Chevron Phillips Chemical HDPE 9502H-9503H
- Product Name: Chevron Phillips Chemical HDPE 9502H-9503H
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Chevron Phillips Chemical HDPE 9502H-9503H is typically used in formulations when melt index, density, and molecular weight distribution and melt temperature, die pressure, and blow-up ratio must be controlled within specific ranges.
| HS Code | 831546 |
| Polymer Type | High Density Polyethylene (HDPE) |
| Comonomer | Hexene |
| Density | 0.950 g/cm³ (9502H); 0.955 g/cm³ (9503H) |
| Melt Index 190 C 2 16 Kg | 0.20 g/10 min (9502H); 0.30 g/10 min (9503H) |
| Tensile Strength At Yield | 26.2 MPa |
| Tensile Strength At Break | 31.0 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1100 MPa |
| Environmental Stress Crack Resistance Escr | >1000 h |
| Vicat Softening Point | 125°C |
| Brittleness Temperature | < -70°C |
| Hardness Shore D | 65 |
| Color | 9502H: Natural; 9503H: Black |
| Uv Stabilization | 9503H: UV stabilized |
| Thermal Conductivity | 0.45 W/m·K |
| Water Absorption | <0.01% |
As an accredited Chevron Phillips Chemical HDPE 9502H-9503H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Chevron Phillips Chemical HDPE 9502H-9503H is packaged in 25 kg (55 lb) polyethylene bags, available in palletized quantities. |
| Container Loading (20′ FCL) | Chevron Phillips Chemical HDPE 9502H-9503H resin, 25 kg bags, palletized, loaded into a 20′ FCL container for export shipment. |
| Shipping | Chevron Phillips Chemical HDPE 9502H-9503H is a non-hazardous high-density polyethylene resin. It is typically shipped in 25-kg bags, bulk bags, or bulk trucks/railcars. Not DOT/IMDG/IATA regulated; no UN number, hazard class, or packing group. Store dry, away from heat and contamination. |
| Storage | Store Chevron Phillips Chemical HDPE 9502H-9503H in a cool, dry, well-ventilated area away from direct sunlight, heat, moisture, and ignition sources. Keep original packaging closed, clean, and palletized to prevent contamination, dust, and moisture pickup. Avoid incompatible materials. Maintain ambient temperatures, observe FIFO, and follow local regulations and SDS recommendations. Do not expose to ultraviolet light or excessive stacking. |
| Shelf Life | Shelf life is indefinite under normal storage conditions; keep dry in original packaging, away from sunlight, heat, and ignition sources. |
On single-layer blown-film lines converting high-molecular-weight HDPE into thin-gauge T-shirt sacks, Marlex 9502H is typically dry-blended at 70–85 wt% with 15–30 wt% of a C6 or C8 gas-phase LLDPE having a melt index of 0.8–1.2 g/10 min; slip/antiblock masterbatch is added at 2.0–4.0 wt%, and a fluoroelastomer polymer processing aid is dosed at 200–500 ppm to suppress sharkskin as line speed approaches output rates of 0.6–0.9 kg/h per mm of die circumference. The resin is controlled to a melt index of 0.30 g/10 min under ASTM D1238 at 190 °C and 2.16 kg, with a nominal density of 0.950 g/cm³ per ASTM D1505. Processing on grooved-feed extruders with barrier screws and 30:1 L/D, using die diameters of 150–250 mm, requires die gaps of 1.2–1.6 mm, blow-up ratios of 3.0:1–4.5:1, and frost-line heights maintained at 5–7 die diameters; melt temperatures are held at 193–210 °C to balance bubble stability and transverse-direction tear. Compliance documentation for this application segment includes ASTM D4976 for polyethylene film, FDA 21 CFR 177.1520(c) for olefin polymer food-contact use where produce or deli bags are produced, EU No 10/2011 for export food-contact films, and 2011/65/EU RoHS recast for heavy-metal residue screening. Terminal products produced within this operating window include T-shirt sacks at 9–25 µm film thickness, produce bags, retail checkout bags, and low-duty can liners. One operational boundary is that increasing LLDPE above 30 wt% depresses the 1% secant modulus below the stiffness threshold required by automated bagging equipment; lowering melt temperature below 193 °C with narrow die gaps produces visible melt fracture and increases die-pressure variability across the extrusion run.
