| HS Code | 640894 |
| Density | 0.91 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 10 g/10min |
| Tensile Stress At Yield | 35 MPa |
| Elongation At Yield | 12% |
| Flexural Modulus | 1450 MPa |
| Izod Impact Notched 23 C | 3.5 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 100 °C |
| Vicat Softening Temperature 10n | 150 °C |
| Melting Point | 161 °C |
| Rockwell Hardness | R 95 |
As an accredited TIPPLEN PP Homopolymer H 681 F factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as free-flowing pellets in 25 kg polyethylene-lined bags, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading of TIPPLEN PP Homopolymer H 681 F: 25-kg bags shrink-wrapped on pallets, containerized for safe, efficient transport. |
| Shipping | TIPPLEN PP Homopolymer H 681 F ships as non-hazardous polypropylene granules in sealed woven PP bags, typically 25 kg each, on pallets. Protect from moisture, direct sunlight, and excessive heat during transit. Use standard dry containers or covered trucks. Store in a cool, ventilated area away from ignition sources. |
| Storage | Store TIPPLEN PP Homopolymer H 681 F in a cool, dry, well-ventilated area away from direct sunlight, moisture, heat, and ignition sources. Keep packaging tightly closed to prevent contamination and static buildup. Avoid extended UV exposure and high temperatures. Stable under normal storage conditions; follow manufacturer’s guidelines for shelf life and handling. |
| Shelf Life | Shelf life is indefinite when stored in a cool, dry place away from direct sunlight and moisture. |
On single-layer cast film lines equipped with 1,200–1,600 mm slot dies and internally deckled mandrels, TIPPLEN PP Homopolymer H 681 F is processed at melt temperatures of 230–260°C, with adapter and die zones maintained at 240–255°C and the melt curtain pinned by a dual-chamber air knife to a polished chill roll held at 15–30°C; an air gap of 80–120 mm is used to balance sheet draw and gauge spread, and transverse gauge profiles are controlled to ±1.5% across the web. Incoming lot melt mass-flow rate is verified to ISO 1133-1:2022 under condition M at 230°C/2.16 kg, density is confirmed to ISO 1183-1:2019, and food-contact compliance is established under FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 Annex II, with overall migration testing executed according to EN 1186-1:2002 for fatty simulants when applicable. Formulation for general cast polypropylene film uses 95–100 wt% of the homopolymer, with anti-block masterbatch added at 1–3 wt% and slip/anti-block concentrate at 0.5–1.5 wt%; antistatic masterbatch is added at 0.5–2.0 wt% only when downstream slitting or bag-forming lines operate above 150 m/min. The cast web is edge-trimmed and wound at 18–60 µm, and terminal product types include lamination base film, textile bag overwrap, bakery film, and stationery film; a processing limitation occurs when anti-block masterbatch is overdosed above 5 wt% because surface roughness measured by interferometric profilometry reduces subsequent solventless lamination bond strength and must be re-qualified by ASTM F904-16.
Biaxially oriented polypropylene film production with TIPPLEN PP Homopolymer H 681 F on sequential stretching lines of 6.5–8.2 m stenter width requires melt temperatures of 235–255°C, with the cast sheet quenched on a chill roll maintained at 25–35°C to suppress spherulitic growth before orientation. Food-contact BOPP base webs are qualified under FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 Annex II, while tensile properties are tested to ISO 527-3:2018, haze to ASTM D1003-21, and thickness profiles to ISO 4593:2019. The core-layer formulation comprises 90–98 wt% homopolymer resin, 2–5 wt% anti-block masterbatch, 0.5–1.5 wt% slip/anti-block concentrate, and 0.5–2.0 wt% antistatic concentrate when overwrap equipment requires a static decay time below 2.0 s measured by EN 61340-2-3:2016. Machine-direction orientation is performed at 120–145°C with draw ratios of 4.0–6.0, followed by transverse-direction orientation in a tenter oven at 150–165°C with draw ratios of 7.0–10.0; production-scale data from 6.7 m and 8.2 m tenters show that oven zone deviation exceeding ±5°C relative to setpoint induces transverse gauge bands above ±5% of nominal thickness, and non-contact capacitance gauges are deployed every 50 m to detect the onset of periodic profile disturbance. Corona treatment is applied immediately before wind-up to a surface tension of 38–44 mN/m using ISO 8296:2003 test inks because BOPP surfaces below 36 mN/m fail to wet water-based or UV flexographic inks. Terminal product types include 15–40 µm snack packaging base film, pressure-sensitive label faces, overwrap, cigarette pack film, and adhesive tape release liners; limitations arise when recycled core-layer scrap exceeds 20 wt% of core feed because gel count increases and clarity measured by ASTM D1003-21 deteriorates, requiring offline film inspection and reduced recycled content.
