| HS Code | 134803 |
| Melt Flow Rate | 7.0 g/10 min (230°C, 2.16 kg) |
| Density | 0.91 g/cm³ |
| Tensile Strength At Yield | 28 MPa |
| Elongation At Break | 350% |
| Flexural Modulus | 950 MPa |
| Izod Impact Strength Notched 23 C | 55 J/m |
| Heat Deflection Temperature | 95 °C at 0.45 MPa |
| Vicat Softening Temperature | 135 °C |
| Melting Point | 145 °C |
| Rockwell Hardness | R-90 |
| Haze | 10% |
| Gloss | 120% |
As an accredited RANPELEN PP Terpolymer SEP-750 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | RANPELEN PP Terpolymer SEP-750 is supplied as virgin pellets in 25 kg sealed multi-layer paper bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | RANPELEN PP Terpolymer SEP-750 is packed in 25 kg bags, loaded into a 20′ FCL at approximately 20 metric tons. |
| Shipping | Ship as non-hazardous plastic pellets in 25 kg bags or jumbo sacks, palletized and wrapped. Keep dry, away from moisture and direct heat. Use clean, covered containers or trucks. No special hazardous goods classification applies. Ensure stable loading and avoid puncture or contamination during transit. |
| Storage | Store RANPELEN PP Terpolymer SEP-750 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture contamination. Avoid prolonged storage at temperatures above 40°C. Store away from oxidizing agents and strong acids. Follow the Safety Data Sheet for specific handling requirements. |
| Shelf Life | Shelf life is approximately 12 months from manufacture date when stored in original packaging under dry, cool conditions. |
RANPELEN PP Terpolymer SEP-750 is applied in coextruded sealant webs, extrusion coating, and barrier packaging segments where low seal initiation and short-dwell hot-tack are controlling variables. The nominal melt-flow rate is 7.5 g/10 min at 230 °C/2.16 kg per ISO 1133-1:2022, placing the grade within the low-melt-temperature sealant class. Application-specific conversion parameters are not interchangeable; each downstream route imposes separate thermal, rheological, and compliance constraints.
Cast polypropylene lines running 50–80 µm lidding web and flow-wrap film use SEP-750 as the sealant skin in a three-layer ABA construction. The skin-layer formulation ratio is 70–100 wt% SEP-750; the balance is a propylene-ethylene random copolymer with MFR 1.5–3.0 g/10 min (ISO 1133-1:2022) when the converter requires a narrower seal plateau. Erucamide slip masterbatch is dosed at 0.2–0.6 wt%, and synthetic silica antiblock at 0.3–0.8 wt%. Antiblock loadings above 1.0 wt% increase haze and reduce heat-seal strength; haze on 50 µm film per ASTM D1003-21 moves from 2.5–3.5% to 6–9% when antiblock is raised from 0.4 wt% to 1.2 wt%. Batch-to-batch MFR variation of ±0.5 g/10 min typically shifts seal initiation by 2–3 °C. Food-contact compliance is assessed under FDA 21 CFR 177.1520 and EU Regulation 10/2011/EU Annex I, with overall migration below 10 mg/dm². Processing on a three-layer cast coextrusion line uses a barrier screw with L/D 30:1 to 33:1, die gap 0.6–1.0 mm, melt temperature 220–240 °C at the adapter, and chill roll temperature 18–24 °C. The main process conflict is low seal initiation versus blocking: chill roll temperatures above 25 °C or line speeds above 250 m/min increase skin-layer tacking at the contact roll, while line speeds below 120 m/min raise residence time at the die and produce polymer build-up on the lip. Terminal products include tamper-evident lidding for chilled dairy, fresh-produce modified-atmosphere flow-wrap, and bakery slug wraps.
