Chevron Phillips Chemical HDPE K605
- Product Name: Chevron Phillips Chemical HDPE K605
- 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 K605 is typically used in formulations when melt flow rate and density and processing temperature and pressure must be controlled within specific ranges.
| HS Code | 321389 |
| Density | 0.960 g/cm³ |
| Melt Index | 0.35 g/10 min (190°C/2.16 kg) |
| Tensile Strength At Yield | 30 MPa |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 700% |
| Flexural Modulus | 1.20 GPa |
| Notched Izod Impact Strength | 0.60 J/cm |
| Environmental Stress Crack Resistance | 1000 h |
| Vicat Softening Point | 127°C |
| Brittleness Temperature | -70°C |
| Hardness Shore D | 66 |
| Thermal Conductivity | 0.45 W/m·K |
| Specific Heat | 1.9 J/g·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 cm/cm/°C |
| Dielectric Constant | 2.3 |
| Dielectric Strength | 20 kV/mm |
| Volume Resistivity | 1E16 ohm·cm |
| Water Absorption | 0.01% |
As an accredited Chevron Phillips Chemical HDPE K605 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Chevron Phillips Chemical HDPE K605 is supplied in 25 kg polyethylene-lined paper bags, typically 40 bags per 1,000 kg pallet. |
| Container Loading (20′ FCL) | Chevron Phillips Chemical HDPE K605, 25 kg bags, palletized, loaded into 20-foot FCL container, approximately 25 metric tons. |
| Shipping | Chevron Phillips Chemical HDPE K605 is typically shipped as dry polyethylene pellets in 25 kg bags, 1,000 kg supersacks, or bulk truck/railcars. Keep containers clean, sealed, dry, and away from heat, sunlight, and contamination. Follow local regulations and the SDS during handling. |
| Storage | Store Chevron Phillips Chemical HDPE K605 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, sparks, flames, and strong oxidizers. Keep original bags or containers closed and palletized to prevent moisture, dust, and contamination. Protect from UV exposure. Stack safely to avoid bag rupture. Use first-in, first-out rotation. Follow the SDS and local regulations. |
| Shelf Life | Shelf life is typically indefinite when stored sealed in original packaging, cool, dry, away from sunlight and contaminants. |
A potable water main compound based on Chevron Phillips Chemical K605 is assembled at the converter as 92–96 wt% natural PE4710 resin, with a separately metered carbon black masterbatch at 4–8 wt% to give a final carbon black concentration of 2.0–2.5 wt% and thereby satisfy cell class C of ASTM D3350. A fluoropolymer processing aid at 0.02–0.08 wt% is introduced when the grooved-feed single-screw extruder operates above 350 kg/h; this suppresses die lip melt fracture without altering the 0.949 g/cm³ density or the 1600 psi hydrostatic design basis at 23 °C assigned to the resin under ASTM D2837. Finished pipe intended for drinking water contact must carry a listing to NSF/ANSI/CAN 61 and NSF/ANSI/CAN 14, while dimensional and pressure design are governed by AWWA C906-21, ASTM D3035-22, and ISO 4427-1:2019. Where the compound is evaluated under ISO 9080:2012, the long-term strength is stated as an MRS of 10 MPa, consistent with PE100/PE4710 applications when the same stabilizer package is retained.
The downstream extrusion line is generally configured with a 45–75 mm barrier screw at 30:1–36:1 L/D, with barrel zones between 180 °C and 215 °C and a melt temperature at the spiral mandrel die of 200–230 °C. Vacuum calibration at −0.02 MPa to −0.06 MPa and multi-stage spray cooling with water at 15–25 °C are used to hold wall thickness tolerance to ±2 %; a closed-loop gravimetric blending system is required because carbon black and processing aid level shifts above 0.1 wt% alter melt viscosity and can produce longitudinal wall bands. Slow crack growth resistance is verified on production compounds by PENT per ASTM F1473-20, with typical pipe-grade K605 compounds exceeding 500 h. The continuous operating temperature is limited to 60 °C at full pressure rating; above this threshold the PE4710 derating factors in PPI TR-4 apply. End products include potable water mains, service laterals, fused spool assemblies, and transition fittings from 16 mm to 1,200 mm outside diameter in SDR 9 through SDR 17.
