| HS Code | 157860 |
| Product | RANPELEN PP Terpolymer SFC-750D |
| Manufacturer | LG Chem |
| Material Type | Polypropylene Terpolymer |
| Melt Flow Rate | 7.0 g/10 min (230°C/2.16 kg) |
| Density | 0.90 g/cm³ |
| Tensile Strength At Yield | 22 MPa |
| Elongation At Break | 500% |
| Flexural Modulus | 650 MPa |
| Izod Impact Strength 23 C | 5 kJ/m² |
| Vicat Softening Point | 105°C |
| Heat Deflection Temperature 0 45 Mpa | 75°C |
| Melting Point | 135°C |
| Haze | 1.0% |
| Gloss 60 | 120 |
As an accredited RANPELEN PP Terpolymer SFC-750D factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RANPELEN PP Terpolymer SFC-750D is supplied as virgin pellets in 25 kg polyethylene-lined paper bags, palletized and wrapped. |
| Container Loading (20′ FCL) | 20′ FCL loading of RANPELEN PP Terpolymer SFC-750D: 25 kg bags on pallets, about 20 metric tons per container. |
| Shipping | RANPELEN PP Terpolymer SFC-750D ships as a non-hazardous, free-flowing pellet. Pack in moisture-proof lined bags or hopper containers; keep dry and away from heat, sparks, and direct sunlight. Avoid stacking damage, protect from impact, and transport in clean, covered vehicles. Store in a cool, ventilated area until use. |
| Storage | Store RANPELEN PP Terpolymer SFC-750D in a cool, dry, well-ventilated area, away from direct sunlight and strong heat sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid storing near oxidizing agents. Use proper static-discharge precautions when handling. Under recommended conditions, shelf life is typically 12 months from manufacture date. |
| Shelf Life | Store in a cool, dry place; shelf life is two years from production date when kept in original, unopened packaging. |
RANPELEN SFC-750D is a propylene-ethylene-butene terpolymer formulated for low-temperature heat-seal layers in polypropylene-based flexible packaging. Typical melt flow rate data for this grade cluster around 5–8 g/10 min at 230 °C under 2.16 kg per ISO 1133-1:2022, and density falls near 0.90 g/cm³ per ISO 1183-1:2019. Differential scanning calorimetry of resin lots typically places the main melting endotherm between 126 °C and 135 °C, while hot-tack and seal-initiation measurements depend on coextrusion skin thickness, dwell pressure, and thermal history. These properties position the grade primarily in heat-sealable cast polypropylene, coextruded oriented skin, lamination coating, and barrier lidding formats. The following application scenarios are restricted to downstream processes where propylene terpolymer sealant function is technically established; published data for SFC-750D in non-film processes such as injection moulding are limited and are not included.
On three-layer cast film lines with total throughputs between 300 kg/h and 600 kg/h, SFC-750D is run as the sealant skin in A/B/A structures where the core is propylene homopolymer. The sealant layer is typically maintained at 100 wt%; converter-led modifications use 80 wt% SFC-750D with 20 wt% propylene-ethylene random copolymer to suppress blocking after corona treatment. Melt temperature at the die is held at 225–245 °C, chill-roll water inlet at 18–26 °C, and air gap at 10–15 mm; corona treatment of the sealant side to 38–42 mN/m is required only when water-based lamination adhesives are applied. Compliance is governed by FDA 21 CFR 177.1520(c), EU Regulation 10/2011 with overall migration not exceeding 10 mg/dm², and GB 9685-2016 for additives in food-contact applications. Terminal webs are slit into reels for lamination-based snack packaging, biscuit wrappers, and general food pouches; finished film thickness typically ranges from 20 µm to 60 µm, with sealant skin thickness between 3 µm and 8 µm.
Process records from cast-film converting indicate that winding tension above 8 N/mm² on 300 mm core shafts increases blocking when slip levels are below 800 ppm erucamide equivalent; anti-block masterbatch dosing at 1–3 wt% is therefore applied in the skin for reels stored above 30 °C. The maximum winding roll diameter is usually limited to 600 mm to control blocking. These are production constraints observed on chill-roll lines, not resin defects.
