| HS Code | 912307 |
| Melt Flow Rate 230 C 2 16 Kg | 10 g/10min |
| Density | 0.9 g/cm³ |
| Tensile Strength At Yield | 27 MPa |
| Elongation At Break | 200% |
| Flexural Modulus | 1000 MPa |
| Izod Impact Strength Notched 23 C | 5 kJ/m² |
| Rockwell Hardness | R90 |
| Heat Deflection Temperature 0 45 Mpa | 95 °C |
| Vicat Softening Temperature | 130 °C |
| Melting Point | 145 °C |
As an accredited SEETEC™ PP Terpolymer T3450M factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SEETEC™ PP Terpolymer T3450M is supplied as pellets in 25 kg moisture-resistant bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL: PP Terpolymer T3450M packed in 25kg bags, palletized, container loaded and secured for safe transport. |
| Shipping | SEETEC™ PP Terpolymer T3450M ships as non-hazardous plastic pellets in moisture-resistant packaging. Use dry, clean containers or hopper trucks; protect from rain, contamination, and excessive heat. Store away from ignition sources, and handle with standard conveying equipment. Keep packaging intact to preserve product quality during transit. |
| Storage | Store SEETEC™ PP Terpolymer T3450M in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture contamination and airborne dust accumulation. Avoid stacking near exits or incompatible materials. Under proper conditions, shelf life is typically one year from receipt. |
| Shelf Life | Shelf life is two years from manufacture when stored in original, unopened packaging in a cool, dry place. |
In a three-layer coextruded cast polypropylene film line running at 120–180 m/min for vertical form-fill-seal packaging of dry snack foods, the sealant web is assigned to the chill-roll side at 6–12 μm of a total thickness between 25 μm and 50 μm. SEETEC™ PP Terpolymer T3450M is processed on a 75 mm or 90 mm single-screw extruder fitted with a 30:1 L/D barrier screw and a static mixer in the adapter, with barrel zones from 200 °C to 240 °C, die temperature 230–240 °C, and polished chill roll temperature 18–24 °C. The sealant-layer formula is either 100 wt% T3450M or a 70–90 wt% blend of T3450M with a propylene-ethylene random copolymer where higher web stiffness is needed; slip/antiblock concentrate is added at 2–4 wt% of the sealant layer only, and the erucamide migration time must be controlled because seal strength tested before 48 h of bloom can understate the final sealing plateau. Food-contact compliance is anchored to 21 CFR 177.1520(c) for propylene copolymers and to Commission Regulation (EU) No 10/2011, with overall migration tested at 40 °C for 10 days and limited to 10 mg/dm² for aqueous and fatty simulants. After quenching, the film is corona treated to 38–42 mN/m and slit for use as the sealant web in pouches of biscuits, confectionery, and dried fruit; seal strength is verified according to ASTM F88/F88M-21 using a jaw temperature of 125–140 °C, dwell time 0.3–0.5 s, and pressure 0.3–0.5 MPa, while hot tack is measured on a J&B hot tack tester according to ASTM F1921-18 to confirm that the seal does not open before solidification on the form-fill-seal line.
A dairy lidding film is coextruded as a three- or four-layer cast web in which T3450M forms the 8–15 μm sealant layer of a 20–40 μm total structure; the balance includes a polypropylene homopolymer core and, where oxygen barrier is required, an EVOH layer with maleic anhydride grafted tie layers. The sealant layer is formulated with 80–90 wt% T3450M and 10–20 wt% of a higher-ethylene random copolymer or polybutylene to shift the failure mode from destructive weld to controlled peel; the exact ratio is fixed after peel-force trials because lowering T3450M below 80 wt% can raise the seal initiation beyond the limit set by the cup rim geometry. Sealing is performed on high-speed tray lidding machines at jaw temperatures of 135–150 °C, dwell 0.4–0.8 s, and pressure 0.3–0.5 MPa; the seal must form through condensed moisture and dairy fat on the rim without delaminating the EVOH layer. Regulatory verification follows EU Regulation (EU) No 10/2011 for fatty food simulants and FDA 21 CFR 177.1520(c) for polypropylene copolymers; the converter must also evaluate organoleptic neutrality under ISO 13302:2003 because taint transfer into high-fat dairy products is a rejection criterion. The finished lidding film is die-cut and supplied for PP cups containing yoghurt, desserts, and sour cream; seal strength is measured by ASTM F88/F88M-21, and a seal-through-contamination test with 1 wt% yoghurt solids on the rim is used to verify line robustness.
