| HS Code | 942862 |
| Density | 0.905 g/cm³ |
| Melt Flow Rate | 4.0 - 12.0 g/10 min (230°C, 2.16 kg) |
| Tensile Strength At Yield | 33 - 38 MPa |
| Elongation At Yield | 8 - 12 % |
| Flexural Modulus | 1400 - 1800 MPa |
| Notched Izod Impact | 3.0 - 5.0 kJ/m² at 23°C |
| Heat Deflection Temperature | 90 - 110 °C at 0.45 MPa |
| Vicat Softening Temperature | 150 - 160 °C |
| Melting Temperature | 160 - 165 °C |
| Rockwell Hardness | R95 - R110 |
| Water Absorption | 0.01 - 0.03 % over 24 hours |
| Dielectric Strength | 20 - 30 kV/mm |
As an accredited SABIC PP Homopolymer / PPcompound factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SABIC PP Homopolymer/PPcompound supplied as pellets in 25 kg bags or 1,000 kg big bags, palletized and shrink-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SABIC PP Homopolymer/PPcompound: palletized, secured, dry, ventilated packaging to prevent contamination and damage. |
| Shipping | SABIC PP Homopolymer/PPcompound is supplied as free-flowing pellets in 25 kg bags, big bags, or bulk containers. Ship in dry, clean, covered transport to prevent moisture contamination. Avoid excessive heat and direct sunlight; no dangerous goods classification applies under normal shipping conditions. |
| Storage | Store SABIC PP Homopolymer/PPcompound in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep containers sealed to prevent moisture contamination and dust accumulation. Protect packaging from physical damage. No special hazardous storage requirements apply, but avoid storing near strong oxidizers. Maintain moderate ambient temperatures. |
| Shelf Life | Shelf life is indefinite when stored in a cool, dry place, protected from sunlight, heat, and moisture. |
Biaxially oriented polypropylene film based on SABIC PP homopolymer is produced from base resin with a melt mass-flow rate of 2.0–3.5 g/10 min under ISO 1133-1:2022, a density of 0.900–0.910 g/cm³ under ISO 1183-1:2019, and an isotacticity content above 95% in the homopolymer backbone. In European food-contact use, the film complies with EU Regulation (EC) No 10/2011, Annex I Table 1, with overall migration below 10 mg/dm² per Article 12; in United States food packaging, the homopolymer falls under FDA 21 CFR 177.1520(c), and the final structure must meet ASTM D882-18 tensile test values after orientation. The core-layer formulation is deliberate: the homopolymer base constitutes 96–99.5 wt%, while a slip/antiblock masterbatch containing erucamide and silica is added at 0.5–2.0 wt%. In heat-sealable coextruded structures, a terpolymer skin layer may represent 3–8 wt% of total thickness but does not enter the homopolymer core formulation. Hydrocarbon tackifier is not used in the core layer unless the line is deliberately targeted at overwrap or adhesive-tape base films, where a 1.5–3.5 wt% addition raises seal affinity at the expense of increased blocking tendency.
Sequential tenter-frame orientation dominates production-scale lines. Melt is discharged through a coat-hanger die onto a quench roll held at 25–45 °C; water-bath or chill-roll quenching is selected according to line speed and film width. The cast sheet is preheated to 125–145 °C and drawn in machine direction at 4.5–5.5:1, followed by transverse stretching at 155–170 °C with a transverse draw ratio of 8–10:1. Edge neck-in is controlled by rail geometry and tenter clip spacing; on an 8 m wide main line, neck-in of 150–250 mm per edge is routinely observed and compensated by die width and clip settings. Corona treatment in the range 38–42 mN/m is applied to one or both surfaces for printability. The resultant film typically has thickness 15–40 µm, haze below 2.0% for plain grades, and machine-direction tensile modulus above 2,000 MPa when tested according to ISO 527-3. If quench roll temperature exceeds 45 °C, spherulite growth increases haze and reduces drawability; below 25 °C, the cast sheet may develop quench stresses that propagate as web breaks during MD stretching. High-slip formulations should not be corona-treated above 45 mN/m, because excessive surface oxidation causes erucamide to migrate to the treated side and creates print delamination. Finished article categories include snack food films, confectionery mono-wraps, pressure-sensitive tape base films, cigarette overwrap, bubble wrap lamination, and printed labels.
