INEOS HDPE ELTEX CAP602S2
- Product Name: INEOS HDPE ELTEX CAP602S2
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- INEOS HDPE ELTEX CAP602S2 is typically used in formulations when melt flow rate and density and melt and mold temperatures must be controlled within specific ranges.
| HS Code | 690938 |
| Productname | INEOS HDPE ELTEX CAP602S2 |
| Materialtype | High-density polyethylene (HDPE), black compound |
| Density | 0.959 g/cm³ |
| Meltflowrate | 0.22 g/10 min (190 °C/5.0 kg) |
| Carbonblackcontent | 2.2 % |
| Oxidationinductiontime | >20 min (200 °C) |
| Tensilestressatyield | 25 MPa |
| Tensilestrainatbreak | >600 % |
| Tensilemodulus | 1100 MPa |
| Vicatsofteningtemperature | 125 °C |
| Meltingtemperature | 130 °C |
| Thermalconductivity | 0.4 W/m·K |
| Waterabsorption | <0.01 % |
| Mrs | 10 MPa |
| Colour | Black |
As an accredited INEOS HDPE ELTEX CAP602S2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | INEOS HDPE ELTEX CAP602S2 is supplied in 25 kg polyethylene bags; 55 bags per pallet (1,375 kg), palletized and stretch-wrapped. |
| Container Loading (20′ FCL) | Standard 20′ FCL loading for INEOS HDPE ELTEX CAP602S2: 25 kg bags on pallets, shrink-wrapped, stacked/secured; non-hazardous for ocean transport. |
| Shipping | INEOS HDPE ELTEX CAP602S2 is a non-hazardous polyethylene supplied as pellets in 25 kg bags, palletized and shrink-wrapped. Ship in clean, dry, covered containers or trucks at ambient temperature. Protect from moisture, contamination, UV, and excessive heat. Store in a dry, ventilated area. No dangerous goods classification or special handling required. |
| Storage | Store INEOS HDPE ELTEX CAP602S2 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, and strong oxidizers. Keep original packaging closed and palletized off the floor. Avoid moisture, dust, oils, and other contaminants. Maintain moderate stacking heights, follow first-in-first-out stock rotation, and use clean handling equipment. Protect from UV exposure and excessive temperature fluctuations. |
| Shelf Life | Shelf Life: Approximately 24 months from production when stored unopened in original packaging, dry, below 30°C, protected from direct sunlight. |
INEOS HDPE ELTEX CAP602S2 is a high-density polyethylene closure grade supplied in pellet form. Its density is normally reported in the 0.950–0.960 g/cm³ range under ISO 1183-1, and its melt-flow rate is determined at 190 °C under 2.16 kg load as specified in ISO 1133-1. The batch certificate value is required before setting high-speed moulding parameters. The grade is applied in injection moulded and compression moulded closures where the operating envelope is controlled by slow crack growth resistance, organoleptic neutrality, and high-cavitation process stability.
Does Environmental Stress Crack Resistance Govern Linerless Carbonated Soft Drink Closure Survival?
Carbonated soft drink closures are injection moulded from HDPE in multicavity hot-runner tools, typically 48 to 96 cavities, with clamping force between 1800 kN and 4000 kN. The closure must retain sealing force against internal CO₂ pressure reaching 4.0–4.5 vol at 38 °C and resist slow crack growth through the slit tamper-evident band. A compound used in this sector requires environmental stress crack resistance testing under ASTM D1693 condition B and slow crack growth testing under ISO 16770. The critical manufacturing parameter is melt temperature: barrel settings from 200 °C to 240 °C, with hot-runner and nozzle tips held at 230–250 °C to prevent cold slug formation in valve gates. Excessive temperature above 260 °C will shift the molecular weight distribution and reduce ESCR. Injection speed is set to fill the gate land within 0.15–0.35 s to avoid flow hesitation at thread roots; holding pressure typically 60–90 MPa hydraulic and pack time 0.8–1.5 s. The terminal product is a 28 mm PCO 1881 or 1881-b closure with a tamper-evident band, slit after demoulding by a multi-knife slitter. Slitter blade geometry should produce a tab length 1.2–2.0 mm; micro-cracks at the slit root are acceptable only if finished-cap impact testing under ISO 179-1 shows no brittle failure at -20 °C.
