| HS Code | 501197 |
| Product | REPOL PP Homopolymer SS35N |
| Melt Flow Index | 35 g/10 min (230°C, 2.16 kg) |
| Density | 0.90 g/cm³ |
| Tensile Strength At Yield | 35 MPa |
| Elongation At Break | 10% |
| Flexural Modulus | 1600 MPa |
| Izod Impact Strength Notched 23 C | 3 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 110 °C |
| Vicat Softening Point | 155 °C |
| Melting Point | 165 °C |
| Rockwell Hardness | R105 |
As an accredited REPOL PP Homopolymer SS35N factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | REPOL PP Homopolymer SS35N is packaged in 25 kg polypropylene woven bags, palletized and wrapped for secure transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading of REPOL PP Homopolymer SS35N, polypropylene resin, packed securely for safe transport. |
| Shipping | REPOL PP Homopolymer SS35N ships as non-hazardous plastic resin pellets. Protect from moisture, direct heat, and UV exposure. Use clean, dry containers or lined bags. Avoid dust generation; ground equipment to prevent static discharge. Store in a cool, ventilated area away from oxidizers. Ensure proper labeling and secure palletization for safe transport. |
| Storage | Store REPOL PP Homopolymer SS35N in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep packaging sealed to prevent moisture contamination and dust accumulation. Avoid prolonged UV exposure and store separately from oxidizing agents. Maintain stable temperatures to preserve resin quality and flow properties. |
| Shelf Life | Shelf life is 12 months from manufacture when stored in original, unopened packaging in a cool, dry place. |
REPOL PP Homopolymer SS35N is specified for thin-wall injection moulded food-contact articles where a nominal melt flow class of 35 g/10 min at 230°C/2.16 kg under ISO 1133-1:2022 permits cavity filling at reduced injection pressure. On production lines using reciprocating screws with L/D 22:1 to 25:1 and compression ratios of 2.0:1 to 2.5:1, the material flows into wall sections below 0.50 mm without requiring melt temperatures beyond 250°C. Nozzle settings are held at 230–250°C, while mould surface temperature is controlled between 15°C and 35°C to stabilise frost-free clarity or pigmented opacity. Hold pressure is adjusted to gate freeze but typically remains within 40–70 MPa hydraulic pressure on tools with two to eight cavities. The processing window is narrow at the upper melt temperature boundary; residence time beyond 8 min at 250°C can produce visible yellowing and a shift in MFR of more than 2 g/10 min. Colour masterbatch based on a compatible PP carrier is added at 2–4 wt%, while slip or antistatic concentrates are introduced at 0.5–1.5 wt% only after verification of migration behaviour under the intended food-contact condition. Compliance of finished articles rests on EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm², and on FDA 21 CFR 177.1520 for olefin polymers used in contact with food. The converter must also document good manufacturing practice under 21 CFR 174.5 and verify that colourants and processing aids do not exceed specific migration limits listed in Annex II of EU Regulation (EU) No 10/2011. Terminal parts include dairy cups, takeaway lids, fruit punnets, delicatessen containers, and disposable soup bowls. The high-flow homopolymer is not recommended for retort conditions above 121°C because unfilled PP homopolymer exhibits heat distortion and warpage on flat lids exceeding acceptable dimensional tolerances. Published data for this specific configuration is limited for high-temperature sterilisation above 100°C; each tool must be verified with filled containers under plant-specific steam cycles.
