LLDPE layer. The HDPE layer is added at 20–35 wt% of total film thickness; this ratio increases the secant modulus at 1% strain but reduces dart impact if the outer layers are thinner than 10 µm. Extruder sizes for the HDPE core are typically 45–60 mm single-screw with L/D 28–32; melt temperature at the feedblock is 205–225 °C, and the cast roll is maintained at 18–25 °C to prevent blocking. Compliance is assessed under FDA 21 CFR 177.1520 and EU No 10/2011, with migration testing according to EN 1186; for dry bakery applications, organoleptic testing per ASTM E1870 may be required to rule out off-taste. Terminal package types include cereal-bar wrappers, cracker flow-wrap, and frozen-food lamination films where stiffness prevents package deformation.
When this structure is run on high-speed flow-wrap lines at 80–120 m/min, the HDPE layer is frequently the source of curl due to differential shrinkage. Curl is minimized by setting the chill roll temperature 3–5 °C below the film surface temperature measured at the die exit, and by maintaining the corona treater at 40–42 dyn/cm for print adhesion. If a coextruded blown film line is used instead, the blow-up ratio should be limited to 2.0:1–2.8:1 because higher ratios create transverse-direction stiffness that causes bag telescoping on form-fill-seal machines.
When HDPE replaces LDPE in PP woven sack lamination
Extrusion lamination of PP woven fabric with HDPE produces a moisture-barrier layer for fertilizer, pet food, and chemical packaging. GF7750M2 is processed at 280–310 °C in a 90–120 mm single-screw extruder with L/D 30:1 and a slot die; the molten curtain is drawn to 12–20 µm and nipped against a corona-treated PP fabric. Because HDPE oxidation at these temperatures is more rapid than LDPE, a process stabilizer masterbatch at 0.5–1.0 wt% is added to the 100 parts of GF7750M2, and melt residence time is kept below 15 min. Adhesion is evaluated by a peel test according to ASTM D1876; values below 2 N/15 mm are typical if the fabric treatment level is below 40 dyn/cm. The laminated fabric is tested for hydrostatic head according to ISO 811 and for puncture resistance by ASTM D751. Compliance for chemical packaging requires REACH and RoHS documentation; food-contact fertilizer sacks additionally require compliance with EU No 10/2011 for multi-material packaging. Terminal products are 10–50 kg PP woven sacks, FIBC outer panels, and tarpaulin sheeting.
On production-scale laminators, the limiting defect is edge neck-in of the HDPE curtain; neck-in increases from 8–12 mm at 20 µm coating thickness to 15–20 mm when the coating is drawn below 12 µm, forcing wider slot die settings and higher trim waste. To stabilize the curtain, the die-to-nip air gap is maintained at 100–150 mm, and the melt temperature is raised by 5 °C when line speed exceeds 80 m/min. If the fabric is not corona-treated to at least 38 dyn/cm, intermittent peel delamination occurs on the printed areas where ink binder reduces surface energy.
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- Guangdong Petrochemical HDPE GF7750M2 is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: admin@ascent-chem.com.
Guangdong Petrochemical HDPE GF7750M2 is a high-density polyethylene blown film extrusion resin produced by Guangdong Petrochemical Company Limited. The commercial model designation GF7750M2 identifies a bimodal high-density polyethylene architecture within the Guangdong Petrochemical HDPE portfolio. In this polymer architecture, a low molecular weight fraction contributes to extruder output and melt flow, while a high molecular weight fraction contributes to bubble stability, tensile strength, tear resistance and dart impact resistance. The grade is positioned for thin-gauge high-strength film applications in which downgauging, stiffness and puncture resistance are concurrent conversion requirements. The resin is not chemically modified; its performance arises from molecular weight distribution, comonomer placement and polymerisation control rather than from additive loading alone.
