| HS Code | 537684 |
| Material | Polypropylene Random Copolymer |
| Melt Flow Rate Astm D1238 230 C 2 16 Kg | 18 g/10 min |
| Density Astm D792 | 0.900 g/cm³ |
| Tensile Strength At Yield Astm D638 | 29 MPa |
| Tensile Elongation At Yield Astm D638 | 10% |
| Flexural Modulus Astm D790 | 1100 MPa |
| Izod Impact Strength Notched Astm D256 23 C | 75 J/m |
| Heat Deflection Temperature Astm D648 0 45 Mpa | 95°C |
| Heat Deflection Temperature Astm D648 1 82 Mpa | 55°C |
| Vicat Softening Temperature Astm D1525 | 135°C |
| Rockwell Hardness Astm D785 | R85 |
| Haze Astm D1003 | 12% |
| Gloss 60 Astm D523 | 95 |
As an accredited MARLEX PP RG568MO factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARLEX PP RG568MO polypropylene resin is packaged in 25 kg sealed bags, ensuring moisture protection and safe handling. |
| Container Loading (20′ FCL) | 20′ FCL container loading of MARLEX PP RG568MO: polypropylene resin packed in bags on pallets, securely stowed, maximizing weight capacity. |
| Shipping | MARLEX PP RG568MO is a polypropylene resin supplied as solid pellets. It is classified as non-hazardous and not regulated for transport under IMDG, IATA, or DOT. Ship in clean, dry containers or lined bags, protected from moisture and excessive heat. Standard freight handling applies. |
| Storage | Store MARLEX PP RG568MO in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture, dust, and contamination. Avoid contact with strong oxidizing agents. Maintain moderate temperatures to preserve material properties. Use proper handling procedures and follow manufacturer safety guidelines. |
| Shelf Life | Shelf life is typically one year from shipment if stored in a cool, dry place away from direct sunlight and moisture. |
In thin-wall transparent food-contact packaging molded at nominal wall thickness 0.45–0.85 mm, Marlex PP RG568MO is dosed at 100 parts by weight, with a pelletized color masterbatch added at 1.5–3.0 wt% and a slip/antiblock masterbatch at 0.5–2.0 wt%; total non-polymer additive loading is held below 6.0 wt% so that the formulation remains aligned with the overall migration limit of 10 mg/dm² specified in EU Regulation 10/2011 and the olefin polymer clearance of FDA 21 CFR 177.1520. The injection molding cell is built around a 35:1 L/D single-screw reciprocator with a barrier screw diameter of 25–40 mm, a hot runner manifold balanced to ±2.0°C, and a mold chiller set to 15–25°C. Melt temperature is maintained in a 210–230°C window; operation above 235°C shortens the crystallization window and generates a measurable haze increase when 1.0 mm plaques are tested per ASTM D1003-21, while operation below 205°C produces short shots and weld-line cracks at the rim. Clamp force is set at 3.0–5.0 kN/cm² of projected area, with fill velocity profiled to complete cavity filling in 0.2–0.6 s before transfer to holding pressure of 40–70 MPa. Top-load resistance is checked at 23°C using a constant-rate compression fixture; mold temperatures above 25°C can reduce sidewall orientation and lower top-load stiffness, but published data for RG568MO at this exact wall-thickness combination is limited. Pellets are dried at 80°C for 2–4 h only when storage relative humidity exceeds 60%; unnecessary drying is avoided because surface moisture, not absorbed moisture, is the primary defect source in polypropylene. Terminal product types include clear deli containers, cold cups and thin-wall rectangular food-storage containers.
