Chevron Phillips Chemical HDPE 9646T
- Product Name: Chevron Phillips Chemical HDPE 9646T
- 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 9646T is typically used in formulations when melt flow rate and density must be controlled within specific ranges.
| HS Code | 400121 |
| Density | 0.964 g/cm3 |
| Melt Index | 0.35 g/10 min (190 °C/2.16 kg) |
| Tensile Strength At Yield | 31 MPa |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1.30 GPa |
| Hardness Shore D | 66 |
| Vicat Softening Point | 127 °C |
| Deflection Temperature Under Load At 0 45 Mpa | 73 °C |
| Brittleness Temperature | < -70 °C |
| Environmental Stress Crack Resistance | > 1000 h |
| Water Absorption | < 0.01% |
| Thermal Conductivity | 0.44 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 cm/cm/°C |
| Melting Point | 135 °C |
As an accredited Chevron Phillips Chemical HDPE 9646T factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Chevron Phillips Chemical HDPE 9646T is supplied in 25 kg polyethylene bags, with 40 bags per 1,000 kg pallet. |
| Container Loading (20′ FCL) | 20′ FCL: 20 pallets of 25 kg bags, 20 MT net Chevron Phillips HDPE 9646T, shrink-wrapped and securely loaded. |
| Shipping | Chevron Phillips Chemical HDPE 9646T is a non-hazardous high-density polyethylene resin. It is not DOT/IMDG/IATA regulated. Ship in dry, clean trucks, railcars, or containers using sealed bags/boxes. Protect from moisture, heat, contamination, and sunlight. Maintain cool, dry storage. Avoid strong oxidizers. No special hazard labels required; follow local transport rules. |
| Storage | Store Chevron Phillips Chemical HDPE 9646T in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, and flames. Keep original containers or bags tightly closed on pallets to prevent moisture, dust, and contamination. Avoid prolonged high temperatures and contact with oxidizing agents. Follow local regulations and good industrial hygiene practices. Store away from incompatible substances. Use first-in, first-out stock rotation. |
| Shelf Life | Shelf life is typically two years when stored in original unopened packaging under cool, dry conditions, away from direct sunlight. |
High-molecular-weight hexene-copolymer HDPE 9646T is introduced into the accumulator-head extrusion blow molding sequence at melt temperatures of 190–230°C and mold temperatures of 10–20°C, where parison programming across 20–40 points redistributes wall thickness before pinch-off. For UN-certified packagings, the formulation is maintained at 100 phr virgin 9646T with 0.5–2.0 wt% color masterbatch, 0.1–0.5 wt% hindered amine light stabilizer, and 0.05–0.15 wt% antistatic concentrate where required by volatile solvent handling. The downstream process uses accumulator-head machines with screw L/D ratios of 20:1–30:1 and blow air at 0.6–0.8 MPa, producing 20 L jerricans, 200 L open-head drums, and 1,000 L IBC inner bottles. Compliance is anchored to UN DOT 49 CFR 178.509 for Packing Groups II and III, IMDG Code 6.1.3, and ADR Chapter 6.1; mechanical validation uses ASTM D1693-21 Condition B for environmental stress crack resistance, ASTM D256-23 for notched Izod impact, and ASTM D638-22 for tensile yield. On production lines with accumulator shot capacity above 30 kg, parison sag time beyond 8–12 s produces measurable bottom-wall thinning; the extrusion head temperature is reduced by 5–10°C within the specified range to raise apparent viscosity, while head pressure is kept below 35 MPa to avoid shear-induced molecular weight degradation. Pre-drying is not required below 60% RH; above 80% RH, surface moisture on regrind must be removed by drying at 70–80°C for 2–4 h to prevent bubble formation at the melt. The pinch-off weld for 200 L drums must maintain a thickness not less than 60% of nominal wall thickness because UN drop testing at -18°C concentrates stress in the tail weld.
Why does agricultural chemical packaging place environmental stress crack resistance ahead of short-term impact?
