| HS Code | 946088 |
| Melt Flow Index 230 C 2 16 Kg | 7 g/10 min |
| Density | 0.90 g/cm³ |
| Tensile Strength At Yield | 30 MPa |
| Elongation At Break | 400% |
| Flexural Modulus | 950 MPa |
| Izod Impact Strength Notched 23 C | 55 J/m |
| Rockwell Hardness | R95 |
| Heat Deflection Temperature 0 45 Mpa | 105 °C |
| Vicat Softening Point | 140 °C |
| Haze | 3% |
As an accredited RANPELEN PP Terpolymer SFI-740P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RANPELEN PP Terpolymer SFI-740P is packaged in 25 kg woven bags with polyethylene lining, quantity per bag: 25 kg. |
| Container Loading (20′ FCL) | 20′ FCL loading: RANPELEN PP Terpolymer SFI-740P packed in 25 kg bags, palletized, with approximately 17–18 metric tons per container. |
| Shipping | RANPELEN PP Terpolymer SFI-740P ships as moisture-protected, sealed bags or drums to preserve quality. Store in a cool, dry, well-ventilated area away from heat, ignition sources, and direct sunlight. Ensure secure palletization and labeling. Use proper PPE during handling, and follow standard chemical transport regulations for safe delivery. |
| Storage | Store RANPELEN PP Terpolymer SFI-740P in a cool, dry, well-ventilated area. Keep the original sealed container protected from direct sunlight, moisture, and high temperatures. Avoid contact with oxidizers, ignition sources, and dust accumulation. Handle gently to prevent bag damage or contamination. Under proper conditions, shelf life is typically one year from receipt. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored in a cool, dry place away from direct sunlight. |
RANPELEN PP Terpolymer SFI-740P operates as the heat-sealable skin in three-layer and five-layer cast polypropylene structures for high-speed vertical and horizontal form-fill-seal packaging of dry foods, confectionery, and fresh produce. On an 1,800 mm cast film line with 65 mm/90 mm/65 mm extruder screw diameters at L/D 30:1, the sealant extruder barrel is operated with a reverse temperature profile of 185°C at the feed throat, 210°C in the compression zone, and 230°C in the metering zone to prevent pellet bridging in the cooled feed section. The terpolymer melt is delivered through a flat die with 0.8–1.5 mm die gap and a 230–240°C die temperature; the chill roll water inlet is held at 18–24°C with an air-knife positioned 5–10 mm from the die lip to suppress post-crystallization haze. The low sealing plateau associated with propylene-ethylene-butene random sequencing permits jaw temperatures of 112–125°C under a dwell time of 0.3–0.5 s, measured against ASTM F2029-16 for heatsealability. For a 30 µm total film with 8 µm sealant skins on each side, dwell at 120°C, 0.3 MPa, and 0.5 s yields seal strengths of 4.5–7.0 N/15 mm at 300 mm/min per ASTM F88/F88M-21; higher core gauge shifts the failure mode from interfacial peel to film tear.
Edge trim containing SFI-740P is reclaimed into the homopolymer core layer at 10–20 wt% without loss of optical clarity when the screen-pack differential pressure is maintained below 35 bar. At regrind fractions above 20 wt%, gel flecks may appear in the quenched film if a 200-mesh screen pack is not used or if the core extruder temperature exceeds 245°C. The outer sealant surface is corona-treated to 38–42 mN/m for downstream printing or lamination; the inner sealant side remains untreated to preserve seal initiation. In tropical storage at 35°C and 70% relative humidity, an unfilled grade without migratory slip additives can show an increase in coefficient of friction from 0.30 to 0.55, measured per ASTM D1894-14, and this change must be accommodated by derating form-fill-seal belt speeds.
Chill roll surface temperature uniformity is critical because the terpolymer crystallizes over a broad window below 105°C; a roll surface differential greater than 2°C across the web width produces asymmetric shrinkage in laminated structures. In-line thickness gauging on the sealant skin is set to reject web sections where sealant layer thickness falls below 6 µm, because below that threshold the seal interface consumes the full skin and exposes the homopolymer core, causing seal-strength discontinuity.