Shuttle blow molding cells processing RG568MO for medical reagent bottles operate on a neat-resin baseline, with 2.0–4.0 wt% amber or opaque masterbatch added when photoprotective labeling requires low light transmission. The converted part falls under FDA 21 CFR 177.1520 and EU Regulation 10/2011 for food and medical-contact olefins; when intended as primary packaging for diagnostic fluids, qualification under USP Class VI, ISO 10993-5:2009 for cytotoxicity and ISO 10993-10:2010 for irritation and sensitization is performed on the finished bottle, not on raw pellets alone. Process conditions use a continuous-shuttle extrusion blow molder with a 20–30 point parison programmer, melt temperature 190–220°C, blow pressure 0.6–1.0 MPa, and mold temperature 10–25°C. Residual moisture is kept below 0.02% by drying at 80°C for 2 h when open storage exceeds 48 h. Terminal products are 250–1,000 mL reagent bottles and diagnostic buffer containers. Regrind is excluded unless an ISO 13485 quality system validates a closed-loop regrind stream with no loss of clarity or impact.
For tamper-evident still drink closures, the compound is proportioned at 96–98 wt% RG568MO with 2–4 wt% color masterbatch; silicone-free mold release is limited to <0.05 wt% because higher silicone loadings reduce liner retention and create torque-variation failures on high-speed capping lines. Compliance for beverage contact uses EU Regulation 10/2011 and FDA 21 CFR 177.1520. Molding takes place in 72–96 cavity hot-runner tools on electric injection molding machines with 120–200 kN clamp force per cavity, melt temperature 230–250°C, mold temperature 10–18°C, and full cycle time 4.0–8.0 s. Dimensional checks are performed against ISO 1133-1:2022 melt flow release limits and ASTM D638-22 tensile yield at 50 mm/min for lot verification. The interference-bead stacking behavior is verified by cap-to-neck insertion force and removal torque; changes of 0.05–0.10 mm in bead radius on the mold steel can shift removal torque beyond target without any change in resin lot. Terminal product types include 28 mm and 38 mm closures for still water, juices and ambient-fill dairy beverages, where random copolymer is specified for lower crack susceptibility under cap thread hoop stress.
The heat-seal web in a three-layer cast film line uses 80–100 wt% RG568MO, 0–20 wt% ethylene-propylene-butene terpolymer for lower seal initiation, and 0.3–1.0 wt% synthetic silica anti-block masterbatch. The structure is governed by EU Regulation 10/2011 and FDA 21 CFR 177.1520 for food contact, with seal strength tested under ASTM F88/F88M-21 and hot tack under ASTM F1921-18. The conversion process uses a 30:1 L/D barrier screw extruder feeding a 1,200–2,000 mm flat die with a die gap of 0.5–0.8 mm; melt temperature is 230–260°C, air gap 10–20 mm, and chill roll temperature 15–25°C. The critical process conflict is edge neck-in and melt curtain instability when the seal layer is downgauged below 20 µm; maintaining a 12–20 µm seal web requires precise edge pinning and a melt curtain velocity of 30–60 m/min, otherwise gauge variation exceeds ±2.0% and seal initiation becomes non-uniform. The chill roll must remain below 35°C; roll temperatures above 35°C cause blocking and reduce hot tack, while roll temperatures below 10°C quench the film surface too rapidly and create internal haze. Terminal product types are heat-sealable lidding webs, flowrap food packaging films and overwrap films for frozen bakery trays.