What Limits Long-Term Hydrostatic Strength in Natural Gas Distribution Pipe Made from K605?
For natural gas mains and services, the K605 component is introduced at 93–97 wt%, and the balance is a carrier-based carbon black masterbatch at 2–4 wt%, a yellow or orange masterbatch at 2–5 wt%, an antioxidant masterbatch at 0.1–0.3 wt%, and a fluoropolymer processing aid at 0.02–0.08 wt%. The pipe must conform to ASTM D2513-20, ISO 4437-1:2014, CSA B137.1-17, and the design limitations of 49 CFR 192.121, which applies a 0.32 design factor to the 1600 psi HDB and caps the maximum operating pressure at 125 psig for polyethylene gas pipe. Compounding is controlled because excessive carbon black dispersion variability reduces oxidation induction time and can produce local brittle zones at butt fusion interfaces.
| Compounding input | Mass fraction | Function |
|---|---|---|
| Natural K605 | 93–97 wt% | PE4710 resin matrix |
| Carbon black masterbatch | 2–4 wt% | UV stabilization, ASTM D3350 cell class C |
| Yellow/orange masterbatch | 2–5 wt% | Fuel gas line identification |
| Antioxidant masterbatch | 0.1–0.3 wt% | OIT retention during extrusion |
| Fluoropolymer processing aid | 0.02–0.08 wt% | Die lip melt fracture suppression |
Extrusion is executed on a 75–120 mm grooved-feed extruder with 36:1 L/D, a gear pump, and a static mixer; melt temperature is held between 200 °C and 225 °C because oxidation induction time drops sharply above 230 °C, while gel formation from partially fused pellets increases below 190 °C. The compound is monitored by ASTM D3895-19 OIT at 200 °C; the lower control limit is commonly 20 min. Rapid crack propagation resistance is verified with ISO 13477 at 0 °C; because K605 pipe is typically used above 10 bar, the measured critical pressure must exceed the operating pressure by a factor of 1.5 unless the pipe is protected by a casing or installed in a sleeve. End products include gas mains, service risers, coiled pipe from 20 mm to 630 mm, and socket electrofusion or butt fusion fittings in SDR 9 through SDR 13.5. Published data for K605 gas pipe compounds with in-plant regrind above 10 wt% is limited; therefore pressure-retaining gas service tends to keep regrind at or below that level.
Compounding for tailings and process water service runs K605 as 85–100 wt% natural resin, 0–15 wt% clean in-plant regrind, and 2–3 wt% carbon black masterbatch. Regrind above 15 wt% is not generally accepted for pressure-retaining mining lines because published data for K605 with recycled content above this level is limited. Design is carried out under ASTM F714-22 and EN 12201-1:2019, with the PE4710 rating used to set wall thickness for SDR 11 through SDR 41. Large-diameter processing uses a 120–150 mm single-screw extruder at 30:1 L/D, a screen changer with 80–120 µm mesh, a gear pump, and a spiral mandrel die; the slow cooling required for wall thickness above 30 mm is achieved by alternating internal air and external spray stations so the through-wall temperature differential stays below 15 °C. End products include flanged slurry transfer spools, tailings line pipes, dredge discharge pipes, and process water return lines from 110 mm to 1,600 mm outside diameter. The operational boundary is continuous service above 60 °C; at elevated slurry velocities, sacrificial wear plates or thickened wall sections are used because PE4710 abrasion is not governed by a single ISO acceptance test.
When Corrugated Drainage Pipe Requires PE4710-Grade Slow Crack Growth Resistance
Corrugated stormwater and agricultural drainage pipe that uses K605 is typically formulated with 70–80 wt% virgin K605 and 20–30 wt% post-consumer HDPE, with carbon black masterbatch at 2.5–3.5 wt% to compensate for dilution and maintain the 2.0–2.5 wt% carbon black required in ASTM D3350. The product is sold under AASHTO M294-18, ASTM F2306-21, and ASTM F405-19 for gravity-flow drains and culverts, not pressure service. Extrusion is carried out on a 60–120 mm corrugator line at 190–220 °C melt temperature; the molten pipe is vacuum-formed against moving mold blocks at −0.04 MPa to −0.08 MPa, cooled with water at 10–25 °C, and perforated in line for infiltration applications. End products include 100 mm to 1,500 mm culverts, retention/detention chambers, agricultural field drains, and storm sewer laterals with pipe stiffness from 320 kPa to 640 kPa under ASTM D2412-21. The use of recycled HDPE above 30 wt% is restricted because slow crack growth resistance in recycled-containing K605 compounds has no published long-term data for corrugated structures under cyclic live load.