In sequential biaxial orientation, a cast sheet containing the SFI-740P sealant skin is quenched on a casting drum at 20–30°C, then passed through machine-direction orientation rolls heated to 110–130°C for stretching at 4.5:1 to 5.0:1, followed by transverse stretching in a tenter frame at 8:1 to 10:1. The sealant skin thickness in the final 20 µm BOPP film is controlled at 0.8–1.5 µm; to achieve this, the coextruded skin before orientation is set at 5–10 wt% of the total cast sheet thickness. Premature crystallization of the sealant skin caused by casting drum temperatures above 35°C generates transverse-direction microvoids during tenter stretching because the low-melting terpolymer phase does not deform uniformly with the isotactic homopolymer core. The resulting reduction in seal strength can reach 40% when evaluated at 125°C per ASTM F88/F88M-21.
Heat-seal initiation of the oriented sealant web is measured with flat-jaw crimp sealing per ASTM F2029-16 and lies between 115°C and 130°C. At 125°C, 0.3 MPa, and 0.5 s dwell, peel strength reaches 2.5–4.5 N/15 mm; above 0.4 s dwell the seal is stronger than the oriented core and failure converts to tear. Optical haze of a 20 µm film is typically below 2.0% when measured per ASTM D1003-21, and gloss at 45° exceeds 85 GU per ASTM D2457-21. These optical values apply only when the sealant skin contains no particulate antiblock above 1,000 ppm and when regrind is excluded from the skin layer.
In extrusion lamination of paper, aluminium foil, or vacuum-metallized BOPET, the terpolymer is processed at melt temperatures of 255–275°C through a flat die with 0.6–1.0 mm die gap and an air-gap of 150–220 mm. The elevated melt temperature compensates for the short air-gap residence time and reduces melt curtain neck-in; at line speeds above 200 m/min, 2–4 wt% of a high-melt-strength PP is added to stabilize the curtain edge and suppress draw resonance. Coating weight is controlled between 15 g/m² and 25 g/m² by the chill-roll speed ratio. Peel adhesion to aluminium foil is measured at 100 mm/min per ASTM F904-16; values of 50–80 N/15 mm are achieved on ozone-treated or primed foil, while untreated foil shows cohesive failure within the terpolymer layer at lower values.
Blocking at the winder occurs if the web temperature exceeds 45°C because the low melting onset allows film-to-film adhesion at the reel core. Chill-roll residence time after the nip must be at least 0.3 s before winding. Food-contact laminates are assessed under FDA 21 CFR 177.1520 and EU Regulation (EU) No 10/2011; migration testing with EN 1186-1 simulants is required when the coated structure is intended for fatty food contact.
For form-fill-seal sterile barrier systems specified under ISO 11607-1:2019 and EN 868-5, the terpolymer is coextruded as an 8–15 µm sealant layer with a PET, PA, or coated paper structural web and sealed against uncoated polypropylene trays or medical-grade coated paper. Seal initiation below 125°C is critical because prolonged dwell above this threshold can distort thermoformed tray flanges made from amorphous PET or polystyrene. On a rotary sealing head operating at 118–125°C, 0.35 MPa, and 0.5 s dwell, the sealant develops peel strengths of 1.2–2.5 N/15 mm tested at 200 mm/min per ASTM F88/F88M-21; this range permits manual peel-open delamination without fibre tear. Channel-free seals are verified by dye-penetration testing per ASTM F1929-15 and restrained burst testing per ASTM F2054/F2054M-13.