In high-cavitation thin-wall injection moulding for dairy tubs and closures, SABIC PP homopolymer grades are selected with melt mass-flow rates between 35 g/10 min and 70 g/10 min under ISO 1133-1:2022, measured at 230 °C and 2.16 kg. The homopolymer is formulated to 97.5–99.4 wt%; a nucleating agent based on sorbitol or phosphate ester forms 0.10–0.25 wt%, calcium stearate acid scavenger 0.05–0.10 wt%, slip/antiblock masterbatch 0.05–0.20 wt%, and antistatic concentrate 0.10–0.30 wt%. White or pigmented masterbatch is added at 0.5–2.0 wt% depending on colour strength required for margarine tubs, yogurt cups, and deli lids. Food-contact compliance must be demonstrated against FDA 21 CFR 177.1520(c) and EU Regulation (EC) No 10/2011, Article 12, with overall migration below 10 mg/dm², and with specific migration limits for additives from Annex I Table 1. In converter practice, the hot runner must be balanced to within ±2% of shot-to-shot fill weight; otherwise part weight variation on a 128-cavity closure tool exceeds 0.08 g and causes cap fit inconsistencies.
Production-scale accumulator-assisted hydraulic machines with clamp force from 1,500 kN to 4,000 kN are run at melt temperatures of 220–250 °C, not exceeding 270 °C to limit oxidative degradation. The mould coolant temperature is held at 12–25 °C, injection velocity at 300–600 mm/s, and holding pressure at 40–70 MPa; total cycle times for 0.35–0.60 mm wall thickness are 4.0–8.0 s depending on part geometry. Thin-wall containers with flow length-to-wall-thickness ratios exceeding 200:1 require gates positioned at the centre of the base to avoid differential shrink and rim deformation. After demoulding, the moulded article set spans dairy tubs, round and rectangular deli containers, tamper-evident closures, thin-wall vials, and disposable cutlery sleeves. The main processing boundary is melt fracture at high injection speeds when the nucleated resin has an MFR above 70 g/10 min; that condition increases side-wall brittleness and reduces drop resistance in cold storage.
Slit-film raffia tape extrusion from SABIC PP homopolymer operates behind a water-bath quench at 28–35 °C using a single-screw extruder with an L/D 30:1–33:1 barrier screw, a die gap of 0.5–0.9 mm, and a water-bath distance of 15–30 mm from the die lip. The base resin is a homopolymer with MFR 2.0–5.0 g/10 min under ISO 1133-1:2022; the formulation comprises PP homopolymer at 88–97 wt%, calcium carbonate masterbatch at 3–8 wt%, HALS-based UV stabiliser masterbatch at 0.2–1.0 wt%, and titanium dioxide white masterbatch at 1–4 wt% for opacity and UV protection in outdoor cement and fertilizer sacks. Compliance for food-contact woven sacks is based on FDA 21 CFR 177.1520(c) and EU Regulation (EC) No 10/2011; for bulk bags, ISO 21898:2019 governs design, cyclic testing, and safe working loads for flexible intermediate bulk containers, while tensile seam strength is evaluated by ISO 13934-1.
