| HS Code | 593580 |
| Density | 0.905 g/cm³ |
| Melt Flow Rate | 25 g/10 min (230°C, 2.16 kg) |
| Tensile Strength At Yield | 35 MPa |
| Elongation At Yield | 11% |
| Flexural Modulus | 1600 MPa |
| Charpy Impact Strength Notched 23c | 3 kJ/m² |
| Charpy Impact Strength Notched Minus 20c | 1.5 kJ/m² |
| Rockwell Hardness | R110 |
| Heat Deflection Temperature 0 45 Mpa | 100°C |
| Vicat Softening Temperature | 155°C |
| Melting Point | 165°C |
| Water Absorption 24h | 0.02% |
As an accredited SIBUR PP Homopolymer PP H250 GP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SIBUR PP Homopolymer H250 GP is supplied in 25 kg polyethylene-lined paper bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL: SIBUR PP H250 GP polypropylene pellets packed in 25kg bags on pallets, securely stowed for transport. |
| Shipping | SIBUR PP Homopolymer H250 GP is shipped as free-flowing granules in moisture-proof bags or bulk containers. Ensure dry, ventilated conditions, avoiding direct sunlight and temperatures above 50°C. This non-hazardous material should be handled with standard PPE and protected from impact or contamination during transport. |
| Storage | Store SIBUR PP Homopolymer PP H250 GP in a dry, clean, well-ventilated area, protected from direct sunlight, heat, and ignition sources. Keep original packaging sealed to prevent contamination and moisture pickup. Maintain moderate ambient temperatures and avoid prolonged UV exposure. Handle carefully to avoid damaging bags; suitable storage preserves product quality and processing performance. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Shelf life is typically 12 months from date of manufacture. |
Injection moulding of SIBUR PP H250 GP into thin-wall food-contact containers and lids on high-speed stack mould systems requires direct control over melt temperature, injection velocity, and holding pressure. The grade is specified with a nominal melt flow rate of 25 g/10 min determined under ISO 1133-1:2022 at 230 °C and 2.16 kg, which places it in the high-flow range for general-purpose homopolymers. In a stack mould with 16+16 or 24+24 cavities and a wall thickness of 0.6 mm to 1.1 mm, the flow length-to-wall thickness ratio can exceed 200:1 when gate design uses a hot runner with isolated manifold temperatures of 235 °C to 245 °C. Injection speed is typically set between 300 mm/s and 600 mm/s on electric or hybrid injection units; insufficient injection velocity produces premature freeze-off at the flow front and visible sink marks near the gate, while excessive velocity increases shear heating and may generate molecular orientation that distorts round lids after demoulding. Holding pressure is maintained at 35 MPa to 55 MPa hydraulic pressure for a duration of 0.8 s to 2.0 s per mm of nominal wall thickness, with gate seal verified by part weight stability within ±0.3%. Mould temperature is controlled between 10 °C and 30 °C using turbulent water circuits with a Reynolds number above 4000; higher mould temperatures reduce residual stress but increase cycle time because the homopolymer has a heat deflection temperature below 100 °C under ISO 75-2 method A. Food-contact compliance relies on the polymer matrix meeting EU Regulation 10/2011 Annex I and FDA 21 CFR 177.1520(c) for olefin polymers; however, each formulated compound or masterbatch must be evaluated separately under EN 1186-1 migration testing because additives and processing aids can shift overall migration. Colour concentrates used in thin-wall packaging should be based on the same PP carrier and must not introduce zinc stearate above 0.05 wt% where organoleptic testing is specified for dairy applications. The principal processing limitation is warpage from anisotropic shrinkage; PP H250 GP has an unfilled mould shrinkage range of 1.2% to 1.8% depending on flow direction and mould cooling uniformity, and parts with deep draw or large flat areas require careful balancing of cooling channels to avoid differential shrinkage above 0.3 percentage points between rim and base.