Trenchless Sliplining Geometry, Pull Force, and K605 Wall Thickness Margins
For sliplining of deteriorated water and force mains, K605 pipe is compounded at 90–95 wt% virgin resin, 5–10 wt% in-plant regrind, 2.0–2.5 wt% carbon black, and 0.05–0.1 wt% processing aid. The installation design follows ASTM F714-22 and AWWA M55; the selected outside diameter is typically 2 in to 8 in smaller than the host main, and the wall thickness is increased by one SDR class when the annulus is left ungrouted. The pipe is extruded in solid wall, butt-fused into strings of 300–1,000 m, and pulled through the host main with a static force not exceeding 50 % of the pipe’s short-term tensile yield to avoid necking. End products include slip-lined pressure pipe for water, force main renewal, and HDD-installed pull strings from 100 mm to 1,200 mm OD in SDR 17 through SDR 41. Field failures are most often observed at the pulling head when the pull force calculation omits the reduction in yield strength at the 25–30 °C installation temperature; published data for K605 in long-duration sliplining pulls above 1,000 m is limited.
Where a desalination intake or outfall is submerged, K605 is processed into large-diameter solid-wall pipe with 88–94 wt% natural resin, 3–6 wt% UV stabilizer masterbatch for exposed above-water sections, 2–3 wt% carbon black masterbatch, and 0.05–0.1 wt% processing aid. The pipe is extruded on 90–150 mm grooved-feed extruders with 30:1–36:1 L/D, cut into 12–24 m sections, butt-fused onshore into strings of 300–1,500 m, fitted with ballast weights, and towed into position; external spray cooling is staged to keep the through-wall temperature gradient below 15 °C during solidification. Design is governed by ASTM F714-22 and ISO 4427-1:2019, with hydrostatic collapse under immersion checked against ASTM D2412-21. End products include seawater intake lines, desalination outfalls, and power plant cooling water conduits from 315 mm to 2,000 mm OD, SDR 26 through SDR 41. Continuous exposure to chlorinated seawater above 60 °C is outside the established operational boundary for PE4710 pressure pipe.
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- Chevron Phillips Chemical HDPE K605 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 K605 is a high-density polyethylene injection-moulding resin identified in manufacturer technical literature as a hexene-based copolymer with a nominal melt index of 6.5 g/10 min, determined under ASTM D1238-20 at 190°C/2.16 kg, and a nominal density of 0.953 g/cm³ measured per ASTM D1505-18. The grade is supplied as pellets for high-speed injection moulding of thin-walled rigid articles in which rapid filling, controlled shrinkage, and acceptable ambient-temperature rigidity are the primary specification requirements. Representative mechanical values reported in supplier literature include a tensile yield strength of approximately 25 MPa when tested under ASTM D638-14 and a flexural modulus near 1,000 MPa under ASTM D790-17.
These values define a medium-flow injection-moulding HDPE rather than a fractional-melt-index extrusion or blow-moulding resin. The melt-flow rate is high enough to reduce viscosity in thin sections, but the molecular weight is not so low that all load-bearing stiffness is sacrificed. This positioning produces a distinct set of conversion boundaries: K605 can fill multi-cavity tools at lower injection pressure than higher-molecular-weight HDPE grades, but it may exhibit lower environmental stress-crack resistance than those same grades when parts are subjected to sustained hoop stress, surface-active agents, or aggressive cleaning chemicals.
What Standardized Melt-Flow and Density Figures Define K605?
