| HS Code | 722603 |
| Density | 0.908 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 8.0 g/10 min |
| Tensile Stress At Yield | 35 MPa |
| Tensile Strain At Yield | 11 % |
| Flexural Modulus | 1300 MPa |
| Charpy Impact Strength 23 C Notched | 4.0 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 85 °C |
| Vicat Softening Temperature 10 N | 153 °C |
| Melting Temperature | 162 °C |
| Elongation At Break | >50 % |
As an accredited MOSTEN PP Homopolymer FC 108 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MOSTEN PP Homopolymer FC 108 is supplied in 25 kg multi-wall paper bags, palletized and stretch-wrapped for safe handling and transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of MOSTEN PP Homopolymer FC 108: 20-foot container, bulk or bagged polypropylene pellets, secure, dry, ventilated. |
| Shipping | MOSTEN PP Homopolymer FC 108 is a polypropylene homopolymer resin, supplied as solid pellets. It is not classified as dangerous goods under IMO/ADR/IATA regulations. Ship in clean, dry containers or bags, avoiding moisture and contamination. No special hazard labeling required; protect from excessive heat and direct sunlight during transit. |
| Storage | Store MOSTEN PP Homopolymer FC 108 in a cool, dry, well-ventilated area, protected from direct sunlight, heat, and ignition sources. Keep in original sealed packaging to prevent moisture pickup and contamination. Avoid contact with strong oxidizers. Maintain moderate humidity and temperature, and follow good housekeeping to minimize dust accumulation and static discharge risk. |
| Shelf Life | Store in original packaging under dry, cool conditions. Shelf life is typically 12 months from delivery date. |
In biaxially oriented polypropylene film production, MOSTEN PP Homopolymer FC 108 is processed into a cast base sheet that is subsequently oriented in machine and transverse directions. Barrel zone temperatures are set between 230 °C and 250 °C, and the flat die is maintained at 245 °C to 255 °C to keep melt viscosity within the draw resonance-free window. The cast sheet is solidified on a chill roll held at 15 °C to 25 °C; if the roll surface falls below 15 °C, condensation creates optical defects, while surface temperatures above 30 °C permit spherulite growth that increases haze after orientation. The sheet is reheated and drawn in the machine direction at 120 °C to 145 °C with draw ratios from 4.5:1 to 5.5:1, then stretched in the transverse direction at 155 °C to 170 °C with draw ratios from 8:1 to 10:1. Annealing at 150 °C to 165 °C with 2% to 4% relaxation reduces free shrinkage measured at 135 °C for 20 min under ASTM D1204 to below 5% in both directions. The grade-specific melt flow rate stated in the FC 108 certificate of analysis must be verified by ISO 1133-1 at 230 °C under a 2.16 kg load, because lot-to-lot drift beyond ±1 g/10 min can shift gauge spread and orientation stability. On 20 µm film, tensile strength measured by ASTM D882 typically ranges from 120 MPa to 160 MPa in the machine direction and from 200 MPa to 280 MPa in the transverse direction, while haze measured by ASTM D1003 remains below 2% only when the melt is filtered through a 200-mesh screen pack and additive masterbatch dispersion is adequately maintained. The continuous use of reclaimed FC 108 flake above 20 wt% without upgrading screen-pack mesh increases gel count and produces optical defects detectable by camera systems. For direct food contact, compliance with FDA 21 CFR 177.1520 and EU Regulation 10/2011 is mandatory, and overall migration under EN 1186-1 must not exceed 10 mg/dm²; published data for this specific FC 108 formulation across all food simulants is limited and must be verified lot by lot.
