SIBUR HDPE 85612 IM
- Product Name: SIBUR HDPE 85612 IM
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
- CONTACT NOW
- SIBUR HDPE 85612 IM is typically used in formulations when melt flow rate, density, and processing temperature must be controlled within specific ranges.
| HS Code | 870366 |
| Product | SIBUR HDPE 85612 IM |
| Polymer Type | High-Density Polyethylene (HDPE) |
| Density | 0.956 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 8.0 g/10 min |
| Tensile Strength At Yield | 28 MPa |
| Tensile Strength At Break | 20 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1200 MPa |
| Charpy Notched Impact Strength 23 C | 5 kJ/m² |
| Shore D Hardness | 62 |
| Vicat Softening Temperature | 126°C |
| Melting Temperature | 132°C |
| Thermal Conductivity | 0.4 W/m·K |
| Water Absorption | <0.01% |
| Molding Shrinkage | 2.0% |
As an accredited SIBUR HDPE 85612 IM factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SIBUR HDPE 85612 IM is packaged in 25 kg polyethylene bags, with 40 bags per 1,000 kg pallet, stretch-wrapped. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): SIBUR HDPE 85612 IM in 25 kg bags, palletized, shrink-wrapped, evenly distributed, and secured for sea transport. |
| Shipping | SIBUR HDPE 85612 IM is shipped as non-hazardous polyethylene granules in 25 kg PE bags, palletized, stretch-wrapped, and secured for truck, rail, or sea container transport. Store in a cool, dry, ventilated area away from direct sunlight, heat, moisture, and sharp objects to prevent bag damage. |
| Storage | SIBUR HDPE 85612 IM should be stored in its original, sealed packaging in a clean, dry, well-ventilated warehouse. Protect from direct sunlight, moisture, dust, heat, and ignition sources. Keep away from oxidizing agents. Maintain ambient temperature and avoid prolonged UV exposure. Stack pallets securely at safe heights to prevent deformation, and follow first-in, first-out stock rotation. |
| Shelf Life | Shelf life is 12 months from manufacture when stored dry in original packaging, away from direct sunlight and heat. |
SIBUR HDPE 85612 IM is an injection-moulding high-density polyethylene with a melt-flow index of 5.6–6.4 g/10 min at 190 °C/2.16 kg per ISO 1133-1:2022 and a density of 0.955–0.958 g/cm³ per ISO 1183-1:2019. The grade occupies a medium-flow HDPE position in which thin-wall moulding speed and environmental stress-crack resistance are balanced against each other. Because HDPE is non-hygroscopic, drying is generally unnecessary below 60 % relative humidity; however, condensation on cold pellets transferred from outdoor silos at temperatures below 10 °C can generate surface splay in thin-wall parts when melt temperature exceeds 200 °C. Converters running shot weights below 15 g commonly observe that hot-runner balance and screw recovery become the productivity constraint rather than clamp force.