Sequential stenter coextrusion imposes a thermal conflict on a terpolymer seal skin: the skin must remain below its blocking threshold during machine-direction orientation while the core reaches sufficient orientation temperature. For SFC-750D skin layers, published production guidelines indicate MDO preheat rolls between 118 °C and 128 °C, with stretch ratios of 4.5–5.5:1 and slow-draw roll temperatures near 90–100 °C; transverse-direction oven temperatures are generally held at 155–165 °C. The seal skin is coextruded at 1.5–3.0 µm on a 15–30 µm oriented core, equivalent to 7–12 wt% of the final film. When MDO preheat is raised above 130 °C, low-melting terpolymer fractions migrate to the roll surface and produce transfer deposits within 10–20 minutes of continuous operation; this is the primary limitation reported on production-scale stenter lines. Compliance remains under FDA 21 CFR 177.1520(c), EU 10/2011, and EU 2023/2006 for good manufacturing practice in food-contact materials. Terminal products include printed lamination film for confectionery bundling, bakery overwrap, and high-speed horizontal form-fill-seal pouches. Seal-initiation temperature after orientation is typically evaluated according to ASTM F88/F88M-21 at a dwell of 0.5 s and pressure of 0.275 MPa.
| Formulation | Skin thickness | MDO preheat | Seal initiation at 0.5 s dwell | Observed issue |
|---|---|---|---|---|
| 100% SFC-750D | 2.0 µm | 121 °C | 108–114 °C | Roll deposit above 130 °C |
| 80% SFC-750D / 20% random copolymer | 2.0 µm | 123 °C | 112–118 °C | Higher seal initiation, lower blocking |
| 100% SFC-750D with 2 wt% anti-block | 2.5 µm | 118 °C | 110–116 °C | Reduced roll deposit |
Ranges in Table 1 are compiled from converter process logs; published comparative data for SFC-750D on sequential stenter lines is limited. Processing windows below 118 °C often reduce transverse-direction stretching uniformity, while preheat above 130 °C accelerates terpolymer transfer; no single MDO setting eliminates both risks across all line configurations.
Within extrusion lamination lines operating at 150–300 m/min, SFC-750D is used as the sealant coating layer on aluminium foil, PET, or BOPP substrates for flexible packaging. The resin is processed at melt temperatures of 280–310 °C through a coat-hanger die with die gap 0.5–0.8 mm; coating weight is controlled between 15 g/m² and 25 g/m². Addition of SFC-750D as the sealant layer is normally 100 wt%, but coextrusion coating lines can run a tie layer of maleic anhydride grafted polypropylene at 3–5 g/m² when foil adhesion is below target. Chill-roll temperature is set at 15–20 °C; corona pretreatment of the substrate to 38–44 mN/m and ozone dosing at 10–20 g/h are standard for adhesion. Compliance includes FDA 21 CFR 177.1520, EU 10/2011, and for laminates intended for retorting, EC 1935/2004 overall migration testing on the final article. Terminal finished products include retortable stand-up pouches, lamination films for dried food, and liquid packaging with sealant layer thermostable up to 121 °C for 30 min; the sealed pouch must be tested according to ASTM F88/F88M-21 after retort.
Adhesion failure at the foil/sealant interface is the most commonly recorded defect on such lines; when peel strength falls below 3 N/15 mm, converters first increase ozone concentration before adjusting melt temperature. Grade-specific published data for SFC-750D in retort lamination is limited; therefore retort seal-strength validation should be performed on the final laminate rather than on monolayer film.
Seal-strength data for lidding films made with SFC-750D follow the medical packaging requirement that the sterile barrier be peelable, continuous, and capable of surviving distribution. The resin is incorporated as a heat-seal layer of 20–30 µm within a 50–80 µm lidding web, coextruded with a polyethylene or cast PP core; the sealant layer composition is frequently 60–80 wt% SFC-750D with the balance propylene-ethylene random copolymer to reduce seal initiation. Sealing to rigid PETG or PS trays is performed on tray lidding machines at jaw temperatures of 140–160 °C, dwell 0.5–1.0 s, and pressure 0.3–0.6 MPa. Compliance is assessed under ISO 11607-1:2019 and ISO 11607-2:2019 validation protocols, with material chemical suitability per USP <661.1>, FDA 21 CFR 177.1520, and biological endpoints defined by ISO 10993-1:2018. Terminal products include lid stock for surgical instrument trays, syringe pouches, and wound care kits. Sterile barrier peel strength is typically specified between 1.0 N/15 mm and 5.0 N/15 mm depending on tray material and closure geometry.
