| HS Code | 855936 |
| Product | MOPLEN PP HP456J |
| Polymer Family | Polypropylene Homopolymer |
| Density | 0.9 g/cm³ |
| Melt Flow Rate | 4.0 g/10 min (230°C, 2.16 kg) |
| Tensile Stress At Yield | 35 MPa |
| Flexural Modulus | 1450 MPa |
| Elongation At Yield | 11% |
| Notched Charpy Impact Strength At 23c | 4.5 kJ/m² |
| Heat Deflection Temperature 0 45mpa | 94°C |
| Melting Temperature | 160°C |
As an accredited MOPLEN PP HP456J factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MOPLEN PP HP456J is supplied as solid pellets in 25 kg multi-ply paper bags, palletized and shrink-wrapped for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loaded with 25kg bags of MOPLEN PP HP456J on shrink-wrapped pallets, securely stowed for safe transport. |
| Shipping | MOPLEN PP HP456J is a polypropylene homopolymer resin supplied as free-flowing pellets. Shipping classification: non-hazardous / not dangerous goods. Packaged in 25 kg bags, octabins, or bulk bags. Transported by road, sea, or rail in clean, dry containers. Store away from heat, ignition sources, and excessive humidity. Avoid dust accumulation. |
| Storage | Store MOPLEN PP HP456J in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed when not in use to prevent moisture contamination and foreign matter ingress. Maintain indoor temperatures below 40°C and avoid prolonged storage at high humidity. Use proper handling equipment and keep away from oxidizers. |
| Shelf Life | Shelf life is indefinite if stored in a dry, cool place away from direct sunlight and heat sources. |
MOPLEN PP HP456J is an injection moulding grade polypropylene homopolymer with a nominal melt flow rate of 3.4 g/10 min measured at 230°C under 2.16 kg load in accordance with ISO 1133-1:2022. The pelletized feed has a typical density of 0.90 g/cm³ per ISO 1183-1 and is processed on general-purpose polyolefin screw-and-barrel systems. The absence of ethylene comonomer raises crystalline stiffness, reduces low-temperature impact, and narrows the practical processing envelope when compared with propylene–ethylene block copolymers. Melt temperature is conventionally maintained between 220°C and 250°C. Barrel residence time above 270°C should be avoided because thermo-oxidative chain scission begins to reduce melt viscosity and can produce surface silver streaks.
In rigid storage container and logistics box moulding, HP456J is run on hydraulic or hybrid injection units with clamp forces between 800 kN and 8000 kN, depending on projected area and packing pressure. On a 2000 kN machine with a 60 mm three-zone screw at L/D 22:1, barrel settings of 210°C feed, 230°C compression, 240°C metering and 235°C nozzle are used. Injection pressure is set between 80 MPa and 110 MPa, with holding pressure 60–80 MPa and holding time 3–5 s per millimetre of nominal wall. Mould temperature is controlled between 20°C and 40°C through turbulent water channels. Shrinkage measurements on 2.0 mm plaques under ISO 294-4 typically fall between 1.2% and 1.8%; gate location changes shrinkage anisotropy from 0.1% to 0.5%. Stackable crates are moulded within a tensile modulus range of 1.4–1.5 GPa when tested per ISO 527-2/1A/50, but drop impact at -20°C is not equivalent to propylene–ethylene block copolymers. Conditioned transport at sub-zero temperature should not specify this grade without a verified low-temperature impact test. For food-contact storage articles, base-resin status must be confirmed against FDA 21 CFR 177.1520 and EU 10/2011 with the final additive package because processing-aid and pigmentation choices migrate independently.
In 28 mm continuous-thread closures for household non-carbonated liquids, HP456J supports initial removal torque after 24 h of 1.5–2.5 N·m when the liner is PE/EVA foam or aluminium-faced liner and the application torque is controlled at 1.8–2.2 N·m. Torque retention is measured in accordance with ASTM D2063/D2063M-10(2018) at 23°C and 50% relative humidity. In continuous-use pack tests with aggressive surfactants, homopolymer polypropylene grades can exhibit environmental stress cracking at moulded-in stresses near the bridge and tamper-evident band. Closure design must limit local hoop stress to below 5 MPa when the product contains more than 5 wt% nonionic surfactant or d-limonene. The melt is processed at 235–245°C with a hot runner manifold set to 235°C and a cold sprue bush diameter of 2.5 mm. Injection speed of 80–120 mm/s is used for a 32-cavity closure mould with 24 mm screw diameter. Cycle time is 6–8 s at wall thickness 1.2 mm. Brittleness at 0°C means the tamper-evident band should be notched or scored to ensure shredding rather than ductile hinge deformation.