| Application cell | Melt temperature range | Mould temperature range | Hold-pressure range | Cycle-time range | Equipment configuration |
|---|---|---|---|---|---|
| Thin-wall dairy spreads containers | 200–235 °C | 12–25 °C | 25–55 MPa | 8–14 s | 16–32-cavity IML cell, 150–400 t |
| Still-beverage closures | 210–240 °C | 10–20 °C | 35–50 MPa | 6–9 s | 48-cavity hot runner, 200–350 t |
| Industrial pails | 220–250 °C | 15–30 °C | 50–70 MPa | 22–38 s | 1+1-stack mould, 600–1000 t |
| Returnable crates | 230–260 °C | 20–35 °C | 60–90 MPa | 35–70 s | 800–2000 t accumulator |
| Cosmetic flip-top caps | 200–230 °C | 15–25 °C | 45–60 MPa | 10–16 s | 12–24-cavity hot runner, 80–200 t |
When 85612 IM is processed into 150–500 mL dairy and spread containers with in-mould label decoration, the grade is typically run at a barrel set point between 200 °C and 235 °C, with mould temperature held at 12–25 °C to accelerate skin freezing. In 16–32-cavity IML cells, the label becomes the limiting factor in ejection: if the label edge temperature exceeds 45 °C during robot transfer, label curl can shift a 0.5 mm lip seal outside dimensional tolerance. The formulation for this application usually loads 3–6 wt% titanium dioxide masterbatch, 0.05–0.10 wt% erucamide slip additive, and 0.10–0.30 wt% silica anti-block. Regulatory compliance is governed by FDA 21 CFR 177.1520(c) 2.1 for olefin polymers intended for food contact and by Regulation (EU) No 10/2011 as amended by Regulation (EU) 2020/1245, Annex II, with an overall migration limit of 10 mg/dm² tested per EN 1186-1:2002. On production scale, the primary failure mode is sink marking around the stacking shoulder; hold pressure must be profiled from 55 MPa down to 25 MPa over 1.2–2.0 s to avoid gate blush while still compensating shrinkage. Terminal products include yogurt cups, butter and margarine tubs, dessert cups, and food-service portion containers.
What causes screw recovery to cap output on 48-cavity beverage closure lines below 8.0 s?
In high-cavitation closure moulding with SIBUR HDPE 85612 IM, the practical cycle floor is seldom fixed by injection pressure but by plasticizing time. On a 60 mm general-purpose screw with L/D 24:1, plasticizing capacity at a melt temperature of 210–240 °C is approximately 45–60 kg/h; a 48-cavity hot-runner tool producing 2.2 g closures in 8.0 s cycles consumes about 47.5 kg/h, leaving almost no recovery margin. If the set melt temperature is raised beyond 245 °C to lower viscosity, screw slip and generation of low-molecular-weight oxidation products become visible as gate stringing and odour, and the tether weld line begins to fail the slit tamper-evident pull-off test. The formulation commonly includes 1.5–2.5 wt% colour masterbatch and 0.05–0.15 wt% erucamide; excessive slip beyond 0.20 wt% reduces screw back-torque and can destabilise dosing repeatability. Food-contact compliance follows FDA 21 CFR 177.1520 and EU 10/2011, while closure torque retention is verified on production lots using a torque meter calibrated to 0.1 N·m. Terminal products include tamper-evident screw caps for UHT milk, edible oil, vinegar, and still beverages. Carbonated beverages are not the primary target because the grade’s creep resistance and linerless seal behaviour do not replace polypropylene in pressurised closures.
Weld-line pressure loss in 25-L pail moulds with in-mould handle inserts
A 25-L open-head pail moulded from 85612 IM typically weighs between 1.0 kg and 1.4 kg, and the flow front must travel 600–900 mm around the core before reuniting at the handle boss. At the recommended melt temperature of 220–250 °C and mould temperature of 15–30 °C, pressure drop along the weld-line region can exceed 30–40 MPa of the available 90–120 MPa injection pressure; if the handle insert is placed in a cold zone, a low-density weld line forms a crack path when the filled pail is lifted. On production equipment of 600–1000 t clamp force with single-cavity or stack moulds, valve-gate sequencing and dual injection points are used to shift the weld line away from the handle axis. The formulation for industrial pails may include 0.2–0.5 wt% hindered amine light stabiliser, 0.1–0.2 wt% antioxidant, and 2–4 wt% colour masterbatch. For UN-certified dangerous-goods packaging, the pail body must satisfy stacking, drop, and hydraulic pressure tests under UN 1H2/Y or 3H2/Y packaging design type, depending on closure geometry. Food-contact pails fall under FDA 21 CFR 177.1520 or EU 10/2011; industrial pails for solvent-containing products are evaluated for environmental stress-crack resistance under ASTM D1693-15, condition B, with failure time above 48 h at 50 °C in 10 % Igepal CO-630. Terminal products include 5–20 L pails, buckets, paint cans, and open-head drums with removable lids.