| Regulation/standard | Scope | Verification criterion |
|---|---|---|
| EU Regulation (EU) No 10/2011 | Plastic food contact materials | Overall migration limit 10 mg/dm²; specific migration limits per Annex II |
| FDA 21 CFR 177.1520 | Olefin polymers for food contact | Compliance with extractables and use-condition limitations; GMP under 21 CFR 174.5 |
| Directive 2011/65/EU | RoHS restricted substances | Lead 0.1 wt%, cadmium 0.01 wt%, mercury 0.1 wt%, hexavalent chromium 0.1 wt% |
| Regulation (EC) No 1907/2006 | REACH SVHC screening | No substance of very high concern above 0.1 wt% in the supplied article |
High-flow PP homopolymer is applied in tamper-evident closures for ambient-filled bottled water, dry food jars, and personal care containers where cycle time reduction is driven by high-cavitation tooling. On 48-cavity to 96-cavity hot-runner moulds, melt temperature is maintained at 230–250°C, while mould cooling water is set between 10°C and 25°C to freeze gate vestige without excessive closure ovality. Cycle times of 4–7 s are achievable when valve-gate sequencing prevents flow hesitation in the tamper band region. Dimensional stability in the tamper-evident band depends on mould temperature uniformity; differential shrinkage greater than 0.15 mm across the closure diameter causes removal torque variation outside the internal pack performance specification. Erucamide-based slip masterbatch is let down at 1–2 wt%, and colour masterbatch at 2–3 wt%, with the overall additive loading limited to avoid screw recovery loss. Compliance with EU Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520 applies for closures in contact with dry or aqueous foods, but extraction tests must reflect the actual closure weight-to-food contact surface ratio. The grade is not the primary choice for carbonated soft drink closures because long-term stress crack resistance is lower than PP random copolymer grades; for carbonated beverage applications, converter validation under internal CO₂ retention and environmental stress cracking protocols is mandatory, and published data for this specific PP homopolymer configuration is limited. Terminal parts include still water closures, tamper bands, spice jar caps, and cosmetic flip-top bases. Gate blush at the side-gate entrance is reduced by using gate diameters of 0.6–0.8 mm and injection velocities of 100–180 mm/s, but optimum settings must be established on each hot-runner manifold. The low-temperature impact boundary of unfilled PP homopolymer must be considered if closures are stored below 0°C; the tamper band may fracture during removal at sub-zero distribution conditions.
Drying of REPOL PP Homopolymer SS35N is omitted in most housewares and consumer durables production when sealed silo storage keeps moisture content below 0.1%. If bulk bags are exposed to relative humidity above 60% for more than 24 h, the material is dried at 80°C for 2 h in a dehumidifying dryer before injection moulding. Houseware components such as modular storage drawers, kitchen drawer dividers, and refrigerator door shelves are moulded at melt temperatures from 220°C to 250°C, with mould temperatures between 20°C and 50°C depending on surface gloss requirements. High-gloss mould surfaces combined with mould temperatures above 40°C reduce visible flow lines on long flat areas, but increase cycle time by 10–15% compared with lower mould temperatures. The material is used where stiffness and light weight are more important than sub-zero toughness; notched Charpy impact strength under ISO 179-1/1eA for unfilled PP homopolymer of this MFR class is typically in the range 2.0–3.0 kJ/m² at 23°C, and drops steeply below 0°C. Thus freezer-grade storage boxes and drawers intended for operation below -5°C require impact modification or a copolymer grade. Food-contact housewares must meet EU Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520; repeated-use articles need verification of overall migration after three successive aqueous and fatty simulant contacts. Geometry-specific sink marks at rib intersections are controlled by rib thickness not exceeding 50% of nominal wall thickness, and by holding pressure profiles of 30–50 MPa for 5–8 s. Regrind from clean in-house scrap is incorporated up to 15 wt% in non-cosmetic areas, but higher regrind levels reduce surface gloss and shift melt viscosity toward higher MFR. Terminal parts include stackable home storage modules, cutlery trays, drawer organisers, and refrigerator door shelves. The homopolymer grade is not recommended for direct contact with boiling water above 100°C for extended periods because creep and heat distortion under load can cause warpage in long flat panels. Published data for this specific application configuration confirms general processing stability, but lot-to-lot MFR variation should be checked per ISO 1133-1:2022 before high-gloss production runs.
Industrial pails, agricultural crates, and material-handling containers are processed from REPOL PP Homopolymer SS35N when a stiff, ambient-temperature packaging structure is required and part weight reduction justifies the use of a high-flow grade. In these applications, the low-viscosity melt fills ribs and corner sections, but weld lines at handle openings and core pins become the controlling failure sites. Injection moulding is performed on machines with clamp forces from 250 tons to 800 tons, using melt temperatures of 220–240°C and mould temperatures of 20–40°C. Multiple gates are positioned to move weld lines away from pail bail ears and crate stacking corners; if weld lines remain in load-bearing regions, drop impact at -10°C can cause brittle fracture in unfilled PP homopolymer. The regrind limit is set below 20 wt% because each heat history raises MFR through chain scission. If the MFR after one reprocessing pass increases by more than 2 g/10 min under ISO 1133-1:2022, the regrind fraction is reduced to below 15 wt% to maintain drop-impact consistency. Stacking strength of pails is evaluated under ISO 12048 or equivalent transport packaging compression protocols, not by material tensile data alone. UN certification for liquid pails under ADR/RID requires drop, leak-proofness, and stacking tests on the finished container; the material itself does not provide automatic UN approval. The processing window during fast filling of thick rim sections must include hold pressure of 35–55 MPa for 8–15 s to avoid sink marks on pail rims and crate edges. Terminal products include 5 L to 25 L industrial pails, ventilation crates, fish crates, and stackable logistics boxes. Because the unfilled homopolymer has relatively low low-temperature impact strength, outdoor storage in cold climates below -10°C can produce brittle failure if unsupported point loads are applied. The material is therefore assigned to ambient distribution and light industrial storage rather than heavy-duty frozen logistics applications. Published data for this specific configuration demonstrates acceptable stacking stiffness at room temperature, but long-term outdoor ageing and repeated drop performance must be validated on the actual part geometry.