In thin-wall containers with nominal wall below 1.0 mm, cycle time is controlled by heat transfer from the frozen skin to the tool surface. For a 0.6 mm wall, theoretical cooling time is approximated by t_c ≈ (s²/π²α) ln( (4/π) (Tm - Tw)/(Te - Tw) ), where α for homopolymer PP is approximately 0.08 mm²/s. At melt temperature 250°C, mould temperature 10°C and ejection temperature 80°C, calculated cooling time is approximately 2.5–3.5 s. In practice, HP456J with MFR 3.4 g/10 min requires higher injection speeds than high-flow PP random copolymers. Injection speed is set at 200–350 mm/s on accumulator-assisted machines with hydraulic response below 40 ms. Gate diameter must remain between 0.8 mm and 1.5 mm to avoid shear-thinning loss and freeze-off before packing. Melt temperature above 260°C can reduce pressure loss but shortens the thermo-oxidative induction time; flame treatment or organoleptic testing may reveal oxidation byproducts. The processing window of ±5°C around the nozzle arises because lower temperatures create short shots in ribs and upper temperatures increase gate blush. Asymmetric cooling produces warpage when post-mould shrinkage anisotropy exceeds 0.3%; fixture cooling jigs are specified for 0.45 mm wall dairy cups. Terminal products are thin-wall dairy cups and deli containers with lid fitment; barrier is not provided by the polymer.
Where low-load appliance components are produced from HP456J, the main engineering risk is not short-term tensile strength but creep under continuous loads at elevated service temperatures. Detergent drawer bodies, fascia panels and control-panel brackets are moulded with wall thicknesses from 1.5 mm to 2.5 mm. Flexural modulus measured per ISO 178 at 23°C is used as the stiffness validation; the unfilled homopolymer typically sits between 1.3 GPa and 1.6 GPa. Heat deflection temperature under 0.45 MPa load per ISO 75-2/B remains below 100°C, so structural retention at 60–80°C depends on creep modulus data per ISO 899-1. When sustained tensile stress exceeds 5 MPa at 60°C, total creep strain in air can exceed 1% within the first 1,000 h, causing dimensional drift in snap-fit joints. Hot runner sequential valve gates are specified when weld lines cross a snap arm; weld-line tensile strength retention in homopolymer PP is lower than block copolymer unless melt temperature is maintained above 230°C and pack pressure above 60 MPa. Detergent contact at 60°C requires pre-screening with the final fragrance/alcohol package because homopolymer PP undergoes surface stress cracking with certain terpenes and branched alcohols. Electrical/electronic appliance use may require compliance with EN 60335-1 and RoHS Directive 2011/65/EU; RoHS screening is additive-driven rather than polymer-driven.
Addition of a sorbitol-based clarifier or sodium benzoate nucleating agent at 0.10–0.25 wt% raises crystallization onset temperature and reduces cycle time by shortening demoulding temperature hold. In toy block and educational lens applications, the nucleated HP456J compound is moulded at 230–255°C, but clarifier thermal stability decreases above 255°C, producing plate-out on the mould surface. Differential scanning calorimetry per ISO 11357-3 shows crystallization peak shift from approximately 117°C to above 125°C, allowing mould temperature to be raised from 20°C to 30°C without increasing shrinkage beyond 1.5% on 2.0 mm plaques. Gloss at 60° is measured per ISO 2813; nucleated plates show less surface haze but more visible flow lines when gate speed exceeds 150 mm/s. Toy applications require compliance with EN 71-3:2019+A1:2021 for nineteen-element migration in 0.07 M HCl at 37°C for 2 h, and the finished article must meet REACH Annex XVII entry 51 for phthalates. Impact at 23°C is sufficient for rigid blocks, but drop performance at 0°C is not equivalent to high-impact copolymer grades. Child-resistant packaging should specify a minimum wall thickness of 1.5 mm at hinge points.