| Requirement | Standard designation | Test data requirement |
|---|---|---|
| Olefin polymer food-contact status | FDA 21 CFR 177.1520(c) | Extraction in food simulants |
| EU plastics migration limit | EU 10/2011 | Overall migration 10 mg/dm² |
| Seal strength | ASTM F88/F88M-21 | Peel strength after sterilization |
| Sterile barrier validation | ISO 11607-1:2019 | Seal integrity, ageing |
| Medical plastic safety | USP <661.1> | Extractables, pH, turbidity |
A significant operational boundary appears when ethylene oxide or moist-heat sterilization follows sealing: low sealant crystallinity can shift peel force after exposure. Converters therefore age lidding samples for 72 h at 35 °C post-sterilization before release testing.
A coextruded metallized sealant web places two requirements in direct opposition: the metallized outer surface demands low oligomer and slip-additive bloom, while the reverse sealant surface demands low heat-seal initiation and resistance to blocking on the winder. For SFC-750D, the sealant skin is positioned on the side opposite the metallized homo-PP core; the sealant layer represents 8–15 wt% of total film, with SFC-750D used at 100 wt% or let down to 70 wt% with a high-purity propylene-ethylene copolymer. Slip addition is restricted to the core or omitted entirely, because erucamide bloom can reduce metal adhesion; if slip is necessary, non-migratory polymer-bound slip at 0.2–0.5 wt% is used. Vacuum metallization is conducted at chamber pressures below 2×10⁻⁴ mbar, aluminum coating thickness 30–60 nm, and web path temperatures not exceeding 40 °C to avoid sealant blocking. Compliance includes EU 10/2011, EC 1935/2004, and FDA 21 CFR 177.1520(c); metal adhesion is often evaluated using ASTM F904-16 or an internal tape-peel threshold of 3 N/15 mm. Terminal products are metallized moisture-barrier pouches, coffee block-bottom bags, and metallized flow-wrap for confectionery. Published data on SFC-750D specifically in metallized structures is limited, so pre-production trials are required to confirm aluminum bond levels after 72 h aging at 35 °C.
At packaging machine speeds above 80 bags/min, a sealant layer must achieve sufficient hot-tack within a dwell time often below 50 ms. SFC-750D is added at 15–30 wt% into propylene homopolymer or random copolymer in monolayer or three-layer blown/cast films used on vertical form-fill-seal lines; the addition ratio is chosen to lower seal initiation without sacrificing machinability. The film is extruded at 200–230 °C for cast and 180–210 °C for blown, with frost line height maintained at 3–5 die diameters; treated seal surfaces are kept at 38–40 mN/m. Seal jaw temperature is set at 130–150 °C, with cooling of the VFFS forming tube to below 45 °C to prevent pre-sealing. Compliance is under FDA 21 CFR 177.1520, EU 10/2011, and for frozen-food packaging, the relevant national food-contact regulations covering use at temperatures below -18 °C. Terminal product types include granular coffee and tea stick packs, frozen vegetable pouches, and single-serve snack bags. Seal strength is validated by ASTM F88/F88M-21; hot-tack strength is measured according to ASTM F1921/F1921M-18 at 0.2 s dwell.
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RANPELEN PP Terpolymer SFC-750D is a cast-film sealant resin based on a random terpolymer of propylene, ethylene, and butene-1. The grade is part of the RANPELEN polypropylene portfolio and is positioned for coextruded cast polypropylene webs in which the sealing layer must provide a seal initiation temperature below that of propylene-ethylene random copolymers and substantially below that of polypropylene homopolymers. The terpolymer architecture reduces crystallite size and melting point, shifting the heat-seal response to lower web-surface temperatures while retaining the optical clarity and extractable resistance characteristic of polypropylene-based sealing layers. The product is supplied as a low-viscosity pellet for high-line-speed cast film; the current manufacturer’s technical data sheet defines the production specification, lot-to-lot tolerance, and food-contact status. Published external test data for this specific grade is limited, and the numerical envelopes in this document are screening ranges for converter evaluation rather than a substitute for the current certificate of analysis.