Appliance components such as washing machine detergent dispensers, dishwasher cutlery baskets, and refrigerator accessories are produced from PP homopolymer SS35N where the unfilled resin contributes stiffness and chemical resistance against detergent solutions. Melt temperature is controlled at 230–250°C, and mould temperature at 30–50°C to reduce visible flow lines on front-loading appliance drawers. The material fills thin grid sections in cutlery baskets at wall thicknesses from 0.7 mm to 1.2 mm, but ejection requires uniform shrinkage because thin cross-rib sections can warp beyond 0.8 mm on long parts if mould cooling is asymmetric. For parts not carrying electrical current, UL 94 HB classification is typical at a test thickness of 1.5 mm. However, unattended appliance applications falling under IEC 60335-1 may require glow wire resistance at 750°C under IEC 60695-2-11 for parts that retain current-carrying components or sit within a defined distance of connections. Unfilled PP homopolymer generally does not pass 750°C glow wire without flame-retardant modification because the material burns and continues to glow after the wire is removed. If glow wire compliance is required, a halogen-free flame-retardant masterbatch is added at 20–35 wt%, but this addition changes MFR, flexural modulus, and processing stability. The compounded formulation must be revalidated under ISO 1133-1:2022 for melt flow and under ISO 178 for flexural modulus. Terminal parts include detergent dispenser trays, lint filter frames, refrigerator shelf supports, and dishwasher basket clips. Detergent resistance testing under ISO 175 is recommended for parts exposed to alkaline wash liquors at 60–95°C; unpigmented PP homopolymer has general resistance to many aqueous detergents but can stress-crack in the presence of certain non-ionic surfactants when moulded-in stress is high. Annealing at 100°C for 30 min after moulding reduces internal stress in thick-walled sections, but adds an additional processing step. Published data for this specific configuration indicates that unfilled PP homopolymer can replace more expensive engineering plastics in non-structural appliance parts only when thermal and flame requirements fall within the specified limits.
Masterbatch and compound producers use REPOL PP Homopolymer SS35N as a carrier resin for colour concentrates and additive masterbatches destined for PP injection moulding and extrusion. The high 35 g/10 min carrier melt flow improves wetting of pigments and mineral fillers in twin-screw compounding equipment with L/D 40:1 to 52:1. Barrel temperatures are profiled from 180°C in the feed zone to 230°C at the die, with vacuum venting maintained below 0.03 MPa absolute to remove volatiles and moisture. Organic pigment loadings of 20–40 wt%, inorganic pigment loadings of 40–60 wt%, and carbon black loadings of 35–45 wt% are practical with this carrier, depending on pigment oil absorption and dispersive screw configuration. Calcium carbonate or talc-filled masterbatches at filler loadings up to 70 wt% can be produced, but above 75 wt% the melt strength of the high-flow carrier may be insufficient for strand pelletising. Underwater pelletising is preferred over strand pelletising when filler loading exceeds 60 wt% because strand breakage becomes a production bottleneck. Carrier letdown in the final PP compound is controlled by the required active ingredient concentration, typically resulting in 1–5 wt% masterbatch addition during injection moulding. The carrier itself must comply with REACH registration under Regulation (EC) No 1907/2006 and with Directive 2011/65/EU RoHS substance restrictions if the masterbatch is used in electrical or electronic applications. Migration-limited additives such as antistats or slip agents are evaluated under EU Regulation (EU) No 10/2011 if the final PP article is food-contact. The high-flow carrier is not suitable for high-speed blown film masterbatch applications requiring low MFR and high melt strength; a lower-flow PP carrier is selected instead. Terminal products include colour masterbatch pellets, antioxidant stabiliser masterbatches, antifibrillation concentrates for PP tape lines, and flame-retardant masterbatches for appliance components. Published data for this specific carrier configuration confirms good dispersion in twin-screw compounding, but screw speed, feed rate, and specific energy input must be revalidated for each pigment grade to prevent agglomerates above 5 µm in the final dispersion.