When returnable crates are run with 50 % regrind instead of virgin 85612 IM
During returnable logistics crate production on 800–2000 t large injection machines, the use of in-house regrind from sprues and post-consumer crate recyclate at 50 wt% lowers melt-flow stability and widens longitudinal thickness variation. At 230–260 °C melt temperature and 20–35 °C mould temperature, 100 % virgin 85612 IM feedstock exhibits a fill-pressure deviation of ±3 MPa across 8 sequential shots; at 50 % regrind, the same parameter frequently drifts to ±7 MPa, which is visible as warpage on ribs and as inconsistent stackability. The recommended stabiliser package for this scenario includes 0.2–0.6 wt% hindered amine light stabiliser and 0.1–0.3 wt% phenolic antioxidant; no filler is required unless the application specifies a stiffness index, in which case 5–10 wt% talc can be added with a corresponding loss of low-temperature impact. Compliance for returnable transport packaging is addressed under ISO 8611-2:2011 for palletised load testing, while beverage-crate stack-creep specifications commonly require 72 h compression at 40 °C with deformation below 5 mm. Published data for this specific virgin-regrind configuration is limited; converters should log cushion position and hydraulic pressure signals for five consecutive cycles before setting alarm limits. Terminal products include returnable beverage crates, dairy distribution crates, foldable bulk containers, and industrial pallets.
Cosmetic flip-top hinge flexural endurance under silicone lubricated thread torque
Hinge fractures in flip-top caps made from 85612 IM are not solely a material problem; they are induced by the interaction between mould orientation and the closure design’s hinge thickness. In cosmetic packaging, the hinge is typically 0.25–0.45 mm thick and is gated so that flow orientation is perpendicular to the hinge axis; that orientation gives flexural endurance above 1000 cycles in a 45° open-close cycle test when mould temperature remains at 15–25 °C. If the hinge is gated parallel to the axis, the same grade can crack below 300 cycles. The formulation includes 0.05–0.15 wt% erucamide slip and 0.10–0.30 wt% antistatic additive, with 1–2 wt% colour masterbatch; the antistatic loading should not exceed 0.35 wt% because migration can create a surface layer that interferes with pad-printing or hot-stamping. Regulatory compliance for cosmetic packaging uses REACH Annex XVII restrictions, FDA 21 CFR 177.1520 where the package may contact food or oral-care formulations, and EU 10/2011 for migration. On the cosmetic manufacturing line, cap torque retention is measured over 0–1.5 N·m, and thread stripping must not occur below 2.5 N·m. Terminal products include flip-top caps for shampoo and conditioner, lotion bottle closures, and dispensing caps for personal-care tubes.
In non-food household storage articles produced from 85612 IM, the standard process uses 1–4 wt% colour masterbatch, 190–220 °C melt temperature, 15–35 °C mould temperature, and medium-sized injection machines of 250–500 t clamp force, producing storage boxes, dustbins, and multi-purpose baskets under REACH Annex XVII with no food-contact testing required.
Competitive SIBUR HDPE 85612 IM prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Get Free Quote of Ascent Petrochem Holdings Co., Limited
Flexible payment, competitive price, premium service - Inquire now!
- SIBUR HDPE 85612 IM 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.
Designated SIBUR HDPE 85612 IM, this injection-moulding grade of high-density polyethylene is positioned for high-flow, thin-section applications in which packing pressure, dimensional repeatability, and ejection at short cycle times control unit cost. The grade-selective melt mass-flow rate is 8.5 g/10 min when measured at 190 °C with a 5 kg load according to ISO 1133-1:2022, and the density at 23 °C is 0.956 g/cm³ under ISO 1183-1:2019. These two values identify the material against high-molecular-weight pipe or blow-moulding grades in the same polymer family. The suffix IM is used by the supplier to denote injection moulding, whereas comparable grades for film extrusion or extrusion blow moulding are segregated by different suffix codes. Within the supplier’s HDPE portfolio, the 85612 IM designation is therefore not a general-purpose polyolefin but a controlled-rheology grade with a melt viscosity intended for injection machinery.
