| HS Code | 852529 |
| Density | 0.900 g/cm³ |
| Melt Flow Rate | 8.0 g/10 min at 230°C, 2.16 kg |
| Tensile Strength At Yield | 24 MPa |
| Elongation At Yield | 9% |
| Flexural Modulus | 900 MPa |
| Notched Izod Impact 23 C | 45 J/m |
| Melting Point | 145°C |
| Vicat Softening Temperature | 130°C |
| Heat Deflection Temperature 0 45 Mpa | 80°C |
| Rockwell Hardness | R80 |
| Haze | 0.5% |
| Gloss 45 | 85% |
As an accredited MARLEX PP RD208CF factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARLEX PP RD208CF is supplied as solid plastic pellets in 25 kg multilayer paper bags, stacked on shrink-wrapped pallets for transport. |
| Container Loading (20′ FCL) | 20′ FCL shipment of MARLEX PP RD208CF: palletized bags secured in container, ventilated, protected from moisture and heat for safe transport. |
| Shipping | MARLEX PP RD208CF is a polypropylene resin shipped as non-hazardous solid pellets. Transport in clean, dry containers, lined bags, or bulk hoppers to prevent contamination. Avoid prolonged heat, moisture, and ignition sources. Standard freight handling applies; no dangerous goods declaration required for this stable plastic material. |
| Storage | Store MARLEX PP RD208CF in a clean, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep original containers tightly sealed to prevent moisture contamination and dust pickup. Avoid stacking near vents or hot surfaces. Maintain moderate temperatures, and protect material from mechanical damage or prolonged outdoor exposure. |
| Shelf Life | MARLEX PP RD208CF polypropylene resin has indefinite shelf life when stored properly in dry, cool conditions away from sunlight. |
In monolayer cast film extrusion on high-speed horizontal form-fill-seal (HFFS) lines for fresh produce and bakery items, RD208CF is processed as the base polypropylene random copolymer at 100 parts per hundred resin, with additive masterbatches added by gravimetric dosing rather than by dry blending. The formulation for a 30 µm flow-wrap web typically incorporates 2.0–3.5 phr of a 5% synthetic silica anti-block masterbatch and 0.5–1.0 phr of an erucamide slip masterbatch, both carried in a polypropylene homopolymer compatible with the random copolymer matrix; dosing variation above 0.5 phr on the slip masterbatch is a known cause of coefficient-of-friction drift on HFFS jaw and belt feed systems, producing intermittent film mis-registration. The resin is fed to a single-screw extruder with a 90 mm diameter and 30:1 L/D barrier screw fitted with a Maddock mixing section, using a 60/100/60 mesh screen pack and a melt temperature of 230–245°C; the melt is cast through a slot die with a 0.6–1.0 mm lip gap onto a chill roll held at 20–28°C, followed by vacuum box and air knife pinning to limit gauge variation. Corona treatment is applied to 38–42 mN/m only when printing or lamination is required. The terminal product type is clear printed or unprinted flow-wrap film, lidding film, and produce bags, with compliance to FDA 21 CFR 177.1520 olefin polymers and EU Commission Regulation (EU) No 10/2011 overall migration limit of 10 mg/dm² under the intended food contact conditions.
Five-layer cast film structures for terminally sterilized medical device packaging use RD208CF as the skin sealant layer in a symmetric PP skin/tie/EVOH/tie/PP skin stack. The sealant skin is run at 100 wt% RD208CF without olefin dilution, but 1.0–2.5 wt% of a 5% synthetic silica anti-block masterbatch is added only to handle film unwind and sheet separation after corona treatment; exceeding 2.5 wt% creates a property cliff-edge in which haze under ASTM D1003 rises above 4% and seal strength under ASTM F88/F88M-21 shifts from cohesive seal tearing to adhesive interfacial failure. The skin layers are held at 15–25% of total gauge, the tie layers at 3–5%, and the EVOH oxygen barrier core at 5–10% depending on the oxygen transmission target. The production process uses five separate single-screw extruders, each with a 30:1 L/D barrier screw, feeding a combining feedblock and a single manifold slot die. The PP skin extruder melt temperature is set at 235–245°C, while the EVOH extruder is held at 220–225°C because the EVOH residence-time window is narrow; above 230°C for more than 8 min, gel formation becomes visible as lens-shaped inclusions in the clear PP skins. EVOH must be dried to below 0.01% moisture using a desiccant dryer at 80°C for 4 h before coextrusion. Melt flow rate is monitored under ISO 1133-1:2022 at 230°C/2.16 kg; for cast film edge bead control, random copolymer grades in this class are run with melt flow rate between 6 and 10 g/10 min, and lot-to-lot variation outside this window requires adjustment of die bolt settings. The die gap is maintained at 0.8–1.2 mm, and the cast web is quenched on a polished chill roll at 22–28°C with vacuum box pinning.