In rotary vertical form-fill-seal operations, SEP-750 is specified for sealant layers where jaw dwell falls below 0.5 s. The sealant layer formulation is 90–100 wt% SEP-750; 5–10 wt% of a propylene homopolymer with MFR 2–4 g/10 min (ISO 1133-1:2022) is added when the web must resist heated jaw contact without elongation. Hot-tack is measured according to ASTM F1921/F1921M-18, with a converter-specific lower control limit of 0.5 N/15 mm over the seal temperature range 115–145 °C. Sealing conditions on production lines include jaw pressure 0.4–0.6 MPa, dwell 0.3–0.5 s, and serrated jaw temperature 125–150 °C. The limiting variable is interfacial heat transfer: when dwell is below 0.3 s, the interface does not reach the softening point, and hot tack drops below the control limit; raising jaw temperature above 150 °C to compensate causes skin-layer shrinkback and transfer to the sealing jaw. Compliance is evaluated under FDA 21 CFR 177.1520 and EU 10/2011/EU, with food simulant selection following the intended food type. Terminal packages include snack-sized pillow packs, granular food pouches, and frozen vegetable packets.
For aluminium foil and paper portion-pack lidding, extrusion coating uses SEP-750 at 100 wt% in the extruded layer; where neck-in exceeds 35 mm per side on a 300 mm deckle, converters replace 10–20 wt% with LDPE of melt index 7–8 g/10 min (ISO 1133-1:2022, 190 °C/2.16 kg) or a PP homopolymer of MFR 6–8 g/10 min. Lot-to-lot MFR drift of ±0.5 g/10 min changes neck-in by approximately ±3 mm and requires die deckle adjustment. The coating process runs on a single-screw extruder with L/D 28:1 to 32:1, barrel profile 180–320 °C, adapter and die at 290–320 °C, die gap 0.8–1.2 mm, air gap 180–250 mm, and chill roll temperature 15–20 °C. Coating weight is 12–25 g/m²; line speed is 100–250 m/min. Adhesion to aluminium foil requires either a solventless polyurethane primer at 0.2–0.5 g/m² dry coat or in-line ozone at 20–40 mg/m³; without surface activation, peel strength per ASTM F904-16 remains below 1.0 N/15 mm. Regulatory documents for food contact include FDA 21 CFR 177.1520, EU 10/2011/EU, and FDA 21 CFR 175.300 for the coated article. Terminal products are condiment sachets, butter portion lids, and aluminium foil lidding for yogurt cups.
Producers of 45–70 µm frozen food pouch film run a three-layer blown film die with skin layers containing 70–90 wt% SEP-750 and 10–30 wt% linear low-density polyethylene of melt index 1.0–2.0 g/10 min (ISO 1133-1:2022, 190 °C/2.16 kg); the LLDPE fraction maintains bubble stability at blow-up ratio 2.0–2.5, lay-flat width 500–900 mm, frost line height 2–4 die diameters, melt temperature 205–225 °C, and die gap 1.2–1.8 mm; pre-drying at 80 °C for 3 h is used only when pellets show surface condensation or wet regrind is introduced. Film is corona-treated to 38–42 mN/m and slit into pouches under FDA 21 CFR 177.1520 and EU 10/2011/EU for frozen vegetables, seafood, and ready-to-cook meal kits.
On sequential tenter-frame BOPP lines producing 18–30 µm coextruded twist-wrap and snack packaging film, the heat-sealable skin is formed from SEP-750 at 90–100 wt%, with 5–10 wt% of a high-crystallinity PP homopolymer skin-layer masterbatch to prevent blocking during annealing; the skin layer is 0.8–1.5 µm per side. The process is constrained by the heat-set temperature: the core homopolymer is stretched in machine direction at 125–135 °C and transverse direction at 155–165 °C, then heat-set at 165–170 °C. If the terpolymer skin exceeds 1.5 µm, blocking at the tenter clips occurs during heat setting; if it falls below 0.8 µm, seal initiation becomes inconsistent because the skin is thinned beyond a continuous layer. Haze is measured per ASTM D1003-21 on 20 µm film; 0.2–0.4 wt% erucamide slip and 0.1–0.3 wt% polymethyl methacrylate or silica antiblock maintain COF below 0.40 per ISO 8295:1995. Food-contact compliance is under FDA 21 CFR 177.1520 and EU 10/2011/EU. Terminal products are snack bags, confectionery twist-wrap, and bakery overwrap.