| Regulatory reference | Test method | Boundary condition |
|---|---|---|
| EU Regulation 10/2011 | EN 1186-1 overall migration | ≤ 10 mg/dm² |
| FDA 21 CFR 177.1520 | Extraction per 21 CFR 176.170 | Food-specific or simulant-specific end-testing required |
| REACH Regulation (EC) No 1907/2006 | Article 2(9) polymer exemption | Monomer residues below substance-specific thresholds |
Raffia tape lines processing MOSTEN PP Homopolymer FC 108 typically use a single-screw extruder with L/D 30:1 and a flat die gap of 0.6 mm to 0.8 mm. The quench bath is maintained at 30 °C to 40 °C; water carryover above 1 wt% on the tape before the first draw stand causes steam-induced microvoids that reduce tape tenacity measured according to ISO 527-3. After slitting, the tape is drawn in a hot-air oven at 130 °C to 145 °C with a draw ratio of 6:1 to 8:1, and final elongation at break is held between 15% and 25% on a 50 mm gauge length. Die pressure stability is strongly affected by calcium carbonate masterbatch addition above 5 wt%, which raises apparent viscosity and produces melt pump pressure fluctuations exceeding ±1.5%. These fluctuations translate into tape grammage variation above ±3%, measurable by cutting 1 m tape lengths and weighing on a balance calibrated to 0.001 g. Incorporation of reclaimed FC 108 regrind is limited to 10 wt% unless a 120 µm melt filter is installed; otherwise, unmelted gels or agglomerates pass into the slit tapes and reduce tenacity. The drawn tape used for woven sacks requires a tenacity of at least 4 cN/dtex and shrinkage after exposure to 130 °C for 10 min below 2%. Water-bath temperature control is critical because uneven quench across the tape width produces differential crystallinity and irregular fibrillation during the stretching step.
At the cast film die exit, the melt curtain of MOSTEN PP Homopolymer FC 108 is pinned to a polished chill roll by an air knife, and the roll surface temperature is controlled between 20 °C and 28 °C. Roll temperature deviations above 30 °C raise optical haze above 1.5% under ASTM D1003, while temperatures below 15 °C create condensation that becomes visible as antiblock void defects after slitting. Cast film thickness normally ranges from 30 µm to 80 µm, and thickness uniformity is monitored by a beta gauge; the gauge profile must remain within ±3% of target because thicker edges create hard roll sections and later gauge bands during winding. Slip and antiblock masterbatches are added at 1 wt% to 2 wt% to control surface friction, and the coefficient of friction is measured by ISO 8295 at 23 °C after 24 h conditioning. Drying is not normally required for FC 108 because homopolymer PP has low equilibrium moisture uptake, but if silo storage relative humidity exceeds 60%, surface condensation on pellets may justify hopper drying at 70 °C for 2 h before extrusion. Melt temperature must be limited to 250 °C during cast film extrusion because oxidative chain scission above this threshold lowers molecular weight and increases extractable oligomer content. The resulting cast film is used in packaging, stationery, and lamination substrates where heat-seal initiation is not required from the FC 108 layer; published data for this specific configuration in high-barrier cast film structures is limited and should be validated on production-scale lines.
Staple fibre production from MOSTEN PP Homopolymer FC 108 requires the melt to be filtered through a 40 µm screen and metered to spinnerets by a gear pump with discharge pressure held within 2 bar of the setpoint to limit denier drift. Extruder barrels are set from 210 °C to 240 °C, and melt temperature at the spin pack is maintained at 245 °C to 255 °C; below 240 °C the melt viscosity is too high for uniform fibre attenuation, while above 260 °C oxidative chain scission can reduce molecular weight and lower fibre tensile strength. Spinneret hole diameters of 0.4 mm to 0.7 mm and capillary L/D ratios of 2:1 to 4:1 are common, and the melt pump speed must be controlled within ±0.5 min⁻¹ to keep filament denier within ±2% of target. The fibres are draw-oriented at solid-state temperatures of 100 °C to 130 °C with draw ratios of 2.5:1 to 4:1, yielding fibre tenacity of 3.0 cN/dtex to 4.5 cN/dtex and elongation at break of 150% to 300% according to ISO 5079. For nonwoven conversion, carded webs are thermally bonded at 150 °C to 165 °C; the bonding window is narrow because homopolymer PP has a sharp melting endotherm between 160 °C and 165 °C by ISO 11357-3 differential scanning calorimetry, and temperatures only 5 °C above the onset cause melt flow that collapses the fibre structure. At subzero temperatures, homopolymer PP fibre becomes brittle, and applications requiring ductile behaviour below -10 °C are not recommended for this grade without impact modification.