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Supplied by Reliance Industries Limited under the REPOL trade name, REPOL PP Homopolymer SS35N is a homopolymer polypropylene resin specified for high-speed spunbond nonwoven production. The grade designation places the material in the spunbond homopolymer family; the suffix N conventionally indicates a nucleated formulation, although the exact additive package should be confirmed on the producer’s certificate of analysis. The nominal melt mass-flow rate is 35 g/10 min when tested at 230 °C with a 2.16 kg piston load in accordance with ISO 1133-1:2022; ASTM D1238-23 reporting uses the same temperature and load condition. Density is typically within the 0.895–0.910 g/cm³ range under ISO 1183-1:2019. The homopolymer structure contains no ethylene comonomer; consequently, the resin provides higher crystallinity and heat resistance than random copolymers but lower crack resistance at subzero temperatures than impact copolymers. The primary conversion route is continuous filament spinning, draw-down, and thermal bonding into webs of 8–150 g/m² basis weight. Because the 35 g/10 min melt flow is approximately three times that of standard injection-molding homopolymers in the 11–14 g/10 min range, the melt enters a lower-viscosity regime suitable for fine-filament attenuation without the capillary breakup characteristic of meltblown grades above 400 g/10 min.
Spinline stability in spunbond depends on the balance between extensional viscosity and draw-down force. A 35 g/10 min homopolymer exhibits lower shear viscosity than a 12 g/10 min injection grade but retains sufficient melt strength to stabilize the filament under spinline strain rates of 10³–10⁴ s⁻¹. At 230 °C and 100 s⁻¹, apparent shear viscosity for the 35 g/10 min homopolymer class typically falls between 120 Pa·s and 180 Pa·s. The molecular weight distribution is controlled for fiber extrusion; a narrower distribution reduces low-molecular-weight fractions that migrate to the spinneret face and initiate hard deposits. In contrast, an injection-molding homopolymer in the 11–14 g/10 min range requires a higher melt temperature or greater screw torque to reach equivalent die throughput, and its higher extensional viscosity increases spinline stress at the same draw ratio. A meltblown resin above 400 g/10 min attenuates to finer fibers but may generate excessive shot and filament breaks on spunbond equipment because its melt strength is insufficient for long quench chambers and high-velocity draw-down air. SS35N therefore occupies the intermediate viscosity window: melt pressure on a 30:1 L/D single-screw extruder remains stable at die temperatures of 230–250 °C, while spinneret pressure drop stays within a range that avoids capillary starving on multi-hole spinnerets.
At the extruder, a barrier screw with a 30:1 L/D ratio and a melt pump is used. A typical extruder profile begins at 180 °C in the feed zone and rises to 230–240 °C at the adapter; melt temperature above 250 °C accelerates oxidative chain scission and carbonyl formation, which raises spin pack pressure and can cause filament breaks. Melt filtration through a 40–60 µm screen pack removes agglomerates; a pressure drop across the screen changer that rises above 120 bar generally precedes gel blockage of spinneret holes. Polypropylene is not hygroscopic, but surface condensation from cold storage can introduce water into the melt pump. Pellets are therefore dried at 80–90 °C for 2–4 h when ambient relative humidity exceeds 60 % or when hopper temperature is below the dew point. The hopper is maintained at 40–60 °C to suppress bridging. Draw-down air temperature and quench chamber pressure are set by line geometry rather than by resin properties; however, the resin’s narrow molecular weight distribution provides stable filament diameter when air velocity is adjusted to maintain a draw ratio of 200:1 to 400:1.
Mechanical property expectations follow the homopolymer class. Under ISO 527-2:2012 tensile testing at 50 mm/min, injection-molded or compression-molded plaques from a 35 g/10 min homopolymer typically exhibit tensile stress at yield of 30–38 MPa and tensile strain at yield of 7–10 %. Flexural modulus under ISO 178:2019 commonly falls between 1400 MPa and 1800 MPa. Vicat softening temperature under ISO 306:2022, method A50, is generally 150–155 °C, and heat deflection temperature under ISO 75-2:2013 at 0.45 MPa is approximately 100–110 °C. Notched Izod impact under ASTM D256-23 at 23 °C is typically low, usually 20–30 J/m, which confirms the homopolymer is not suited to low-temperature impact service. These values are class-representative; the producer’s lot certificate and specification limits take precedence for acceptance testing.
