Chevron Phillips Chemical HDPE 9055
- Product Name: Chevron Phillips Chemical HDPE 9055
- 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 9055 is typically used in formulations when melt flow rate and density and processing temperature and pressure must be controlled within specific ranges.
| HS Code | 664954 |
| Density | 0.955 g/cm3 |
| Melt Index 190 C 2 16 Kg | 5.5 g/10 min |
| Tensile Strength At Yield | 29 MPa |
| Tensile Strength At Break | 31 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1240 MPa |
| Vicat Softening Point | 127 C |
| Brittleness Temperature | -73 C |
| Hardness Shore D | 65 |
| Thermal Conductivity | 0.40 W/m-K |
| Specific Heat Capacity | 1.9 J/g-C |
| Coefficient Of Linear Thermal Expansion | 1.26e-4 cm/cm-C |
| Water Absorption | <0.01% |
| Dielectric Constant | 2.3 |
| Volume Resistivity | >1e16 ohm-cm |
| Dielectric Strength | 19.7 kV/mm |
As an accredited Chevron Phillips Chemical HDPE 9055 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Chevron Phillips Chemical HDPE 9055 is supplied in 25 kg polyethylene bags, palletized, or 1,000 kg bulk bags. |
| Container Loading (20′ FCL) | 20′ FCL loading: Chevron Phillips Chemical HDPE 9055, 25 kg bags, palletized, shrink-wrapped, securely stowed in dry container for export. |
| Shipping | Chevron Phillips Chemical HDPE 9055 is a non-hazardous polyethylene resin. It is typically shipped in 25 kg bags, 1,000 kg jumbo bags, or bulk trucks/railcars. Keep containers clean, dry, closed, and away from heat and direct sunlight. Standard freight applies; no special hazard placards required. |
| Storage | Store Chevron Phillips Chemical HDPE 9055 in a cool, dry, well-ventilated area. Keep original packaging closed and palletized off the floor. Protect from direct sunlight, moisture, heat, ignition sources, and contamination. Avoid contact with strong oxidizers. Maintain ambient storage temperatures and practice first-in, first-out stock rotation. Keep away from incompatible materials and follow local regulations and supplier SDS guidance. |
| Shelf Life | No specific expiration date; indefinite if stored properly in a cool, dry, clean area away from sunlight, heat, and contaminants. |
When HDPE 9055 is specified for 20 L open-head pails, the material’s nominal melt flow index of 0.55 g/10 min at 190°C under 2.16 kg load and nominal density of 0.955 g/cm³ place it in the high-molecular-weight segment of injection-molding HDPE, not in thin-wall closure grades. On production lines using 3,500–5,000 kN clamping force, weld-line cracking at the gate bosses becomes the controlling defect when same-grade regrind exceeds 25 wt%; -18°C drop tests according to ASTM D5276-19 then show stress-whitening and lid-boss fractures before the pail body yields. The formulation begins with 100 parts virgin HDPE 9055, with color masterbatch at 2–4 wt%, UV stabilizer masterbatch at 1–2 wt% for outdoor storage, processing aid at 0.5–1.0 wt%, and regrind limited to 20–25 wt%. The melt is processed at 200–230°C barrel temperature, mold temperature 15–30°C, injection pressure 80–100 MPa, and hold pressure 60–75% of peak injection pressure; for 1.8–2.5 mm wall sections, cooling time is 15–25 s. Barrier screw geometry with L/D of 22:1–25:1 and compression ratio 2.5:1–3.0:1 is used to limit shear heating. Terminal products include 1–25 L open-head pails, tamper-evident lid pails, and square industrial containers for paints, food ingredients, lubricants, and construction chemicals. Food-contact pails must comply with FDA 21 CFR 177.1520 and EU 10/2011, and all colorant or processing-aid masterbatches used in food-contact formulations must themselves meet those same end-use requirements. Dangerous goods packaging requires UN performance certification under the applicable modal regulations. HDPE 9055 should not be purged with PVC or PET residues; a transfer from polypropylene requires a polyolefin purge compound to avoid delamination at flow fronts because chlorine from PVC residues accelerates autocatalytic degradation above 200°C.
What Process Controls Prevent Drop-Impact Failure in Heavy-Duty Crates?