For cast-film conversion, melt temperature at the die is typically held between 220 °C and 250 °C. The lower processing window is possible because the terpolymer melting peak falls below that of random copolymers, but the melt must remain above the sealant-layer flow instability limit. A single-screw extruder with a 30:1 or 32:1 L/D ratio and a barrier screw with a dispersion or distributive mixing section is preferred; 24:1 machines without adequate mixing may retain partially melted granules in fast transitions. Barrel profiles are normally ramped from 180 °C in the feed throat to 230 °C in the metering zone and 240 °C at the adapter. The die gap is set between 0.5 mm and 0.8 mm, and the air gap from die exit to chill-roll contact is kept as short as web-edge stability permits. Chill-roll temperature is maintained between 18 °C and 30 °C; higher temperatures reduce haze but can slow the solidification front and produce slack web handling, while lower temperatures can trigger moisture condensation on the roll face. Melt-cushion uniformity and edge bead removal are critical because the low melt strength of a high-comonomer terpolymer can generate width variation or draw resonance when line speed exceeds 80 m/min without optimised air-knife pressure.
In production-scale cast-film operations with propylene-ethylene-butene terpolymer sealants, a three-layer line with a 1,200 mm die and a 35:1 sealant-layer extruder often displays stable web formation at total output of 150 kg/h when the sealant melt temperature is maintained below 245 °C; published data specific to SFC-750D in this exact configuration is limited, but the behaviour is representative of the terpolymer class. Beyond this threshold, edge-weave and a low-molecular-weight oxidation residue accumulate on the chill roll after approximately 6 h of continuous operation and transfer to the film as repeating die lines. A 5 °C reduction in the compression-zone barrel temperature and an increase in chill-roll drive tension of 0.3 N/mm typically removes the defect without shifting the measured seal initiation temperature.
Prolonged exposure of a high-comonomer polypropylene melt to temperatures above 260 °C accelerates chain scission, oxidised gel formation, and loss of low-temperature seal response. In cast-film operations, the melt-temperature profile should be controlled so that the die exit temperature does not exceed 250 °C during steady state, and shutdown purges should use a lower-viscosity PP homopolymer rather than extended thermal soaking of the sealant resin. Residence time in the extruder and die should be limited to 5 min or less at processing temperature; longer residence times can increase yellowness index and reduce hot tack strength below the seal initiation specification when the additive package is not designed for long thermal hold. The use of a breaker plate with screen packs is permitted, but fine screens below 60 mesh can raise melt temperature locally and are unnecessary for a pre-stabilised pellet. Start-up scrap and off-spec edge trim generated from thermally degraded terpolymer should not be re-fed into the sealant layer at concentrations above 10 wt% because low-molecular-weight fractions migrate to the seal surface and alter the coefficient of friction after 48 h of annealing.
The selection of SFC-750D for a sealant layer is driven by three measurable responses: seal initiation temperature, hot tack peak temperature, and optical haze after 24 h conditioning at 23 °C and 50 % relative humidity. The table below provides a comparative screening envelope, not a production specification, for the grade against common polypropylene sealant chemistries.
| Property | Test method | SFC-750D screening envelope | Propylene-ethylene random copolymer | PP homopolymer cast film |
|---|---|---|---|---|
| Melt mass-flow rate, 230 °C/2.16 kg | ISO 1133-1:2022 / ASTM D1238 | 4.0–8.0 g/10 min | 5.0–9.0 g/10 min | 6.0–10.0 g/10 min |
| Density | ISO 1183-1:2019 | 0.895–0.905 g/cm³ | 0.900–0.910 g/cm³ | 0.900–0.910 g/cm³ |
| Melting peak | ISO 11357-3 | 125–135 °C | 130–140 °C | 160–165 °C |
| Seal initiation temperature, 0.5 N/15 mm, 1 s dwell | ASTM F2029 | 105–120 °C | 120–135 °C | 150–160 °C |
| Hot tack initiation temperature | ASTM F1921 | 110–125 °C | 125–140 °C | 155–165 °C |
| Haze, 50 µm cast film | ASTM D1003 | 1.0–3.0 % | 1.0–2.5 % | 1.5–3.5 % |
| Gloss, 45° | ASTM D2457 | 80–90 GU | 80–90 GU | 75–85 GU |
The screening envelope indicates that the principal advantage of the terpolymer is not a large optical gain relative to a random copolymer but a displacement of the seal and hot tack response toward lower web-surface temperatures. This permits a reduction in seal-bar setpoint of 5–15 °C on lines where the sealing layer is the limiting heat-transfer boundary. Because hot tack initiation remains close to the seal initiation curve, the grade is suited to high-speed vertical form-fill-seal packaging in which the seal must withstand product loading before cooling is complete. Haze and gloss are maintained within the range expected for cast polypropylene sealant films, but the final values depend on chill-roll surface roughness, additive package, and sealant-layer thickness.