After ethylene-oxide sterilization, residual EO levels below 25 ppm are achieved after 48 h aeration at 35°C when the laminate is not sealed against a barrier surface that limits desorption. Steam sterilization above 121°C is not recommended because seal creep under autoclave pressure can produce channel defects; gamma irradiation at 25–50 kGy may reduce seal strength by 10–15% and should be validated under ISO 11137-1. The sealant side must not be corona-treated above 40 mN/m, since oxidative modification can inhibit interfacial diffusion and reduce seal strength by more than 30%. Extractables testing is performed per ISO 10993-12:2021 and cytotoxicity per ISO 10993-5 when the structure is used for direct liquid contact.
The table consolidates representative production-scale conversion boundaries for SFI-740P across three primary continuous film-forming platforms. These ranges are derived from converter process data and equipment manufacturer specifications; start-up parameters must be adjusted for line geometry and adjacent layers.
| Conversion platform | Sealant layer thickness | Melt temperature | Critical downstream parameter | Seal initiation window |
|---|---|---|---|---|
| Cast film coextrusion | 7–12 µm | 220–235°C | Chill roll 18–24°C | 112–125°C |
| Sequential BOPP | 0.8–1.5 µm oriented | 230–245°C at die | Casting drum 20–30°C | 115–130°C |
| Extrusion coating | 15–25 g/m² | 255–275°C | Air gap 150–220 mm | 115–130°C |
Air-cooled blown film conversion of SFI-740P is limited to coextruded skins of 5–10 µm over LDPE or LLDPE cores with blow-up ratio held below 2.5:1 and frost-line height not less than 250 mm. Monolayer configurations lose bubble stability at melt temperatures above 210°C because the low-melt elasticity of random terpolymers cannot maintain a uniform frost line. Published data for specific monolayer SFI-740P blown film formulations is limited.
In-mold label films with an SFI-740P sealant side are coextruded with a printable white PP core at total label thickness 45–60 µm and sealant layer thickness 5–10 µm. During injection molding, the label is inserted into the mold cavity at 35–60°C and the molten polypropylene container wall at 220–240°C supplies the heat required for activation of the terpolymer layer. Air entrapment between the label and container wall is reduced by the low melting onset of the random terpolymer. Label adhesion is evaluated by a 90° peel test per ASTM D6862-11; peel values above 0.8 N/15 mm typically indicate cohesive failure in the label core rather than adhesive failure at the container interface.
Because the sealant side is deliberately non-corona-treated in this application, printing must be confined to the opposite core surface; corona treatment of the sealant side before insertion can reduce interdiffusion with the container melt and lead to label lifting at the container rim.
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RANPELEN PP Terpolymer SFI-740P is a pelletized propylene-ethylene-butene-1 random terpolymer supplied for sealant-layer coextrusion in cast polypropylene (CPP), blown film, and oriented film structures. The grade designation SFI-740P places the material in a low seal initiation temperature class, typically selected when a fusion seal must form below 120 °C at production sealing speeds. The product is distinguished from propylene-ethylene random copolymers by the insertion of 1-butene comonomer along the propylene backbone, which disrupts crystallisable isotactic sequences and depresses the crystalline melting peak into the 125 °C to 135 °C range. Published product-specific data for this exact grade remain limited beyond the supplier certificate of analysis; the following discussion therefore separates test methodology from class-typical ranges for equivalent propylene-ethylene-butene-1 terpolymer chemistry. The resin should not be confused with homopolymer PP or standard random copolymer grades that lack the second comonomer and consequently exhibit higher seal initiation temperatures and narrower high-speed sealing windows.
In coextruded packaging structures, the sealant layer is the primary determinant of package hermeticity at the jaw-impulse seal. SFI-740P is therefore evaluated by seal initiation temperature, hot tack force, seal strength after cooling, and optical haze rather than by tensile modulus alone. Typical converters also measure the coefficient of friction at the film surface because downstream form-fill-seal performance can shift by more than 0.1 COF units when chill-roll temperature drifts outside the 18 °C to 28 °C range. The film property set is strongly process-dependent; a single melt flow rate value or DSC melting peak cannot predict sealing behaviour unless the quench rate, die gap, and draw ratio are controlled.