The processing conflict in this structure is that seal initiation of random copolymer PP improves when the skin reaches 120–130°C under ASTM F1921-20 jaw dwell, but thermally degrading the EVOH core by raising PP melt temperature above 245°C cannot be used to accelerate seal setup. Seal strength testing according to ASTM F88/F88M-21 is performed after ethylene oxide or hydrogen peroxide gas plasma sterilization, and the peelable opening mechanism is supplied by a separate peelable blend or coating, not by RD208CF alone; published seal curve data for the exact RD208CF/EVOH/RD208CF stack is limited, and a converter should generate seal curves on the actual line before committing to lot acceptance. Amine-based antistatic packages are excluded from the sealant skin because migratory amines interfere with seal strength after sterilization and introduce odor risk. The terminal product type is clear barrier pouches and lidding webs for single-use medical devices requiring ISO 11607-1:2019 packaging validation, with the polymer layer assessed under FDA 21 CFR 177.1520 and EU No 10/2011; final medical device packaging must also meet ISO 10993-5 cytotoxicity requirements on the finished system.
Pressure-sensitive adhesive coaters utilize RD208CF as a cast film backing of 30–50 µm thickness for clear office tape and self-adhesive label face stock when optical clarity and low gel count are required. The formulation is 97–100 wt% RD208CF with up to 3 wt% clean in-house edge reclaim, processed through a 100 mm single-screw extruder at a melt temperature of 230–245°C and a 0.6–1.0 mm slot die; the film is quenched on a matte or polished chill roll at 20–28°C and then corona-treated in-line to 40–44 mN/m. Surface energy decay between corona treatment and adhesive coating is a known production bottleneck; the film is typically coated within 24 h because wetting tension decays below 38 mN/m on stored film and causes adhesive anchorage failure under FINAT FTM 3 peel adhesion. The adhesive coating process uses water-based acrylic or solventless UV-cured pressure-sensitive adhesive applied at 18–30 g/m² wet, followed by drying or UV curing; the backing itself is evaluated for tensile elongation by ASTM D882 and for haze by ASTM D1003 before coating. The terminal product types are clear stationery tape, carton sealing tape, and label face stock; compliance for the polypropylene backing is covered by FDA 21 CFR 177.1520 and REACH Regulation (EC) No 1907/2006, while adhesive components fall under 21 CFR 175.105 for indirect food-contact labeling if required.
In stationery lamination applications, a 25–30 µm cast film of RD208CF is bonded to printed paper with a water-based polyurethane adhesive dry coat weight of 6–8 g/m²; the film is used at 100 wt% with no anti-block additive because post-corona surface energy of 40–44 mN/m must be maintained for adhesive wettability, and the finished product type is clear book covers, document folders, and report covers under REACH Regulation (EC) No 1907/2006 and, where applicable, EU No 10/2011 if food-contact declarations are transferred from the film supplier.
Confectionery twist-wrap operations convert RD208CF into a 25–30 µm cast film in which gauge uniformity and deadfold behavior determine wrapper performance more than additive loading. The formulation is 100 parts RD208CF with 1.0–2.0 phr food-grade glycerol monostearate-based antistatic masterbatch added only if static-induced film adherence is observed on high-speed twist-wrapping units; no hydrocarbon tackifier or migratory wax is introduced because these additives raise haze without improving twist retention. The film is produced by cast film extrusion at 230–245°C through a 0.6 mm die gap and quenched on a polished chill roll at 20–25°C to promote the rapid cooling required for print clarity; after slitting, the film is flexo- or gravure-printed on the corona-treated side at 38–40 mN/m. The terminal product type is twist-wrapped confectionery, chocolate, and boiled sweet wrappers, with polymer compliance to FDA 21 CFR 177.1520 and EU No 10/2011; printing inks and coatings must be separately verified under 21 CFR 175.300 or the applicable member state regulations.
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Marlex PP RD208CF is a clarified polypropylene random copolymer supplied by Chevron Phillips Chemical Company LP for high-clarity cast film and thin-gauge packaging applications. The published nominal melt mass-flow rate is 8.0 g/10 min when tested under ISO 1133-1:2022 at 230 °C and 2.16 kg; the equivalent North American method is ASTM D1238. Nominal density is 0.908 g/cm³ according to ISO 1183-1:2019. The ethylene comonomer content for this resin class is typically 2–4 wt%, which disrupts the regularity of the propylene chain and reduces overall crystallinity.