After extrusion, the quenched cast film is slit into tapes, heated in a hot-air oven at 135–165 °C, and stretched between godet sets at a ratio of 5:1–9:1 before annealing on heated rollers. Narrow tape widths of 2.5–4.5 mm are woven on circular looms into fabric at 55–85 picks per 100 mm. In production-scale lines, calcium carbonate additions above 8 wt% reduce fibre drawability and cause fibrillation, so masterbatch loading must be reduced if the tape breaks at the slitting point or if the stretch line shows white stress fibrillation. UV-stabilised formulations should not be stored in contact with acid-scavenger concentrates containing high levels of zinc stearate at ambient warehouse temperatures above 40 °C, since the interaction can cause colour shift and reduce long-term thermal aging stability. Finished product types include woven sacks for cement, fertiliser, and agricultural produce, FIBCs, tarpaulins, and carpet-backing slit film.
Spunbond nonwoven lines running SABIC PP homopolymer grades require a melt mass-flow rate of 25–60 g/10 min under ISO 1133-1:2022; controlled-rheology grades produced by peroxide visbreaking are commonly selected because the molecular weight distribution influences filament draw resonance. Formulation is dominated by the homopolymer base at 94–99 wt%, with peroxide masterbatch for inline viscosity adjustment at 0.05–0.20 wt% when standard grades require controlled rheology, colour masterbatch at 0.5–2.5 wt%, and melt additive packages for wettability or antistatic behaviour at 0.3–1.0 wt%. For medical nonwoven applications, the fabric must comply with ISO 10993-5:2009 for cytotoxicity and ISO 9073-3:2023 for tensile strength, while hygiene topsheet materials are evaluated for migration under EU Regulation (EC) No 10/2011 and FDA 21 CFR 177.1520(c) where direct skin contact is intended. Copper-based pigmentation should not be combined with peroxide masterbatch because catalytic degradation can cause MFR drift during dwell time in the spin pack.
On production-scale spunbond equipment, melt is discharged through spinnerets at 200–235 °C and pressurised to 6–10 MPa before quenching. Quench air velocity is set between 0.3 m/s and 0.8 m/s; below this range, filament cooling is uneven and the web develops coarse bundles, while above it, filament breakage increases due to aerodynamic turbulence. Filament draw speeds between 3,000 m/min and 6,000 m/min are obtained by slot attenuation, and the resulting web is calendered at 140–155 °C with nip pressure 40–80 N/mm. A critical process conflict occurs when calender temperature exceeds 158 °C: the web embosses into a translucent film-like structure with reduced air permeability and unacceptable pinholes; below 138 °C, bond points remain weak and the fabric delaminates under the abrasion test of ISO 9073-12. Hygroscopic melt additive masterbatches should be pre-dried at 80 °C for 2 h when warehouse relative humidity exceeds 60%, otherwise hydrolysis of the carrier resin may produce surface defects on the filament. Converted articles produced from this fabric include hygiene topsheets, medical gowns, surgical drapes, face mask layers, furniture wrap, and agricultural row covers.
On twin-screw compounding lines producing automotive interior carrier substrates, a SABIC PPcompound is formulated from a PP homopolymer matrix at 60–75 wt%, talc at 10–30 wt%, ethylene-octene or EPDM elastomer at 5–20 wt%, heat stabiliser package at 0.2–0.6 wt%, and scratch-resistant amide or siloxane additive at 1–3 wt%; carbon black masterbatch is added at 0.5–2.0 wt% for UV stability and hide. Compliance is anchored to ISO 3795:1989 or FMVSS 302 for interior flammability with burn rate below 100 mm/min, VDA 277 for total volatile organic compounds, and REACH Regulation (EC) No 1907/2006 with SVHC content below 0.1 wt% per article. Dimensional stability testing follows ISO 527-2 for tensile properties, ISO 178 for flexural modulus, and ISO 179-1 or ISO 180 for notched impact. Published data for the exact SABIC PPcompound formulation is limited, and the table below is drawn from public ISO test data for analogous talc-filled PP homopolymer systems rather than a guaranteed grade specification.