| Downstream segment | Key compliance reference | Test or verification method | Critical process control |
|---|---|---|---|
| Dry food CPP sealant web | 21 CFR 177.1520(c); EU No 10/2011 | ASTM F88/F88M-21; ASTM F1921-18 | Sealant layer 6–12 μm; chill roll 18–24 °C |
| Dairy lidding film | 21 CFR 177.1520(c); EU No 10/2011 | ASTM F88/F88M-21; ISO 13302:2003 | Jaw 135–150 °C; dwell 0.4–0.8 s |
| Medical EtO pouch | ISO 11607-1:2019; ISO 11607-2:2019; ISO 11135:2014 | ASTM F88/F88M-21; ASTM F1929-15 | Seal 115–125 °C; blow-up ratio 2.0–2.5 |
| BOPP sealant skin | 21 CFR 177.1520(c); EU No 10/2011 | ASTM F88/F88M-21; ASTM D1003-21; ASTM D2457-13 | TD preheat ±3 °C |
| Thermal lamination film | REACH Article 33; EN 71-3:2019+A1:2021 | ISO 11339:2010 | Roll 100–120 °C; speed 10–30 m/min |
Ethylene oxide sterilization of medical device pouches requires a sealant layer that can be closed at 115–125 °C so that the PETG or polystyrene tray inside the pouch does not distort, and T3450M is coextruded as the seal layer in a water-quenched blown film line at 15–25 μm of a 50–75 μm three-layer structure; the core and outside layers are high-stiffness polypropylene random copolymer. The blown film process uses a 1.2 mm die gap, blow-up ratio 2.0–2.5, melt temperature 190–210 °C, and water-ring quench, followed by corona treatment to 38–44 mN/m for lamination or printing. Regulatory control is defined by ISO 11607-1:2019 and ISO 11607-2:2019 for sterile barrier systems, ISO 11135:2014 for ethylene oxide process validation, and ISO 10993-7:2008 for residual ethylene oxide and ethylene chlorohydrin limits after aeration. Peel integrity is tested before and after sterilization by ASTM F88/F88M-21 and dye penetration by ASTM F1929-15; the seal must remain continuous after 55 °C EtO exposure and aeration, because post-sterilization brittle seal failure is a common rejection in pouches that show acceptable pre-sterilization values. If radiation sterilization is requested instead, published data for T3450M at 25 kGy and above is limited; validation under ISO 11137-1:2020 must include tensile retention and seal-strength retention because polypropylene undergoes radiation-induced chain scission and oxidative embrittlement unless stabilizer packages are explicitly designed for that dose. The final product is a chevron peel pouch or header bag for single-use surgical instruments, syringes, or catheter kits.
On a sequential biaxially oriented polypropylene film line, a cast sheet of 250–800 μm carries a T3450M skin of 8–15 wt% of the total thickness, resulting in a final oriented skin of 0.8–1.5 μm. Machine-direction stretching is run at 140–150 °C with a draw ratio of 4.5–5.0, and transverse-direction stretching is run at 155–165 °C with a draw ratio of 8–10; the low melting peak of T3450M makes roll wrap and blocking a processing risk, and the transverse-direction preheat zone must be held within ±3 °C to prevent skin adhesion to the tenter clips and annealing rolls. After orientation, the sealant skin is corona treated to 36–40 mN/m and the film is slit for snack packaging lines that require low-temperature fin seals at 120–130 °C; because orientation raises seal initiation relative to the cast sheet, the final seal plateau must be verified on oriented film and not on the coextruded sheet. Food-contact status follows 21 CFR 177.1520(c) and EU Regulation (EU) No 10/2011, and batch release testing includes ASTM F88/F88M-21 seal strength, ASTM D1003-21 haze, and ASTM D2457-13 gloss at 45°. The final BOPP web is used for confectionery, crisps, and dry snack packages with fin-seal and lap-seal formats.