Agricultural chemical containers are subjected to long-term contact with xylene, cyclohexanone, ester-based emulsifiable concentrates, and aqueous salt formulations. In a six-layer coextrusion blow molding structure, HDPE 9646T is used as the structural and regrind carrier, with an EVOH barrier layer representing 1.5–3.0 wt% of total wall thickness, tie-layer adhesives at 1.0–2.0 wt%, and dry regrind at 25–35 wt%; carbon black concentrate is incorporated at 1.0–2.0 wt% when UV opacity and solvent resistance require additional service stability. The downstream manufacturing process is six-layer coextrusion blow molding with die temperatures of 190–220°C, layer distribution controlled by encoder-based parison programming, and post-mold fluorination at residual F2 concentrations not exceeding 0.2 vol% in nitrogen. Terminal products include 0.5 L, 1 L, 5 L, 10 L, and 20 L multilayer agchem packagings. Regulatory compliance is maintained under UN 1H1/Y1.8/250 packaging certification, EPA FIFRA 40 CFR Part 156 for pesticide container design, ASTM D1693-21 Condition B, and ASTM D543-21 for chemical compatibility. Inline fluorination is limited to the outer surface where barrier testing shows inadequate solvent permeation; excessive fluorination beyond 0.2 vol% can create surface embrittlement and loss of weld strength at the pinch-off.
| Validation domain | Standard or regulation | Applied condition or requirement |
|---|---|---|
| UN packaging certification | 49 CFR 178.509 | 1.8 m drop for PG II, 0.8 m drop for PG III, 250 kPa hydraulic pressure |
| Environmental stress crack resistance | ASTM D1693-21 | Condition B, 50°C, 10 vol% Igepal CO-630 |
| Chemical compatibility | ASTM D543-21 | 7-day immersion in xylene, cyclohexanone, 50% acetic acid |
| Pesticide container design | 40 CFR Part 156 | Child-resistant and non-refillable requirements as applicable |
Multilayer fuel tank extrusion blow molding demands interfacial viscosity matching between HDPE, tie resin, and EVOH
Six-layer coextrusion blow molding for automotive fuel tanks uses HDPE 9646T for the inner and outer HDPE layers, with EVOH at 1.5–3.0 wt%, tie resins at 1.0–2.0 wt%, regrind at 30–40 wt%, and conductive carbon black at 2.0–2.5 wt% in the outer layer where electrostatic dissipation is required. The melt streams are combined in a 6-layer spiral die at 200–230°C, and the parison is programmed across 30–50 points to compensate for corner thinning at the tank ends. Blow molding clamp force for a 60 L tank typically ranges from 1,800 kN to 3,000 kN, and mold cooling is held at 8–15°C to control warpage. Compliance includes ECE R34 Annex A for fuel tank integrity, SAE J1737 for fuel system test procedures, ASTM D256-23, ASTM D638-22, and ASTM D1693-21 for mechanical and environmental stress crack validation. Terminal products are 40 L to 80 L gasoline and diesel fuel tanks. EVOH and tie-layer regrind cannot exceed 35 wt% because barrier layer degradation produces gel defects and reduces interlayer adhesion; purging with virgin HDPE at shutdown prevents carbonized residues in the accumulator head.
| Layer position | Material | Proportion | Primary function |
|---|---|---|---|
| Inner HDPE | HDPE 9646T | 25–35 wt% | Chemical resistance and pinch-off integrity |
| Inner tie | Maleated polyethylene | 1.0–2.0 wt% | Adhesion to EVOH |
| Barrier | EVOH | 1.5–3.0 wt% | Hydrocarbon permeation resistance |
| Outer tie | Maleated polyethylene | 1.0–2.0 wt% | Adhesion to regrind layer |
| Regrind | HDPE 9646T / EVOH / tie | 30–40 wt% | Process stabilization and material reuse |
| Outer HDPE | HDPE 9646T with conductive carbon black | 20–25 wt% | Impact resistance and static dissipation |
In outdoor potable and utility-tank production, HDPE 9646T is compounded at 98.0–99.5 wt% virgin resin, 0.3–1.0 wt% UV stabilizer masterbatch, 0.2–0.5 wt% pigment, and 0.05–0.1 wt% fluoropolymer processing aid, with no plasticizer or filler addition because plasticizer migration alters tank wall stiffness and weld-line strength. The manufacturing route is large accumulator blow molding at melt temperatures of 190–220°C, mold temperatures of 8–15°C, and blow air at 0.6–0.8 MPa; parison programming is required to maintain sidewall thickness above 2.5 mm in corner regions. Terminal product types include 20 L to 100 L marine freshwater tanks, agricultural sprayer tanks, and utility water cells. In potable-water contact, the finished article is evaluated under FDA 21 CFR 177.1520(c) and NSF/ANSI/CAN 61; UV weathering is assessed by ASTM G154-23 Cycle 1 for 1,000 h where outdoor service is specified. The formed tank must not be exposed to continuous water temperatures above 60°C because long-term hydrostatic creep reduces wall compressive strength at the lower parting line.