In metallized cast polypropylene base film production, TIPPLEN PP Homopolymer H 681 F is constrained to a formulation of 96–100 wt% homopolymer, 0.5–2.0 wt% anti-block masterbatch, and not more than 0.2–0.5 wt% slip masterbatch; migratory erucamide or oleamide compounds above this threshold form a weak boundary layer that reduces aluminium adhesion, so the converter must confirm adhesion before specifying high-slip concentrate. Melt temperatures are held at 230–255°C, the chill roll temperature is raised to 20–35°C, and the film is surface-treated inline to 40–46 mN/m measured by ISO 8296:2003; vacuum metallization is subsequently performed at chamber pressures of 10-3–10-4 mbar with aluminium deposition to an optical density of 2.0–3.0, and the deposited film is monitored for oxygen transmission rate using ASTM D3985-17 or ISO 15105-2:2003 depending on the converting line. Compliance for food-contact structures relies on FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 Annex II, and metal adhesion is evaluated by solvent lamination peel tests following ASTM F904-16 or ISO 11339:2010; a manufacturer-side limitation is that oxygen transmission rate is dominated by aluminium thickness, so any reduction in optical density below 2.0 requires OTR re-testing according to ASTM D3985-17, although published data for this specific grade in high-barrier configurations is limited. Terminal product types include coffee and snack barrier pouches, metallized cheese wrap, decorative gift wrap, and label facestock.
Raffia tape production from TIPPLEN PP Homopolymer H 681 F begins with cast film extrusion at melt temperatures of 220–250°C through a flat die, followed by water-bath or chill-roll quenching at 20–40°C; the cast web is slit into 2–6 mm tapes and stretched in hot-air ovens at 120–160°C at draw ratios of 5.0–8.0, with annealing on heated godets at 80–110°C to control tape shrinkage. Production-scale extrusion on 110–135 tape positions has shown that oven temperature asymmetry of ±3°C across the web creates denier variation exceeding ±5% and increases the risk of draw resonance in the form of cyclic thickness oscillation; therefore, the oven profile is maintained with closed-loop thermocouple control and precision godet speed regulation to 0.5%. Formulation for woven sacks and flexible intermediate bulk containers uses 85–97 wt% homopolymer, 2–8 wt% calcium carbonate masterbatch, 2–4 wt% UV stabilizer masterbatch, and 1–4 wt% pigment masterbatch; CaCO₃ masterbatch addition above 8 wt% reduces tape tenacity in tensile testing performed to ISO 527-3:2018 or ASTM D882-18 and increases the rejection rate on circular loom weaving. Compliance for industrial sacks falls under REACH Regulation (EC) No 1907/2006 and, for food-contact inner bags or liners, FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 Annex II; UV resistance is qualified by ISO 4892-2:2013 with exposure cycles specified by the end-use region. Terminal product types include woven polypropylene sacks, flexible intermediate bulk containers, carpet backing, and bundling twine; operational boundaries include the use of pre-dried CaCO₃ and UV masterbatches when ambient relative humidity exceeds 60%, because moisture volatilization causes bubble and void defects in the cast web.
