| HS Code | 104873 |
| Resin Type | Polypropylene Homopolymer |
| Density | 0.90 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 12 g/10 min |
| Tensile Stress At Yield | 34 MPa |
| Tensile Strain At Yield | 10% |
| Flexural Modulus | 1400 MPa |
| Charpy Notched Impact Strength 23 C | 4 kJ/m² |
| Heat Deflection Temperature 1 8 Mpa | 65 °C |
| Vicat Softening Temperature A50 | 155 °C |
| Rockwell Hardness R Scale | 100 |
| Melting Temperature | 160 °C |
| Mold Shrinkage | 1.5-2.0% |
As an accredited MOPLEN PP HP550J factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MOPLEN PP HP550J is packaged in 25 kg polyethylene-lined paper bags, palletized and stretch-wrapped for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with MOPLEN PP HP550J polypropylene resin, safely palletized and secured for transport. |
| Shipping | MOPLEN PP HP550J is a polypropylene homopolymer supplied as free-flowing granules. It ships in sealed multi-wall paper bags, FIBCs, or bulk hopper containers. Store in a dry, well-ventilated area away from heat, ignition sources, and direct sunlight. Not classified as dangerous cargo; avoid dust accumulation and static discharge. |
| Storage | Store MOPLEN PP HP550J in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture contamination and dust accumulation. Avoid contact with strong oxidizers. Maintain good housekeeping to minimize static discharge. Under these conditions, shelf life is typically stable for several years. |
| Shelf Life | Shelf life is typically 12 months from delivery if stored unopened in dry, cool conditions away from sunlight and heat. |
Injection molded rigid houseware and organization products manufactured from MOPLEN HP550J require a controlled mold-temperature differential not exceeding 10–15 °C between fixed and moving halves to suppress differential shrinkage in flat bases and lid engagement features. With a nominal melt flow rate of 3.5 g/10 min under ISO 1133-1:2022, the grade is specified for medium-wall houseware rather than sub-1.0 mm thin-wall packaging. Dry-blend ratios observed on production lines are 96.0–98.5 wt% virgin MOPLEN HP550J, 1.0–2.0 wt% polyolefin-compatible color masterbatch, and 0.5–1.5 wt% glycerol-monostearate antistatic masterbatch. For household articles sold in the EU, REACH Annex XVII entries 51 and 52 restrict phthalates, and EN 71-3:2019+A1:2021 sets migration limits for barium, cadmium, chromium, lead, and mercury; for food-contact storage boxes, Commission Regulation (EU) No 10/2011 total migration limit is 10 mg/dm², and U.S. food-contact uses are governed by FDA 21 CFR 177.1520(c).
Processing takes place on servo-hydraulic injection molding machines with clamp force 3,000–8,000 kN, a three-zone general-purpose screw of L/D 20:1–24:1, and compression ratio 2.0:1–2.5:1. Barrel temperatures are profiled from 210 °C at the feed zone to 240–250 °C at the nozzle, with mold temperature 30–50 °C and holding pressure 50–70% of peak injection pressure, which is 70–100 MPa for wall sections of 2.0–4.0 mm. Pre-drying at 80 °C for 2 h is deployed only when cold pellets are transferred to warm shop-floor air at relative humidity above 80%; otherwise condensation-induced splay occurs. Terminal product types include stackable storage crates, rectangular organizer trays, garment hangers, wastepaper baskets, and bucket bodies. The dominant quality defect in this product class is warpage in flat-bottom parts when cooling channels are not balanced within 2–3 °C across the mold face.
Closure shells for non-carbonated syrups, personal-care bottles, and pharmaceutical dosing containers are molded from MOPLEN HP550J at 96.0–98.5 wt% with 1.0–2.0 wt% color concentrate and 0.5–2.0 wt% erucamide slip masterbatch. The critical filling constraint is tamper-evident band hinge thickness; when hinge wall section drops below 0.7 mm, the grade’s low-flow rheology produces short shots or incomplete hinge curl in multi-cavity hot-runner tools. Compliance for food-contact closures is assessed under Commission Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520(c); pharmaceutical dispensing closures require USP <661.1> plastic packaging assessment and, in the EU, European Pharmacopoeia Chapter 3.1.6 for polyolefins.