When externally sourced regrind is introduced into blow-molded dunnage, inbound melt-flow verification must precede hopper blending
Blow-molded material-handling products from HDPE 9646T are formulated with 85–95 wt% virgin 9646T, 5–15 wt% in-house regrind, 1.0–2.0 wt% carbon black masterbatch, and 0.05–0.1 wt% processing aid; external regrind is restricted to 10 wt% unless melt-flow rate under ASTM D1238-23 and density under ASTM D792-20 are verified within ±15% of virgin lot certification. The process uses large accumulator blow molding with parison shot weights up to 30 kg, clamp force up to 6,000 kN, and mold cooling at 10–18°C; parison programming across 30–50 points is applied to maintain corner thickness above 4 mm for load-bearing ribs. Terminal products include 1,100 mm × 1,100 mm pallets, 1,500 L collapsible bins, and custom dunnage trays. Compliance is specified under ISO 8611-1:2021 for pallet load capacity, ASTM D638-22 for tensile properties, ASTM D1693-21 for environmental stress crack resistance, and ISO 1133-1:2022 for melt-mass flow rate. Regrind with a melt-flow shift greater than 25% from the virgin value causes visible parison length variation and must be excluded from closed-loop regrind return.
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- Chevron Phillips Chemical HDPE 9646T 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 9646T is a pelletized high-density polyethylene resin. The grade designation is associated with sheet extrusion and heavy-gauge thermoforming rather than injection molding or blown film. Manufacturer-published typical values include a density of 0.964 g/cm³ (ASTM D1505), a melt flow index of 0.30 g/10 min (ASTM D1238, 190 °C, 2.16 kg), a tensile yield strength of 28 MPa (ASTM D638), an elongation at break greater than 600%, and a flexural modulus of 1,517 MPa (ASTM D790). The 0.964 g/cm³ density places the material in the high-stiffness region of HDPE, while the low melt index indicates a high-viscosity melt that resists sheet sag during oven heating. The product is not positioned as a low-temperature impact grade; published brittleness temperature is below -75 °C (ASTM D746), but low-temperature ductility should be confirmed for the specific end-use condition.
| Property | Test method | Typical value |
|---|---|---|
| Density | ASTM D1505 | 0.964 g/cm³ |
| Melt flow index | ASTM D1238, 190 °C, 2.16 kg | 0.30 g/10 min |
| Tensile yield strength | ASTM D638 | 28 MPa |
| Elongation at break | ASTM D638 | >600% |
| Flexural modulus | ASTM D790 | 1,517 MPa |
| Environmental stress crack resistance | ASTM D1693, Condition B, 100% Igepal | >1,000 h |
| Brittleness temperature | ASTM D746 | < -75 °C |
| Vicat softening temperature | ASTM D1525 | 126 °C |
| Hardness | ASTM D2240 | 68 Shore D |
Applications cited in manufacturer technical literature include heavy-gauge thermoformed dunnage, material-handling trays, and formed panels used in agricultural and recreational equipment. These applications exploit the 1,517 MPa flexural modulus and high melt strength. When formed parts are loaded in compression, top-load resistance is influenced by wall thickness and corner radius rather than resin stiffness alone; top-load values are therefore not reported as resin properties. Published data for this specific configuration is limited.
Production-scale sheet extrusion of 9646T typically uses a single-screw extruder with 30:1 to 36:1 L/D and a barrier screw. A melt pump between the screen changer and the sheet die reduces output surging caused by high back pressure. Melt temperatures at the die are maintained in the range of 200 °C to 230 °C; lower temperatures can generate unpigmented surface roughness, while temperatures above 240 °C increase the risk of oxidative degradation measured as a decline in environmental stress crack resistance. Screen packs of 20/40/60 mesh are common for removing agglomerates without excessive pressure drop. Published throughput and melt pressure data for this specific grade is limited; line conditions are normally established through production trials.
What Distinguishes 9646T From Lower-Density and Higher-Flow HDPE Resins?
Compared with high-flow injection molding HDPE grades exhibiting melt indices of 20 g/10 min to 50 g/10 min, 9646T has a melt index of 0.30 g/10 min. The high melt viscosity prevents excessive sheet sag during thermoforming but makes thin-wall injection molding below 1.5 mm impractical in standard mold filling. Published mold-fill data for 9646T in injection molding is limited.
Relative to lower-density polyethylene grades near 0.945 g/cm³, the 0.964 g/cm³ density increases flexural modulus and surface hardness but reduces certain ductility and puncture parameters. Comparative capillary rheometry against other HDPE grades is not published; therefore selection must rely on melt flow index, density, and the mechanical property set cited above.