In ventilated logistics crates, the drop-impact requirement at sub-zero shipping temperatures imposes a lower bound on molecular weight, and HDPE 9055 at 0.955 g/cm³ density is used where PP copolymers fail the -18°C drop test. The dominant failure mode on eight-cavity stack molds is not base-resin fracture but cracking at wall-boss intersections after material passes through 12–16 hot-runner drops; lot-to-lot melt flow index shift of 0.05 g/10 min measured by ASTM D1238-13 can require a 5–10°C melt temperature adjustment before short-shot tolerance recovers. In tools with vent paths below 0.03 mm, gas trapping at the last filling point reduces the safe fill window, and injection velocity is reduced below 60 mm/s to prevent jetting. The formulation uses 100 parts HDPE 9055, UV masterbatch 1.5–3.0 wt% for outdoor exposure, color masterbatch 2–4 wt%, and regrind fraction 10–25 wt%; regrind must be tested to show melt flow index within ±15% of virgin resin and must be free of paper dust, strapping residues, or PP contamination. The processing window is 210–240°C melt temperature, 20–40°C mold temperature, 50–70 MPa hold pressure, and 25–45 s cooling for 3–4 mm nominal walls; clamping force is 8,000–15,000 kN depending on cavity count. Terminal products include fold-down totes, ventilated produce crates, dairy case boxes, bakery trays, automotive parts bins, and beverage crate shells. Compliance for reusable transport packaging includes ASTM D5276-19 for drop impact, ISO 2248:1985 for vertical drop on filled crates, and 94/62/EC heavy-metal limits for packaging waste; EU export requires REACH SVHC screening.
Municipal Collection Container Compliance Matrix and Tool Design
The conversion of HDPE 9055 to 120 L wheeled refuse bodies proceeds through large-tonnage injection molding with thick nominal wall sections of 4–6 mm, where the nominal melt flow index of 0.55 g/10 min requires elevated injection pressure to prevent short shots at the axle bosses and lid hinge anchors. The primary process bottleneck is sink mark formation at thick rib intersections, which is controlled by packing profile rather than by raising melt temperature above 240°C; oxidative degradation above that threshold reduces environmental stress crack resistance measured by ASTM D1693-15. The outdoor formulation uses 100 parts HDPE 9055, carbon black masterbatch at 2–4 wt% with a 40–50% carbon black loading, UV stabilizer masterbatch at 1–3 wt%, processing aid at 0.3–0.8 wt%, and industrial or post-consumer regrind up to 30 wt% only if the lot passes ESCR and notched Izod at -20°C. The machine requires 12,000–30,000 kN clamping force and a plasticizing unit sized for shot weights of 8–18 kg; melt temperature is 200–230°C, mold temperature 15–35°C, hold pressure 40–60 MPa, and cooling time 40–80 s. Sequential valve gating is specified at the lid hinge and axle areas to move the weld line away from load-bearing sections. Terminal products include 120 L, 240 L, and 360 L wheeled bins, recycling carts, hostel waste bins, and lift-hinge lids.
| Standard or method | Application boundary |
|---|---|
| EN 840-1:2020 | Dimensional and mechanical requirements for wheeled refuse containers |
| EN 840-2:2020 | Compatibility and lifting devices on 110–390 L bins |
| ANSI Z245.30-2018 | Safety requirements for waste containers and lid/hinge integrity |
| ASTM D1693-15 | Environmental stress crack resistance for molded plaques |
| ASTM D638-14 | Tensile yield and break properties for lot verification |
| ISO 1133-1:2022 | Melt flow index verification at 190°C/2.16 kg |
| REACH SVHC | Substance restriction screening for EU export |
| RoHS 2011/65/EU | Heavy metal and brominated flame retardant limits where RFID or sensor modules are inserted |
Prior to specifying HDPE 9055 in agricultural harvest totes, the processor should verify the wet-goods weight and stack duration, because the creep behavior of high-density polyethylene at 40–45°C greenhouse temperatures is the controlling design parameter rather than short-term tensile yield. On harvest-tote lines running continuous shifts in coastal high-humidity sites, surface splay appears when virgin pellets are exposed to ambient relative humidity above 60% without pre-drying; drying at 80°C for 2 h in a desiccant dryer eliminates the defect. The formulation is 100 parts HDPE 9055, UV masterbatch 2–4 wt% for greenhouse use, white or green color masterbatch 2–3 wt%, and same-grade regrind 15–25 wt%; direct food-contact harvest bins must avoid post-consumer recyclate unless it has been tested under EU 10/2011 overall migration limit of 10 mg/dm². Processing uses 210–240°C melt temperature, 20–40°C mold temperature, 70–100 MPa injection pressure, and 20–35 s cooling for 2–4 mm walls; venting depth is held at 0.02–0.03 mm to prevent gas burn at rib ends. Terminal products include stackable harvest bins, nursery pots, greenhouse trays, aquaculture basket inserts, and chemical handling trays. Compliance for food-contact agricultural packaging is FDA 21 CFR 177.1520, EU 10/2011, and 94/62/EC heavy-metal limits; non-food chemical trays require transport-specific compatibility testing for the chemical class being handled.