Why Does 9503H Outperform Conventional HMW Film in Agrichemical Pouch and Drum Liner Structures?
The substitution of Marlex 9503H into agrichemical liner structures is based on its higher environmental stress-cracking resistance relative to standard HMW film grades, measured under ASTM D1693 Condition B in 10% Igepal CO-630; the specification commonly requested for aggressive liquid formulations is ≥100 h without cracking. In a three-layer blown-film structure, the core layer is run at 70–85 wt% 9503H, with an LLDPE sealant skin at 10–20 wt% and a carbon-black or UV-stabilized outer layer at 5–10 wt%; if a monolayer alternative is used, 9503H is let down at 90–100 wt% with a carbon-black masterbatch at 2.0–3.0 wt% and a hindered-amine light stabilizer package at 0.3–0.8 wt%. Film fabrication is performed on water-quenched or air-quenched blown-film lines with die gaps of 1.6–2.0 mm, blow-up ratios of 2.0:1–3.0:1, melt temperatures of 204–221 °C, and finished film thicknesses of 75–150 µm; the water-quench route is used when film haze below 8% is required for outer-package printing. Compliance documentation for this segment typically includes UN Model Regulations 6.1.3 inner-packaging qualification for dangerous goods when the liner is used in UN-certified drums, 49 CFR 173.24 for U.S. domestic transport, ASTM D638 for tensile yield, ASTM D1709 for dart-drop impact, and ASTM D1922 for Elmendorf tear. Terminal finished goods include fertilizer bag liners, pesticide pouch films, liquid agrichemical drum liners, seed-treatment pouch webs, and FIBC inner liners. The operational boundary for 9503H is that high levels of calcium stearate or certain antistatic amines can reduce interfacial seal strength; pre-production seal testing per ASTM F88 is therefore required whenever slip-agent or masterbatch sources are changed.
Cereal and Cracker Liner Coextrusion: Layer Distribution and Sealant Compatibility
In three-layer coextrusion of dry-food cereal liners, the 9502H core is specified at 55–75 wt% of the total structure because its 0.950 g/cm³ density and 0.30 g/10 min melt flow provide the bending stiffness that prevents liner collapse during vertical form-fill-seal operations, while an LLDPE or LDPE sealant skin at 15–25 wt% supplies a heat-seal initiation temperature sufficiently below the HDPE melting point to avoid jaw sticking at seal bars operating above 110 °C. Titanium dioxide or white masterbatch is dosed at 5–10 wt% in the core or outer layer; erucamide slip agent is added at 500–1,500 ppm to control coefficient of friction for downstream bag insertion. The film is produced on three-layer blown-film lines with die gaps of 1.5–2.5 mm, blow-up ratios of 2.5:1–3.5:1, internal bubble cooling, and melt temperatures of 200–225 °C; corona treatment of the sealant side at 38–42 dyn/cm is used when subsequent lamination or printing is required. Food-contact compliance is documented under FDA 21 CFR 177.1520(c) for olefin homopolymers and copolymers, EU No 10/2011 for overall migration limits, and good manufacturing practice under 21 CFR 174.5; where the liner is used in direct contact with dry cereals, extraction testing per 21 CFR 176.170(c) or EU 10/2011 food simulant E is used to verify migration. Terminal products include cereal box liners, cracker slug-wrapped liners, dry snack pouches, and dry pet food inserts. The structural limitation of HDPE-rich cereal liners is oxygen transmission; the 55–75 wt% 9502H core does not contribute oxygen barrier, so if rancidity-sensitive cereal formulations require an oxygen transmission rate below 10 cm³/m²·day·atm, an EVOH or metallized layer must be introduced into the coextrusion stack.
