| HS Code | 990701 |
| Polymer Type | Polypropylene homopolymer |
| Density | 0.905 g/cm³ (ASTM D792) |
| Melt Flow Rate | 1200 g/10 min (230°C, 2.16 kg; ASTM D1238) |
| Melting Point | 163 °C (ASTM D3418) |
| Tensile Strength At Yield | 31.7 MPa (ASTM D638) |
| Elongation At Yield | 10.7% (ASTM D638) |
| Flexural Modulus | 1137 MPa (ASTM D790) |
| Notched Izod Impact Strength At 23 C | 21 J/m (ASTM D256) |
| Vicat Softening Temperature | 150 °C (ASTM D1525) |
| Heat Deflection Temperature At 0 45 Mpa | 100 °C (ASTM D648) |
| Rockwell Hardness | R-99 (ASTM D785) |
As an accredited MARLEX PP HG385MO factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARLEX PP HG385MO is packaged in 25 kg multi-wall paper bags, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | MARLEX PP HG385MO is loaded as a 20′ FCL, with polypropylene resin bags securely packed and containerized for safe transport. |
| Shipping | MARLEX PP HG385MO is a non-hazardous polypropylene homopolymer resin supplied in solid pellet form. It is packaged in 25 kg bags, octabins, or bulk hoppers and shipped via sealed containers or trucks. Keep dry and store away from heat sources. Handle carefully to avoid bag damage during transport. |
| Storage | Store MARLEX PP HG385MO in a cool, dry, well-ventilated area, away from direct sunlight, heat, and open flames. Keep containers tightly closed to prevent moisture contamination and dust accumulation. Avoid contact with strong oxidizing agents. Maintain good housekeeping to minimize static discharge, and follow local regulations for polymer storage and handling. |
| Shelf Life | Shelf life is indefinite when stored in original packaging, away from heat, sunlight, and moisture. |
Thin-wall dairy containers and related food packages converted from MARLEX PP HG385MO are processed on high-cavitation injection molding lines with clamp force typically between 2500 kN and 6500 kN. The grade is assigned a nominal melt flow rate of 35 g/10 min under ISO 1133-1:2022 at 230 °C and 2.16 kg. Melt temperature at the nozzle is held at 210 °C–240 °C for filling walls of 0.40 mm–0.55 mm without excessive gate blush. Mold surface temperature is maintained at 15 °C–30 °C because post-mold shrinkage in this segment is controlled largely by cooling rate; expected shrinkage is 1.0%–1.4% when measured by ISO 294-4. Packing pressure is set between 600 bar and 900 bar, with packing time of 0.3 s–0.8 s, depending on cavity-flow distance and wall section. A reverse taper nozzle with free bore of 2.5 mm–3.0 mm is used to prevent drool. The high-flow homopolymer displays a narrow practical processing window; melt temperature below 205 °C increases short-shot incidence in multicavity hot runner tools, while sustained barrel temperatures above 250 °C can cause yellowing and loss of surface gloss. Pigment loading is restricted to 2 wt%–4 wt% custom color masterbatch or 1 wt%–3 wt% titanium dioxide white masterbatch. No impact modifier is used because the sidewall requirement is stiffness rather than toughness; flexural modulus above 1400 MPa by ISO 178 must be retained. Terminal products include 150 mL–500 mL yogurt cups, 250 mL cream cheese tubs, and 350 g–750 g margarine containers. Food-contact compliance rests on FDA 21 CFR 177.1520 for polypropylene and EU 10/2011; overall migration is verified by EN 1186-1 with an oil-simulant limit of 10 mg/dm². Batch-to-batch MFR drift exceeding ±3 g/10 min is a known production bottleneck in this tool class because it alters fill time and short-shot margin across hot runner branches.