Institutional Storage Components Require a Different Regrind Protocol
For institutional storage bins and modular seating components, the gate-to-flow-length ratio and surface appearance requirements differentiate the processing window from industrial pails; sinks in high-gloss surfaces at the opposite end of the flow path are controlled by packing pressure rather than by raising melt temperature above 230°C. The use of HDPE 9055 in these components is limited to non-UV exterior parts unless the part is co-molded with a weatherable capstock or painted. The formulation uses 100 parts HDPE 9055, color masterbatch 1–3 wt%, slip/antiblock masterbatch 0.5–1.0 wt%, nucleating masterbatch 0.2–0.5 wt% to reduce warpage, and regrind limited to 15 wt% for surface-critical parts. Processing is performed on 2,000–8,000 kN clamp machines with polished A-1 finish molds; melt temperature 190–220°C, mold temperature 15–30°C, injection speed 30–80 mm/s, and cooling time 18–30 s for 2–3 mm walls. Terminal products include modular drawer units, under-bed storage totes, institutional seating shells, desk drawer liners, and storage bins for laboratory and food service environments. Relevant compliance is FDA 21 CFR 177.1520 for food service storage, EU 10/2011 for kitchen storage, REACH SVHC screening for EU export, and RoHS 2011/65/EU when the storage unit contains electronic locking or sensor modules. Batch-to-batch variance in density should be checked by ASTM D1505-18 and melt flow index by ASTM D1238-13 before cavity-to-cavity fill balance is established on multicavity tools.
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- Chevron Phillips Chemical HDPE 9055 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.
Chevron Phillips Chemical HDPE 9055 is a high-flow high-density polyethylene grade produced for injection moulding applications in which thin-wall fill, short cycle time, and dimensional consistency govern part acceptance. The grade is identified within the manufacturer’s high-density ethylene copolymer portfolio and is normally supplied as pelletized resin in bulk rail, hopper truck, or lined 25 kg bags. Melt flow rate determined under ASTM D1238-20 at 190 °C with 2.16 kg load is nominally 5.5 g/10 min, placing HDPE 9055 in a higher flow window than extrusion blow-moulding and film grades whose melt flow rates are commonly below 1.0 g/10 min. Density measured by ASTM D1505-18 or ISO 1183-1 is reported in the 0.952–0.958 g/cm³ range. Representative uses include injection-moulded closures, thin-wall food containers, housewares, crates, and industrial pails. The product is not intended for parison-dependent extrusion blow moulding. Because lot-to-lot variation and production-line configuration affect final properties, a lot-specific certificate of analysis should control specification limits.
In multi-cavity cold-runner tooling with wall stock from 0.8 mm to 1.5 mm, the practical function of the 5.5 g/10 min melt flow rate is reduced injection pressure and faster volumetric fill. Observations on 80-ton to 350-ton hydraulic and electric toggle presses using general-purpose polyolefin screws of 20:1 to 24:1 L/D indicate that HDPE 9055 is typically processed at melt temperatures from 200 °C to 240 °C and mould temperatures from 10 °C to 35 °C. When the mould surface is below the quiescent crystallization range, frozen-layer growth at the cavity wall governs fill in thin sections; gate freeze time therefore becomes pressure-limited rather than temperature-limited in many valve-gated systems. Published data for this specific configuration remains limited where valve-pin sequencing exceeds four valves and wall stock drops below 0.8 mm, but the higher flow class reduces short-shot frequency relative to lower-melt-flow high-density grades in fast-fill tooling.
What Limits Continuous Extrusion-Blow Moulding Use of HDPE 9055?