Drum-liner converters specifying Marlex 9503H for industrial film above 125 µm encounter a different set of extrusion limits than thin-gauge sack operations, because bubble cooling and roll blocking rather than tensile strength control the production rate. Typical dry-blend ratios are 50–70 wt% 9503H with 30–50 wt% of a C8-LLDPE having a density of 0.912–0.920 g/cm³; this blend balance preserves low-temperature dart impact while retaining enough HDPE rigidity for open-mouth drum insertion. Slip/antiblock masterbatch is incorporated at 2.0–5.0 wt%, and black masterbatch at 2.0–4.0 wt% when UV resistance is specified. Processing on large-diameter blown-film lines with 300–600 mm dies, 1.8–2.5 mm die gaps, and internal bubble cooling uses blow-up ratios of 1.8:1–2.8:1 and melt temperatures of 200–230 °C; bubble diameters at these gauge ranges make air-ring stability the rate-limiting factor, and specific outputs typically fall by 30–45% when final thickness is increased from 50 µm to 200 µm. The applicable property documentation includes ASTM D4976, ASTM D1709 for dart-drop impact, ASTM D1922 for Elmendorf tear, ASTM D1693 for environmental stress-cracking resistance, ISO 1183 for density, and 2011/65/EU RoHS recast for heavy-metal restrictions in export packaging. Terminal product types are drum liners, waste-container liners, gaylord box liners, FIBC inner liners, and contamination-control liners for controlled-environment waste streams. An operational boundary is that blends containing more than 50 wt% C8-LLDPE lose the modulus required for automated liner insertion and increase blocking at wound-roll pressures exceeding 0.2 MPa; batch-to-batch variation in masterbatch moisture also requires closed feed hoppers when plant relative humidity exceeds 60%.
When Sheet Extrusion Must Satisfy GRI-GM13 for Smooth HDPE Geomembrane
Sheet extrusion of smooth HDPE geomembrane from Marlex 9502H or 9503H requires separate control of extruder backpressure, carbon black dispersion, and chill-roll crystallinity because the finished sheet is field-welded and must pass seam-peel tests under ASTM D6693 and stress-cracking tests under ASTM D5397. The formulation is run at 97.0–98.0 wt% resin with a carbon-black masterbatch at 2.0–3.0 wt%; carbon-black concentration in the compounded sheet is verified by ASTM D4218 or ISO 6964, and dispersion is assessed by ASTM D5596 microscopy. An antioxidant package is incorporated at 0.2–0.5 wt% so that standard oxidative induction time under ASTM D3895 meets the 100 min minimum average specified in GRI-GM13, with high-pressure oxidative induction time under ASTM D5885 used for long-term durability screening. Flat-die extrusion on single-screw machines with 30:1 L/D and die widths of 2.5–7.0 m is performed at melt temperatures of 200–230 °C, with polished chill-roll temperatures of 70–90 °C to control microcrystallinity and minimize residual stress; sheet thickness is controlled from 0.75 mm to 2.50 mm with an online thickness scanning system using beta or X-ray backscatter. Finished geomembrane types include landfill bottom and cap liners, heap-leach pads, pond liners, canal liners, and secondary containment membranes. The critical seam-weld limitation is that carbon black macro-dispersion defects or moisture absorption above 0.02% in regrind streams lower weld peel strength and create notch-sensitive failure at weld edges; consequently, regrind addition in geomembrane sheet is generally limited to 10–20 wt% and requires pre-drying when storage ambient relative humidity exceeds 60%.
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- Chevron Phillips Chemical HDPE 9502H-9503H 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: sales8@ascent-chem.com.
Within the high-density polyethylene portfolio of Chevron Phillips Chemical, the HDPE 9502H-9503H series denotes two high-molecular-weight, hexene-modified blow molding copolymers supplied as natural pellets. The series is specified for extrusion blow molding rather than injection molding or blown film extrusion. Manufacturer-published nominal data place the density between 0.951 g/cm³ and 0.955 g/cm³ when measured under ASTM D1505-18 or ISO 1183-1:2019. Melt flow, measured at 190 °C with a 2.16 kg weight under ASTM D1238-20, falls within the fractional-melt range of 0.25 g/10 min to 0.35 g/10 min. The processing-relevant high-load melt index at 190 °C and 21.6 kg is reported in the range of 28 g/10 min to 32 g/10 min. These values position the series between conventional medium-molecular-weight HDPE used for small containers and very-high-molecular-weight HDPE used for large industrial parts.