Caps and closures injection-molded from HG385MO are normally produced in 48- to 96-cavity cold runner tools with unscrewing or collapsing core ejection. Melt temperature for this segment is set at 220 °C–245 °C, while mold surface temperature is lowered to 10 °C–20 °C to minimize cycle time. Cooling below 10 °C is avoided because condensation on mold surfaces creates splay and gate-area defects. Holding pressure is maintained at 500 bar–700 bar for 0.5 s–1.0 s. The end form is a tamper-evident screw cap or snap-on overcap with an internal plug seal, usually in 28 mm or 30/25 mm neck finishes for still water, dairy beverages, and personal care jars. The mating surface requires slip modification for controlled removal torque; erucamide is dosed at 500 ppm–1200 ppm through a polypropylene-based masterbatch. Printed closures may also contain a non-silicone external lubricant at 0.2 wt%–0.5 wt%. Closure torque retention is screened by ASTM D2063 static torque retention testing, but the final bridge break torque is set by closure geometry rather than resin alone. The homopolymer structure limits environmental stress crack resistance; closures used with essential oil concentrates, aggressive cosmetic emulsions, or hot-filled contents above 80 °C should be qualified first by ISO 22088-2 stress cracking or ASTM D543 chemical resistance protocols. Compliance for food and personal care closures is evaluated under FDA 21 CFR 177.1520 and EU 10/2011, with specific migration of erucamide controlled by EU 10/2011 Annex II restrictions.
Table 1 aggregates converter-level processing windows for selected downstream segments of HG385MO.
| Segment | Melt temperature | Mold temperature | Holding pressure | Additive or restriction |
|---|---|---|---|---|
| Thin-wall dairy packaging | 210 °C–240 °C | 15 °C–30 °C | 600 bar–900 bar | 2 wt%–4 wt% color masterbatch; no impact modifier |
| Caps and closures | 220 °C–245 °C | 10 °C–20 °C | 500 bar–700 bar | 500 ppm–1200 ppm erucamide |
| Syringe barrels and diagnostic bodies | 220 °C–250 °C | 15 °C–30 °C | 700 bar–900 bar | No external processing aid; cleanroom handling |
| ESD component carriers | 200 °C–230 °C | 20 °C–40 °C | 400 bar–600 bar | 4 wt%–10 wt% conductive carbon black or 0.5 wt%–2 wt% CNT masterbatch |
Syringe barrels and diagnostic consumable bodies molded from HG385MO are processed in cleanroom injection cells meeting ISO 14644-1 Class 7 or better. The resin is used as supplied without external mold release, slip additive, or regrind because extractables and leachables must remain within USP 661.1 plastic packaging limits and ISO 10993-1 biological evaluation requirements. Melt temperature is held between 220 °C and 250 °C, with hot runner valve-gated tooling preferred to eliminate cold runner scrap. Mold temperature is maintained at 15 °C–30 °C using turbulent water flow. Syringe barrel wall sections of 0.8 mm–1.2 mm require holding pressure of 700 bar–900 bar and injection speed of 80 mm/s–150 mm/s to avoid sink marks at the luer lock. Dimensional control of the luer taper is checked against ISO 80369-1 small-bore connector geometry. Rapid cooling is critical for clarity; for a 1 mL syringe barrel, cooling time above 5 s tends to increase haze in the barrel wall. Terminal articles include 1 mL, 3 mL, and 5 mL syringe barrels, nasal spray actuators, and diagnostic cartridge bodies. Sterilization compatibility is validated by steam autoclave at 121 °C for 15 min or by ethylene oxide; repeated autoclave cycling above 121 °C or dry heat above 125 °C can produce dimensional relaxation in thin cross-sections and should be controlled by dimensional stability trials under ISO 7083 or equivalent production validation.
Ambient laboratory consumables such as test tube racks, petri dish carriers, and instrument bezels are the realistic application boundary for this high-flow homopolymer. Melt temperature is set at 210 °C–240 °C and mold temperature at 15 °C–25 °C. The absence of an impact-copolymer phase means notched Izod impact resistance remains below 2.5 kJ/m² at 23 °C by ISO 180/A and drops further below 0 °C. For racks stored at −20 °C, sidewall cracking has been observed on production parts when stacked under load; converters frequently run dynamic mechanical analysis by ASTM D5418 to identify storage modulus transitions before approving cold-room use. The grade should not be specified for −80 °C freezer boxes or cryogenic vial holders because impact failure occurs before practical ductile yield. For such low-temperature products an impact copolymer or elastomer-modified polypropylene is required. Additive restrictions for diagnostic-contact labware are similar to medical: no talc or surface lubricant is allowed if the articles contact reagents, because talc migration can shift optical density readings in plate readers. Terminal products are limited to benchtop racks, trays, and non-stressed containers that do not experience low-temperature impact.