A propylene-ethylene-butene-1 terpolymer differs from a propylene-ethylene random copolymer primarily in the distribution of crystallisable sequences. Ethylene alone introduces isolated interruptions along the propylene chain, but the additional presence of 1-butene creates longer steric defects that require less thermal energy to separate adjacent crystalline lamellae during the sealing operation. The practical outcome is a reduction in seal initiation temperature of approximately 10 °C to 18 °C relative to a propylene-ethylene random copolymer of equivalent melt flow rate. This shift allows the SFI-740P class to be sealed at jaw temperatures between 108 °C and 120 °C, whereas conventional random copolymers typically require 125 °C to 135 °C to achieve a comparable fusion interface. The lower initiation temperature is accompanied by a broader seal plateau because the melting transition is spread over a wider temperature interval. In comparison with metallocene polyethylene sealants, the SFI-740P class retains the higher flexural modulus of polypropylene, with class-typical values of 700 MPa to 900 MPa according to ISO 178; it is selected over standard random copolymer when seal initiation below 120 °C is required without changing the outer web material.
For heat-seal applications, the practical consequence of the comonomer modification is a shift in the entire sealing curve, not merely a lower initiation point. Production sealers must therefore qualify both the force required to pull open the seal and the force the molten film can sustain before the jaw releases. Table 1 compares class-typical property windows that control these behaviours. The ranges in Table 1 are not a substitute for the SFI-740P certificate of analysis; lot-specific values for melt flow rate, additive content, and seal initiation temperature are controlled by the manufacturer and may vary within the indicated class. Users should request a batch certificate against ISO 1133-1:2022, ISO 1183-1:2019, and ASTM F88 before qualifying a packaging structure.
| Property | Test method | SFI-740P-type terpolymer | Propylene-ethylene random copolymer |
| Melt flow rate at 230 °C/2.16 kg | ISO 1133-1 | 5.0–7.5 g/10 min | 5.0–9.0 g/10 min |
| Density | ISO 1183-1 | 0.895–0.905 g/cm³ | 0.895–0.910 g/cm³ |
| DSC melting peak | ISO 11357-3 | 125–135 °C | 138–148 °C |
| Vicat softening point, A50 | ISO 306 | 105–118 °C | 120–132 °C |
| Seal initiation temperature | ASTM F1921 / ASTM F88 | 108–118 °C | 125–135 °C |
| Tensile yield stress | ISO 527-2 | 18–24 MPa | 22–28 MPa |
| Tensile elongation at break | ISO 527-2 | > 500% | > 500% |
| Haze on 50 μm cast film | ASTM D1003 | 1.0–2.5% | 1.0–2.0% |
Optical characterisation forms part of the specification for SFI-740P-type sealant films. Haze on a 50 μm cast film is typically below 2.5% when measured according to ASTM D1003, and gloss at 60° is typically above 85 GU when measured according to ASTM D2457. These values are achieved only when the melt is quenched rapidly and the die lip is free of degraded resin deposits. In coextruded structures, the sealant skin may be evaluated after lamination, but haze can increase by 0.5 to 1.5 percentage points depending on adhesive thickness, lamination temperature, and core-layer crystal morphology.
Melt flow rate for SFI-740P-type terpolymers is normally specified in the 5.0 g/10 min to 7.5 g/10 min range at 230 °C under a 2.16 kg load according to ISO 1133-1. The molecular weight distribution is typically broad enough to maintain web stability at draw ratios up to 8:1 without excessive neck-in, while remaining low enough to seal at high speed. Processing evaluations frequently include a shear viscosity curve over 10 s−1 to 1,000 s−1 at 230 °C; the resin is selected to remain below 250 Pa·s at the die lip shear rate to prevent melt fracture on thin film dies.