Typical end uses include industrial containers, agricultural chemical packaging, intermediate bulk container liners, large fuel or water tanks, and blow molded automotive reservoirs. The hexene comonomer increases tie-molecule density relative to butene-modified HDPE at similar nominal density and melt flow. This architectural shift is selected for service environments in which slow crack growth resistance governs container lifetime. No generic application approval applies; converters are required to validate each end-use formulation under the actual aggressive liquid, temperature, and stacking load.
Because the two grades are sold as an integrated series, the certificate of analysis is the controlling document for lot-specific melt flow, density, and additive package. Nominal technical data do not set batch release limits. Processors maintaining incoming inspection protocols should compare lot values against the internal process capability index rather than against a fixed sales specification alone.
What Separates Hexene-Modified 9502H-9503H from Butene-Based Blow Molding Grades?
At equal melt flow and density, the hexene comonomer in the 9502H-9503H series produces a measurable increase in environmental stress crack resistance under ASTM D1693-15, Condition B, in 100% Igepal CO-630 at 50 °C. Butene-modified HDPE grades tend to exhibit shorter time to 50% failure in the same notched bent-strip test. The difference becomes more apparent at densities below 0.955 g/cm³ because the longer hexene branch increases tie-molecule concentration without requiring a large density reduction.
In extrusion blow molding, the series also exhibits broader molecular weight distribution than narrow-MWD medium-molecular-weight HDPE. This broadening increases shear thinning and die swell during parison formation. On accumulator-head machines with parison programming, the higher swell supports large-diameter parisons and permits wall-thickness redistribution without premature sag. The trade-off is a higher melt pressure at the die bushing than would be observed for a narrow-MWD HDPE of equivalent melt index.
Compared with a butene-modified HDPE of equivalent density, the 9502H-9503H series requires a lower melt temperature for equivalent parison sag resistance because of its melt strength. Compared with a very-high-molecular-weight HDPE with high-load melt index below 20 g/10 min, the series lowers extruder torque and die head pressure at equivalent screw speed. These differences make the series specifically adapted to large-part blow molding where both melt strength and process throughput are constraints.
The following values are manufacturer-published nominal property ranges for the unfilled natural series. They are not batch specification limits; lot release values appear on the certificate of analysis.
| Property | Test method | Series range |
|---|---|---|
| Density | ASTM D1505-18 / ISO 1183-1:2019 | 0.951–0.955 g/cm³ |
| Melt index at 190 °C/2.16 kg | ASTM D1238-20 / ISO 1133-1:2022 | 0.25–0.35 g/10 min |
| High-load melt index at 190 °C/21.6 kg | ASTM D1238-20 / ISO 1133-1:2022 | 28–32 g/10 min |
| Tensile strength at yield | ASTM D638-14 | 25–28 MPa |
| Flexural modulus | ASTM D790-17 | 1.10–1.30 GPa |
| ESCR, notched, 100% Igepal, 50 °C | ASTM D1693-15 | ≥600 h |
| Vicat softening temperature | ASTM D1525-17 | 124–127 °C |
| Brittleness temperature | ASTM D746-14 | ≤-75 °C |
At processing-relevant shear rates, the ratio of high-load melt index to low-load melt index for the series is approximately 90:1 to 100:1, indicating broad molecular weight distribution. This rheological signature correlates with high melt strength and pronounced die swell in accumulator-head blow molding. The ratio is not a substitute for full dynamic mechanical rheology under ISO 6721-10, but it is used as a rapid incoming-inspection control.
Within the series, 9502H is positioned at the lower end of the density range to maximize ESCR and impact resistance, while 9503H is positioned at the upper end of the density range to raise flexural modulus and top-load strength. The separation in flexural modulus is smaller than the separation between either grade and a butene-based control at comparable melt flow. This allows the selection to be driven primarily by the required ESCR-to-stiffness balance rather than by large shifts in processing behavior.