Thin-wall injection moulding of MOSTEN PP Homopolymer FC 108 is constrained by flow length and freezing rate. Melt temperatures between 220 °C and 250 °C, injection pressures of 70 MPa to 120 MPa, and holding pressures of 40 MPa to 70 MPa are used when wall thickness is between 0.8 mm and 1.2 mm. Mould temperature is maintained at 20 °C to 40 °C, and cooling time dominates the cycle when the wall thickness is below 1.0 mm. At wall thickness below 0.6 mm, the flow length to wall thickness ratio can exceed 250:1, and material entering the mould at the low end of the temperature range may freeze before complete filling, producing short shots. In packaging closures and thin-wall containers, flexural modulus measured by ISO 178 on 80 mm × 10 mm × 4 mm bars typically falls between 1,200 MPa and 1,500 MPa for homopolymer PP, but grade-specific FC 108 data from the lot certificate must be used for mould-filling simulation. Notched Izod impact strength measured by ISO 180/A at 23 °C is typically below 4 kJ/m², so drop-impact performance in cold conditions is limited. Injection moulding process tolerances for FC 108 are broad in comparison with fibre and film processes, but batch-to-batch variation in melt flow rate still requires adjusting shot size and cushion position when lot MFR deviation exceeds ±1 g/10 min from the reference used to optimise the process.
Thermal bonding of nonwoven webs produced from MOSTEN PP Homopolymer FC 108 fibres depends on the position of the melting endotherm and the crystallisation rate after the calender nip. Differential scanning calorimetry under ISO 11357-3 shows a melting peak between 160 °C and 165 °C; calendered bonding at 150 °C to 165 °C permits fibre surface softening without complete loss of web thickness. If the calender roll temperature is raised by more than 5 °C above the melting onset, the fibre structure collapses and the nonwoven loses bending stiffness, measurable as a drop in bending length under ISO 9073-7. Tensile strength and elongation of the bonded nonwoven are measured under ISO 9073-3, and production-scale lines typically require cross-direction tensile strength above 10 N/50 mm for hygiene applications, though this threshold depends on basis weight and bond area. Homopolymer PP webs produced from FC 108 exhibit high surface resistivity and may accumulate static charges above 10¹² Ω; static dissipation equipment is required during slitting and winding to avoid web wander and roll blocking. Because the homopolymer has no comonomer interruption in crystallisation, the bonding window is narrower than that of random copolymer PP, and the use of chilled calender rolls below 15 °C can freeze the web before sufficient bond area develops. The operational boundary for this application is therefore defined by a rapid transition from insufficient bond strength to film-like compaction, and published data for this specific FC 108 configuration in high-speed spunbond lines is limited.
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MOSTEN PP Homopolymer FC 108 is a polypropylene homopolymer extrusion grade supplied under the MOSTEN trademark by Unipetrol RPA. The polymer is characterised by a nominal melt flow rate of 8.0 g/10 min when determined at 230 °C under a 2.16 kg piston load in accordance with ISO 1133-1:2022. Its density is approximately 0.905 g/cm³ by ISO 1183-1. The grade is intended for cast film extrusion, particularly for packaging, stationery, adhesive tape backing, and print lamination webs where high stiffness, low shrinkage, and low gel-induced optical defect levels are required. Because the polymer is a homopolymer, the crystalline phase is composed almost entirely of isotactic polypropylene, with a melting temperature near 160–165 °C and a Vicat softening temperature near 155 °C under ISO 306/A50. This contrasts with propylene-ethylene random copolymers, which contain low-melting ethylene sequences that reduce seal initiation temperature but also lower flexural modulus and upper service temperature. The following sections define the specification benchmarks, extrusion-boundary conditions, optical limitations, and comparative differences relevant to FC 108.