Processing uses 24- to 64-cavity valve-gate hot-runner injection molds with melt temperature 215–245 °C, mold temperature 15–30 °C, and cycle time 6–10 s for 2.0–3.5 g closures. Injection speed profiling is required to avoid jetting at the gate; peak injection pressure is 80–120 MPa and hold pressure is 60–80% of peak. Terminal product types include flip-top caps, screw closures, dosing caps, and dispensing fitments. Published data for this specific product in high-cavitation closure tools is limited; however, process validation typically maps short-shot behavior against gate diameter and wall section because the nominal MFR of 3.5 g/10 min per ISO 1133-1:2022 imposes longer fill times than closure grades with MFR above 25 g/10 min.
In appliance structural brackets, lint-filter housings, refrigerator interior brackets, and small-appliance base frames, MOPLEN HP550J is formulated at 92.0–97.0 wt% natural resin, 2.0–5.0 wt% lightfast color masterbatch, 0.1–0.5 wt% hindered-amine light stabilizer, and 0.3–0.8 wt% antistatic masterbatch where dust accumulation on white goods is a concern. Compliance is assessed under IEC 60335-1:2020 clause 30.2.3 for glow-wire ignition temperature and under UL 94 HB for flammability at wall thickness ≥3.0 mm; RoHS Directive 2011/65/EU Annex II and REACH Annex XVII substance restrictions apply at the final-assembly level. Processing uses injection molding machines with clamp force 5,000–12,000 kN, melt temperature 230–250 °C, mold temperature 40–80 °C, and core-cooling circuits sized for typical PP appliance tool heat rejection of 0.5–0.7 W/cm² of projected area.
Continuous service temperature governs design. Repeated exposure to temperatures above 80 °C under continuous mechanical load produces creep in unfilled homopolymer PP; unsupported spans should not exceed 100 mm when load exceeds 0.5 MPa. Tensile creep modulus for the unfilled homopolymer PP class at 1,000 h is typically 1,100–1,300 MPa at 23 °C per ISO 899-1, but published data specific to MOPLEN HP550J in this test configuration is limited. Terminal products include washing-machine lint filter housings, refrigerator shelf brackets, vacuum cleaner wheel bodies, and air-conditioner drain pans.
Industrial pail bodies and lids for paint, construction chemicals, and regulated liquids do not use MOPLEN HP550J as an unmodified base resin because homopolymer PP fails brittle at −20 °C in drop testing. The production formulation is 85.0–92.0 wt% MOPLEN HP550J as the continuous phase, 6.0–12.0 wt% ethylene-propylene impact modifier masterbatch, 1.0–3.0 wt% carbon black or inorganic pigment masterbatch, and 0.2–0.5 wt% processing stabilizer. UN dangerous-goods packaging certification for pails is based on ADR/RID 6.5.4.8 drop tests at −18 °C and ADR/RID 6.5.4.9 stack load tests; food-contact pail liners fall under EU No 10/2011 and FDA 21 CFR 177.1520(c).
Production takes place on accumulator-head extrusion blow molding machines or high-tonnage injection molding machines with melt temperature 210–240 °C, mold temperature 20–50 °C, and screw back pressure 1.0–2.0 MPa to disperse the impact modifier without excessive shear heating. Terminal products include 5–20 L open-head pails, tamper-evident lid systems, and solvent-resistant paint containers. Adding elastomer above 12.0 wt% reduces top-load strength and creates sink marks at handle bosses; below 6.0 wt%, pail sidewalls fail at the −18 °C drop condition. Batch-to-batch dispersion is checked by notched Izod impact tests per ISO 180/A, with typical production control limits of 6.0–10.0 kJ/m² at 23 °C for the modified compound.