Compounding uses L/D 40:1–48:1 co-rotating twin-screw extruders, screw speeds of 400–700 rpm, barrel temperatures of 190–230 °C, and side-feeding of talc at the downstream feed throat to limit attrition and preserve aspect ratio. Vacuum degassing at 40–80 mbar removes volatiles and reduces fogging. The compounded pellets are injection moulded at melt temperatures of 210–240 °C, mould temperatures of 30–60 °C, and holding pressures of 60–90 MPa; large dashboard carriers require clamp forces from 6,000 kN to 20,000 kN. A persistent production defect in this class is differential shrinkage between ribbed sections and nominal walls: rib-to-wall thickness ratio must be kept below 0.6:1, and gate freeze time must be confirmed by short-shot study, because premature gate freeze at the hot-drop tip results in sink marks above 0.05 mm depth that become visible after surface graining. If silane-treated talc masterbatches or hygroscopic color masterbatches are stored at relative humidity above 60%, pre-drying at 80 °C for 2 h is required to prevent hydrolysis of coupling agents and surface splay. Amine-based secondary heat stabilisers should not be used in the same formulation with halogenated flame-retardant packages where low-smoke interior specifications apply, because this combination can lower thermo-oxidative stability and increase colour drift after 1,000 h heat aging at 120 °C according to ISO 4577:1983. The finished product census includes dashboard carriers, door panel substrates, centre console substrates, and HVAC housings.
| Formulation descriptor | Tensile modulus ISO 527-2 | Notched Charpy impact ISO 179-1 at 23 °C | MFR ISO 1133-1 at 230 °C/2.16 kg |
|---|---|---|---|
| PP-TD10 | 1,800–2,200 MPa | 5–8 kJ/m² | 15–25 g/10 min |
| PP-TD20 | 2,300–2,700 MPa | 4–6 kJ/m² | 12–20 g/10 min |
| PP/EPDM-TD20 | 1,800–2,200 MPa | 20–35 kJ/m² | 10–18 g/10 min |
Returnable packaging board is extruded from SABIC PP homopolymer on twin-wall or triple-wall sheet lines with a barrier screw of L/D 33:1, a die gap of 0.8–2.0 mm, and vacuum calibration blocks set to maintain flute height from 2 mm to 5 mm. The homopolymer base usually occupies 92–98 wt% of the formulation; colour masterbatch is added at 2–5 wt%, UV stabiliser masterbatch at 0.3–1.0 wt%, and, where fire-retardant performance is required, a halogen-free intumescent masterbatch at 5–10 wt% is used to reach UL 94 V-2 at 3 mm thickness. Compliance is assessed under REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE below the stated maximum concentration values. Outdoor signage sheet is qualified by ISO 4892-2 accelerated weathering for colour change and ISO 178 for flexural modulus.
Process temperatures at the flat die are held at 210–240 °C, with vacuum calibration water at 25–35 °C and haul-off speed controlled to maintain 0.6–1.2 m/min for heavy board. Low melt strength homopolymer grades will sag at the die if the melt temperature exceeds 245 °C, causing flute collapse and gauge variation. When adding intumescent flame-retardant masterbatch, the line must be purged with unfilled homopolymer every 4 h to prevent char accumulation at the die lips and screen pack pressure rise above 12 MPa. Finished product categories include returnable packaging boxes, automotive dunnage, signboard, exhibition stands, and layer pads.
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SABIC PP Homopolymer is a family of isotactic polypropylene reactor grades supplied in pellet form for injection moulding, sheet extrusion, thermoforming, tape, and fibre spinning. The homopolymer backbone contains only propylene repeat units, and its regular stereostructure crystallises primarily into α-monoclinic lamellae on cooling. That structural regularity produces a room-temperature tensile modulus typically between 1,250 MPa and 1,600 MPa when tested according to ISO 527-2, and a heat deflection temperature under 0.45 MPa in the range 85 °C to 105 °C per ISO 75-1/-2. SABIC PPcompound refers to the same homopolymer or copolymer reactor base into which stabiliser packages, nucleating agents, talc, glass fibre, or ethylene-octene elastomer phases are dispersed in a co-rotating twin-screw extruder. The compounded products are polypropylene-matrix composites or impact-modified polypropylenes whose continuous phase remains isotactic polypropylene. Available homopolymer grades include SABIC PP 500P, 510A, 520L, 570P, and 575P; the numerical suffix and letter code correspond to a nominal melt mass-flow rate and conversion route. The principal specification input is the melt mass-flow rate measured at 230 °C under 2.16 kg load using ISO 1133-1:2022, because it determines flow length, packing response, and the minimum wall thickness achievable in injection moulding. For PPcompound, MFR is supplemented by filler content, ash residue per ISO 3451-1, tensile modulus per ISO 527-2, and notched Izod impact resistance per ISO 180/A.