In water-bath monofilament extrusion, TIPPLEN PP Homopolymer H 681 F is processed at melt temperatures of 220–245°C through spinnerets with hole counts between 40 and 200, using a quench bath maintained at 20–45°C and a post-bath air gap of 300–800 mm before the first heating stage; the extrudate is subsequently drawn in hot water or air ovens at 110–135°C with total draw ratios of 7.0–12.0, and relaxed by 5–10% on annealing godets at 100–120°C to balance tensile strength and elongation. Incoming lot MFR is verified by ISO 1133-1:2022 condition M, and the final monofilament is tested for tensile properties to ISO 527-1:2019, ISO 527-2:2012, or ASTM D2256-21 depending on filament diameter. Formulation for agricultural and technical yarn applications uses 90–98 wt% homopolymer, 2–5 wt% UV stabilizer masterbatch, 1–3 wt% pigment masterbatch, and 0.5–1.5 wt% processing aid masterbatch; the processing aid is reduced or omitted when filament diameter exceeds 0.8 mm because excessive lubricant migration can lower friction on draw godets and cause wrap instability. Compliance under REACH Regulation (EC) No 1907/2006 and, for food-contact netting or tying applications, FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011 Annex II applies; outdoor weatherability is evaluated by ISO 4892-2:2013. Production limitations arise when the bath temperature exceeds 45°C because spherulite size in the quenched filament becomes non-uniform, increasing filament breakage at draw ratios above 8.0; terminal product types include agricultural twine, vineyard tie strings, geotextile yarns, netting, and rope cores.
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In high-modulus film extrusion operations that require a polypropylene core with low comonomer-derived haze and rapid orientation-induced crystallization, TIPPLEN PP Homopolymer H 681 F is specified as a non-ethylene-modified, pelletized homopolymer grade. The product code identifies the homopolymer architecture and the film-extrusion intention; it is positioned for biaxially oriented polypropylene film, cast unoriented polypropylene film, and coextruded structures in which a stiff, printable, or metallizable web is required. Unlike propylene-ethylene random copolymers, this grade does not carry an ethylene fraction, which changes the sealing response, melting behaviour, and processing boundaries of the finished film.
The published nominal release values include a melt flow rate of 2.8 g/10 min measured under ISO 1133-1 at 230 °C and 2.16 kg, and a density of 0.90 g/cm³ measured under ISO 1183-1. The crystalline melting peak of the homopolymer falls within the 160–165 °C range when determined by differential scanning calorimetry under ISO 11357-3. Lot-specific values for melt flow rate, density, tensile properties, impact resistance, and Vicat softening point are reported on the certificate of analysis against the current revision of the relevant ISO method. Published mechanical data for this specific grade are more limited than rheological and density data, and converters should request the current technical data sheet before fixing orientation or sealing parameters.
The absence of ethylene comonomer raises the crystalline melting peak compared with random copolymer film grades, but it also narrows the thermal window in which the cast sheet can be oriented without creating surface defects or thickness variation. The melt temperature is typically controlled between 230 °C and 250 °C in BOPP production. Below 210 °C, high-isotactic homopolymer fractions may remain partially unmelted and can raise filtration pressure or generate optical gels in thin films. Above 260 °C, polypropylene homopolymer undergoes oxidative chain scission, which reduces extensional viscosity and broadens the molecular weight distribution; prolonged residence at that temperature therefore creates draw resonance and gauge variation.
With a tenter-frame BOPP line, the cast sheet is normally quenched on a chill roll held between 15 °C and 30 °C to limit the growth of large spherulites before orientation. Machine-direction orientation is typically applied at draw ratios of 4.5–5.5, while transverse-direction draw ratios are usually set at 8–10. These values are not unique to H 681 F but reflect the need to balance orientation-induced crystallization against film rupture. Because the grade is a homopolymer, its extensional viscosity under orientation is higher than that of a random copolymer of equivalent melt flow rate, and the tenter oven temperature must be profiled to avoid cold stretch marks or uneven birefringence.
When the same grade is transferred to a cast-film line, chill-roll temperature and air-knife position become the controlling variables. If the cast web is quenched too aggressively, a low-crystallinity skin can form and later produce blocking or poor metallizer adhesion. If the chill roll is too warm, the web may enter the winder with excessive crystallinity and low tear initiation resistance. On single-screw extruders with 25:1–33:1 L/D barrier screws, melt-pressure sensitivity to lot-to-lot melt-flow drift is most visible at the screen changer and die. A reduction of 0.2 g/10 min in melt flow rate can raise die pressure by approximately 5–12 bar at constant throughput, which is within normal batch-to-batch variation but must be managed through barrel temperature profiling rather than by excessive screw-speed override.