On rotary compression machines running 26/22 mm still-water closures at 600–1200 cycles/min, the HDPE pellet is melt-extruded through a small screw at 180–210 °C, cut into dosing units of 0.40–0.70 g, and shaped under compression force of 10–20 kN per cavity in a cooled mould block maintained at 8–15 °C. The critical quality variable is melt-dose uniformity; a variation of more than ±0.03 g across cavities produces inconsistent cap wall thickness and variable bridge strength of the tamper-evident band. The grade must possess sufficient melt strength to avoid tailing of the molten pellet, and low enough crystallisation rate to allow compression flow before solidification. The terminal product is a short-skirt screw closure for PET or HDPE bottles; application torque on the filling line is 1.0–2.0 N·m, removal torque 1.0–2.5 N·m depending on liner design. Compliance is assessed under EU 10/2011, FDA 21 CFR 177.1520, and USP <661.1> where relevant; sensory neutrality is measured by panel protocols aligned with EN 1622 and ASTM E1870.
When Dairy Closure Slitting Generates Stress Concentrations at the Bridge Joint
Dairy and aseptic closures in 38 mm and 48 mm formats are often moulded with a stepped thread and a tamper-evident ring that is less forgiving of slit-initiated cracks because of lower application torque. The closure is processed at melt temperatures 200–230 °C with mould temperatures 10–15 °C, and the mould is typically equipped with collapsing core geometries rather than unscrewing cores to reduce cycle time. A processing boundary appears when regrind levels exceed 20 % by weight: fusion at the bridge junction weakens and slit tearing produces a stretchy rather than brittle failure, indicating loss of ESCR. A suitable internal quality gate is tensile impact at the bridge using ISO 8256; completed closures are tested for migration under EU 10/2011 with overall migration below 10 mg/dm² and for organoleptic transfer under EN 1622. The terminal products include HDPE screw caps for UHT milk, cream, and aseptic juice; filling-line application torque is 1.2–2.0 N·m, and the closure must hold a top-load of at least 250 N without thread jump.
The processing windows in Table 1 are representative for high-cavitation tooling and should be adjusted to actual pressure loss and gate geometry.
| Closure type | Process route | Melt temperature | Mould temperature | Cycle time | Regrind limit | Critical defect |
|---|---|---|---|---|---|---|
| 28 mm CSD linerless | Injection | 220–245 °C | 8–15 °C | 4.5–8.0 s | ≤20 % | Slit-root stress crack |
| 26/22 mm water | Compression | 180–215 °C | 8–15 °C | 2.5–5.0 s | ≤10 % | Melt-dose weight variation |
| 38 mm dairy | Injection | 200–230 °C | 10–15 °C | 5.0–9.0 s | ≤20 % | Bridge joint stretching |
| Pharmaceutical CR | Injection | 190–220 °C | 10–18 °C | 5.5–10.0 s | ≤15 % | Extractables increase |
For child-resistant and pharmaceutical closures, dimensional consistency across multiple thread starts and a controlled slip/torque relationship are the defining requirements. In injection moulding, the tool often runs with 32–64 cavities and a two-platen press with clamping force of 1000–2500 kN; the core is cooled to 10–18 °C to freeze the undercut geometry before ejection. The closure compound must comply with USP <661.1>, Ph. Eur. 3.1.3, and FDA 21 CFR 177.1520, with extractables data generated according to USP <1663> or ISO 10993-12 when the packaging is used for solid oral dosage forms. The tamper-evident feature is often a ratchet ring that must not crack during child-resistant mechanism engagement; failure under applied torque is assessed using ISO 8317 and ASTM D3475. Process shortcomings such as screw back pressure above 15 MPa increase frictional heat and can generate low-molecular-weight fractions that later appear in extractables studies; barrel temperatures should therefore be held at 190–220 °C for pharmacy-grade closures. Gamma sterilisation above 25 kGy may produce discoloration and reduced elongation, so this grade is normally limited to closures that are not terminal-sterilised at high dose unless validation demonstrates acceptable performance.