| Parameter | Thin-wall container ≤0.8 mm | Lid or shallow container 1.0 mm–1.5 mm |
|---|---|---|
| Melt temperature | 235 °C–255 °C | 230 °C–250 °C |
| Mould temperature | 10 °C–25 °C | 15 °C–35 °C |
| Injection velocity | 350 mm/s–700 mm/s | 200 mm/s–450 mm/s |
| Holding pressure | 40 MPa–60 MPa | 30 MPa–50 MPa |
| Back pressure | 2 MPa–5 MPa | 2 MPa–6 MPa |
Continuous production of injection-moulded caps and closures for still beverages and non-carbonated liquid products is constrained by build-up of low-molecular-weight fractions on venting surfaces and by closure dimensional stability after ejection. Closure designs with tamper-evident bands joined by frangible bridges have wall sections between 0.4 mm and 0.9 mm; bridge thickness is commonly 0.12 mm to 0.25 mm, and rupture behaviour is influenced by the notch produced at the parting line. Moulds are typically operated at melt temperatures of 220 °C to 250 °C and cooling water temperatures of 8 °C to 20 °C, achieving cycle times below 6 s on 48-cavity tools. In sustained production, the main failure modes are ejection pin push marks on the closure top face when melt temperature exceeds 255 °C, and ovality above 0.3 mm on the outer diameter when the cooling circuit is unbalanced. Removal torque testing is product-specific; no single ISO standard defines the passing limit, but dimensional acceptance sampling can follow ISO 2859-1. PP H250 GP is a homopolymer and therefore exhibits lower environmental stress crack resistance than random copolymers; closures for contents with higher surface-active ingredients or for hot-fill above 60 °C are outside the recommended operating envelope unless a post-moulding annealing step is introduced. Food-contact status is assessed under EU Regulation 10/2011 and FDA 21 CFR 177.1520, but specific migration limits apply to the finished closure when a liner is present.
Polypropylene homopolymer with a nominal 25 g/10 min melt flow rate can be processed on spunbond nonwoven lines to produce hygiene, filtration, and packaging fabrics. In this configuration, the polymer is melted in a single-screw extruder with a barrier screw and filtered through a melt screen pack of 40 μm to 60 μm before entering a metering pump. The melt is delivered to a spinneret with hole diameters between 0.25 mm and 0.40 mm at melt temperatures of 230 °C to 245 °C. The high-flow homopolymer reduces die pressure compared to 18 g/10 min grades, but it also reduces melt strength. Spin line stability is required at draw ratios above 150:1; if air quench temperature and velocity are not precisely controlled, filament breaks increase sharply. Draw resonance appears as periodic diameter fluctuations along the filament bundle and can be observed at high throughputs above 0.7 g/hole/min depending on spinneret hole density and quench air uniformity. Fabric produced from PP H250 GP has a filament diameter distribution typically between 15 μm and 22 μm; basis weight is set by collector speed and throughput. Tests are performed according to ISO 9073-1 for basis weight, ISO 9073-2 for thickness, and ISO 9073-18 for tensile properties. Because the grade is a homopolymer, the nonwoven fabric has a relatively narrow thermal calendering window; calender roll temperature must be kept between 145 °C and 155 °C, and a variation above 2 °C across the roll width can produce uneven bond points with reduced tensile strength. Published data for the exact die pressure profile of PP H250 GP on multi-beam spunbond systems is limited; line trials are required to map pressure versus throughput for a given spinneret geometry.
In a 40:1 L/D co-rotating twin-screw extruder with screw diameter of 65 mm to 92 mm, SIBUR PP H250 GP is fed into the main hopper, while surface-treated talc is introduced through a side feeder at the L/D 28 position to limit particle attrition and devolatilization losses. At talc loadings of 10 wt% to 40 wt%, the compound melt flow rate falls from the base value of 25 g/10 min to a range that may extend below 10 g/10 min at the higher filler level, particularly when fine talc with a median particle size below 2 μm is used. A maleic anhydride grafted polypropylene coupling agent is added at 1 wt% to 3 wt% to promote interfacial adhesion; without this coupling agent, tensile yield strength and flexural modulus are lower and the compound exhibits brittle failure at low deformation. The melt temperature along the barrel is controlled between 200 °C and 230 °C, with the final die temperature restricted to 220 °C to reduce thermal degradation of the coupling agent. Mechanical property requirements for automotive interior substrates are usually evaluated under ISO 527-2 for tensile properties, ISO 178 for flexural modulus, and ISO 179-1/1eA for Charpy notched impact strength. A talc-filled compound based on PP H250 GP can achieve a flexural modulus above 2500 MPa at 20 wt% talc and above 3500 MPa at 40 wt% talc, but notched Charpy impact strength at 23 °C typically remains below 5 kJ/m² and drops below 2 kJ/m² at -30 °C. The operational boundary is therefore at low-temperature impact; components requiring ductile failure below -10 °C should use an impact copolymer base rather than PP H250 GP. In production, the main processing conflict is the increase in melt pressure at the die plate when filler level exceeds 35 wt%, which may require screen pack changes and vacuum venting at -0.08 MPa to remove moisture introduced by the talc.