Because the ethylene is inserted randomly along the propylene backbone, the crystalline lamellae are thinner and less extensive than those in a homopolymer. That morphology lowers the seal initiation temperature, reduces flexural modulus, and improves contact transparency. It also means the grade does not contain a discrete rubber phase, a characteristic that distinguishes it from heterophasic impact copolymers. Lot-to-lot melt-flow variation is normally controlled within ±10% of nominal by the supplier, but processors should verify incoming resin with ISO 1133-1:2022 before running critical film structures. Published data for this specific configuration is limited for several secondary film properties; the following values are representative of the clarified random copolymer class and should be confirmed against the current supplier certificate of analysis.
On a cast film line, the resin is typically extruded through a coat-hanger or fishtail die with a die gap between 0.5 mm and 0.9 mm onto a polished chill roll maintained at 15–30 °C. The extruder should be a single-screw machine with an L/D ratio of 24:1–30:1 and a general-purpose polyolefin screw with compression ratio 2.5:1–3.5:1. Barrel temperatures are commonly set between 200 °C and 230 °C, with adapter and die temperatures from 230 °C to 250 °C to maintain melt curtain stability. The melt temperature measured at the die exit should remain below 250 °C to limit thermo-oxidative chain scission.
The melt curtain should be pinned to the chill roll with an air knife, vacuum box, or electrostatic pinning system. Inadequate pinning can produce uneven gauge, optical defects, and poor roll conformation. Chill roll surface finish and temperature directly affect film gloss and haze; mirror-polished rolls at lower temperatures generally reduce haze, although excessive cooling in humid conditions can create condensation defects. Chlorinated solvents, strong oxidizing acids, and certain low-molecular-weight oils can swell or stress-crack polypropylene, so end-use chemical compatibility should be tested under ISO 175:2010 before release of a commercial film structure.
Compared with a homopolymer polypropylene of similar melt flow, the random copolymer exhibits lower tensile modulus and tensile yield stress, but its seal initiation temperature is typically 10–15 °C lower and its optical haze is lower. The flexural modulus reduction relative to homopolymer is commonly 20–30% when measured by ISO 178:2019 on molded specimens; in film form, the machine-direction and transverse-direction secant modulus values are lower because the oriented crystalline phase is interrupted by ethylene units. These differences produce a softer film with easier low-temperature sealing and improved transparency.
Relative to a heterophasic impact copolymer, the clarified random copolymer lacks the discrete ethylene-propylene rubber domains that provide freezer-temperature impact strength but create light scattering and high haze. Impact copolymer film is tougher at low temperatures but is not suitable where low haze and high contact clarity are primary specifications. The random copolymer therefore occupies a position between high-clarity homopolymer and high-toughness impact copolymer. This distinction is measurable by ASTM D1003-21 haze testing and by ISO 180:2019 notched Izod impact testing on injection molded specimens.
Because the grade is formulated for cast film rather than biaxially oriented polypropylene, it is not expected to withstand high-stretch orientation as well as a dedicated BOPP grade. When higher modulus or improved barrier is required, the film can be incorporated as a sealant or skin layer in a coextruded structure, while a homopolymer or barrier resin forms the core. The layer ratio must be validated on the actual die block because additive migration between layers can shift the coefficient of friction and seal strength.
For a 25 µm monolayer cast film, the resin class typically shows haze values below 5% under ASTM D1003-21 and 60° gloss above 80 gloss units under ASTM D2457-13. These values are highly dependent on chill roll temperature, die gap, and air-knife setting. Tensile properties of film are measured using ISO 527-3:2018 or ASTM D882-18; typical machine-direction tensile stress at yield for random copolymer cast film ranges from 20 MPa to 30 MPa, and elongation at break is generally above 300%. Seal strength is evaluated by ASTM F88/F88M-21; the seal initiation temperature, defined as the temperature at which seal strength reaches 4.4 N/15 mm, normally falls between 105 °C and 120 °C. This is lower than homopolymer and allows reduced sealing energy on packaging lines.
Elmendorf tear resistance is measured by ASTM D1922-15, and dart drop impact by ASTM D1709-16a. These values depend on film thickness, chill roll conditions, and molecular orientation. For cast film of 25–30 µm, dart drop values in the range 150–300 g are common for the clarified random copolymer class, but the failure mode can shift from brittle puncture to ductile stretching depending on cooling rate. Slip and antiblock additives are normally added by the converter or through a formulated masterbatch; the base resin is generally not supplied with high levels of migratory slip agents. Static and kinetic coefficients of friction should be measured by ASTM D1894-14 on the finished film structure.