| Property | Test method | Nominal value |
|---|---|---|
| Melt mass-flow rate, 190 °C / 5 kg | ISO 1133-1:2022 | 8.5 g/10 min |
| Density, 23 °C | ISO 1183-1:2019 | 0.956 g/cm³ |
| Tensile stress at yield | ISO 527-2:2012 | 27 MPa |
| Tensile strain at break | ISO 527-2:2012 | >300 % |
| Flexural modulus | ISO 178:2019 | 1100 MPa |
| Charpy notched impact, 23 °C | ISO 179-1:2010 | 4.0 kJ/m² |
| Vicat softening point, A/50 | ISO 306:2022 | 126 °C |
| Mould shrinkage, flow / transverse, 48 h | ISO 294-4:2018 | 1.5–2.0 % / 1.0–1.5 % |
Published data for this specific configuration should be confirmed against the current supplier datasheet because additive package, pellet conditioning, and test specimen preparation influence the mechnical values. The melt flow rate and density are the grade-selective constants used for incoming resin verification.
Typical application fields are injection-moulded caps, closures, thin-walled containers, industrial crates, and appliance components with wall sections between 0.8 mm and 2.5 mm. The grade is suitable for multi-cavity tools with hot or cold runners, although hot-runner valve-gate systems require nozzle tip temperatures above 220 °C to prevent stringing and gate droplets. On high-cavitation closure lines with 48 to 96 cavities, the observed bottleneck is generally gate freeze time rather than screw recovery; plastication units with L/D ratios of 20:1 to 25:1 and compression ratios of 2.5:1 to 3.0:1 are adequate. Screw back-pressure is held between 5 bar and 10 bar hydraulic to avoid excessive shear heating and consequential viscosity loss.
What Thermal and Pressure Boundaries Govern Thin-Wall Processing?
At the press, melt temperature measured at the nozzle should be maintained between 210 °C and 250 °C; below 200 °C, the material may exhibit flow marks in long flow-length sections, while above 250 °C, the rate of thermo-oxidative degradation rises sharply. The upper limit is not a single-point failure; it is a residence-time-dependent threshold. A residence time of 8 min at 250 °C may reduce notched Charpy impact by more than 10 %, whereas the same residence time at 220 °C produces negligible change. Hydraulic injection pressures in the range of 500–800 bar are typical; specific melt pressure at the nozzle is commonly 50–80 MPa. Clamp force for closure moulds is allocated at 0.6–0.8 t/cm² of projected area; insufficient clamp force leads to flash at the parting line, while excessive clamp force can deform thin cores.
Cooling time for a 1.5 mm wall can be estimated from the thermal diffusivity of HDPE, approximately 0.14 mm²/s; ejection is usually possible after the centreline temperature falls below 105 °C, although rigid parts may require lower core temperatures. The material does not require predrying at ambient storage below 60 % relative humidity, but surface moisture on cold pellets entering a hot hopper can create splay defects. If condensation is observed, predrying at 80 °C for 2 h is sufficient. Mould temperature should be controlled between 20 °C and 50 °C; higher mould temperatures improve surface gloss but increase shrinkage and cycle time, while lower mould temperatures increase the risk of sink marks in thick bosses and ribs.
Compared with extrusion blow-moulding and pipe grades, 85612 IM exhibits lower molecular weight and a narrower molecular weight distribution, which reduces shear viscosity and improves melt index stability. In capillary rheometry at 190 °C and an apparent shear rate of 100 s⁻¹, the viscosity of this grade is in the region of 500–700 Pa·s, whereas pipe grades with melt flow rates below 1 g/10 min typically exceed 1800 Pa·s under equivalent conditions. This viscosity gap has two practical consequences. First, the injection grade fills thin sections with lower pressure and lower residual stress. Second, the injection grade cannot sustain a free-standing parison or maintain hoop strength in extruded pipe during calibration; using it in those processes would produce excessive sag and dimensional drift.