The polymer is supplied as opaque pellets with a nominal density of 0.952 g/cm³ when measured according to ISO 1183-1:2019. Melt index is conventionally reported under a 21.6 kg piston load at 190 °C because the high-molecular-weight fraction renders the standard 2.16 kg melt index impractically low for routine quality control. The high-load melt index is approximately 7.5 g/10 min under ISO 1133-1:2022. These two values define the grade within the HDPE film family: density controls film modulus, moisture barrier and yield stress, while high-load melt index indicates the melt pumpability and draw characteristics required for high-stalk blown film processes.
What Specification Values Are Used to Characterize GF7750M2 Film Resin?
Film performance data for GF7750M2 are generated on laboratory blown film samples produced under controlled conditions. The values in the table below are representative values from grade-class technical literature and should be confirmed against the manufacturer’s certificate of analysis for a specific batch. Film mechanical properties are not intrinsic only to the resin; they shift with blow-up ratio, die gap, frost line height and film thickness.
| Property | Test Method | Typical Value |
|---|---|---|
| Density | ISO 1183-1:2019 | 0.952 g/cm³ |
| High-load melt index, 190 °C, 21.6 kg | ISO 1133-1:2022 | 7.5 g/10 min |
| Tensile stress at break, machine direction | ISO 527-3:2018 | 55 MPa |
| Tensile stress at break, transverse direction | ISO 527-3:2018 | 45 MPa |
| Elongation at break, machine direction | ISO 527-3:2018 | 600 % |
| Elongation at break, transverse direction | ISO 527-3:2018 | 700 % |
| Dart drop impact, 50 µm film, F50 | ISO 7765-1:2019 | 150 g |
| Elmendorf tear strength, machine direction | ISO 6383-2:2016 | 15 N |
| Elmendorf tear strength, transverse direction | ISO 6383-2:2016 | 25 N |
| Vicat softening temperature, 10 N load | ISO 306:2022 | 125 °C |
The ISO 527-3:2018 tensile values are determined on 50 µm blown film at a crosshead speed of 500 mm/min. Dart impact is reported as the mass at which 50 % of specimens fail under ISO 7765-1:2019; the result is sensitive to film gauge, bubble cooling and laboratory temperature. Elmendorf tear strength values under ISO 6383-2:2016 are single-tear values that rank film orientation balance. These data are not to be read as guaranteed specification limits; they describe the typical position of the grade when processed within the recommended window.
On blown film extrusion lines with screw L/D ratios of 24:1 to 30:1, GF7750M2 is normally processed with barrel temperatures between 180 °C and 200 °C and a die zone temperature of 190–205 °C. The melt temperature should remain below 210 °C to avoid oxidative chain scission of the high-molecular-weight tail, which produces gels, bubble flutter and reduced tear strength. Below 175 °C, extruder back pressure rises and melt fracture may appear as shark-skin roughness on the film surface. Blow-up ratios of 3.0:1 to 4.0:1 are typically used, with the frost line held at 6–10 die diameters above the air ring. This stalk-height range balances machine-direction and transverse-direction orientation; excessive stalk height raises transverse direction tear strength but reduces dart impact and increases film curl.
Production-scale observation indicates that bubble instability is most commonly linked to accumulated die lip deposits, uneven air-ring velocity, or melt temperature excursions above 210 °C. The grade’s bimodal molecular weight distribution supports a stable stalk in high-stalk processing, but quantitative stalk-height limits should be established on the specific line because die diameter, air-ring design and cooling-air temperature create strong equipment-dependent variability. Published data for this specific configuration are limited; converters routinely validate a frost line set point with gauge-profile and tear-strength mapping.
When GF7750M2 Replaces a Conventional Unimodal HDPE Film Grade in Heavy-Duty Sacks
Replacement of a conventional unimodal HDPE film grade with GF7750M2 requires rebalancing of downstream processing conditions rather than direct drop-in substitution. The bimodal molecular weight distribution typically produces a wider orientation window at equivalent density and high-load melt index. This permits gauge reduction in heavy-duty sacks, industrial liners and carrier bags without proportionally sacrificing dart impact or tensile strength. In comparative trials, converters often observe improved bubble stability at higher stalk heights, but the effect is operational rather than inherent unless the die gap, air-ring setting and take-off speed are adjusted to the grade’s melt strength.