| Requirement | Standard | Test condition or limit |
|---|---|---|
| US food-contact olefin polymer base resin | FDA 21 CFR 177.1520 | Final article migration test per food type and condition of use A–H |
| EU food-contact overall migration | EN 1186-1 | Simulants A, B, D2; 10 mg/dm² limit |
| Toy elemental migration | EN 71-3:2019+A1:2021 | 0.07 M HCl at 37°C for 2 h; nineteen-element limits |
| Phthalate restriction | REACH Annex XVII entry 51 | DEHP, DBP, BBP combined < 0.1 wt% in plasticised material |
HP456J serves as a commodity homopolymer base for 20–40 wt% talc or calcium carbonate filled compounds used in appliance bodies, houseware shells and non-load-bearing automotive interior trim. Compounding is performed on a co-rotating twin-screw extruder with L/D 40:1 and side stuffing at barrel 5 of 10. Barrel temperatures are set to 190°C feed, 210°C mixing and 220°C die, with screw speed 350–500 rpm and specific mechanical energy input 0.18–0.25 kWh/kg. Fine talc at 20 wt% reduces shrinkage to 0.8–1.2% on 2.0 mm plaques and increases flexural modulus from 1.3 GPa to above 2.0 GPa per ISO 178. Charpy notched impact at 23°C falls from approximately 3.0 kJ/m² to below 2.0 kJ/m² when measured per ISO 179-1/1eA. Screen pack melt filtration before pelletizing uses 60/120/60 mesh breaker plates; pressure rise across the screen pack above 8 MPa indicates poor talc wetting or moisture, requiring die-head temperature adjustment below 230°C. Compounds containing calcium carbonate above 30 wt% are processed at 200–215°C to avoid carbonate decomposition; screw torque increases by 15–20% and production rate may be limited by feeder consistency rather than extruder capacity. Batch-to-batch variation in filler top-cut changes sieve residue; a 325-mesh screen residue above 0.05 wt% is rejected because it blocks hot runner tips below 1.0 mm diameter. Finished compounds must be dried at 80°C for 2 h when packaged in unlined kraft bags exposed to relative humidity above 60%.
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MOPLEN PP HP456J is an isotactic polypropylene homopolymer grade supplied by LyondellBasell under the Moplen trade name. The material is produced for injection-moulding conversion routes in which controlled melt rheology, rigidity, and resistance to deformation under load are required. Because the macromolecular chain consists of propylene repeat units without intentional ethylene or butene comonomer insertion, the grade develops a semi-crystalline morphology upon cooling. The crystalline regions raise flexural modulus and hardness relative to random copolymer grades, while the absence of a discrete elastomeric phase lowers the capacity for energy absorption at subambient temperatures. The product is normally supplied as pellets with an antioxidant stabilization package; colorants, nucleating masterbatches, and other modifiers are introduced during processing rather than in the base resin. The precise additive formulation is not disclosed in routine commercial documentation, and lot-specific certificates should be read alongside the current producer datasheet.
The product designation contains the polymer family identifier PP, the brand name Moplen, and the grade code HP456J. The alphanumeric suffix differentiates the grade within the producer’s polypropylene portfolio by melt-flow range, nucleation behavior, and intended conversion process. HP456J falls into the medium-flow injection-moulding range, placing it between low-flow extrusion grades and high-flow thin-wall injection grades. Published data for this specific configuration is limited to standard property sheets; proprietary molecular-weight distribution, catalyst residue, and additive concentration data are not supplied in commercial technical literature.
The grade is characterized by injection-moulded specimens prepared under conditions aligned with ISO 1873-2. The property values listed below are typical values, not specification limits, and are subject to lot-to-lot variation, specimen preparation history, and cooling-rate differences. A certificate of analysis issued for a specific lot takes precedence over generic data-sheet values.