Table 1 lists representative values from the producer technical bulletin for FC 108. These values are typical values and not specification limits; lot-to-lot variation is controlled by internal release testing. Mechanical values were determined on injection-moulded ISO 527-2 Type 1A specimens conditioned at 23 °C and 50 % relative humidity for 88 h per ISO 291.
| Property | Test method | Typical value |
|---|---|---|
| Melt flow rate | ISO 1133-1:2022 | 8.0 g/10 min |
| Density | ISO 1183-1 | 0.905 g/cm³ |
| Tensile stress at yield | ISO 527-2 | 35 MPa |
| Tensile strain at yield | ISO 527-2 | 9 % |
| Tensile modulus | ISO 527-2 | 1550 MPa |
| Flexural modulus | ISO 178 | 1450 MPa |
| Charpy notched impact, 23 °C | ISO 179-1/1eA | 3.0 kJ/m² |
| Vicat softening temperature, A50 | ISO 306 | 155 °C |
| Heat deflection temperature, B | ISO 75-2 | 95 °C |
The combination of a flexural modulus of 1450 MPa and a notched Charpy impact of 3.0 kJ/m² places FC 108 in the high-stiffness, low-roughness class of PP homopolymers. The low Charpy value is a direct consequence of the absence of a dispersed elastomer phase; therefore, impact at 0 °C or below is sharply reduced, and the grade is not recommended for frozen-food packaging that requires drop-impact resistance without a lower sealing layer of polyolefin plastomer or random copolymer.
On a production-scale cast film line using a 90 mm single-screw extruder with a 30:1 L/D ratio and a 1200 mm flat die, the barrel temperature profile for FC 108 is typically set from 180 °C at the feed throat to 240 °C at the metering section, with melt temperature at the die lip maintained between 230 °C and 250 °C. A die gap between 0.4 mm and 0.6 mm is used for films from 20 µm to 120 µm. The air gap is normally held below 25 mm to limit neck-in and edge bead formation. Chill roll temperature is controlled between 18 °C and 30 °C; lower temperatures within this band suppress spherulitic crystal growth and reduce haze, but can increase condensation risk when ambient dew point exceeds 12 °C and may raise electrostatic charge density sufficiently to disturb winding tension. Higher chill roll temperatures above 35 °C tend to increase crystallinity and haze, reduce film toughness, and promote differential shrinkage in the transverse direction. Line trials on a specific die and chill-roll stack are required to establish the maximum stable line speed and the exact air-gap setting, because draw resonance onset is influenced by die-lip gap, melt temperature, and air-gap length. At a nominal 50 µm thickness, cast film from FC 108 commonly exhibits haze below 3 % by ASTM D1003 when quench conditions are optimized, although specific values depend on masterbatch type and surface embossing.
The optical performance of FC 108 in cast film is governed primarily by quench rate, melt homogeneity, and the size distribution of surface-defect nuclei. Rapid cooling on a chill roll at 18–22 °C produces a microcrystalline or smectic surface morphology with reduced light scattering; slower cooling permits the growth of α-spherulites with dimensions approaching the wavelength of visible light, which raises haze. The melt flow rate of 8.0 g/10 min relative to injection-moulding grades reduces the ability of the melt to relax oriented chains before crystallization, so die-lip cleanliness and polished roll surfaces are critical. Particulate contamination from regrind and unwetted additive agglomerates produces gel-like optical defects; the polymer should be processed with closed-loop drying of regrind and filtration through a screen pack of 120–200 mesh when regrind content exceeds 20 %. The use of nucleating agents is not required for FC 108 and may alter the crystallization half-time in a way that shifts the optimum chill roll temperature; published data for the effect of nucleating additives on FC 108 is limited.