The five homopolymer grades map onto a nominal MFR progression from 3.0 g/10 min to 25 g/10 min at 230 °C and 2.16 kg. These are nominal values reported in producer technical literature and do not replace certificate-of-analysis data for an individual batch. In production-scale injection moulding, the 575P grade is selected for multicavity hot-runner tools with flow-length-to-wall-thickness ratios above 200:1; the lower-MFR 500P is reserved for extruded sheet where melt strength rather than flow length controls gauge uniformity.
| Grade series | Nominal melt mass-flow rate at 230 °C/2.16 kg per ISO 1133-1:2022 | Typical conversion route |
|---|---|---|
| SABIC PP 500P | 3.0 g/10 min | Extrusion, thermoforming, sheet |
| SABIC PP 510A | 7.0 g/10 min | General injection moulding |
| SABIC PP 520L | 10 g/10 min | Injection moulding, thin-wall containers, caps |
| SABIC PP 570P | 18 g/10 min | High-flow injection moulding, multicavity tooling |
| SABIC PP 575P | 25 g/10 min | Thin-wall and complex-flow-length parts |
The melt temperature window across the series is 220 °C to 260 °C. Sustained melt temperatures above 270 °C accelerate chain scission, increase volatile formation, and shift yellowness index measured per ASTM D1925 beyond typical acceptance limits. Barrel zone settings are profiled from 200 °C at the feed throat to 240–250 °C at the nozzle, with a flat-to-reverse screw profile if regrind is present. Screw L/D ratios of 20:1 to 24:1 and compression ratios of 2.5:1 to 3.5:1 are sufficient for granular feedstock; PPcompound containing 20 wt% or more talc benefits from a single-flight feed section and two-row mixing elements in the metering zone to disperse agglomerates without excessive viscous heating.
Quasi-static tensile and flexural data for unfilled SABIC PP homopolymer show a tensile stress at yield of 32 MPa to 37 MPa and a flexural modulus of 1,200 MPa to 1,500 MPa when tested at 23 °C per ISO 178. The corresponding tensile modulus per ISO 527-2 is between 1,250 MPa and 1,600 MPa. Notched Izod impact resistance measured per ISO 180/A at 23 °C is typically between 2.0 kJ/m² and 4.0 kJ/m², and the material exhibits a ductile-to-brittle transition below 0 °C to 10 °C depending on specimen thickness and injection speed. For parts requiring low-temperature impact, PPcompound grades based on an impact-copolymer base or elastomer modification are specified rather than homopolymer. The thermo-mechanical envelope of unfilled homopolymer includes a Vicat softening temperature of 150 °C to 155 °C per ISO 306/B50 and a heat deflection temperature under 0.45 MPa of 85 °C to 105 °C per ISO 75-1/-2. Elevated-temperature creep is loading-rate dependent; continuous load-bearing applications below 0.5 MPa effective tensile stress are normally outside long-term deformation limits above 60 °C unless validated by ISO 899-1 tensile creep testing. The homopolymer’s crystalline melting point, determined by differential scanning calorimetry per ISO 11357-3, is 160 °C to 167 °C, which is lower than polyamide 66 and PET but higher than LDPE and EVA.