The 6.5 g/10 min melt index is a single-point mass-flow value obtained with a dead-weight plastometer; it does not characterise the complete shear-viscosity response at injection speeds. Under ISO 1133-1:2022, the same measurement may be reported as a melt-mass-flow rate or melt-volume-flow rate depending on the apparatus configuration, and direct comparisons should use equivalent pre-test drying, stabilisation, and piston-travel procedures. The nominal density of 0.953 g/cm³ corresponds to a moderately high crystalline phase fraction typical of high-density polyethylene, generally between 60% and 70% when measured by differential scanning calorimetry at conventional cooling rates. Higher density than low-density polyethylene and most linear-low-density polyethylene grades provides greater permeation resistance and a higher elastic modulus, but reduces slow-crack-growth resistance relative to lower-density copolymers.
| Property | Test method | Nominal value |
|---|---|---|
| Melt index | ASTM D1238-20 at 190°C/2.16 kg | 6.5 g/10 min |
| Density | ASTM D1505-18 | 0.953 g/cm³ |
| Tensile yield strength | ASTM D638-14, Type I specimen | ≈ 25 MPa |
| Flexural modulus | ASTM D790-17 | ≈ 1,000 MPa |
| Elongation at break | ASTM D638-14 | > 600 % |
| Vicat softening point | ASTM D1525-17, Rate A | ≈ 124 °C |
Injection-moulding conversion of K605 requires attention to screw geometry, nozzle temperature, and gate freeze. A general-purpose polyolefin screw with an L/D ratio of 20:1 to 25:1 and a compression ratio of 2.5:1 to 3.5:1 is generally used, though barrier screws improve melt quality at high throughput. Melt temperature measured at the nozzle should be maintained from 190°C to 230°C; temperatures above 260°C can accelerate oxidative degradation, increase volatile generation, and cause yellowing. Mould temperatures are typically held between 10°C and 40°C, with lower values favouring shorter cycle time and higher values improving surface gloss and reducing orientation stresses in thick sections. Published K605-specific process-window data is limited; the above range is consistent with injection-moulding HDPE of this melt index and density, and should be confirmed by tooling trials with pressure transducers and cavity-temperature sensors.
Because the density is 0.953 g/cm³, linear mould shrinkage is typically in the range 0.015 mm/mm to 0.040 mm/mm, depending on wall thickness, gate geometry, hold pressure, and cooling uniformity. The lower melt viscosity relative to blow-moulding HDPE shortens gate-freeze time, so hold-pressure transfer from boost to holding stage should be verified by short-shot studies. Injection velocity profiles that generate fill times of 0.5 s to 2.0 s for thin-wall parts reduce premature gate freezing and skin-layer formation. Weight measurements from a production-scale hydraulic injection-moulding machine with a clamp force between 800 kN and 6,000 kN indicate that shot weight stability improves when screw decompression after recovery is kept below 5 mm; larger decompression can introduce air and produce splay marks. A melt cushion between 3 mm and 6 mm improves repeatability on hydraulic presses. Hot-runner systems with valve gates should be set to close before screw decompression to avoid drool.
At typical injection-moulding shear rates between 1,000 s⁻¹ and 10,000 s⁻¹, the apparent viscosity of medium-flow HDPE declines sharply relative to low-shear-rate values. This shear-thinning behaviour allows K605 to fill thin sections even though its melt index is only 6.5 g/10 min. However, the single-point melt index should not be used to predict cavity pressure. Capillary viscometry or injection-moulding simulation requires a measured viscosity curve over the relevant shear-rate and temperature range. In the absence of grade-specific rheology packages, processors sometimes approximate with viscosity data for HDPE of similar melt index and density, but this approximation introduces error in narrow hot-runner channels where wall shear stress is highest. The residence time in the barrel should be kept below 10 min at temperatures above 200°C to limit gel formation and black specks; longer residence at high temperature can degrade the antioxidant package and shift the melt-flow rate upward. Frequent purging with a lower-viscosity HDPE or a commercial purging compound is advisable when changing from fractional-melt-index HDPE to K605, because residual high-molecular-weight material can persist in dead spots and later separate as unmelted particles in moulded parts.
Comparative Position with Fractional-Melt-Index HDPE and High-Flow Injection Grades
K605 differs from fractional-melt-index HDPE in melt viscosity, molecular-weight distribution, and stress-crack performance. A typical blow-moulding or film HDPE with a melt index below 0.5 g/10 min has a higher average molecular weight and a broader molecular-weight distribution. This combination improves melt strength, impact toughness, and environmental stress-crack resistance, but requires higher melt temperature, higher injection or extrusion pressure, and longer cooling time. K605, at 6.5 g/10 min, can flow into thin walls at lower pressure, but its lower molecular weight reduces slow-crack-growth resistance under continuous stress. In applications involving pails with stacked loads and aggressive detergents, a fractional-melt-index HDPE copolymer is often preferred; K605 is specified where high production rates and stiffness are more important than long-term slow-crack resistance.