On a 90 mm single-screw extruder with a 30:1 L/D barrier screw, the SFI-740P class is typically starve-fed into a reverse-temperature profile. Barrel zones from feed to metering are set between 180 °C and 230 °C, with the adapter and die held at 220 °C to 240 °C to avoid melt fracture while limiting thermal degradation. A screen pack of 60/100/60 mesh is normally installed ahead of the melt pump to increase residence-time distribution control; melt temperature at the die lip is maintained below 250 °C. The extrudate is cast onto a polished chill roll held at 20 °C to 26 °C, and the air gap is kept between 5 mm and 20 mm to balance haze and draw resonance. Because the random terpolymer has lower crystallinity than homopolymer PP, edge pinning force and die-bolt adjustment must be reduced relative to a homopolymer line: an all-polypropylene homopolymer edge pattern can overload the thinner sealant melt and produce web tears during line-speed transitions above 120 m/min.
Thickness uniformity of the sealant layer is measured on-line with a beta gauge or off-line by optical profilometry. A cross-web variation of more than ±2 μm can create local seal initiation differences of 3 °C to 5 °C because thicker regions require more heat to reach the fusion interface. This sensitivity is higher than homopolymer PP and is a direct consequence of the low crystalline melting range.
Nitrogen purging of the feed throat and hopper is recommended when ambient relative humidity exceeds 60% RH to prevent moisture-induced surface streaks, although polypropylene is not hygroscopic. The additive package in SFI-740P is typically formulated for low coefficient of friction and stable film-to-metal slip; migration of amide-based slip agents to the surface proceeds over the first 24 h to 72 h after film winding. The material should be processed with closed-loop pellet feed and a minimum residence time below 10 min at melt temperatures above 240 °C, as prolonged exposure causes chain scission and shifts the seal initiation temperature upward by more than 3 °C in some production lots. No pre-drying is required below 60% RH.
For laminated food packaging, SFI-740P is coextruded as a 5 μm to 10 μm sealant skin over a propylene homopolymer or block copolymer core. The skin-to-core thickness ratio is commonly maintained between 1:5 and 1:10 to preserve the low-temperature seal while the core contributes flexural stiffness and thermal resistance. In such structures, seal strength after lamination is evaluated on a laboratory heat sealer with a 5 mm wide jaw, 0.3 MPa sealing pressure, and 1.0 s dwell, according to ASTM F88. A measurable seal of 2.0 N/15 mm is typically reached at a jaw temperature of 112 °C, whereas a propylene-ethylene random copolymer skin of equal thickness reaches the same force only above 128 °C. This temperature gap is the primary reason converters select a terpolymer sealant when packaging heat-sensitive contents or when sealing speeds exceed 40 cycles/min on a vertical form-fill-seal line.
The material is used in unlaminated CPP film for textile packaging, stationery overwrap, and medical device pouches where a clean seal through dust or process lubricants is required. For medical packaging, the resin must meet the requirements of ISO 11607-1:2019 for packaging for terminally sterilised medical devices, and the converter must validate seal integrity after ethylene oxide or gamma sterilisation. Ethylene oxide sterilisation at 55 °C does not typically distort the seal, but gamma sterilisation may embrittle the skin because chain scission competes with crosslinking. The converter should therefore measure seal strength before and after sterilisation, not merely on unstressed film. A retention of at least 80% of initial seal strength after 25 kGy gamma is a commonly used internal acceptance criterion, although published data for SFI-740P in this exact configuration are limited.
The addition of 1-butene lowers seal initiation but simultaneously reduces the high-temperature cohesive force during the molten phase of the seal. On hot-tack testers operating according to ASTM F1921 at a seal pressure of 0.3 MPa and dwell of 0.5 s, a SFI-740P-type terpolymer often exhibits a peak hot tack force of 3.0 N/15 mm to 4.5 N/15 mm between 105 °C and 120 °C, but the curve falls more steeply above 125 °C than that of a random copolymer. In high-speed packaging lines with jaw temperatures above 130 °C, the seal can fail under burst pressure when the molten film is unable to sustain the opening force of the product, even if the final cooled seal strength is acceptable. The processing window for optimal hot tack is therefore narrower than the final seal strength window: shifts of ±5 °C in jaw temperature around 115 °C can reduce hot tack force by more than 20%.