Screw Configuration Boundaries and Melt Temperature Limits in Sheet Extrusion
Single-screw extrusion of 9646T is sensitive to melt temperature uniformity. At melt temperatures below 190 °C, residual unmelts can appear as surface pimples or die lines; above 240 °C, oxidative degradation may shift color and reduce environmental stress crack resistance. Barrel profiles are normally configured with a reverse temperature gradient from feed to metering, with the metering zone held below the die temperature to limit shear heating. On a 75 mm extruder with 30:1 L/D, a gear pump is often placed between the screen changer and the sheet die to stabilize output. Actual melt pressure depends on die width and gap; typical sheet dies with 2 mm to 6 mm gaps require adapter pressures within established machine limits. Published grade-specific shear viscosity curves are limited in public literature.
During heavy-gauge thermoforming of 6.35 mm sheet, surface temperature is brought to 160 °C to 177 °C and held for uniform heat distribution. Infrared pyrometry and zoned ceramic or quartz heaters are used to avoid hot spots. Because HDPE passes through a crystalline melting range, forming must occur before recrystallization; temperature variation across the sheet is controlled within ±5 °C in production practice to reduce localized thinning at plug-contact regions. Published grade-specific sag characterization for 9646T is limited, but the low melt index indicates greater sag resistance than fractional-melt-index HDPE grades used in large-part blow molding.
When Regrind Levels Exceed 35 wt%, Plug-Assist Thermoforming Defects Become Systematically Reproducible
Reintroduction of in-house sheet skeletons and trim scrap alters the rheology of the extruded sheet. Regrind generated from 9646T retains the base density but may exhibit a measurable reduction in melt index due to chain scission or crosslinking, depending on thermal history. At regrind fractions above 35 wt%, extrusion surveys frequently record increased melt pressure fluctuation and accumulation of oxidized gels at the die lip. These defects transfer to thermoformed parts as surface dimples, pinhole clusters, and uneven wall thickness in plug-assisted draw areas. The threshold is process-dependent and must be established on the specific extrusion line; published data for 9646T regrind kinetics is limited.
Surface moisture on pellet surfaces is not an absorbed-moisture issue, but condensation from outdoor silo storage can introduce water into the feed throat. Steam splay in extruded sheet can appear when wet pellet surfaces enter the feed zone; dehumidified air purges or hopper dryers are used where uncontrolled storage is exposed to high relative humidity. Drying should be limited to temperatures below 120 °C to avoid pellet surface oxidation. Published moisture threshold data specific to 9646T is limited.
Post-formed machining and assembly operations require tooling designed for high-density polyethylene. Hole punching and routing should use sharp tools with low feed pressure to avoid white stress-whitening zones. Heat staking and ultrasonic welding are possible, but process energy must be adjusted for the high crystallinity; the exact welding parameter window is not published for 9646T.
Regulatory Verification Requirements for Food-Contact and Industrial Applications
Food-contact status for HDPE 9646T is typically evaluated under FDA 21 CFR 177.1520(c) for olefin polymers. End-use condition testing may be required for fatty foods, hot fill, or extended contact durations. Under EU No 10/2011, the grade is assessed as a polyolefin with overall migration limited to 10 mg/dm² for plastic food-contact materials; specific migration testing depends on the final article formulation and processing aids. REACH registration obligations do not apply to the polymer as such under the polymer exemption, but imported articles may require SVHC screening. RoHS Directive 2011/65/EU restricted substance classes are not expected to be present above the stated thresholds in natural, uncolored resin; color concentrates and processing aides must be evaluated separately.
| Regulation/Standard | Relevant clause/limit | Verification basis |
|---|---|---|
| FDA 21 CFR 177.1520(c) | Olefin polymers for food contact | End-use condition testing |
| EU No 10/2011 | Overall migration limit 10 mg/dm² | Final article migration testing |
| REACH | Polymer exemption | Monomer and additive registration |
| RoHS 2011/65/EU | Restricted substances | Article-level screening |
The environmental stress crack resistance value of >1,000 h (ASTM D1693, Condition B, 100% Igepal) is relevant for parts in contact with alcohols, mild acids, and some detergents. It does not ensure compatibility with aromatic solvents or chlorinated hydrocarbons. Users should perform exposure testing according to ASTM D543 or equivalent immersion standards before specifying the resin for chemical containment.
Formed parts exposed to strong oxidizing acids, certain hydrocarbons, or continuous outdoor UV without carbon black or hindered amine stabilization are outside the grade’s typical service envelope. The resin is not characterized in public literature for medical implant service or long-term load-bearing structural applications beyond the cited physical property methods. No representation is made concerning suitability for direct contact with aggressive solvents; compatibility testing under the intended transport conditions is required.