For print finishing and book cover lamination, a three-layer cast polypropylene web is coextruded with a glossy or matte homopolymer face and a T3450M sealant layer of 8–15 μm on a 20–30 μm total thickness; the face layer carries a corona treatment of 36–40 mN/m for printing or cold foil adhesion, while the sealant layer remains untreated to prevent blocking on the roll. Lamination to printed paper or cardboard is performed on heated-roll laminators at 100–120 °C, speed 10–30 m/min, and nip pressure 0.3–0.5 MPa; the sealant layer softens and fills the surface roughness of the paper without requiring an additional adhesive. The process window is widest with clay-coated paper surfaces at 5–8% moisture content; uncoated high-filler papers may require a higher laminator roll temperature or a corona pre-treatment on the paper. Compliance for this non-food segment is based on REACH Article 33 SVHC declarations and, where children’s printed matter is supplied, on EN 71-3:2019+A1:2021 migration limits for certain elements from the finished laminate. The final product is slit onto cores for thermal laminating of book covers, brochures, gift boxes, and packaging labels; adhesion is checked by a peel test after lamination according to ISO 11339:2010.
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SEETEC™ PP Terpolymer T3450M is a reactor-grade propylene-ethylene-butene-1 terpolymer supplied for coextruded cast film sealant layers, extrusion coating, and lamination webs where low-temperature heat sealing, hot-tack force, and optical clarity are controlled at high line speeds. Typical published datasheet values include a melt flow rate of 5.0 g/10 min determined under ASTM D1238-20 at 230 °C/2.16 kg, a density of 0.90 g/cm³ under ISO 1183-1:2019, a tensile yield stress of 22.0 MPa under ASTM D638-14 at 50 mm/min, and a flexural modulus of 850 MPa under ISO 178:2019. Differential scanning calorimetry under ISO 11357-3:2018 typically records a melting peak near 132 °C. The grade differs from propylene-ethylene random copolymers by the inclusion of butene-1 as an additional comonomer, which shifts the seal initiation temperature downward by approximately 8–15 °C and broadens the crystallization exotherm. T3450M is not specified for retort pouches that require sustained 121 °C saturated steam resistance.
Measured at a heating rate of 10 °C/min under ISO 11357-3:2018, the melting endotherm of T3450M is broadened and displaced relative to a polypropylene homopolymer. The main melting peak is normally reported near 132 °C, while the crystallization exotherm on cooling at 10 °C/min peaks in the region of 85–90 °C. The breadth of the crystallization exotherm is a direct consequence of the statistical distribution of ethylene and butene-1 units across the polymer chain; this heterogeneity retards spherulitic growth and produces a wider lamellar thickness distribution than a homopolymer or a conventional ethylene-propylene random copolymer. The thermal effect translates into seal performance because a lower onset of melting permits the sealant surface to wet and interdiffuse across the jaw interface at lower jaw temperatures. The non-isothermal crystallization half-time at a cooling rate of 10 °C/min is generally longer than that of a homopolymer; this slower crystallization permits sufficient melt relaxation across the air gap and reduces web curl in asymmetric constructions. However, the slower crystallization also increases the minimum chill roll contact length required before edge trimming; chill roll wrap angles below 180° may allow the cast web to retain latent heat and lead to roll blocking during winding. Hot-tack force is evaluated according to ASTM F1921-12 on a 30 µm monolayer cast film with a 0.2 s dwell and 0.2 MPa seal pressure; measurable hot-tack force typically emerges above 105 °C and continues to increase across the 115–130 °C range before failure mode shifts from interfacial peel to film-edge tear. Heat-seal strength under ASTM F88/F88M-21 generally exceeds 4 N/25 mm at seal temperatures above 120 °C when the film is cooled under controlled tension; however, published data for this specific configuration is limited for seal layers below 5 µm. The lower melt onset also reduces the thermal energy input required on sealing jaws running at 60 packages/min or faster, but it narrows the upper processing window for hot-fill and pasteurization.