| Talc loading | Flexural modulus ISO 178 | Charpy notched impact at 23 °C ISO 179-1/1eA | MFR after compounding ISO 1133-1 |
|---|---|---|---|
| 0 wt% | 1200 MPa–1500 MPa | 2 kJ/m²–4 kJ/m² | 25 g/10 min nominal |
| 20 wt% | 2400 MPa–2800 MPa | 3 kJ/m²–5 kJ/m² | 15 g/10 min–20 g/10 min depending on talc grade |
| 40 wt% | 3300 MPa–3800 MPa | 2 kJ/m²–4 kJ/m² | 8 g/10 min–15 g/10 min depending on talc grade and coupling agent |
Household appliance trim components with limited load-bearing requirements are moulded from PP H250 GP at melt temperatures of 210 °C to 250 °C and mould temperatures of 15 °C to 40 °C; parts are limited to continuous service temperatures below 90 °C under ISO 75-2 method A, and warpage is controlled by cooling channel uniformity rather than by formulation changes.
PP H250 GP is used as a carrier resin in polyolefin masterbatches because its 25 g/10 min melt flow rate permits high pigment and additive loadings while maintaining adequate let-down into injection moulding or extrusion base resins. In a co-rotating twin-screw extruder or a high-shear internal mixer, the carrier is premixed with pigment, processing aid, and wax dispersant before melt compounding. For organic pigments, typical loadings are 40 wt% to 60 wt%, while for inorganic pigments such as titanium dioxide or carbon black, loadings can reach 60 wt% to 75 wt%. The critical dispersion threshold is reached when filter pressure rise exceeds 0.5 MPa/h on a 14 μm screen pack after 30 min of continuous extrusion; at that point, agglomerates larger than 5 μm are likely to survive let-down and produce visible specks in thin-wall parts. Processing temperatures for masterbatch production are maintained between 170 °C and 210 °C to protect heat-sensitive organic pigments, although the homopolymer itself can tolerate higher temperatures. The carrier resin must satisfy REACH registration and, for food-contact masterbatches, the finished article must comply with EU Regulation 10/2011 and FDA 21 CFR 177.1520. In let-down, a dilution ratio of 2% to 5% is common for single-pigment concentrates, but carrier-induced changes in the base resin melt flow should be checked by ISO 1133-1; the high-flow carrier can increase the final compound MFR by 0.5 g/10 min to 2 g/10 min depending on dilution ratio. Dispersion quality is assessed by film gauge test under EN 13900-5 or by pressure-rise test in the production extruder; particle count is reported as the number of undispersed particles per unit area according to the masterbatch specification. The main incompatibility is with amine-based hindered amine light stabilizers in certain packaging applications where reaction with pigment surface treatments may cause colour shift; screening under ISO 4892-2 accelerated weathering is required before final selection.
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| Property | Test method | Unit | Characteristic range for MFR 25 homopolymer PP |
|---|---|---|---|
| Melt flow rate | ISO 1133-1:2022 | g/10 min | 25 nominal |
| Density | ISO 1183-1 | g/cm³ | 0.90–0.91 |
| Tensile stress at yield | ISO 527-2 | MPa | 33–37 |
| Tensile elongation at yield | ISO 527-2 | % | 10–12 |
| Tensile modulus | ISO 527-2 | MPa | 1400–1800 |
| Flexural modulus | ISO 178 | MPa | 1500–1800 |
| Notched Charpy impact at 23 °C | ISO 179-1/1eA | kJ/m² | 1.5–2.5 |
| Heat deflection temperature at 0.45 MPa | ISO 75-2/B | °C | 90–100 |
| Property | H250 GP homopolymer class | Random copolymer class | Impact copolymer class |
|---|---|---|---|
| Flexural modulus | 1500–1800 MPa | 900–1200 MPa | 800–1200 MPa |
| Notched Charpy at 23 °C | 1.5–2.5 kJ/m² | 4–8 kJ/m² | 10–25 kJ/m² |
| Heat deflection temperature at 0.45 MPa | 90–100 °C | 75–90 °C | 70–90 °C |
| Haze on 1 mm plaque | 15–40% | 5–15% | opaque |
| Ductile-to-brittle transition region | near or above 0 °C in notched geometry | below 0 °C depending on ethylene | commonly below −20 °C |
When replacing a block copolymer in a non-impact application, the converter should first measure notched Charpy or instrumented puncture on the actual part geometry. Homopolymer PP can exhibit brittle failure at stress concentrations such as gate vestiges, weld lines, and sharp corners even at 23 °C. The absence of an elastomer phase also reduces tolerance to contamination by incompatible polymers such as polyethylene terephthalate or polyamide. Such contamination can produce delamination and weld-line separation.