ESD-safe component carriers and JEDEC trays are a separate downstream segment where HG385MO is compounded with conductive carbon black at 4 wt%–10 wt% or a carbon nanotube masterbatch at 0.5 wt%–2 wt%. The compounded melt flow rate drops relative to neat resin, so processing uses melt temperature of 210 °C–240 °C and mold temperature of 20 °C–40 °C. Back pressure is held below 0.5 MPa to limit shear heating and oxidative breakdown of the conductive filler network. Injection speed is moderate to reduce surface bloom of carbon black. The target surface resistivity range is 1 × 10⁴ Ω/sq–1 × 10⁹ Ω/sq measured by IEC 61340-5-1; this range is reproduced on semiconductor wafer shippers and PCB handling trays. Terminal products include JEDEC trays for QFP and BGA packages, hard disk drive component carriers, and reel assemblies for connector terminals. Compliance for this segment is driven by IEC 61340-5-1 and ANSI/ESD S20.20; no food-contact or medical certification is required. Pre-drying at 80 °C for 2 h is imposed when ambient relative humidity exceeds 60%, because residual masterbatch moisture above 0.05 wt% creates splay on tray surfaces.
Table 2 lists the main compliance anchors for the downstream segments described above.
| Downstream segment | Primary food-contact or medical standard | Supporting test method | Operating limit |
|---|---|---|---|
| Thin-wall dairy packaging | FDA 21 CFR 177.1520, EU 10/2011 | EN 1186-1, ISO 178, ISO 294-4 | Overall migration 10 mg/dm²; MFR drift ±3 g/10 min |
| Caps and closures | FDA 21 CFR 177.1520, EU 10/2011 | ASTM D2063, ISO 22088-2, ASTM D543 | Contact media below 80 °C unless stress cracking qualified |
| Syringe barrels and diagnostic bodies | USP 661.1, ISO 10993-1 | ISO 80369-1, ISO 8871-1 | Autoclave 121 °C; dry heat not above 125 °C |
| ESD component carriers | IEC 61340-5-1, ANSI/ESD S20.20 | Surface resistivity meter, IEC 61340-5-1 | 1 × 10⁴ Ω/sq–1 × 10⁹ Ω/sq |
| Small appliance housings | UL 94 HB | IEC 60695-11-10, ISO 899-1 | Continuous use below 60 °C unless creep validated |
Small appliance housings and external trims made from HG385MO are pigment-loaded parts produced with melt temperature of 220 °C–250 °C and mold temperature of 20 °C–40 °C. The grade meets UL 94 HB at 0.8 mm thickness but does not pass UL 94 V-2 without a flame-retardant masterbatch. Terminal products include rice cooker feet, refrigerator door caps, and iron soleplate shields; components exposed to continuous service above 60 °C require creep assessment by ISO 899-1.
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MARLEX PP HG385MO is a polypropylene homopolymer supplied in pellet form and classified by its nominal melt mass-flow rate of 35 g/10 min when measured at 230 °C under a 2.16 kg load in accordance with ASTM D1238 or ISO 1133-1. The density is 0.904 g/cm³ when determined by ASTM D1505 or ISO 1183-1. The product is positioned for high-speed injection molding of thin-wall articles, particularly caps, closures, housewares, and certain packaging and diagnostic consumables. Compared with lower-flow polypropylene homopolymers, HG385MO reduces injection pressure and permits higher cavitation because of the higher melt volume-flow response. Compared with heterophasic impact copolymers, it provides higher flexural modulus and higher heat deflection temperature at the expense of low-temperature impact toughness. The material is selected where the limiting technical requirements are flow length, dimensional stability, extraction resistance, and stiffness rather than sub-ambient impact or optical clarity.