Extruder Torque, Melt Temperature, and Parison Sag Boundaries
Single-screw extruders with 24:1 to 30:1 L/D and barrier-flighted screws equipped with moderately deep feeding sections and shallow metering channels are used on continuous shuttle, wheel, and accumulator-head lines. Barrel temperatures are typically set from 190 °C to 220 °C across the feed-to-metering profile. Head and die zones are maintained at 200 °C to 220 °C. Melt temperature should remain below 230 °C; extended operation above 235 °C can initiate oxidative degradation, increase gel formation, and reduce parison melt strength. Screw speed and back pressure must be adjusted so that shear heating does not raise melt temperature more than 5 °C above the die set point.
Accumulator-head tooling for this series typically requires die gaps between 2.0 mm and 4.0 mm for large containers. The die gap must be set wider than that used for a medium-molecular-weight HDPE because of the higher die swell. Wall-thickness programming is commonly used to add material in the lower half of the parison to compensate for sag. If the clamp force is insufficient on large multi-cavity molds, flash formation and parting-line thickening result; machines in the 200 to 1,000 metric ton clamp range are assigned based on container volume and cavity count.
Mold temperature control for extrusion blow molding of the series uses chilled water at 10 °C to 15 °C for rapid solidification and cycle-time reduction. Pinch-off geometry must be sharp to generate a strong weld and minimize flash thickness. Incompatible blends with polypropylene or mineral-filled regrind are not recommended without pre-compounding on a corotating twin-screw extruder; direct dry blending through a single-screw extruder can create localized phase separation and stress concentrations at the pinch-off weld.
Environmental stress crack resistance of the series is evaluated on notched bent strips in 100% Igepal CO-630 at 50 °C under ASTM D1693-15. The series is not immune to all stress cracking agents. Concentrated oxidizing acids, certain surfactant blends, and aromatic or halogenated hydrocarbon solvents can accelerate cracking. Containers for agricultural chemical formulations must be validated with the actual packaged formulation at the maximum expected storage temperature. Published data for this specific configuration in high-temperature long-term field exposure is limited; laboratory ESCR values are not a substitute for end-use compatibility testing.
When Density Is Raised to Meet Top-Load Requirements
If the container must satisfy a top-load or stacking specification, the higher-density end of the series is selected. Increasing density from 0.951 g/cm³ to 0.955 g/cm³ raises flexural modulus under ASTM D790-17 from approximately 1.10 GPa to 1.30 GPa. The same density increase reduces ESCR under ASTM D1693-15 and low-temperature impact resistance under ASTM D746-14. This inverse relationship defines the main selection boundary between 9502H and 9503H. For agricultural chemical packaging with high ESCR demand, the lower-density grade is typically selected; for dry industrial containers with high stacked weight, the higher-density grade is selected.
Regulatory Compliance and Material Safety Boundaries
The unfilled resin is manufactured to comply with FDA 21 CFR 177.1520 paragraph (c) for polyolefin food-contact use, subject to end-use temperature and food-type limitations. EU food-contact compliance is typically documented under Regulation (EU) No 10/2011 through a Declaration of Compliance; migration testing with the specific food simulant and time-temperature condition is required. The grade contains no intentionally added per- or polyfluoroalkyl substances and falls below RoHS Directive 2011/65/EU maximum concentration values for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE in the unfilled natural state.
| Domain | Standard or regulation | Applicability |
|---|---|---|
| Density | ASTM D1505-18 / ISO 1183-1:2019 | Lot release |
| Melt flow | ASTM D1238-20 / ISO 1133-1:2022 | Lot release |
| Food contact | FDA 21 CFR 177.1520(c) | Unfilled natural resin |
| EU food contact | Regulation (EU) No 10/2011 | Declaration of Compliance |
| RoHS | Directive 2011/65/EU | Base resin |
| REACH | Regulation (EC) No 1907/2006 | Substance registration |
Processing above 240 °C can generate oxidation by-products such as acetaldehyde; local exhaust ventilation and melt-temperature monitoring are required for operator exposure control. Natural resin has limited ultraviolet resistance. Prolonged outdoor exposure requires a carbon black masterbatch for carbon-black addition at 2.0% to 2.5% or an approved UV stabilizer concentrate. Pre-drying is not normally required when bulk packaging is stored below 60% relative humidity; if surface condensation occurs, a desiccant drier at 70 °C for 2 h is sufficient.