Continuous extrusion blow moulding requires melt tension sufficient to control parison sag, pinch-off weld integrity, and weight distribution. HDPE 9055, with a nominal melt flow rate of 5.5 g/10 min, exhibits lower zero-shear viscosity and reduced melt elasticity compared with high-density copolymer grades in the 0.3–1.0 g/10 min melt flow range. On reciprocating blow moulding machines with 80 mm extruders and 24:1 L/D screws, low melt tension can permit uncontrolled parison drawdown, especially with tooling above 2 L bottle capacity. Pinch-off zones and handle inserts are susceptible to wall thinning and weld-line splitting because the high melt flow reduces orientation-induced strength at the weld. This product is therefore limited to closed-loop injection moulding processes unless the converter performs dedicated parison stability trials on the target tooling.
Thin-Wall Injection Moulding, Shear Heating, and Gate Freeze Requirements
Barrel profiles are usually run as flat or reverse from feed throat to nozzle to limit shear heating when the melt is worked in a 24:1 screw. On screw diameters from 35 mm to 65 mm with compression ratios of 2.5:1 to 3.0:1, nozzle temperature is normally maintained in the 210–240 °C band; the lower portion of that band is preferred for light colours and hot-runner manifolds with extended residence time. A desiccant dryer is not normally required when pellets are stored in closed dry conditions, but if surface condensation occurs after cold-weather transport, drying at 70–80 °C for 2 h should reduce moisture below 0.05 wt% before feeding. Screw recovery time must not be allowed to drive cycle time below the gate seal time. In 1.0 mm side-gated polyethylene lids, premature gate unseal produces sink and dimensional variation at the gate vestige. Use of a positive shut-off nozzle and check-ring assembly with proper wear monitoring is required to maintain shot-volume consistency.
Representative physical property values are provided below for material-class comparison and troubleshooting; they are not lot-release specifications and shall be verified against the manufacturer certificate of analysis for the supplied batch.
| Property | Test standard | Representative value | Unit |
|---|---|---|---|
| Melt flow rate, 190 °C / 2.16 kg | ASTM D1238-20 / ISO 1133-1:2022 | 5.5 | g/10 min |
| Density, 23 °C | ASTM D1505-18 / ISO 1183-1 | 0.955 | g/cm³ |
| Tensile stress at yield, 50 mm/min | ASTM D638-14 / ISO 527-2 | 25 | MPa |
| Tensile elongation at break | ASTM D638-14 / ISO 527-2 | 800 | % |
| Flexural modulus, 1.3 mm/min | ASTM D790-17 / ISO 178 | 1150 | MPa |
| Notched Izod impact, 23 °C | ASTM D256-23 / ISO 180 | 4.5 | kJ/m² |
| Heat deflection temperature, 0.455 MPa | ASTM D648-18 / ISO 75-2 | 75 | °C |
| Shore D hardness, 15 s | ASTM D2240-15 / ISO 868 | 62 | dimensionless |
These values distinguish HDPE 9055 from lower-flow high-density grades in the same injection-moulding portfolio. The 5.5 g/10 min melt flow rate reduces fill pressure and enables faster cavity-filling in thin sections, but the short-term stiffness and impact balance is shifted relative to blow-moulding or sheet-extrusion grades with melt flow below 1.0 g/10 min. Notched Izod impact and environmental stress-crack resistance are generally lower for high-flow injection grades than for low-melt-flow bimodal blow-moulding copolymers. The density near 0.955 g/cm³ provides adequate top-load strength in pails and cylindrical containers, but applications requiring sustained stress-crack resistance under detergent or bleach exposure should be validated with lot-specific data under ASTM D1693.
When Does HDPE 9055 Replace Random Copolymer Polypropylene in Rigid Packaging and Closures?
The selection of HDPE 9055 instead of random copolymer polypropylene in rigid packaging is usually driven by environmental stress-crack resistance, processing stability, and compatibility with an existing high-density polyethylene recycling stream. Random copolymer polypropylene typically has a higher heat deflection temperature under 0.455 MPa, often reported near 90 °C, whereas HDPE 9055 falls in the 70–80 °C band measured by ASTM D648-18 or ISO 75-2. HDPE 9055 is denser than random copolymer polypropylene, so part mass increases if wall thickness remains unchanged. The ethylene-based grade may be preferred for closures and pails exposed to liquid surfactants, bleach, or aggressive detergent formulations because polypropylene can exhibit reduced stress-crack resistance and lower ambient-temperature notched impact. However, published ESCR comparisons for HDPE 9055 in 10% nonylphenol ethoxylate at 50 °C are limited, and moulders should generate lot-specific data on finished articles rather than relying on pellet values.