| Property | Test method | Unit | Typical value |
|---|---|---|---|
| Melt mass-flow rate at 230 °C/2.16 kg | ISO 1133-1:2022 | g/10 min | 3.5 |
| Density | ISO 1183-1:2019 | g/cm³ | 0.900 |
| Tensile stress at yield | ISO 527-2:2012 | MPa | 34 |
| Tensile strain at yield | ISO 527-2:2012 | % | 9.0 |
| Flexural modulus | ISO 178:2019 | MPa | 1500 |
| Notched Charpy impact strength at 23 °C | ISO 179-1:2023/1eA | kJ/m² | 4.0 |
| Vicat softening temperature, method A50 | ISO 306:2022 | °C | 154 |
| Heat deflection temperature at 0.45 MPa | ISO 75-2:2013 method B | °C | 100 |
| Rockwell hardness, R scale | ISO 2039-2:1987 | R | 100 |
Specimen preparation differences can shift flexural modulus and impact values because flow-induced orientation is not identical in every cavity. The melt mass-flow rate is a single-point laboratory viscosity proxy and does not capture the full shear-rate response of the melt. For gate and runner balancing, capillary rheometry or oscillatory shear measurements across the relevant processing shear-rate range should be used. The Vicat softening temperature and heat deflection temperature are not long-term service-temperature ratings; they are comparative values obtained under standardized heating conditions.
Drying is generally unnecessary for polypropylene homopolymers stored in dry indoor conditions because saturated moisture uptake is below 0.02 % by mass. When regrind, hygroscopic color masterbatch, or outdoor silo storage introduces surface moisture, dehumidified-air drying at 80 °C for 2 h to 4 h is applied. The dryer dew point should be maintained below −20 °C to prevent condensation on pellet surfaces during hopper transfer.
The melt-temperature window for this class of homopolymer typically extends from 200 °C to 250 °C. The lower boundary is constrained by the risk of unmelted crystalline fragments in the screw transition zone; the upper boundary is limited by oxidative chain scission and yellowing at prolonged residence time. On a reciprocating-screw injection-moulding machine, practical barrel set points are ordinarily rear 180 °C to 200 °C, centre 210 °C to 230 °C, front 220 °C to 240 °C, and nozzle 220 °C to 250 °C. The exact profile depends on screw L/D ratio, screw recovery time, and shot size relative to barrel capacity.
Mould temperature controls the growth of the crystalline skin layer and the thickness of the oriented shear layer. A mould-temperature range of 20 °C to 60 °C is typical. For dimensionally stable closures and thick-walled housewares, mould temperatures between 30 °C and 50 °C are commonly used. Lower mould temperatures shorten cycle time but increase the frozen-layer fraction and may raise injection-pressure demand. In thin-wall sections below 1.0 mm, the fill phase must be completed before the flow front cools below the no-flow temperature; this frequently requires fill times below 1.0 s and melt temperatures near the upper end of the window.
Injection velocity and packing pressure are coupled through the pressure-volume-temperature behavior of the semicrystalline melt. Peak hydraulic injection pressure is not a material property; it scales with part thickness, flow length, gate geometry, and melt viscosity. Moulding trials on conventional hydraulic machines often report peak injection pressures between 70 MPa and 120 MPa for thin-wall articles, while thicker sections may fill at lower pressure. The pack phase should maintain cavity pressure until gate freeze-off; a packing pressure of 50 % to 70 % of peak injection pressure is a practical starting point, with pack time determined by gate seal time rather than by a fixed timer. Insufficient packing produces sink marks opposite ribs and bosses; excessive packing increases gate stress and may induce warpage through differential crystallinity.
For compounding, pigmentation, or filler addition, a co-rotating twin-screw extruder with screw diameter between 25 mm and 75 mm and an L/D ratio of 32:1 to 40:1 is a standard production platform. Barrel temperatures during compounding are maintained between 180 °C and 230 °C, with screw speed adjusted to keep melt temperature at the die below 240 °C. Side feeding of talc or calcium carbonate is used when a filled variant is required, but the unfilled HP456J base resin is not normally compounded before injection moulding unless masterbatch dilution is needed.
Shrinkage is anisotropic in polypropylene homopolymers because molecular orientation and cooling-rate gradients are directionally dependent. Mould shrinkage for unfilled injection-moulded parts typically falls between 1.0 % and 2.0 % when measured according to ISO 294-4 after conditioning at 23 °C and 50 % relative humidity. Higher mould temperature can increase crystallinity and therefore increase shrinkage, while lower mould temperature may freeze orientation and produce more post-mould dimensional drift. Post-mould annealing at 80 °C to 100 °C can reduce residual stress but may also increase final crystallinity.