MOSTEN FC 108 is not a heat-seal grade. Its seal initiation temperature is above 140 °C, derived from the stiffening onset of the homopolymer crystalline phase, whereas propylene-ethylene random copolymers used as sealant webs typically seal in the 120–135 °C range under ASTM F88 with dwell times below 0.5 s. In multilayer cast film, FC 108 is therefore placed in the core or print layer, with a random copolymer or a polyolefin plastomer used as the sealing skin. If FC 108 is used alone in a mono-layer film, heat sealing requires either elevated jaw temperatures above 150 °C with a risk of film distortion, or the use of a lacquer, cold-seal adhesive, or acrylic coating. Compliance with European food-contact regulation EU 10/2011 and FDA 21 CFR 177.1520 must be verified against the final additive package and film structure; the base homopolymer is generally compliant with olefin polymer listings, but specific migration limits for antistatic and slip additives must be assessed in the intended food simulant. The grade is not inherently UV-stabilized, and outdoor exposure will cause chain scission and surface embrittlement unless a hindered-amine light stabilizer system is incorporated.
Draw resonance in FC 108 cast film lines appears as a periodic variation in film thickness along the machine direction, typically in the frequency range of 0.5–5 Hz when polymer output is maintained constant. The phenomenon occurs when the draw ratio between the die exit and the chill roll exceeds a critical value determined by the rheological relaxation spectrum of the polymer. For PP homopolymer with a narrow molecular weight distribution and an MFR of 8.0 g/10 min, the critical draw ratio is generally lower than for broad-MWD or long-chain branched polypropylenes. Reducing the air gap, increasing melt temperature within the permitted 230–250 °C band, or increasing die gap raises the critical draw ratio. However, increasing die gap may reduce transverse gauge uniformity and raise edge trim. A practical upper line speed on a 1200 mm die with 50 µm film is not fixed by the resin alone; it depends on die-lip geometry, chill-roll position, and winding tension. Published data for FC 108 at specific draw ratios is limited, so process windows are established by line trials with a scanning gauge system capable of detecting thickness periodicity.
Incoming lots of FC 108 are typically released against a specification that includes melt flow rate, ash content, tensile stress at yield, flexural modulus, and colour. Incoming inspection at the converter should verify the MFR by ISO 1133-1:2022 and residual moisture by Karl Fischer titration or equivalent. Because polypropylene homopolymer has low equilibrium moisture absorption, drying is not mandatory at relative humidity below 60 %. However, if the pellets are stored in an unheated warehouse with RH above 80 % or mixed with wet regrind, surface moisture can generate splay and bubble defects in film. When drying is required, a desiccant dryer set to 80 °C for 2–3 h is sufficient to reduce surface moisture below 0.05 % by weight. Prolonged drying above 95 °C can cause pellet agglomeration and should be avoided. The resin feed zone of the extruder should remain below 80 °C to prevent premature bridging and feed instabilities.
Compared with a low-MFR biaxially oriented PP homopolymer grade such as a nominal 3 g/10 min BOPP resin, FC 108 has lower melt viscosity and lower melt strength, making it less suitable for sequential biaxial stretching at high transverse draw ratios above 7:1. Its higher MFR improves flow distribution in thin-gauge cast film but reduces the strain-hardening response needed for bubble stability in blown-film processes. Compared with a propylene-ethylene random copolymer, FC 108 is approximately 30–40 % higher in flexural modulus measured by ISO 178 and has a Vicat softening temperature 20–30 °C higher under ISO 306/A50, but has a higher seal initiation temperature and lower Elmendorf tear resistance by ISO 6383-2 in the slit film edge. Compared with a heterophasic block copolymer, FC 108 exhibits lower Gardner impact and notched Charpy values, especially below 0 °C, but lower wide-angle haze and higher flexural modulus; this differentiates its use in print webs, tape backings, and packaging where optical uniformity and dimensional stability are dominant, rather than in luggage or automotive parts requiring impact tolerance. These distinctions are comparative and based on typical homopolymer, random copolymer, and heterophasic PP property ranges; exact values for competitor grades must be confirmed with their producer data sheets.