Compounding lines use MOPLEN HP550J as the matrix resin for mineral-filled polypropylene compounds supplied to automotive interior trim and appliance housing injection molders. A typical formulation is 60.0–72.0 wt% MOPLEN HP550J, 20.0–35.0 wt% surface-treated talc with median particle size 1.5–2.5 µm, 2.0–5.0 wt% maleic-anhydride-grafted PP coupling agent, 0.5–1.5 wt% primary/secondary antioxidant package, and 1.0–3.0 wt% carbon black or pigment masterbatch. Automotive interior emissions compliance is assessed under VDA 278:2011 for volatile organic compounds and fogging; mechanical property testing follows ISO 527-1, ISO 178, ISO 179-1, and ISO 6603-2.
Compounding takes place on co-rotating twin-screw extruders with L/D 40:1–52:1, screw diameter 40–92 mm, screw speed 400–800 rpm, and temperature profile 180–230 °C. Talc is introduced by side-feeding after the melting zone to limit screw wear and prevent platelet fracture. Terminal products include injection-molded automotive air ducts, interior trim substrates, household appliance housings, and garden furniture structural parts.
| Talc loading (wt%) | Flexural modulus (ISO 178, MPa) | Notched Izod at 23 °C (ISO 180/A, kJ/m²) | Heat deflection temperature 0.45 MPa (ISO 75-2/B, °C) |
|---|---|---|---|
| 0 | 1,200–1,600 | 3.0–4.5 | 90–100 |
| 20 | 2,500–3,000 | 3.5–5.0 | 110–120 |
| 35 | 3,500–4,200 | 2.0–3.5 | 125–135 |
Values in Table 1 represent industrial compound class data; published data for this specific configuration is limited and should be verified on production equipment.
For shallow rigid trays used in non-sterile packaging, extruded monolayer sheet produced from MOPLEN HP550J is fed to thermoforming lines. Formulation ratios are 94.0–97.5 wt% HP550J, 1.0–3.0 wt% white or colored masterbatch, 0.5–2.0 wt% slip/antiblock masterbatch, and 0.2–0.5 wt% acid scavenger. Compliance is assessed under EU No 10/2011 for food-contact trays and under FDA 21 CFR 177.1520(c); for non-food industrial trays, no specific migration limit applies. The sheet line uses a single-screw extruder with L/D 30:1–36:1, melt temperature 210–230 °C, chill roll temperature 70–90 °C, and roll stack gap set to produce sheet thickness 0.5–1.5 mm. Thermoforming uses contact heating to 160–180 °C surface temperature and plug-assisted forming with aluminum tools.
Sheet thickness variation above ±0.10 mm across a 600 mm web causes non-uniform sag in the thermoform station; therefore, calendering gap and roll temperatures are controlled within ±2 °C. The low melt flow rate of the grade reduces neck-in at the die compared with high-flow PP but limits line speed to 15–30 m/min for sheet thickness below 1.0 mm. Terminal products include retail blister trays, cosmetic display trays, cold-formed insert trays, and industrial stacking trays.
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MOPLEN PP HP550J is classified as a polypropylene homopolymer with a nominal melt flow rate of 50 g/10 min at 230 °C/2.16 kg per ISO 1133-1:2022. Its density of 0.900 g/cm³ by ISO 1183-1 indicates a non-filled polypropylene with no mineral reinforcement. The molar mass distribution of the resin is shifted to lower average molecular weight relative to lower-flow homopolymer grades, which produces the high melt flow rate and low processing viscosity. The product is intended for injection molding of thin-wall components, rigid packaging, and technical articles that require fast cavity filling and short cycle times. Because the polymer is not a random copolymer or an impact copolymer, it retains high stiffness but limited low-temperature toughness. The material is supplied as natural pellets; additive packages vary by production site and must be specified through the manufacturer’s technical data sheet.