On a three-layer cast film coextrusion line with a 90 mm primary extruder operating at L/D 30:1, barrel zone temperatures are typically set from 210 °C to 250 °C between the feed throat and the metering section, with adapter and flat die temperatures maintained at 240–255 °C. The melt temperature at the die exit is controlled at 235–245 °C; excursions above 280 °C initiate chain scission, reduce hot-tack force, and cause die-lip deposit accumulation. A flat die gap of 0.3–0.5 mm and an air gap of 8–12 cm are used with chill roll temperatures between 18 °C and 28 °C to quench the web without generating surface haze bands. Screw back pressure is normally kept between 100 bar and 150 bar; sustained back pressure above 200 bar raises melt temperature and increases gel formation. Production-scale failure modes observed on cast film lines include draw resonance above 150 m/min if the sealant skin thickness falls below 10 µm, and die-lip build-up from low-molecular-weight fractions when regrind content exceeds 20 wt% without off-line melt filtration. The grade is processed without pre-drying when original sealed containers are stored below 60 % relative humidity; after bulk storage or exposure above 60 % relative humidity, drying for 2 h at 80 °C in a desiccant dryer is applied before cast film extrusion.
Terpolymerization changes the seal initiation point because the butene-1 unit introduces a longer ethyl side branch than ethylene. This side branch is largely rejected from the polypropylene crystal lattice, decreasing the free energy of lamellar thickening and increasing the concentration of tie molecules between adjacent crystallites. In a propylene-ethylene random copolymer, ethylene defects are partly accommodated in the lattice at low concentrations, so the depression of the seal initiation temperature is smaller per mole of comonomer. For T3450M the seal initiation threshold, defined as the jaw temperature producing 0.5 N/25 mm seal force under ASTM F88/F88M-21, is typically reported in the range 108–115 °C depending on film gauge, jaw pressure, and jaw dwell. The same comonomer effect lowers flexural modulus to roughly 850 MPa under ISO 178:2019, compared with 1,200–1,500 MPa for a polypropylene homopolymer, and reduces optical haze below 3 % on 30 µm cast film under ASTM D1003-21 because smaller crystallites scatter less visible light. The increased tie-molecule population also improves hot-tack at short dwell times on high-speed packaging lines, but it reduces the maximum continuous use temperature and makes the sealant more sensitive to blocking in wound rolls if core temperatures exceed 35 °C. In dynamic mechanical analysis at 1 Hz under ISO 6721-1:2019, the storage modulus curve of T3450M shows a lower plateau above 30 °C than that of a random copolymer, reflecting the higher chain flexibility imparted by the butene-1 side group. The loss tangent peak associated with the glass transition is typically broadened, which contributes to a wider service window for adhesion and sealability.
Replacement of a propylene homopolymer skin with T3450M in a three-layer cast film reduces seal initiation temperature by more than 20 °C and improves haze, but lowers flexural modulus and upper service temperature. The homopolymer remains specified where the film is exposed to 121 °C retort or where high bending stiffness is required; T3450M is restricted to low-temperature sealing and lamination. Replacement of a propylene-ethylene random copolymer typically permits a seal-temperature reduction of 8–15 °C and a modest haze improvement under ASTM D1003-21, while the melt processing window remains similar. Relative to metallocene polyethylene plastomers, T3450M retains a higher modulus and a sharper melting point, which improves web-handling and reduces blocking; however, it does not match plastomer sealability below 90 °C. The following table compares the grade to reference polypropylene classes.
| Property | T3450M | PP random copolymer | PP homopolymer | Test method |
|---|---|---|---|---|
| Melt flow rate | 5.0 g/10 min | 5–7 g/10 min | 3–4 g/10 min | ASTM D1238-20 at 230 °C/2.16 kg |
| Melting peak | 132 °C | 135–142 °C | 160–165 °C | ISO 11357-3:2018 |
| Flexural modulus | 850 MPa | 900–1,000 MPa | 1,400–1,600 MPa | ISO 178:2019 |
| Seal initiation threshold | 108–115 °C | 118–125 °C | above 150 °C | ASTM F88/F88M-21 |
| Typical sealant web | low-temperature CPP | general CPP | structural or retort layer | — |
Regulatory documentation for T3450M should be checked against the supplier’s product stewardship declaration. In European food-contact applications, the grade may be assessed under Commission Regulation (EU) No 10/2011; in United States applications, FDA 21 CFR 177.1520 covers olefin polymers, but specific end-use migration testing remains the responsibility of the converter or brand owner. RoHS recast 2011/65/EU and REACH SVHC screening are typically addressed in the supplier’s compliance statement.