Steam-sterilised medical pouches are built as a coextruded structure in which the inner sealant layer contains 60–80 wt% SEP-750 and 20–40 wt% PP homopolymer with MFR 1.0–2.0 g/10 min (ISO 1133-1:2022, 230 °C/2.16 kg) to raise heat-distortion resistance, while the outer layer is PP homopolymer or nonwoven polyolefin. Sealing is performed at 130–145 °C, 0.4–0.6 MPa, and dwell 0.5–1.0 s; the sealed pouch is then steam-sterilised at 121 °C for 30 min at 0.10–0.12 MPa overpressure. The use of SEP-750 is limited to the sealant layer; if the terpolymer is present as a bulk film across the entire pouch wall, dimensional stability during autoclaving is unacceptable. Barrier requirements are verified under ISO 11607-1:2019, and packaging materials are evaluated under EN 868-5:2018. Published seal-strength data for SEP-750 on specific medical pouch geometries is limited; validation is therefore lot-specific. Terminal products include sterile barrier pouches for surgical instruments, autoclave-ready pouches, and sterile kit overwrap.
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RANPELEN PP Terpolymer SEP-750 is classified as a propylene–ethylene–1-butene random terpolymer supplied in pellet form for coextruded cast film, extrusion coating, and sealant layers. The model designation SEP-750 is a manufacturer-specific identifier and is not an ISO or ASTM nomenclature code. The grade belongs to the polypropylene terpolymer class that sacrifices modulus and upper service temperature to obtain lower seal initiation and improved optical clarity relative to polypropylene homopolymers and ethylene–propylene random copolymers. All numerical limits cited below are class-typical ranges for polypropylene terpolymer sealant resins, unless the lot-specific certificate of analysis or technical data sheet is identified as the controlling source.
Before production use, incoming resin should be conditioned according to ISO 291:2008, and the relevant properties should be measured under ISO 1133-1:2022, ISO 1183-1:2019, ISO 527-2:2012, ASTM D3418-15, ASTM D1003-13, ASTM F2029-16, ASTM F88/F88M-21, and ASTM F1921-18. Published data for this specific configuration is limited, particularly for seal initiation and hot-tack at line speeds above 150 m/min; converter trials with the intended film structure are required.
The low seal initiation of SEP-750 follows from the random insertion of ethylene and 1-butene into the propylene backbone. The butene comonomer disrupts isotactic sequence length more effectively than ethylene alone at equivalent total comonomer mass fraction, which reduces lamellar thickness and depresses the differential scanning calorimetry melting endotherm. Under ASTM D3418-15 at a heating rate of 10 K/min, the class-typical peak melting temperature for PP terpolymer sealant grades is 125–140 °C. The practical seal initiation, measured under ASTM F2029-16 with a 0.5 N/15 mm peel criterion, typically falls between 105 °C and 115 °C for a 30 µm cast film, depending on jaw pressure, dwell time, and chill-roll cooling history. The same test on a conventional ethylene–propylene random copolymer usually places the threshold between 120 °C and 130 °C. A polypropylene homopolymer does not form a usable heat seal until temperatures near 140 °C or higher.
Hot-tack force follows a similar ranking. Under ASTM F1921-18, using a J&B-type hot-tack tester with a seal pressure of 0.3 MPa, a seal time of 0.5 s, and a cooling time of 0.1 s, terpolymer sealant layers commonly show a hot-tack maximum between 1.0 N/15 mm and 2.5 N/15 mm. This narrow window is sensitive to extrusion temperature; at melt temperatures above 275 °C, thermo-oxidative chain scission reduces molecular weight, broadens the molecular weight distribution, and can lower hot-tack force by forming low-molecular-weight fractions that bloom to the surface.