To manage this conflict, converters controlling vertical form-fill-seal lines should profile the jaw temperature across the seal bar and maintain the back-up jaw setpoint no higher than 120 °C when SFI-740P is used as the sealant layer. Uneven jaw temperatures across a 450 mm seal bar can produce local regions of molten-film thinning at the seal edge, a failure mode observed on intermittent-motion machines running above 60 bags/min. The chill-roll temperature on the cast line must also remain within a ±3 °C band around the setpoint; excursions beyond that band increase crystalline size at the film surface and shift the seal initiation temperature upward by up to 4 °C after winding. These interactions are the reason that processing trials should map seal strength against jaw temperature and hot tack force rather than relying on a single reported seal initiation value.
Regulatory status for food contact requires that the final film or article satisfy EU Regulation (EC) No 10/2011 as amended, including overall migration limits in Annex II and specific migration limits for any additives used. In the United States, the olefin polymer base resin may be evaluated under 21 CFR 177.1520(c) for polypropylene, provided that the finished article meets extractive specifications and any additional food-type limitations. SFI-740P is not a drop-in replacement for all sealant resins; it should not be combined with high levels of certain nucleating agents or acid-scavenging systems that alter crystallisation kinetics and erase the low-temperature seal advantage. The resin should also be kept below 260 °C melt temperature to avoid generation of oxidative degradation products that can affect organoleptic performance in sensitive food packaging.
Migration testing for polyolefin food contact materials is performed under the conditions of the EN 1186 series or EU Regulation (EC) No 10/2011 Annex V. Overall migration for neat PP sealant layers is commonly below 10 mg/dm² in simulant D2; the exact value depends on additive package, thickness, and contact time. No single resin value is universally valid. The converter must test the finished laminate because adhesives, printing inks, and coatings contribute to the migration result.
Under REACH Regulation (EC) No 1907/2006, the supplier is required to communicate applicable substance registrations and any substances of very high concern in the safety data sheet. RoHS compliance for electrical and electronic equipment packaging is assessed under Directive 2011/65/EU, but this obligation applies primarily to the packaged article rather than to the polyolefin resin itself. Batch-to-batch variation in seal initiation temperature is normally controlled within ±1.5 °C when the supplier maintains the same comonomer ratio and catalyst system. Blending of post-consumer recycled PP into the sealant layer is not recommended because it raises seal initiation temperature, increases gel count, and can introduce odour. Processors should obtain the supplier documentation for the exact SFI-740P lot because additive formulations can affect the final compliance declaration.
Production-scale cast lines running terpolymer sealant skins have recorded edge-tear failures when the air knife is positioned too far from the die exit, allowing neck-in of the low-crystallinity melt and an uneven edge bead. On a 1,200 mm wide line with a die gap of 0.6 mm, edge neck-in can exceed 15% if the air knife flow is insufficient, producing a thick edge that winds into hard bands. The defect appears as a localised increase in surface haze and is accompanied by a decrease in seal initiation reproducibility across the web. The corrective action is to reduce the air gap to 10 mm or less and to increase the pinning air pressure until the edge bead thickness is within ±2 μm of the film centre thickness.
A second observed failure occurs when the slip additive package has not fully bloomed before slitting. In such cases, the coefficient of friction rises above 0.5 during high-speed pouch forming, generating enough film-to-metal drag to interrupt the web. The issue is more common below 20 °C factory temperatures, where migration of slip additives is slower, and is addressed by conditioning slit rolls at 35 °C to 45 °C for 24 h to 48 h. These operational limits are not unique to SFI-740P, but the low seal initiation chemistry combined with an aggressive chill-roll quench can produce batch-to-batch shifts in slip bloom that require tighter ageing control than homopolymer PP films.