Pre-drying of polypropylene homopolymer is not mandatory when packaging remains sealed and the material is kept below the local dew point. If open storage exceeds 60 % RH, surface condensation can introduce moisture that appears as splay or surface haze in thin film. Under those conditions, hot-air drying at 70–80 °C for 2–4 h is sufficient. Because the polymer is non-hydrolytic, extending drying time does not correct polymer degradation and may worsen oxidative yellowing if high-residence hot-air hoppers are used.
Substitution of H 681 F for a random copolymer in the core or print web changes the sealing architecture of the final film. The homopolymer does not heat-seal below 130 °C; a coextruded random copolymer skin layer or a sealable coating is therefore required for heat-seal packaging. In return, the homopolymer provides higher modulus, lower moisture transmission after biaxial orientation, and a sharper melting peak that supports stable tenter processing at higher oven temperatures. The comparative differences against common polypropylene film and impact grades are summarized below.
| Property or characteristic | H 681 F homopolymer | Random copolymer film grade | Heterophasic impact copolymer |
| Ethylene comonomer content | none | 1–4 wt% | 8–25 wt% ethylene-propylene rubber phase |
| Melting peak range | 160–165 °C | 130–148 °C | 160–165 °C matrix with secondary lower-temperature transitions |
| Flexural modulus class | 1,400–1,600 MPa | 800–1,200 MPa | 800–1,300 MPa |
| Heat-seal initiation | not heat-sealable below 130 °C | 110–125 °C | limited; sealant skin layer required |
| Low-temperature impact resistance | low | moderate | high |
| Optical haze after orientation | low | low | higher when rubber content increases |
The property comparisons in the table are class ranges based on typical polypropylene film-grade behaviour measured under ISO 527-2, ISO 179-1/1eA, and ISO 11357-3. They are not substitutes for the producer’s current specification. For applications requiring measurable low-temperature ductility, such as frozen-food packaging that must survive impact below -20 °C, the homopolymer is generally inferior to heterophasic impact copolymers and should be restricted to non-impact layers or laminates with a high-impact substrate.
Where low-temperature impact resistance is secondary to stiffness and water-vapour barrier, H 681 F is preferred over random copolymers because the ethylene-free backbone permits higher orientation-induced crystallinity and lower equilibrium moisture transport. This distinction is operationally relevant in coextruded BOPP where the core layer must support the draw forces of the tenter while the skin layer provides sealing. H 681 F is also used as a print web or metallizable layer where high surface gloss and low oligomer migration are required, but published data for this specific configuration is limited. Converters should request extractable-content, ash-content, and additive-package documentation for metallization trials.
Regulatory documentation must be verified for the final article, not for the pellet alone. Polypropylene homopolymer may comply with Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520 under specified end-use conditions, but the overall migration limit and specific migration limits apply to the finished film or container. Under EU food-contact rules, overall migration is limited to 10 mg/dm², with 60 mg/kg applicable for infant-food contact when the relevant simulant and test conditions are applied. Compliance therefore depends on layer structure, additives, printing inks, coatings, and migration-testing conditions.
Incompatibilities are operationally relevant in coextrusion and maintenance. The grade should not be purged with chlorinated solvents, and strong oxidizing acids, high concentrations of aromatic hydrocarbons, and halogenated cleaning agents should be avoided because they can swell or degrade polypropylene surfaces. Continuous exposure to ultraviolet radiation without sufficient light stabilizer will reduce molecular weight and cause visible chalking or embrittlement. Melt temperatures above 260 °C should be limited to short residence times to avoid chain scission, peroxide formation, and loss of extensional viscosity in the oriented web.
In metallized BOPP production, H 681 F is selected for the metallizable high-modulus layer because the ethylene-free chain sequence supports high gloss after orientation and reduced surface roughness after corona treatment. Metallizer optical density targets must be established by pilot trials, and the producer’s certificate of analysis should be checked for extractables and low-molecular-weight oligomers that may affect metal adhesion. Published data for vacuum-metallizer deposition rates on this grade is limited, so converter qualification should include at least three consecutive batches and film from both edge and centre positions before optical density is fixed below 2.0 OD.