Comparative Property Profile Against Pipe and Blow Moulding Grades
At equal density, the injection-moulding grade shows a lower Charpy notched impact value than high-molecular-weight blow-moulding grades; 4.0 kJ/m² at 23 °C is adequate for caps and crates but below the 8–15 kJ/m² range common for pipe and blow-moulding products. The difference arises from molecular weight and tie-chain concentration. Blow-moulding and pipe grades are polymerised to higher average molecular weights to generate long-chain branching or a broader distribution; this raises melt strength and slow crack growth resistance but lowers MFR. In contrast, the injection grade is designed to minimise cycle time and allow fine replication of injection-tool surfaces, accepting lower slow crack growth performance. Thus the choice between the grades is not a quality hierarchy but a process-specific trade-off between flowability and environmental stress crack resistance.
In thin-wall containers, shrinkage after 48 h at 23 °C and 50 % RH is anisotropic; flow-direction shrinkage is typically 1.5–2.0 % and transverse shrinkage is 1.0–1.5 % when measured under ISO 294-4:2018. The difference is caused by orientation of the polyethylene chains in the flow direction and by differential crystallinity across the thickness. To stabilise flatness, mould temperature must be controlled within ±5 °C across the cavity surface, and coolant circuits should be balanced so that the temperature rise across the circuit does not exceed 5 °C. Warp after demoulding cannot be corrected by annealing at temperatures below 60 °C; post-moulding dimensional change above that threshold is small but risks distortion of external geometry.
When Cycles Below Eight Seconds Expose Additive and Rheological Limits
When cycle time is driven below 8 s, the nucleated crystallisation kinetics and the stabiliser package become decisive. The grade is formulated for rapid solidification, but the removal of heat from the core of a 2 mm wall remains diffusion-limited. For a 2 mm thick part, the conduction-limited cooling time is proportional to the square of wall thickness; reducing wall thickness from 2.0 mm to 1.0 mm can reduce cooling time by a factor of roughly four. However, the same reduction increases shear heating at constant injection speed, so melt temperature at the gate can exceed the nozzle setpoint by 10–20 °C in high-speed filling. This must be controlled through nozzle melt-temperature measurement rather than cylinder setpoint alone.
Regrind addition above 20 wt% widens residence-time distribution and increases lot-to-lot variation in Charpy impact; if recycled material is used, segregation of fines and dust must be prevented because fines melt earlier and degrade faster in the compression zone. The stabiliser package is designed for standard injection-moulding residence times, but prolonged exposure to oxygen at melt temperatures above 250 °C or residence times beyond 12 min can initiate oxidation, visible as yellowing and a reduction in notched impact strength. Processors should purge the barrel with a low-MFR HDPE or a commercial purging compound after interruptions longer than 15 min.
For food-contact applications, the final article must be evaluated under EU Regulation 10/2011 with migration testing appropriate to the food simulants, or under FDA 21 CFR 177.1520 for olefin polymers used in contact with food. The base resin is not self-certifying; colour concentrates, antistatic agents, slip agents, and carrier resins alter overall migration and specific migration limits. Converters should request the supplier’s statement of composition and verify that the grade does not contain substances above the 0.1 wt% threshold for substances of very high concern under REACH. For toys, heavy metal migration must be checked according to EN 71-3. Processing with polypropylene or PET residues in the hopper, hot runner, or screw flights creates immiscible interfaces at weld lines and reduces impact strength; purge cycles with a dedicated HDPE purging compound are required after material changes. Chlorine-containing additives or flame retardants that generate hydrogen chloride during processing should be avoided because acid-catalysed degradation accelerates chain scission. The material should not be stored in direct sunlight for prolonged periods because ultraviolet exposure degrades the outer pellet surface and can introduce gels and black specks even though the bulk melt flow rate remains within specification.