The trade-off is mechanical. Flexural modulus under ISO 178:2019 at 2 mm/min for PP terpolymer sealant grades is class-typically 650–900 MPa, whereas ethylene–propylene random copolymers occupy 800–1,100 MPa and homopolymers exceed 1,200 MPa. A similar reduction is seen in tensile yield stress, which class-typically ranges from 20 MPa to 28 MPa under ISO 527-2:2012 type 1A specimens at 50 mm/min. The selection of SEP-750 therefore involves accepting lower stiffness in the sealant skin to obtain a lower seal-bar setpoint and shorter dwell time on high-speed packaging lines.
On coextrusion lines producing three-layer A/B/A cast film, SEP-750 is typically placed in the skin layers at 5–15 µm per side, while the core layer remains a polypropylene homopolymer or random copolymer. This structure localises the low sealing threshold at the film surface without sacrificing the flexural stiffness of the total film. The extrusion group should be configured with a 24:1 to 32:1 L/D barrier screw for the skin extruder; a Maddock or spiral-pine mixing section is acceptable only if the melt temperature measured at the die remains below 260 °C. At die temperatures above 260 °C, oxidation by-products can accumulate on the die lip and transfer to the cast film as gel specks, particularly after 6–8 h of continuous running.
Chill-roll temperature for SEP-750 skin layers should be maintained between 15 °C and 30 °C. A polished matte or mirror-finish roll is required to obtain haze below 2.5% under ASTM D1003-13 on 50 µm film. Higher chill-roll temperatures suppress fast cooling and allow secondary crystallisation, which can raise seal initiation by 3–5 K compared with rapid quenching. The air gap in extrusion coating should be reduced to 150–250 mm; larger gaps increase neck-in and edge-bead variability because terpolymer melt strength is lower than that of homopolymer polypropylene. For coating weights below 25 g/m², die gap settings from 0.5 mm to 0.8 mm are common, with draw ratio adjusted to avoid draw resonance. Published data for this specific configuration is limited, so line-specific optimisation is unavoidable.
| Property | Test method | Class-typical range | SEP-750-specific note |
|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022, 230 °C, 2.16 kg | 5.0–8.0 g/10 min | Confirm against certificate of analysis |
| Density | ISO 1183-1:2019, method A | 0.895–0.905 g/cm³ | No independent value available |
| DSC melting peak | ASTM D3418-15, 10 K/min | 125–140 °C | Lot-dependent |
| Tensile yield stress | ISO 527-2:2012, type 1A, 50 mm/min | 20–28 MPa | Published data for this specific configuration is limited |
| Flexural modulus | ISO 178:2019, 2 mm/min | 650–900 MPa | Lower than random copolymer |
| Haze, 50 µm cast film | ASTM D1003-13 | 1.0–3.5% | Depends on chill-roll polish and additives |
| Seal initiation temperature | ASTM F2029-16, 0.5 N/15 mm | 105–115 °C | Jaw pressure and dwell time must be fixed |
The values in Table 1 are class-typical ranges for unfilled PP terpolymer sealant resins and are not lot-specific guarantees. The controlling document for SEP-750 is the manufacturer’s technical data sheet. Where a converter certifies a finished package, the certificate must address the specific additive package, because slip agents, antiblocks, and nucleators can shift optical and sealing values beyond the ranges shown.