Typical property data for injection-molded test specimens, conditioned at 23 °C and 50% relative humidity for 24 h unless otherwise stated, are shown in the following table.
| Property | Test method | Typical value |
|---|---|---|
| Melt mass-flow rate, 230 °C/2.16 kg | ASTM D1238 / ISO 1133-1 | 35.0 g/10 min |
| Density | ASTM D1505 / ISO 1183-1 | 0.904 g/cm³ |
| Tensile yield stress | ASTM D638 | 34.0 MPa |
| Tensile elongation at yield | ASTM D638 | 8% |
| Flexural modulus, 1% secant | ASTM D790 | 1,380 MPa |
| Notched Izod impact, 23 °C | ASTM D256 | 2.1 kJ/m² |
| Heat deflection temperature, 0.455 MPa | ASTM D648 | 104 °C |
| Vicat softening temperature | ASTM D1525 | 155 °C |
The values above are typical datasheet values and should not be read as release limits. Lot-specific certificates of analysis control actual melt flow rate and density. Users should establish statistical process control limits for incoming resin testing. Published data for this specific configuration are limited for multi-axial impact, environmental stress cracking, fatigue, and long-term heat aging of finished parts. Those properties must be evaluated on the final tool and article geometry under the applicable service conditions.
Material preparation and melt processing on reciprocating-screw injection machines. HG385MO may be processed directly from sealed bags when ambient relative humidity remains below 60%. If bags have been exposed to humid air, drying at 80 °C for 2 h in a desiccant dryer is recommended to reduce surface moisture and suppress splay. A barrel capacity of 3–5 times shot weight is typical. Screws with an L/D ratio of 20:1 to 24:1 and a compression ratio of 2.5:1 to 3.5:1 are suitable. Barrel temperature profiles are usually set in the range of 210 °C to 250 °C, with the feed zone at 180–200 °C and the metering zone/nozzle at 220–240 °C. Mold temperatures from 20 °C to 50 °C are employed; lower mold temperatures shorten cycle time, while higher mold temperatures improve surface gloss and reduce internal stress. Sustained melt temperatures above 270 °C accelerate thermo-oxidative chain scission and may cause melt flow drift, yellowing, and odor. Back pressure is normally maintained between 5 bar and 15 bar. Injection speed should be high for thin-wall parts to avoid premature freeze-off, but gate shear rates must be controlled. In hot-runner systems, frictional heating may raise the melt temperature by 5–15 °C above the manifold set point; therefore the upper set temperature should be derated accordingly.
Crystallization, shrinkage, and warpage. HG385MO is a semicrystalline homopolymer; the crystallization temperature and rate determine part stiffness and shrinkage. In differential scanning calorimetry at 10 °C/min, a typical homopolymer of this class shows a melting peak near 160–165 °C and a crystallization peak near 115–125 °C. Mold shrinkage is generally in the range of 1.0–1.5% in the flow direction and 1.0–2.0% across flow, depending on wall thickness, packing pressure, and mold temperature. For precision closures, gate freeze time must be determined by cavity pressure measurement rather than by machine timer settings. Inadequate packing can increase shrinkage variation and cause ovality in round parts. Post-mold annealing is rarely necessary for parts under 0.8 mm wall thickness, but for thicker sections a short annealing step at 100 °C may reduce residual stress. Warpage in flat diagnostic plates is often driven by non-uniform orientation and differential shrinkage between gate and edge. Adjusting injection speed and packing profile is usually more effective than increasing mold temperature.
The primary distinction is phase structure. HG385MO is a homopolymer; it contains no discrete ethylene-propylene rubber phase and no significant ethylene comonomer. This structure yields a flexural modulus of 1,380 MPa by ASTM D790 and a notched Izod impact of 2.1 kJ/m² at 23 °C by ASTM D256. A heterophasic impact copolymer of comparable melt flow rate typically has a flexural modulus closer to 1,100–1,300 MPa and a notched Izod impact of 6–15 kJ/m². The homopolymer is therefore stiffer and more dimensionally stable under load, but less capable of absorbing impact energy, particularly below 0 °C. Random copolymers with ethylene contents generally provide better clarity and lower seal initiation temperature; however, they typically have lower flexural modulus, lower heat deflection temperature, and lower yield stress. A random copolymer used for clear housewares may show a Vicat softening temperature in the range of 120–140 °C, while HG385MO has a Vicat softening temperature of 155 °C by ASTM D1525. These differences guide substitution decisions: replacing an impact copolymer with HG385MO in a hinged closure may reduce impact durability, while replacing HG385MO with a random copolymer in a high-temperature cap may reduce dimensional stability.