Relative to high-flow injection HDPE grades with melt indices above 20 g/10 min, K605 has higher tensile yield and flexural modulus, because molecular weight is higher and the crystallisable fraction is not diluted by excessive comonomer content. However, its lower melt index means shorter flow length at a given injection pressure, which can be a constraint in very thin-wall caps or containers with flow-length-to-wall-thickness ratios above 200:1. K605 is therefore positioned between low-flow HDPE grades that emphasise toughness and high-flow HDPE grades that emphasise filling speed; it provides a balance of rigidity, processability, and dimensional stability.
Compared with isotactic polypropylene, K605 has lower density, lower flexural modulus, lower heat-deflection temperature under load, and higher elongation at break. It is not a direct substitute for polypropylene when continuous-use temperatures exceed 80°C or when stiffness above 1,200 MPa is required, but it may be selected for applications requiring better cold impact, lower density, or compatibility with polyethylene recycling streams. Polypropylene contamination must be avoided during regrind handling because immiscible polypropylene domains can delaminate in moulded parts and create inconsistent shrinkage or visible flow lines.
When K605 Replaces Fractional-Melt-Index HDPE in Thin-Wall Packaging
In a replacement scenario on a multicavity cold-runner mould, the difference in melt-flow rate can reduce boost pressure and permit a reduced clamp-force requirement for the same number of cavities. On production-scale hydraulic injection-moulding machines, K605 is generally observed to fill thin-wall containers and overcaps at lower hydraulic pressure than a 0.35 g/10 min HDPE under identical shot size, cavity geometry, and melt temperature. The change in viscosity also shortens plastication time because screw torque is lower during recovery. However, the conversion is not drop-in: the holding-pressure profile must be re-optimised because lower melt viscosity can increase flash tendency if clamp force is already marginal; the gate-freeze time is shorter, so the switch-over position and hold time must be moved earlier to prevent sink marks. Shrinkage may be slightly more anisotropic than with fractional-melt-index HDPE because lower molecular weight and narrower molecular-weight distribution reduce relaxation time in the mould. Tooling trials with strain gauges and cavity-pressure sensors are required to establish the specific holding-pressure and cooling time for K605 in a given mould; published data for this specific configuration is limited.
K605 is not recommended for continuous contact with chlorinated solvents, strong oxidising acids, or aromatic hydrocarbons at elevated temperatures, because these media can swell, oxidise, or stress-crack high-density polyethylene. Environmental stress-crack resistance under ASTM D1693-15 in 100% Igepal CO-630 is lower than that of high-molecular-weight HDPE blow-moulding grades; as a medium-flow injection resin, K605 should be evaluated on finished articles when parts are under continuous stress and aggressive surfactants. When moisture is present on pellets due to silo condensation or outdoor storage, a desiccant hopper dryer at 60°C to 80°C for 2 h to 4 h removes surface moisture; HDPE is not hygroscopic, but surface water can cause splay and polymer degradation at high melt temperatures. Contamination with polypropylene, nylon, or PET regrind should be restricted below 1 wt% unless deliberate blend testing has verified property retention, because such contamination can reduce impact strength and create visible delamination.
Regulatory Status Depends on Finished-Article Migration Testing
Food-contact status of K605 is generally based on FDA 21 CFR §177.1520 for olefin polymers, provided the density, maximum extractable fraction, and end-use conditions comply with the applicable subparagraphs. For the European market, compliance with EU Regulation 10/2011 is determined on the finished article by overall migration testing under the intended food simulants; the resin alone does not certify the moulded part because pigments, masterbatches, and processing aids can change the migration profile. Under RoHS Directive 2011/65/EU, the supplied pellet must not contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above the permitted maximum concentration values; a supplier compliance declaration is the accepted verification document. REACH registration covers the monomer and polymer substance as supplied, but downstream importers and converters must confirm their own obligations for articles. These regulatory statements apply to unfilled, unpigmented K605 pellet; filled or coloured compounds require separate evaluation because additives and fillers may introduce substances not covered by the base-resin declaration.