| Conversion route | Primary standard for the claimed property | Critical control limit | Verification location |
|---|---|---|---|
| Thin-wall injection molding | ASTM D1003-21, ISO 294-1 | Melt nozzle 210–230 °C; mold 15–25 °C | Hot-runner nozzle thermocouple |
| Extrusion blow molding | USP Class VI, ISO 10993-5:2009 | Residual moisture below 0.02 %; melt 190–220 °C | Dryer outlet dew point |
| Cast film seal layer | ASTM F88/F88M-21, ASTM F1921-18 | Chill roll ≤ 35 °C; seal web 12–20 µm | Chill-roll infrared pyrometer |
| Thermoformed sheet | EU 10/2011, FDA 21 CFR 177.1520 | Sheet surface 140–165 °C at forming station | Mid-infrared sheet scanner |
During molding of ethylene oxide-sterilizable diagnostic assay cassettes and reaction tubes, RG568MO is used at 100 wt% virgin resin; no external slip, no antistatic masterbatch and no regrind are introduced because leachables from additive packages can shift fluorescence and absorbance baselines in diagnostic optical paths. The components are qualified under ISO 10993-5:2009 for cytotoxicity and ISO 10993-10:2010 for sensitization and irritation, with USP Class VI testing performed on the molded part after the intended sterilization cycle, not merely on raw pellets. Molding is performed on electric injection molding machines inside an ISO Class 8 cleanroom, with melt temperature 210–220°C, mold temperature 12–18°C, and dry-air conveying. Terminal products are diagnostic reaction cassettes, assay cartridge bodies and 0.5–2.0 mL sample tubes. Gamma sterilization above 25 kGy is not recommended because oxidative chain scission in polypropylene random copolymer can produce yellowing and molecular weight loss; ethylene oxide or electron-beam cycles below 25 kGy are the preferred compatibility envelope.
Sheet extruders running RG568MO for drink cups and thin-gauge trays dry blend 85–100 wt% RG568MO with 0–15 wt% PP homopolymer to raise flexural modulus without narrowing the forming window; 0.5–2.0 wt% color masterbatch is added at the hopper. The sheet is produced on a single-screw extruder with 30:1 L/D barrier screw, melt temperature 200–230°C, polished three-roll stack temperature 40–60°C, and sheet thickness 0.5–1.5 mm. Compliance is verified under EU Regulation 10/2011 and FDA 21 CFR 177.1520, and the resulting sheet is converted into cold-fill dairy and deli packaging. The forming station uses contact or vacuum thermoforming at a sheet surface temperature of 140–165°C; below 140°C the sheet does not fully reproduce cup rim details and can stress-whiten in corners, while above 165°C the sheet sags and wall thickness distribution becomes uneven. Terminal products are 100–350 mL drink cups, yogurt cups and deli trays. Published data for the exact dry-blend modulus at a given homopolymer level in RG568MO is limited; industrial practice is to verify top load and rim stiffness on the formed cup rather than predicting solely from resin datasheet modulus.
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MARLEX PP RG568MO is a high-flow random copolymer polypropylene supplied in pellet form for injection molding operations that require short cycle times, thin-wall filling, and controlled warpage. The producer’s technical datasheet lists a nominal melt mass-flow rate of 56 g/10 min at 230 °C under 2.16 kg load when measured in accordance with ISO 1133-1. Nominal density is reported as 0.900 g/cm³ under ISO 1183-1. These values place the grade in the upper melt-flow range of random copolymer polypropylene used for caps, closures, housewares, thin-wall food containers, and clear overcaps. The high flow value is a typical material characteristic and should not be interpreted as a lot-release specification.
Because the comonomer is distributed along the polypropylene backbone in a random copolymer structure, the crystallinity is lower than that of a PP homopolymer of comparable melt flow. The reduction in crystallinity lowers flexural modulus and tensile yield strength while improving optical clarity and reducing warpage in flat geometries. The grade is therefore positioned between high-stiffness homopolymer PP and high-impact heterophasic copolymer PP. Service behavior should be compared using ISO 527-2 tensile data, ISO 178 flexural data, and ISO 179-1 or ISO 180 impact data, rather than by melt flow alone.