On production lines, failures associated with this material class include screw-recovery overload when barrel temperatures are too low, gate blush when injection velocity is excessive, and dimensional drift when cooling time is shortened below the crystallization half-time. Batch-to-batch viscosity shifts can require trim adjustment of melt temperature or pack pressure, even when the melt-flow-rate certificate remains within the accepted release band. A general-purpose metering screw with a compression ratio of 2.5:1 to 3.5:1 and an L/D ratio of 20:1 to 24:1 is adequate for unfilled injection moulding; abrasive wear is low compared with glass-filled compounds, but contaminated regrind can accelerate check-ring and nozzle wear.
Commercial applications for HP456J are concentrated in rigid injection-moulded articles in which the combination of medium flow and homopolymer stiffness is acceptable. The grade is used in caps and closures, thin-wall food containers, housewares, appliance housings, and small technical components. The choice of homopolymer rather than random copolymer is often driven by the need for higher flexural modulus and heat deflection temperature, not by optical clarity or seal performance. For packaging containers in which top-load capacity is a controlling requirement, comparative testing should follow ASTM D2659.
Food-contact status is application-specific and must be confirmed against the current supplier declaration for the finished article. Polypropylene homopolymers of this type are generally capable of meeting the compositional requirements of FDA 21 CFR 177.1520 for olefin polymers and the overall migration limit of 10 mg/dm² specified in Commission Regulation (EU) No 10/2011 when tested with the prescribed food simulants and time/temperature conditions. Low-molecular-mass additives and oligomers migrate from polypropylene by Fickian diffusion through the amorphous fraction; the crystalline domains act as impermeable barriers. Migration testing therefore requires time/temperature conditions that simulate the intended contact, because the apparent diffusion coefficient increases with temperature and with the solubility of the migrant in the simulant. The absence of a rubber phase in the homopolymer simplifies the migration model but does not eliminate the need for finished-article testing.
The operational boundary for HP456J includes reduced suitability for continuous exposure to strong oxidizing acids, aromatic and chlorinated hydrocarbons, and high-UV environments without adequate stabilization. The standard grade is not inherently flame retardant; applications requiring UL 94 V-0 classification require a flame-retardant additive package that may not be present in the base resin. In applications requiring subzero impact toughness, an impact copolymer should be evaluated instead.
The following matrix compares the architectural classes rather than specific commercial grades. Relative differences are meaningful when the same test method and specimen preparation route are used.
| Performance axis | HP456J homopolymer | Random copolymer | Heterophasic impact copolymer |
|---|---|---|---|
| Flexural modulus | Higher stiffness; typical value near 1500 MPa | Lower by 10 % to 30 % | Lower, depending on rubber content |
| Notched impact at 0 °C | Low | Moderate | High |
| Optical behavior | Translucent; not a clarity grade | High clarity in thin film and sheet | Opaque |
| Heat resistance | Higher melting range; Vicat near 154 °C | Reduced by comonomer insertion | Similar crystalline phase but tougher |
| Typical conversion routes | Injection moulding, compounding base | Film, blow moulding, injection moulding | Automotive parts, rigid packaging |
Relative to high-flow homopolymer grades with an MFR above 25 g/10 min, HP456J has a lower melt-flow value. This lower flow increases the pressure required to fill very thin sections and reduces the economic appeal for ultra-thin-wall packaging, but it preserves higher melt strength and reduces the probability of flash in multi-cavity tools. Relative to low-flow extrusion grades with an MFR below 1.0 g/10 min, HP456J fills injection moulds with lower melt temperature and shorter cycle time, but it is less suitable for extruded sheet and thermoforming processes requiring high melt strength.
The suffix J in the grade designation is supplier-specific nomenclature and should not be interpreted as indicating a heat-resistant, food-contact, or high-purity status without verification. The primary differentiation within the Moplen injection-moulding range is based on melt-flow rate, additive formulation, and the presence or absence of comonomer or rubber phases. For a closure with a continuous service temperature below 60 °C and no subzero impact requirement, the homopolymer stiffness of HP456J supports reduced part mass; for a freezer-to-microwave container, a random or impact copolymer would be evaluated instead because low-temperature impact and seal performance are limited in the homopolymer architecture.