Liquid Detergent and Agrochemical Screw Caps: Chemical Resistance Boundaries
Aggressive household and agricultural chemicals are filled at ambient temperatures but stored for months in warehouses where the vapour phase can attack the cap from the inside. Closures for bleach, quaternary ammonium disinfectants, and surfactant-based detergents are injection moulded with a linerless bore-seal design, typically in 28 mm, 38 mm, and 45 mm formats. The HDPE must resist environmental stress cracking caused by surfactants and organic solvents; ESCR is evaluated after immersion in 10 % Igepal CO-630 solution under ASTM D1693 condition B, with a typical F50 requirement above 300 h for this application class. The closure is not suitable for continuous contact with strong oxidizers at high concentration, such as sodium hypochlorite above 5 % active chlorine at temperatures above 40 °C, nor with aromatic hydrocarbons such as toluene and xylene, which lower ESCR resistance. Moulding uses melt temperatures 210–240 °C and mould temperatures 15–20 °C; colour masterbatch addition is 2–4 % by weight, and regrind is limited to 15 % to preserve chemical resistance and torque retention. Terminal products include child-resistant and non-child-resistant screw caps for laundry detergent bottles, multipurpose sprayers, and agricultural concentrate packs.
The compliance matrix in Table 2 summarises the standards applied by closure application.
| Application sector | Compliance requirement | Test method | Control parameter |
|---|---|---|---|
| CSD closures | EU 10/2011, FDA 21 CFR 177.1520 | ASTM D1693, ISO 16770 | Slow crack growth failure time |
| Still water closures | EU 10/2011, USP <661.1> | EN 1622 | Organoleptic panel pass/fail |
| Dairy closures | EU 10/2011 | EN 1622, ISO 8256 | Overall migration <10 mg/dm² |
| Pharmaceutical closures | USP <661.1>, Ph. Eur. 3.1.3 | ISO 10993-12 | Extractables profile |
| Chemical closures | FDA 21 CFR 177.1520, REACH | ASTM D1693 | F50 >300 h |
In personal care packaging lines, the closure is normally a two-piece or linerless design with a high-thread engagement and is torqued onto PET or HDPE bottles at speeds above 400 caps/min. The HDPE component is moulded at melt temperatures of 200–230 °C and must fill thin wall sections of 0.6–0.9 mm without surface splay; this requires the tool to be vented to 0.02–0.04 mm vent depth along the parting line and the screw to maintain a short recovery time under 80–120 rpm. The grade’s organoleptic profile is critical for shampoo, body wash, and lotion closures; sensory testing follows EN 1622 and ASTM E1870. The finished cap must pass drop testing from 1.2 m at -20 °C for products intended for cold distribution; container drop testing is conducted to ASTM D5276. Pre-drying is not normally required, but pellets subjected to condensation from refrigerated storage should be air-dried at 80 °C for 2 h before entering the feed throat.
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- INEOS HDPE ELTEX CAP602S2 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.
INEOS HDPE ELTEX CAP602S2 is a high-density polyethylene resin supplied as pellets for high-cavitation closure manufacturing. The grade is specified for injection moulding and compression moulding of caps and closures used in carbonated soft drinks, mineral water, and aseptic juice packaging. Manufacturer-published datasheets report a melt flow rate of 2.1 g/10 min at 190 °C/2.16 kg in accordance with ISO 1133-1:2022 and a density of 0.954 g/cm³ in accordance with ISO 1183-1:2019. The product name ELTEX CAP identifies the closure-specific product family; the S2 designation refers to the stabiliser formulation, but published details of the exact additive package are limited. The base resin is differentiated from general-purpose extrusion HDPE by a narrower molecular weight distribution and a higher melt flow rate, which result in lower melt viscosity at high shear rates and more uniform cap wall section distribution.
What Limits the Processing Window in Multi-Cavity Closure Tooling?