| Property | PP homopolymer | Ethylene–propylene random copolymer | PP terpolymer class including SEP-750 |
|---|---|---|---|
| DSC melting peak | 160–165 °C | 135–148 °C | 125–140 °C |
| Seal initiation | Above 140 °C; not preferred | 120–130 °C | 105–115 °C |
| Flexural modulus | Above 1,200 MPa | 800–1,100 MPa | 650–900 MPa |
| Haze in cast film | 2.0–4.0% | 1.5–3.0% | 1.0–2.5% |
| Typical sealant layer temperature window | 145–155 °C | 125–135 °C | 110–125 °C |
Compared with a standard ethylene–propylene random copolymer, SEP-750 can be expected to seal at a lower jaw setpoint. The additional 1-butene incorporation reduces the average isotactic block length and broadens the low-temperature side of the melting endotherm. This enables heat-seal layers to be activated at shorter dwell times on high-speed horizontal form-fill-seal machines; however, the same structural feature lowers stiffness and temperature resistance. Within the RANPELEN polypropylene portfolio, SEP-750 is differentiated from homopolymer and random copolymer grades by its lower seal initiation and lower flexural modulus. Direct comparison between SEP-750 and higher-modulus RANPELEN grades should be made using the same film thickness and seal protocol, because seal initiation is not a resin-only property; it is a system response that includes film gauge, seal bar temperature uniformity, and substrate heat capacity.
Because SEP-750 is a polypropylene-based terpolymer, its density remains near 0.900 g/cm³ under ISO 1183-1:2019 method A, which is lower than many PET and PLA sealants but higher than low-density polyethylene sealants. It is not a replacement for LLDPE in applications requiring seal initiation below 100 °C or high hot-tack on very fast vertical form-fill-seal machines. Conversely, LLDPE cannot match the clarity, temperature resistance, and food-contact extraction profile of a PP terpolymer. In coextruded BOPP film, SEP-750 can be used as the heat-seal skin after transverse orientation; the low crystallisation rate of the terpolymer reduces the haze generated during biaxial stretching, but the film producer must manage blocking because the low-melting surface is tacky at ambient warehouse temperatures above 35 °C.
Compliance status should be obtained from the producer. For food-contact use, polypropylene terpolymer grades are generally assessed under FDA 21 CFR 177.1520 for olefin polymers and under Commission Regulation (EU) No 10/2011, which sets overall migration and specific migration limits; the finished converter must verify that the additive package, not only the base resin, meets the intended conditions of use. REACH compliance requires confirmation that substances of very high concern are present below 0.1 wt% at article level. RoHS Directive 2011/65/EU applies only where the finished article falls within electrical and electronic equipment categories; a raw polymer does not independently establish RoHS compliance.
PP terpolymer is not hygroscopic, but surface condensation can occur if cold pellets are exposed to humid plant air. If storage relative humidity exceeds 60% and visible surface moisture is present, dry at 70–80 °C for 2 h in a desiccant dryer with a dew point of -20 °C or lower before extrusion. Avoid blending SEP-750 with amine-based additives or excessive peroxide masterbatches; uncontrolled visbreaking can raise melt flow rate beyond the intended window, lower melt strength, and broaden the seal-initiation response. The resin should not be processed at melt temperatures above 275 °C for extended residence times above 10 min, because gel formation and yellowing may occur even if the initial MFR is unchanged.
Seal initiation and seal strength values for SEP-750 must be compared only when film fabrication conditions are fixed. Cast film made with a chill roll at 15 °C can show a seal initiation 2–4 K lower than film made at 30 °C, because rapid quenching suppresses secondary crystallisation. Seal jaw temperature calibration with a thermocouple grid is required; a temperature gradient of ±3 °C across the jaw can obscure the apparent seal initiation by several Kelvin. On horizontal form-fill-seal lines, the most common field failure mode for ternary PP sealant layers is not resin degradation but seal-bar contamination. Low-molecular-weight additives and terpolymer oligomers can transfer to the heated jaw after continuous operation, reducing the effective jaw temperature and shifting the apparent seal initiation upward. Cleaning schedules based on the number of cycles, rather than visual haze alone, are required; a product-specific validation run should include peel tests under ASTM F88/F88M-21 every 30 min of production to detect seal-strength drift.