On an extrusion coating line producing paper-based flexible packaging, T3450M is applied at 12–20 g/m² coating weight; the extruder barrel profile is set from 180 °C at the feed zone to 245 °C at the die, and the air gap is reduced to 7–10 cm to limit neck-in. Neck-in is measured at the substrate edge and is typically controlled to below 50 mm per side when the melt temperature is below 250 °C. Excessive neck-in above 70 mm indicates degraded melt elasticity and requires a reduction in melt temperature or a die-gap adjustment. The coated web is cooled on a chill roll at 15–20 °C and rewound at a tension below 100 N/m to prevent blocking of the sealable surface. Lab-scale evaluations of adhesion use ASTM F904-16 on 25 mm strips; bond strength values above 3.0 N/15 mm are generally sufficient for dry food pouches, but published data for this specific configuration is limited for high-barrier metallized substrates.
When T3450M is used as a sealant skin on biaxially oriented polypropylene base film, the seal layer is applied either by coextrusion before orientation or by offline extrusion coating after orientation. The coextrusion route requires the terpolymer skin to survive transverse stretching at 140–150 °C without sticking to clips; slip and antiblock loadings are therefore adjusted upward to 1,500–2,500 ppm of synthetic silica or polymethylmethacrylate particles. The offline route uses a die temperature of 240–250 °C and corona treatment above 38 mN/m to promote adhesion to the oriented base web. Incompatibilities are observed with amine-based antifog additives; under high humidity and extended storage, these additives can hydrolyze and form amine species that accelerate surface oxidation and reduce seal strength after 6 months of warehouse aging. Slip additive migration to the film surface follows diffusion kinetics governed by film crystallinity and storage temperature; the lower crystallinity of T3450M accelerates migration relative to a homopolymer, but the presence of butene-1 comonomer also lowers amorphous-phase density and can alter the plateau coefficient of friction after 48 h at 25 °C. The grade should not be blended with high levels of linear low-density polyethylene in the sealant layer if low seal initiation is the controlling specification; above 10 wt% linear low-density polyethylene, the seal threshold may rise by 3–5 °C and haze may increase under ASTM D1003-21.
Substitution of T3450M for a random ethylene-propylene copolymer in an existing sealant web may be carried out without changing the extruder screw geometry, provided the screw is a barrier design with L/D 30:1 or greater. The lower melting peak allows a melt-temperature reduction of 5–10 °C relative to the random copolymer, which generally lowers oxidation and die-lip build-up. The quench roll temperature must be maintained below 28 °C because the terpolymer’s slower initial crystallization increases the risk of blocking in wound rolls if the core temperature exceeds 35 °C during winding. Before approval, seal strength is mapped from 95 °C to 135 °C in 5 °C increments using flat sealing jaws, and hot-tack force is measured by ASTM F1921-12 at 0.2 s dwell to confirm that the terpolymer does not sacrifice hot-tack at high line speed. On high-speed vertical form-fill-seal machines running above 60 packages/min, actual jaw dwell may fall below 0.1 s, so laboratory data collected at 0.5 s dwell are not predictive. The specification limit for coefficient of friction during conversion is typically held between 0.2 and 0.4 under ISO 8295:1995; if slip additive migration is incomplete, initial coefficient of friction above 0.5 causes film feed irregularities on form-fill-seal machines. In extrusion lamination, the terpolymer is processed at 235–245 °C melt temperature with a die gap of 0.4–0.6 mm; adhesion to aluminium foil and paper is evaluated by peel testing under ASTM F904-16, and bond strengths below 1.5 N/15 mm usually indicate inadequate oxidation or insufficient corona treatment rather than a limitation of the terpolymer itself. Gels and fisheyes are quantified by optical surface scanning on cast film lines with a threshold of 0.25 mm; counts above 5 per m² trigger an investigation of melt filtration and regrind quality. Consistent slip additive dispersion requires online gravimetric dosing at 0.1–0.3 wt%; overdosing above 0.5 wt% can reduce seal strength and increase coefficient of friction variability.