Injection molding of thin-wall closures and diagnostic consumables. HG385MO is used in high-cavitation molds where wall thickness is below 0.8 mm. The melt flow rate of 35 g/10 min permits shorter filling time and lower injection pressure compared with 12 g/10 min or 25 g/10 min homopolymer grades. In practice, cavity count and gate size must be balanced with shear heating and pressure drop. For a direct-edge gate closure with a wall thickness of 0.5–0.6 mm, melt temperature in the upper portion of the recommended range and mold temperature of 20–30 °C often produce acceptable gloss and roundness. After ejection, parts should be held at 23 °C and 50% relative humidity for at least 24 h before dimensional inspection because post-mold crystallization and physical aging can shift critical dimensions by several hundredths of a millimeter. Polypropylene homopolymer also has a linear coefficient of thermal expansion of approximately 100–150 × 10-6/°C; therefore dimensional checks at different ambient temperatures require correction. Continuous service above 90 °C may lead to antioxidant consumption and post-crystallization shrinkage. For sustained thermal exposure, the part must be tested under load and temperature, since the heat deflection temperature alone does not define the upper service temperature.
For food-contact applications in the United States, HG385MO is generally evaluated against FDA 21 CFR 177.1520, which covers olefin polymers and sets composition and use-condition expectations. In the European Union, the governing framework is EU Regulation No 10/2011, including its amendments, where the converter must verify overall migration and specific migration limits for the finished article under intended food-contact conditions. For medical and diagnostic packaging, the grade may be evaluated according to USP <661.1> for plastic packaging systems and ISO 10993-5 for in vitro cytotoxicity. The presence of antioxidants, acid neutralizers, and other additives in the product means that extractable profiles are formulation-dependent and may require chemical characterization under ISO 10993-18 when the article is part of a medical device. The converter is responsible for ensuring that masterbatches, regrind, mold-release agents, and processing conditions do not push the final article outside the applicable compliance envelope.
| Region/function | Standard or regulation | Typical scope |
|---|---|---|
| United States food contact | FDA 21 CFR 177.1520 | Olefin polymer composition and use conditions |
| European food contact | EU Regulation No 10/2011 | Overall migration and specific migration limits |
| Medical packaging | USP <661.1> | Plastic packaging system characterization |
| Biocompatibility | ISO 10993-5 | In vitro cytotoxicity evaluation |
Because HG385MO does not contain an ethylene-propylene rubber phase, its extractable profile generally begins from a simpler homopolymer base structure. This is not a guarantee of lower total extractables; the final profile depends on the stabilization package and on downstream contamination. In high-purity diagnostic consumables, preproduction rinsing and cleanroom molding may be required even when the resin certificate of compliance is valid.
In hot-runner molds with needle-valve systems, HG385MO can experience local melt temperature overshoot at the gate. A manifold set at 240 °C may deliver melt to the gate at 250–255 °C under high throughput. Process engineers should measure gate-area melt temperature or use mold-flow simulation with shear-heating inputs rather than relying solely on nozzle set points. The upper processing limit of 270 °C should not be exceeded. In medical or diagnostic molding, external mold-release sprays can introduce extractable compounds and should be avoided unless the release agent is fully characterized. If antistatic performance is required, the neat grade is not inherently antistatic and an antistatic masterbatch should be qualified. Published data for this specific configuration are limited for antistatic additive loadings above 2%, so compatibility, migration, and fogging evaluations are necessary. High mold temperatures combined with antistatic additives can also increase mold deposit formation on polished cores, requiring periodic cleaning.
Regrind handling and end-of-run behavior. HG385MO can be reprocessed as in-plant regrind, typically at levels up to 20% by weight, provided the regrind is dry, thermally stable, and free of contamination. Higher levels may increase melt flow rate and reduce impact. A rise in melt flow rate of more than 10% relative to virgin resin indicates excessive thermal history or oxidative degradation. Regrind should not be blended with polycarbonate, PET, PVC, or polar contaminants; such mixtures can delaminate and generate volatiles. For food-contact applications, the use of post-consumer recycled content must comply with FDA or EU Regulation No 10/2011 recycling provisions and is not automatically covered by the virgin resin compliance statement.