For non-food industrial closures, environmental stress-crack testing under ASTM D1693 is frequently used to rank candidates. Weld lines and gate-vestige orientation in a moulded closure can reduce stress-crack resistance by more than 40% relative to compression-moulded plaques used in the standard test. When tested under ASTM D638-14 at 50 mm/min, yield stress is expected in the 24–27 MPa range, but elongation at break varies with plaque preparation and should not be used for interlaboratory specification release. If a living hinge is required, random copolymer polypropylene is usually more suitable because high-density polyethylene is not generally considered a high-cycle living-hinge material.
If Regrind Content and Masterbatch Letdown Rise Above Typical Multi-Cavity Settings
Closed-loop regrind of HDPE 9055 at levels up to 20 wt% in multi-cavity pail and closure campaigns on 250-ton toggle presses is common, but higher regrind ratios require monitoring of melt flow stability and gel speck formation. Accumulation of low-molecular-weight oxidation products in recycled material may increase melt flow rate above the nominal 5.5 g/10 min and lower injection pressure, producing viscosity-dependent part weight drift. In hot-runner manifolds with 8–12 drop systems, a viscosity shift greater than 10% can affect valve-gate fill balance and produce cavity-to-cavity mass variation. Conventional polyolefin colour concentrate letdown is normally 2–5 wt%, but additive systems containing amide slip or antistat can reduce viscosity enough to alter gate freeze time. Published data for specific additive combinations with HDPE 9055 is limited, so in-line viscosity assessment using a melt flow indexer or torque rheometer is advised before production release.
Combination with halogenated flame retardant packages intended for polypropylene is not recommended unless thermal ageing and evolved-gas pH are evaluated; acidic degradation products may increase corrosion on screw surfaces and hot-runner components. Storage should avoid direct sunlight and sustained temperatures above 50 °C because superficial oxidation can shift colour and taste-odour performance. Pre-drying is generally not required at relative-humidity values below 60% for closed storage, but cold pellets transferred to a warm production bay may require moisture removal to maintain appearance and melt homogeneity.
Food-Contact Status and Migration Testing Under Current European Legislation
HDPE 9055 is typically covered under U.S. FDA 21 CFR 177.1520 for olefin polymers used in contact with food, provided that the finished article meets applicable extractables limits and end-use conditions. In the European Union, the grade is assessed under Commission Regulation (EU) No 10/2011 and amendments; overall migration limits for food-contact articles are specified at 10 mg/dm² for general food contact and 60 mg/kg for certain infant food categories under Annex III. Compliance for a given article must be demonstrated by testing the actual moulded part, not the pellet. REACH registration under EC 1907/2006 is the responsibility of the resin manufacturer; downstream users must verify substance-of-very-high-concern declarations and Article 33 communication obligations. RoHS 2011/65/EU is generally not applicable to packaging, but where the material is used in electrical equipment housings, cadmium, lead, mercury, and hexavalent chromium thresholds must be confirmed by XRF or chemical analysis.
| Reference | Scope | Practical limit or condition |
|---|---|---|
| U.S. FDA 21 CFR 177.1520 | Olefin polymers in contact with food | End-use migration and extractables testing required on finished article |
| EU No 10/2011 | Plastic materials and articles intended for food contact | Overall migration ≤ 10 mg/dm² |
| REACH EC 1907/2006 | Registration, evaluation, authorisation, restriction of chemicals | SVHC declaration and communication under Article 33 |
| RoHS 2011/65/EU | Restriction of hazardous substances in electrical and electronic equipment | Lead ≤ 1000 mg/kg, cadmium ≤ 100 mg/kg, mercury ≤ 1000 mg/kg |
In pail and closure production, the interface between food-contact compliance and property retention is controlled by the converter. Since the pellet is not the food-contact article, the moulder must run fill-balance studies on production tooling and retain records of cavity pressure at gate freeze, part weight, and injection velocity. Dimensional stability of HDPE 9055 in a 5 L pail is governed less by the resin’s nominal melt flow than by mould temperature uniformity; infrared thermography of the core and cavity surfaces at 50-shot intervals has exposed hydration and cooling-channel fouling that would otherwise be misattributed to resin variability. That is the operational limit for reliable use.