A key difference from conventional unimodal HDPE film resins lies in the tear-strength balance. Unimodal HDPE film grades at similar density can show a strong machine-direction tear orientation; GF7750M2 is designed to deliver a more balanced machine-direction and transverse-direction tear profile. This reduces splitting failure along the sack side seam. The difference arises from molecular weight distribution and chain orientation during bubble draw, not from a change in polymer chemistry. At a density near 0.952 g/cm³, the grade retains higher modulus than many linear low density polyethylene film resins, but it does not match the dart impact of LLDPE-rich blends. Coextruded film structures may combine GF7750M2 as a stiffness layer with LLDPE or metallocene LLDPE skins for high toughness.
Compared with high-molecular-weight HDPE pipe grades or blow moulding grades, GF7750M2 is not intended for pressure piping, injection moulding, or parison-based hollow container production. It is not classified as PE100 under ISO 9080:2022 and should not be used for gas distribution, buried pressure pipe, or continuous hydrostatic service. Compared with high-speed injection moulding HDPE grades, GF7750M2 has a higher molecular weight tail and lower flow under low load, which is inappropriate for thin-wall injection moulding. The product should be specified only for blown film, cast film where melt strength permits, or thin-sheet extrusion after verification on the target line.
The stiffness advantage over LLDPE also creates a limitation. At sub-zero temperatures, high-density polyethylene film becomes more brittle than LLDPE. Frozen-food packaging or outdoor winter exposure should be evaluated by low-temperature dart impact and flex-crack resistance under conditions specific to the service temperature. If the application requires impact performance below −20 °C, GF7750M2 should be blended with an impact modifier or replaced by an LLDPE-rich layer.
Film Processing Window, Orientation Effects and Chemical Boundary Conditions
The operating boundaries for GF7750M2 in blown film are defined by melt temperature, die gap, blow-up ratio and frost line height. A die gap between 1.2 mm and 1.8 mm is typical for low- to medium-output HDPE film lines. Narrower die gaps increase shear stress and may intensify melt fracture; wider die gaps reduce orientation but require higher draw-down. Blow-up ratios below 2.5:1 can produce excessive machine-direction orientation and poor transverse direction tear strength. Blow-up ratios above 4.5:1 may reduce bubble stability and increase gauge variability. The grade’s high molecular weight tail supports high-stalk processing, but frost line height must be kept within the range determined on the specific extrusion line to avoid film blocking and erratic roll geometry.
Chemical exposure boundaries follow general high-density polyethylene service limits. GF7750M2 is not recommended for storage of chlorinated solvents, strong oxidising acids above 40 °C, or high terpene concentrations because these agents can cause environmental stress cracking or swelling. For packaging of surfactants, detergents and diluted agrochemical formulations, full filled-pack tests at 40 °C to 60 °C are necessary to evaluate weld seams, creases and film edges. Environmental stress cracking in film is most severe at sharp folds and heat-sealed edges, where internal stress concentrates. The grade’s high molecular weight fraction delays crack propagation, but it does not eliminate the requirement for formulation-specific compatibility testing.
Food-contact status must be assessed on the finished article, not on the pellet. The base olefin polymer may satisfy FDA 21 CFR 177.1520 and Regulation (EU) No 10/2011 for olefin polymers, but migration, organoleptic and additive compliance must be demonstrated for the final film structure, printing inks, surface treatments and sealing layers. REACH and RoHS status should be confirmed through the supplier’s safety data sheet and product compliance declaration. GF7750M2 is not supplied with an automatic food-contact guarantee for all jurisdictions or all film constructions.
Outdoor weathering is an operational boundary. Without a UV stabiliser package, HDPE film will undergo oxidative embrittlement and lose tensile strength after sustained ultraviolet exposure. GF7750M2 should be formulated with a UV stabiliser masterbatch if used in agricultural film, outdoor covered storage, or construction film. Stabiliser addition levels should be validated by accelerated weathering under ISO 4892-2:2021 or equivalent, with a defined endpoint such as 50 % retained elongation. The base resin alone is not a UV-stable product.