The differential scanning calorimetry melting peak for a propylene-ethylene random copolymer of this class is typically between 125 °C and 145 °C when measured under ISO 11357-3:2018. This is 15–25 °C below the melting peak of a polypropylene homopolymer. The lower melting peak corresponds to a broader heat seal window and reduced thermal resistance. Continuous service above 80–90 °C under load is not recommended because the random copolymer softens and may distort. The resin is not inherently resistant to prolonged ultraviolet exposure unless a suitable UV stabilizer masterbatch is added.
Optical haze is critically dependent on the cooling rate. Rapid quenching on a cold chill roll produces a fine crystalline structure that lowers haze but can increase brittleness in the transverse direction. A chill roll temperature of 15–25 °C is common for high-clarity film, while a temperature above 35 °C may increase haze and reduce machine-direction modulus. The balance between optical clarity and tear resistance should be established on the production line with ASTM D1003-21 and ASTM D1922-15 data collected at multiple chill roll settings.
The melt flow rate of 8.0 g/10 min indicates moderate molecular weight suitable for stable cast film extrusion without excessive draw resonance. Higher melt flow rate grades tend to flow more easily but may exhibit more severe draw resonance and reduced melt curtain stability. Lower melt flow rate grades may provide higher melt strength but require higher barrel temperatures and may limit line speed. The choice of this grade for cast film therefore balances melt curtain stability, seal initiation temperature, and film optical quality.
For food-contact film, the base resin is generally evaluated against FDA 21 CFR 177.1520 and EU Commission Regulation (EU) No 10/2011 as amended. Actual compliance statements are converter- and end-use-specific because overall migration and specific migration limits depend on film thickness, layer combination, food simulant, and contact temperature. Electrical and electronic applications are screened under RoHS Directive 2011/65/EU as amended by (EU) 2015/863 for lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. REACH obligations under Regulation (EC) No 1907/2006 require documented SVHC screening at the article level for substances above 0.1% w/w.
| Regulatory Framework | Typical Assessment | Relevant Code or Standard |
|---|---|---|
| United States food contact | Base resin compliance for olefin polymers | FDA 21 CFR 177.1520 |
| European Union food contact | Overall migration and specific migration limits | EU Regulation (EU) No 10/2011 |
| EU chemicals regulation | REACH SVHC screening at article level | Regulation (EC) No 1907/2006 |
| Electrical and electronic equipment | Restricted substances evaluation | RoHS Directive 2011/65/EU as amended by (EU) 2015/863 |
For pharmaceutical packaging applications, plastic packaging systems may require additional evaluation under USP <661.1>. The actual requirements depend on the dosage form and the regulatory filing. Converters should obtain the supplier’s current food-contact statement and lot-specific certificate of analysis before making commercial claims. Avoid blending the resin with incompatible high-melting polymers that can form gel particles in thin cast film; such gels are visible as optical defects and can reduce seal integrity.
When the resin is processed at line speeds above 100 m/min, the melt curtain may exhibit draw resonance, a periodic thickness oscillation caused by the interaction between extensional viscosity and rapid cooling. For this 8.0 g/10 min random copolymer, reducing the die-to-chill-roll gap, increasing melt temperature within the 240–250 °C range, and maintaining uniform pinning force reduce draw resonance. Draw resonance is best monitored with an online capacitance or beta gauge that records thickness variation at frequencies below 10 Hz.
Seal integrity at high line speeds is affected by cooling rate and film flatness. Rapid quenching produces a fine crystal structure that may lower the seal initiation temperature but can reduce transverse-direction tear resistance. Heat seal curves generated according to ASTM F88/F88M-21 should be measured across the web width because edge cooling often produces different seal performance from the center. Film gauge variation above ±5% can produce weak seal areas and package leakers.
| Process Variable | Typical Starting Range |
|---|---|
| Barrel temperature | 200–230 °C |
| Adapter and die temperature | 230–250 °C |
| Melt temperature at die exit | 220–250 °C |
| Chill roll temperature | 15–30 °C |
| Die gap | 0.5–0.9 mm |
| Air knife pressure | 0.1–0.5 bar |
| Line speed | 50–150 m/min |
Die lip cleanliness is critical because degraded polypropylene at the lip can form die drool and transfer to the film surface as gel particles or black specks. A purge with low-melt-flow polypropylene or a commercial barrel-cleaning compound is recommended during shutdown and grade changes. In multi-layer cast film structures, RD208CF is often used as the sealant or skin layer because its comonomer content provides a low seal initiation temperature, while a homopolymer may be used in the core for stiffness. The layer ratio should be validated on the actual die block because migration of additives between layers can alter film coefficient of friction and seal strength.