| Property | Typical value | Test method |
|---|---|---|
| Melt flow rate | 50 g/10 min | ISO 1133-1:2022 |
| Density | 0.900 g/cm³ | ISO 1183-1 |
| Tensile modulus | 1500 MPa | ISO 527-2 |
| Tensile stress at yield | 35 MPa | ISO 527-2 |
| Tensile strain at yield | 8 % | ISO 527-2 |
| Flexural modulus | 1600 MPa | ISO 178 |
| Notched Izod impact at 23 °C | 2.5 kJ/m² | ISO 180/A |
| Heat deflection temperature at 0.45 MPa | 95 °C | ISO 75-2/B |
| Vicat softening temperature A50 | 153 °C | ISO 306/A50 |
| Shore D hardness | 68 | ISO 868 |
The tabulated values are representative data from standardised specimens prepared under laboratory conditions. They are not specification limits and should not be used for design without part-specific validation. Properties such as tensile modulus and notched Izod impact are influenced by flow-induced orientation, cooling rate, and the location of the gate relative to the test specimen. In injection molded parts, the measured modulus can exceed the tabulated value by more than 10 % in the flow direction and fall below it in the transverse direction, depending on the degree of molecular orientation.
High-melt-flow polypropylene resins such as MOPLEN PP HP550J are more sensitive to barrel residence time than fractional-MFR grades because the shorter average chain length reduces the temperature required for chain scission to become process-visible. Melt temperature set points on injection molding machines with screw L/D ratios of 20:1 to 24:1 should be established between 230 °C and 250 °C. Plasticising capacity should be matched so that the material does not remain in the barrel for more than 5 min at melt temperature. Operation above 260 °C or prolonged hold at the upper limit can produce thermo-oxidative degradation products that appear as yellowing, gas splay, and a decrease in notched Izod impact. Mold temperature should be maintained between 30 °C and 50 °C. At relative humidity above 60 %, surface moisture on pellets can generate splay defects; pre-drying in a desiccant dryer at 80 °C for 2 h removes this moisture without significantly altering molar mass.
High-cavity thin-wall molds with valve-gated hot runners exhibit the largest processing advantage because melt viscosity controls the hot-runner pressure drop. In a 32-cavity mold with a target wall thickness of 0.8 mm, the melt flow rate of 50 g/10 min allows the injection pressure to be reduced relative to a 12 g/10 min homopolymer, but the exact pressure reduction is tool-specific and published data for this specific configuration is limited. The reduced melt viscosity permits shorter packing time and lower clamp force, yet it narrows the processing window for sink mark control in thicker ribs and bosses. Flow-front velocity in the thinnest section is typically held between 100 mm/s and 300 mm/s, and gate seal time must be verified by weight curve measurement on the production machine. Hot-runner temperature between 230 °C and 250 °C avoids premature freeze-off while minimising resin degradation in the manifold.
The primary difference between MOPLEN PP HP550J and a lower-flow homopolymer with a melt flow rate near 12 g/10 min is the lower melt viscosity and reduced chain entanglement density. Under ISO 1133-1:2022, the higher MFR directly increases spiral flow length at equivalent injection pressure and enables shorter holding pressure times. The trade-off appears in impact resistance: a lower-flow homopolymer typically shows notched Izod impact values of 4–5 kJ/m² at 23 °C per ISO 180/A, whereas HP550J is closer to 2.5 kJ/m² because the shorter chains have fewer effective entanglements to dissipate impact energy. This difference restricts HP550J from applications requiring snap-fit deflection or drop impact at sub-ambient temperatures.
When compared with a propylene random copolymer containing 2–4 wt% ethylene, HP550J shows higher tensile modulus and higher Vicat softening temperature but lower notched impact strength and higher optical haze. The homopolymer also exhibits a narrower sealing window in heat-seal applications because the absence of comonomer reduces the temperature interval between seal initiation and distortion. Relative to a heterophasic impact copolymer, HP550J is stiffer and exhibits a lower tendency to creep under continuous load, but it cannot match the impact copolymer’s low-temperature energy absorption. These differences are material-intrinsic and are not corrected by processing adjustments such as higher mold temperature or longer hold time.