| Property | Test method | Typical range |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 35 g/10 min nominal; lot spread commonly 32–38 g/10 min |
| Density | ISO 1183-1:2019 | 0.895–0.910 g/cm³ |
| Tensile stress at yield | ISO 527-2:2012 | 30–38 MPa |
| Tensile strain at yield | ISO 527-2:2012 | 7–10 % |
| Flexural modulus | ISO 178:2019 | 1400–1800 MPa |
| Vicat softening temperature A50 | ISO 306:2022 | 150–155 °C |
| Heat deflection temperature at 0.45 MPa | ISO 75-2:2013 | 100–110 °C |
| Notched Izod impact at 23 °C | ASTM D256-23 | 20–30 J/m |
Nonwoven fabric properties are not inferred directly from resin tensile data. A 50 g/m² spunbond web produced on a Reicofil line with calender roll surface temperatures of 140–150 °C and embossing nip pressures of 60–80 N/mm² requires fabric tensile, elongation, and tear testing under ISO 9073-3 and ISO 9073-4 because fiber bond development and web uniformity control final strength. Resin lot changes within the 32–38 g/10 min melt flow envelope can shift the bonding window by 2–5 °C; therefore, calender roll temperature should be re-optimized against peel strength or tensile strength after lot transitions.
Substitution of a random copolymer with SS35N increases web stiffness and heat resistance because the homopolymer lacks ethylene comonomer and develops higher crystallinity. Differential scanning calorimetry at 10 °C/min under ISO 11357-3:2018 typically records a melting peak of 160–165 °C for homopolymer polypropylene, compared with 125–145 °C for many random copolymers. This shifts the bonding window upward and reduces blocking at storage temperatures above 50 °C. The trade-off is lower clarity and reduced low-temperature impact strength; homopolymer spunbond is hazy or opaque, whereas random copolymer can yield clearer film-fiber laminates and bicomponent sheath materials. In steam sterilization at 121 °C, SS35N retains dimensional stability better than a random copolymer because the Vicat softening temperature is above 150 °C. For applications that must withstand impact below −20 °C, an impact copolymer or reactor blend is required; SS35N is not designed for frozen-impact service and should not be selected for structural packaging or automotive interior parts where ductile failure below freezing is a requirement.
Regulatory status for unmodified polypropylene homopolymer is well established. Food-contact grades fall under FDA 21 CFR 177.1520 and EU Regulation 10/2011 if the finished article passes migration testing in the intended food simulant. RoHS Directive 2011/65/EU and REACH SVHC obligations apply to articles placed on the EU market; SS35N is not formulated with heavy-metal heat stabilizers and must be verified against the supplier’s SVHC disclosure. For medical spunbond, ethylene oxide and electron-beam sterilization are generally compatible with polypropylene homopolymer, but the converter must validate sterilant residue and mechanical property retention on the finished device. Published data for this specific configuration is limited for gamma irradiation above 25 kGy; extended gamma exposure can cause chain scission, yellowing, and embrittlement, so electron beam or ethylene oxide is preferred for high-dose sterilization.
Regrind addition up to 20 wt% is commonly practised on spunbond lines, provided the regrind is kept free of incompatible polymers such as polyethylene terephthalate and polyamide. The melt flow may increase by 1–3 g/10 min per pass if regrind is hot and oxidative degradation occurs; therefore, extruder melt temperature should remain below 250 °C and nitrogen blanketing of the feed hopper is recommended. Avoid combining SS35N with peroxide masterbatches intended for controlled rheology adjustment; uncontrolled chain scission can push melt flow above 50 g/10 min and produce filament breaks. The resin should not be exposed to strong oxidizing acids, aromatic hydrocarbons, or chlorinated solvents at elevated temperatures during purging or cleaning, and equipment should be purged with a lower-viscosity polypropylene or polyethylene purge compound before shutdown to avoid black specks on restart.
Lot acceptance for SS35N is normally based on melt mass-flow rate, ash content, and tensile yield stress. Melt flow is measured by capillary rheometry at 230 °C/2.16 kg and reported as grams per 10 min; ash content is determined by muffle furnace oxidation at 600–700 °C and should remain below 0.05 % by mass for nonwoven fiber production. Intrinsic viscosity or gel permeation chromatography may be used to monitor molecular weight distribution when spinline breaks persist across multiple lots. Acceptance decisions require combined review of resin rheology, quench air stability, and calender bonding response rather than reliance on a single resin property.