Adhesive tape backing made from FC 108 requires a corona treatment level of at least 38 mN/m for solvent-based acrylic adhesive anchorage, measured by ASTM D2578. The film is usually stretched in the machine direction at low draw ratios below 4:1 to impart a degree of fibrillar orientation that increases tensile strength along the tape path. The homopolymer surface oxidizes readily under corona discharge, but treatment decays over time; lamination or coating should proceed within 24 h of corona treatment to maintain acceptable adhesion. This application exploits the higher flexural modulus of FC 108 compared with random copolymers, providing the required tensile strength at tape thicknesses of 30–60 µm. The coefficient of friction of the reverse side is controlled by slip additives and must be matched to the converting equipment; specific values for FC 108 are not fixed by the base resin and require masterbatch qualification.
Crystallization of FC 108 is fast compared with random copolymers. In differential scanning calorimetry at a cooling rate of 10 K/min per ISO 11357-3, the crystallization peak for PP homopolymer typically appears near 115–125 °C; for random copolymers it is lower. The chill-roll contact time must therefore be long enough to remove both sensible and latent heat before the film leaves the roll. On a roll of 800 mm diameter, contact length can be extended with a secondary roll or a water bath to ensure the film temperature drops below the heat distortion temperature of about 95 °C before edge slitting. If slitting occurs while the film is above 90 °C, the amorphous tie chains retain sufficient mobility to produce ragged edges and dust, which later contaminate printing and sealing operations.
At a die lip temperature of 240 °C, the shear rate in a 0.5 mm die gap at typical cast film throughputs is in the range of 500–1000 s⁻¹. Within this shear-rate band, the apparent shear viscosity of a PP homopolymer with an MFR of 8.0 g/10 min is sufficiently shear-thinning to permit uniform melt distribution across the die manifold while retaining enough viscosity to prevent edge tear and sag. Capillary rheometry according to ISO 11443 can be used to measure the flow curve for the specific lot; the entrance pressure drop should be subtracted using orifice die data if the melt is used for process simulation. Variations in MFR of ±0.5 g/10 min within the release band can shift the die pressure by 5–10 % and should be accounted for in gauge-control algorithms.
In a twin-screw compounding operation where a slip or antiblock masterbatch is added to FC 108, the main screw speed should be set to limit specific mechanical energy input below 0.25 kWh/kg to avoid viscous heating and chain scission. Thermal degradation of PP homopolymer on a production line becomes measurable as an increase in MFR above the release band and a decrease in elongational viscosity; therefore, online melt pressure and offline MFR checks after each 8 h shift are recommended. Melt temperatures above 280 °C for more than 5 min can cause chain scission and gel formation from stabilizer consumption; these degradation products produce black specks in film and die-lip deposits that require line stoppage for cleaning. Back-pressure control with a screen changer is used to maintain melt homogeneity; pressure drop across a clean 120–200 mesh screen pack is typically below 50 bar but rises with contamination and must be monitored.
Compliance with REACH regulation EC 1907/2006 and RoHS Directive 2011/65/EU is not automatic by polymer type alone; the producer’s extended safety data sheet and product compliance declaration must be consulted. For food-contact use, the grade may be evaluated under EU 10/2011 with specific migration testing according to EN 1186 and EN 13130 series. The base homopolymer is usually covered by FDA 21 CFR 177.1520, but any colorant, slip, antistatic, or antioxidant masterbatch added by the converter must have its own compliance status. Additives migrating into food simulants can exceed overall migration limits if the film is used above 100 °C or with fatty food simulants such as olive oil or 95 % ethanol. The intended use must therefore be defined before legal compliance is claimed.