| Property | Test standard | Typical value |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1 (230 °C/2.16 kg) | 56 g/10 min |
| Density | ISO 1183-1 | 0.900 g/cm³ |
| Tensile stress at yield | ISO 527-2 (50 mm/min) | 28 MPa |
| Tensile strain at yield | ISO 527-2 (50 mm/min) | 10% |
| Flexural modulus | ISO 178 (1.3 mm/min) | 1,100 MPa |
| Notched Izod impact at 23 °C | ISO 180/A | 6.0 kJ/m² |
| Vicat softening temperature | ISO 306/A50 | 128 °C |
| Haze on 1 mm plaque | ASTM D1003 | 8% |
Processing of MARLEX PP RG568MO is normally carried out on conventional single-stage injection molding equipment with screw diameters between 25 mm and 80 mm depending on shot weight. Screws with an L/D ratio of at least 20:1 and a compression ratio between 2.5:1 and 3.0:1 provide sufficient plastication without excessive shear heating. Melt temperatures should be held in the range 220–250 °C; barrel profiles with the nozzle at 220–230 °C and rear zone at 200–210 °C reduce the probability of discoloration. Mold temperatures of 20–40 °C are typical for thin-wall packaging. A closed-loop hot-runner system with independently controlled tips is advisable when multi-cavity tools exceed 16 cavities because flow imbalance in high-flow PP produces inconsistent gate-to-gate packing and increases part-mass variance.
Resin drying is not usually required for polypropylene at low ambient humidity. When hopper or storage conditions exceed 60% RH, pre-drying at 80 °C for 2 h in a desiccant-bed drier is recommended. Melt residence time should not exceed 5 min at 250 °C; extended residence at melt temperatures above 280 °C accelerates thermo-oxidative chain scission, causing viscosity loss, yellowing, and reduced mechanical properties. High shear rates in small gates can be tolerated because of the high melt flow; however, gate freeze-off is rapid, and a short hold-pressure time is required to avoid stuck sprues.
In thin-wall closure and container tools, the transition from filling to packing occurs close to gate freeze-off. The high melt flow of MARLEX PP RG568MO reduces injection pressure demand but also shortens the time available for hold-pressure transfer before gate solidification. For gate diameters of 0.6–0.8 mm in hot-runner systems, gate freeze time is typically short enough that pack pressure must be applied before the cavity pressure reaches its peak. Delayed switchover produces sink marks and shrinkage variation between cavities. Injection velocity should be validated on the production machine rather than assumed from a generic process sheet because velocity-dependent shear thinning is amplified in high-flow grades.
Back pressure of 3–7 bar is usually sufficient for homogenization. Screw speed should be limited to avoid melt temperature overshoot, particularly in all-electric machines with high plastication rates. A reverse-taper shutoff nozzle prevents drool during mold open. If the nozzle body is not thermally isolated, surface melt can cool below 200 °C and produce intermittent cold slugs in the next shot, which may increase the reject rate in high-cavitation tools.
Random copolymer PP grades exhibit a measurable drop in impact resistance as temperature decreases. For MARLEX PP RG568MO, the notched Izod value at 23 °C is useful for light-duty closures and ambient containers, but the absence of an elastomeric dispersed phase means that the grade should not be substituted for heterophasic impact copolymers in frozen-food packaging or automotive battery boxes. Published low-temperature impact data for this specific grade is limited; if service below 0 °C is required, design verification should include ISO 179-1/1eU or ISO 180/A measurements on molded plaques at the minimum use temperature. For thin-wall containers, the ductile-to-brittle transition is also influenced by wall thickness, gate type, and molecular orientation.
In cold-chain containers, a high-flow random copolymer can reduce injection pressure and cycle time, but the trade-off is lower low-temperature toughness. A heterophasic impact copolymer with an ethylene-propylene rubber phase provides higher energy absorption at −20 °C but usually has higher haze and lower flexural modulus. MARLEX PP RG568MO is therefore preferred only when optical clarity and short cycle time are prioritized over sub-zero impact resistance.
In multi-cavity closure molds, mold-filling simulation with producer viscosity data has shown that wall thicknesses of 0.4–1.2 mm can be filled at practical injection pressures when melt temperature is maintained in the upper end of the recommended range. The grade can be processed with hot-runner gate diameters of 0.6–0.8 mm for closures; smaller gates require excessive injection velocity and can generate surface defects. Mold shrinkage values for unfilled random copolymer PP are typically between 0.012 mm/mm and 0.016 mm/mm under ISO 294-4, but shrinkage is anisotropic and increases with wall thickness and hold-pressure reduction. For caps with internal undercuts, ejection force is minimized by using a draft angle of 1–1.5° and food-contact approved mold release agents; however, excessive mold release reduces printability and label adhesion.