Rheological behaviour at processing shear rates is shear-thinning. At 230 °C and apparent shear rates of 100 s⁻¹ to 1000 s⁻¹, the apparent viscosity of a 50 g/10 min homopolymer is substantially lower than that of a 12 g/10 min grade; published capillary rheometry data for this specific grade are limited. The power-law index is typical of narrow-molecular-weight-distribution polypropylene, and the onset of melt fracture in thin sections is suppressed relative to higher-viscosity grades because wall shear stress is reduced at equivalent volumetric throughput. This supports the use of small gate diameters and short land lengths in multi-cavity tools. However, low melt strength compared with high-molecular-weight blown film grades is a limitation in extrusion and thermoforming processes; HP550J is not recommended for deep-draw thermoforming or extrusion blow molding because parison sag becomes difficult to control.
Thin-wall food packaging such as dairy cups, margarine tubs, and disposable containers with wall thickness between 0.6 mm and 1.2 mm is a typical application. The material accepts high-speed injection with mold temperature down to 20 °C for near-ambient dimensional stability, though higher mold temperature improves crystallinity and reduces post-mold shrinkage. Unfilled polypropylene mold shrinkage is generally 1.0–2.0 % measured per ISO 294-4, depending on wall thickness, gate orientation, and packing pressure. Tool design must account for anisotropic shrinkage because flow direction shrinkage is lower than transverse shrinkage. Weld lines form downstream of core pins and should be located away from snap-fit or load-bearing regions. No post-mold annealing is required for service at ambient temperature.
The boundary for MOPLEN PP HP550J is most visible at low service temperatures. At 0 °C, the notched Izod impact of polypropylene homopolymer typically drops below 2 kJ/m² under ISO 180/A, while the tensile modulus rises. Components such as snap-fit closures, stackable crates, or luggage shells that experience point impact or flexure during assembly are therefore more likely to fail in brittle mode. In these cases, a heterophasic impact copolymer or a random copolymer is substituted even when the melt flow rate decreases and cycle time lengthens. The substitution changes hot-runner pressure demand, hold pressure profile, and mold shrinkage. Published data for this specific configuration is limited, but converter experience indicates that regrind blending of HP550J with impact copolymers reduces brittleness at the expense of melt flow and stiffness; the blend ratio must be tested for phase compatibility and delamination resistance.
For material handling, the pellets are normally used without pre-drying in controlled indoor environments below 50 % relative humidity. In coastal or humid plants, hopper dryers set at 80 °C for 2 h reduce surface moisture. Conveying line speed should be kept below 10 m/s to limit fines generation in high-speed thin-wall operations. Regrind usage is possible but should be limited to 20 wt% in food-contact articles unless the converter has validated higher loads for specific migration and mechanical properties. The same production line can process natural and additive masterbatch blends provided the dosing system maintains ≤ 1 % variation in the masterbatch feed rate.
Incoming quality control typically includes melt flow rate per ISO 1133-1:2022, density per ISO 1183-1, and tensile yield per ISO 527-2. Spectrophotometric colour is evaluated according to ASTM D6290 or internal CIELAB methods. For lot-to-lot consistency in thin-wall molding, converters monitor the melt flow rate within ± 10 % of the nominal value and notched Izod impact on dry-as-molded specimens per ISO 180/A. A shift of 5 g/10 min in melt flow rate can change injection pressure and gate seal time on hot-runner tools; therefore, any resin source change or visbreaking adjustment must be communicated before use.
Regulatory conformity is application-dependent and must be verified with the supplier’s regulatory information for the specific lot. Polypropylene homopolymer base resins are generally evaluated under FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011 for food-contact use, but the final article must meet overall migration and specific migration limits at the intended temperature and contact time. The product should not be used with strong oxidising agents, chlorinated solvents, or aromatic hydrocarbons at elevated temperatures unless specific chemical resistance data for the final part are available. Ultraviolet exposure degrades unstabilised polypropylene; outdoor applications require additional UV stabilisation. Avoid contact with copper or copper alloys at processing temperatures above 250 °C because copper ions accelerate thermo-oxidative degradation. These restrictions are operational boundaries and do not imply that the product is non-compliant with general polypropylene food-contact requirements.