Substitution of a random copolymer sealant layer with SFC-750D generally lowers the minimum seal-bar setpoint, but the conversion is not a drop-in replacement. The terpolymer has a broader melting interval and lower plateau modulus at the seal-bar interface, which means that the dwell time can be reduced by 0.1–0.2 s at the same seal temperature, but the pressure must be sufficient to collapse sealant-layer asperities. On high-speed horizontal form-fill-seal equipment, the lower heat of fusion reduces the cooling load per package and permits an increase of 10–20 % in cycling rate when the downstream transfer and discharge stages are not rate-limiting. The coefficient of friction after 7 d of ageing may be higher than a random copolymer if the slip-agent package is not adjusted, because the lower crystallinity alters migration kinetics of erucamide and silica-type antiblock. Seal strength at high temperature is improved in the 110–125 °C range, while the ultimate seal strength at 140 °C may be equivalent or slightly lower than a random copolymer because the terpolymer softens earlier.
In coextruded cast film structures, SFC-750D is generally assigned to the contact-seal layer and is not intended as a core or skin layer where melt strength and stiffness are primary requirements. The sealant layer thickness is commonly specified between 3 µm and 10 µm on webs from 20 µm to 80 µm total thickness. Below 3 µm, layer-to-layer thickness variation and die-lip roughness can produce local seal failure; above 10 µm, the terpolymer contributes unnecessarily to film cost and may reduce web modulus. Adhesion to propylene homopolymer core layers is achieved by melt interdiffusion and is generally adequate without tie resins when the feedblock temperature is kept between 230 °C and 250 °C. The use of a matte chill roll to control film appearance has a greater effect on haze than the resin itself, and the terpolymer replicates the roll surface after solidification because of its low crystallinity.
Commercial qualification of SFC-750D for food-contact packaging requires a supplier-issued declaration of conformity, not reliance on grade-name claims. The resin is a polyolefin within the scope of FDA 21 CFR 177.1520 for olefin polymers and EU Regulation (EC) No 1935/2004 for food-contact materials, but the specific migration limits depend on the final film structure, additive package, and end-use conditions. The matrix below lists the standard documentation positions that should be reviewed for a typical non-fatty, room-temperature food-contact application. Published data for this specific grade is limited; therefore, the absence of a listed standard in a supplier document should be resolved before first production shipment.
| Compliance area | Relevant reference | Typical converter verification step |
|---|---|---|
| US food-contact status | FDA 21 CFR 177.1520 | Letter of no objection or supplier declaration for the specific grade |
| EU framework for food-contact articles | EU Regulation (EC) No 1935/2004 | Declaration of compliance from packaging converter, supported by resin supplier statement |
| EU plastics measure | EU Regulation (EU) No 10/2011 | Overall migration and specific migration testing on final film |
| REACH SVHC status | EC 1907/2006 | Supplier confirmation of no SVHC above 0.1 % w/w |
| RoHS restricted substances | IEC 63000 / 2011/65/EU | Supplier declaration for lead, mercury, cadmium, hexavalent chromium, PBB, PBDE |
| Heavy metals in packaging | 94/62/EC | Sum of lead, cadmium, mercury, and chromium(VI) below 100 ppm |
The low crystallinity of SFC-750D accelerates migration of amide-based slip agents to the seal surface compared with homopolymer, so the additive package is normally formulated at the lower end of the slip-agent concentration range used for random copolymers. Corona treatment of the exposed skin layer, not the sealant layer, is standard in cast film; if the sealant layer is corona-treated for printability, the treatment level should be limited to 38–42 mN/m measured by ASTM D2578. Higher treatment levels can oxidise the sealant surface and raise the seal initiation temperature by up to 3 °C after 30 d of ageing. For untreated sealant layers, contact angle measurements against deionised water typically remain above 85° if no external contamination is introduced. Silicone release sprays, kraft paper dust, and polyethylene-handling gloves that have contacted terpolymer film rolls should be avoided because low-molecular-weight lubricants can transfer to the seal surface and reduce seal strength at high-speed filling.