Random copolymer PP is selected for clarity-sensitive packaging because irregular comonomer placement disrupts spherulitic crystallization. The optical haze of MARLEX PP RG568MO is reported in producer literature as approximately 8% on a 1 mm injection molded plaque using ASTM D1003. This value is influenced by mold temperature, cooling rate, and nucleating additives. Lower mold temperatures increase cooling rate and reduce crystallite size, which generally lowers haze but also increases frozen-in stresses. High-flow grades may incorporate a nucleating agent to accelerate crystallization and shorten cycle time; such nucleation can improve stiffness but may reduce impact strength if crystallite morphology becomes unfavorable. The producer datasheet should be checked for whether this grade contains a clarifier or nucleator, because the “MO” suffix may indicate a specific additive package rather than a base resin only.
For food-contact applications, the grade is expected to comply with FDA 21 CFR 177.1520 for olefin polymers and with European Union Regulation (EU) No 10/2011, subject to the migration limits applicable to the finished article. Specific organoleptic testing is often required by converters of low-odor packaging; high melt flow can contribute to higher volatile content if processing temperatures are excessive. Volatile content should therefore be measured using headspace GC-MS when the resin is run in high-temperature hot-runner systems above 250 °C.
Compared with a PP homopolymer of similar melt flow, MARLEX PP RG568MO typically exhibits lower flexural modulus, lower heat deflection temperature, and improved clarity. Compared with a heterophasic impact copolymer, it generally provides higher stiffness, lower haze, and lower sub-zero impact strength. The selection of this grade is therefore application-specific and should be validated by producing molded specimens from the actual production tool and testing them under the relevant standards rather than relying on generic data sheets alone.
When application requirements include drop resistance at −20 °C, the selection of MARLEX PP RG568MO should be challenged against heterophasic impact copolymers or blends. The product’s high melt flow and random comonomer structure provide lower energy absorption at sub-zero temperatures than an impact copolymer with a discrete rubber phase. In such cases, room-temperature notched impact data are misleading; low-temperature multi-axial impact testing on the actual container geometry is necessary. The test sequence should include conditioning of samples at −20 °C for 24 h, followed by drop impact on the finished part using an internal standard or a method similar to ASTM D2463.
If clarity at sub-zero temperatures is not required, a heterophasic PP impact copolymer with a melt flow of 20–40 g/10 min may provide better low-temperature ductility while retaining acceptable injection processing. If a clear container is required and only occasional freezer exposure occurs, the use of MARLEX PP RG568MO can be validated by controlling wall thickness, eliminating sharp corners, and avoiding internal stresses from excessive packing.
Regulatory and quality-control documentation for MARLEX PP RG568MO should include a certificate of analysis from the resin producer. Incoming resin testing at the converter should verify melt flow rate using ISO 1133-1 or ASTM D1238 condition L and density using ISO 1183-1. Spectroscopic verification of the random copolymer composition can be performed by FTIR or DSC; the melting peak of random copolymer PP is typically lower than that of homopolymer PP, often between 130 °C and 150 °C depending on comonomer content. This melting range can be used to detect cross-contamination with homopolymer PP or heterophasic impact PP in silos or conveying systems.
Post-consumer recyclate use in blends with MARLEX PP RG568MO should be approached only after the recyclate’s viscosity and contamination level are characterized. The high melt flow of the base resin may mask the lower melt flow of recycled material during plastication, but weld-line strength and odor may change. Blends containing more than 20 wt% recycled content should be revalidated for mechanical properties using ISO 527-2 and ISO 179-1 specimens, not inferred from melt flow data alone. Processing aids, slip agents, or antistatic additives should be tested for interaction with the base resin under ISO 1133-1 and ASTM D1003 before production approval because high-flow random copolymer formulations are sensitive to additive-induced haze increases.