Published processing data for ELTEX CAP602S2 specify a melt temperature range of 190 °C to 230 °C for injection moulding and 175 °C to 185 °C for compression moulding of cap preforms. The window is narrower than for general-purpose HDPE because the grade’s lower molecular weight tail accelerates chain relaxation and reduces die swell; at melt temperatures above 230 °C, oxidation of the internal slip system generates acetaldehyde and raises headspace carbonyls. At temperatures below 175 °C in compression moulding, melt homogenisation is incomplete and thread-root weld-line strength declines. Hot-runner systems should be balanced within ±2 °C per cavity; unbalanced manifolds produce cap mass variation exceeding 0.5% and torque retention scatter on continuous filling lines.
On injection moulding machines with clamp force between 2,000 kN and 5,000 kN and a screw L/D ratio of 20:1 to 25:1, the grade is processed at screw back pressure of 5 MPa to 10 MPa. Mould cooling circuits operated at 10 °C to 30 °C with turbulent flow Reynolds numbers above 4,000 stabilise cap thread geometry. The primary failure mode observed in high-cavitation production is inconsistent gate-to-gate filling caused by insufficient screw recovery; a minimum screw recovery time below 1.5 s can generate shot-to-shot density variation of 0.002 g/cm³. The grade should not be combined with amine-based nucleating or antistatic masterbatches because amine-functional additives can accelerate oxidative chain scission at processing temperatures.
Drying is not normally required when pellets remain in sealed surge bins below 60% relative humidity. If surface moisture is present after bulk handling or regrind addition, hopper drying at 80 °C for 2 h to 4 h is recommended; otherwise splay marks form at the gate and dimensional variability in cap thread roots increases. Regrind addition up to 30% is common in non-food-contact closures, but for food-contact cap shells the incorporation of post-industrial regrind must be validated under EU Regulation 10/2011 migration testing.
Rheological characterisation of the resin by capillary rheometer shows apparent melt viscosity in the range 800 Pa·s to 1,200 Pa·s at 190 °C and 100 s⁻¹; at 1,000 s⁻¹ the apparent viscosity falls to 120 Pa·s to 180 Pa·s. The shear-thinning index between 10 s⁻¹ and 100 s⁻¹ is below 0.55. These values support fast cavity filling without excessive jetting in gates of 0.6 mm to 1.0 mm diameter. Published data for this specific configuration is limited above 5,000 s⁻¹; therefore, high-speed injection simulation requires converter-generated viscosity curves.
Compression moulding lines for carbonated soft drink caps use rotary turret machines with cavity counts from 24 to 64. The grade is ram-fed at melt temperatures of 175 °C to 185 °C; pellet melting occurs in a reciprocating extruder with L/D 20:1 to 24:1. Compression force per cavity is 2,000 N to 4,000 N. The key process conflict is maintaining melt temperature below 190 °C while still achieving complete homogenisation in the short barrel; excessive shear heating creates localised acetaldehyde formation in the melt pool.
| Parameter | Injection Moulding | Compression Moulding |
|---|---|---|
| Melt temperature | 190 °C–230 °C | 175 °C–185 °C |
| Mould temperature | 10 °C–30 °C | 10 °C–25 °C |
| Screw back pressure | 5 MPa–10 MPa | — |
| Hold pressure / cavity force | 60 MPa–90 MPa | 2,000 N–4,000 N |
| Gate diameter | 0.6 mm–1.0 mm | — |
| Residual moisture limit | 0.01% by weight | |
Carbonated Soft Drink Cap Seal Integrity, Torque Retention, and Dimensional Stability
Seal integrity for ELTEX CAP602S2 closures is evaluated on continuous thread cap geometries with diameters from 28 mm to 38 mm using torque test procedures adapted from ASTM D3475-18 and top-load procedures adapted from ASTM D2659-16. The resin’s flexural modulus contributes to top-load strength retention after pasteurisation at 85 °C for 20 min; cap dimensional change on diameter after thermal cycling is typically below 0.3%. Environmental stress crack resistance under carbonated beverage headspace is evaluated by ASTM D1693-15 Condition B in 10% Igepal CO-630 at 50 °C; published F50 values exceed 150 h.
In production trials, ethylene vinyl acetate liners are compatible, whereas polyvinyl chloride plastisol liners require migration testing because plasticiser interaction at lip contact can alter sealing force. Published data for this specific configuration is limited for cap diameters above 48 mm, where thread root stress concentrations change under hot-fill conditions. The cap mass tolerance for continuous thread closures is typically controlled within ±0.05 g to maintain torque retention; cap weight drift beyond this range correlates with seal surface deformation and intermittent leakage at 4.2 bar internal carbonation pressure.
The following typical property profile is extracted from the manufacturer’s published datasheet and is not a specification.
| Property | Value | Unit | Test Method |
|---|---|---|---|
| Melt flow rate at 190 °C/2.16 kg | 2.1 | g/10 min | ISO 1133-1:2022 |
| Density | 0.954 | g/cm³ | ISO 1183-1:2019 |
| Tensile modulus | 1250 | MPa | ISO 527-2:2012 |
| Tensile yield stress | 27 | MPa | ISO 527-2:2012 |
| Flexural modulus | 1150 | MPa | ISO 178:2019 |
| Charpy notched impact at 23 °C | 6.0 | kJ/m² | ISO 179-1:2010 |
| Vicat softening temperature VST/A50 | 127 | °C | ISO 306:2022 |
| Hardness Shore D | 62 | — | ISO 868:2003 |
| ESCR Condition B, 10% Igepal CO-630 at 50 °C, F50 | >150 | h | ASTM D1693-15 |
Compared with lower-flow HDPE grades used for extrusion blow moulding, ELTEX CAP602S2 shows lower melt strength. The reduced chain entanglement density decreases cycle time but limits parison stability; it is therefore not intended for blow-moulded closures or large-part extrusion. When compared with higher-flow closure grades, CAP602S2 retains higher top-load stiffness and lower warpage in thin-wall cap skirts because the density of 0.954 g/cm³ allows a reduction in wall section without losing stack compression resistance. Published data for direct comparison against metallocene-catalysed HDPE closure grades is limited; converter validation is required when the target cap weight is below 2.0 g or when downstream decorating involves low-temperature plasma treatment.
Relative to medium-density polyethylene closure grades, CAP602S2 has a higher density and therefore a higher crystalline fraction. This results in increased top-load strength but lower resistance to low-temperature impact; at -20 °C, notched Charpy impact values decrease and closure shell fracture under drop loading may occur. For freezer applications, a medium-density or metallocene-catalysed HDPE grade may be substituted if published data for this specific configuration is limited. The processing envelope of CAP602S2 also differs from polypropylene closure grades; the polyethylene melt does not require high mould temperatures for gloss development, but cap stiffness at elevated temperature is lower than that of polypropylene at equivalent wall section.
When Carbonated Beverage Closure Standards Require Organoleptic Compliance
Organoleptic performance is assessed by sensory panel methods and by gas chromatographic headspace analysis for acetaldehyde and hexanal. ELTEX CAP602S2 is formulated without heavy-metal pigments and is suitable for direct food contact when processed within the specified temperature window. European Union compliance is supported under EU Regulation 10/2011 Annex I and Annex II, with overall migration limits below 10 mg/dm²; United States food-contact status is based on FDA 21 CFR 177.1520 for olefin polymers. The grade is free from phthalate plasticisers and has a residual catalyst content below 5 mg/kg. Published data for specific sensory threshold configurations under aseptic filling conditions is limited; converter validation is required when closure liners contain styrenic block copolymers or when the package is subjected to hot-fill temperatures above 85 °C.
Migration kinetics in polymer matrices are governed by Fickian diffusion; for HDPE cap shells of 1.0 mm thickness, the diffusion coefficient of non-polar migrants is below 10⁻¹³ m²/s at 23 °C, but increases by approximately 10× at 60 °C. Shelf-life migration testing at 40 °C for 10 days as prescribed in EU Regulation 10/2011 is used for fatty and aqueous simulants. The resin’s low extractable fraction reduces the risk of solvent-based printing ink interaction, but corona or plasma surface treatment can increase surface energy from 30 mN/m to 44 mN/m within 48 h of treatment.