PPcompound grades differ from reactor random copolymers and impact copolymers through post-reactor twin-screw compounding. Talc-filled SABIC PPcompound with 20 wt% talc raises flexural modulus to 2,200 MPa to 3,200 MPa and reduces mould shrinkage to 0.7% to 1.2% per ISO 294-4. Glass-fibre-reinforced variants at 20 wt% to 30 wt% fibre content reach tensile modulus values above 5,000 MPa but produce anisotropic shrinkage and require wear-resistant screws and barrels. Impact-modified PPcompound contains a dispersed ethylene-propylene or ethylene-octene elastomer phase; notched Izod values at −20 °C can exceed 4.0 kJ/m², whereas unfilled homopolymer is frequently below 2.5 kJ/m² under the same condition. The compromise is a reduction in tensile modulus and heat deflection temperature relative to homopolymer.
| Property | Unfilled homopolymer | Random copolymer | Impact copolymer | 20 wt% talc-filled PPcompound |
|---|---|---|---|---|
| Tensile modulus per ISO 527-2 | 1,250–1,600 MPa | 800–1,100 MPa | 900–1,200 MPa | 2,200–3,200 MPa |
| Notched Izod at 23 °C per ISO 180/A | 2.0–4.0 kJ/m² | 6–12 kJ/m² | 10–30 kJ/m² | 3.0–6.0 kJ/m² |
| HDT at 0.45 MPa per ISO 75-1/-2 | 85–105 °C | 70–90 °C | 75–95 °C | 110–130 °C |
| Mould shrinkage per ISO 294-4 | 1.2–2.0 % | 1.0–1.8 % | 1.2–2.0 % | 0.7–1.2 % |
Reactor random copolymers, having a small fractional comonomer incorporation, reduce crystallinity and raise transparency. The haze of a 1 mm injection-moulded plaque tested per ASTM D1003 is typically below 10%, while homopolymer plaques exceed 40%. Impact copolymers have a heterophasic structure in the reactor and provide higher impact resistance without an external compounding step, but they lack the tight control of filler dispersion available in PPcompound. Compared with ABS, SABIC PPcompound has lower density per ISO 1183-1, between 0.90 g/cm³ and 1.05 g/cm³, versus 1.04 g/cm³ to 1.06 g/cm³ for ABS, and better resistance to aqueous acids, but lower notched Izod and poorer surface adhesion for painting or electroplating. ABS is preferred where electroplated finishes or high falling-dart impact at −30 °C are required; SABIC PPcompound is specified where weight reduction, dishwasher chemical exposure, and cost per cubic metre dominate. In automotive interior substrates, talc-filled PPcompound with 20 wt% talc replaces ABS in instrument panel substrates by providing a flexural modulus above 2,300 MPa at 23 °C per ISO 178 and a coefficient of linear thermal expansion below 40 × 10⁻⁶ /°C in the flow direction, though published data for this specific configuration is limited.
Injection moulding machine set-up for unfilled homopolymer does not require pre-drying when pellets are stored at ambient conditions below 60% relative humidity in vapour-sealed bags. If exposed to moisture, or when processing talc-filled PPcompound, a desiccant drier set at 80 °C for 2 h to 4 h with a dew point of −30 °C or lower removes surface moisture and prevents splay. Clamp force requirement is calculated from projected area; typical hydraulic or toggle machines in the 1,200 kN to 4,000 kN range are used for multicavity caps and closures. Mould temperatures of 20 °C to 50 °C are standard, with lower temperatures increasing gloss but reducing crystallinity; higher mould temperatures in the 60 °C to 80 °C range improve moulding of longer glass-fibre-reinforced PPcompound. Hold pressure profiles are established by gate seal studies: the gate seal time for a 1.5 mm wall is shorter than the packing time for a 3.0 mm wall, and premature transfer to hold pressure produces sink marks or vacuum voids. Back pressure should be held between 0.5 MPa and 1.5 MPa hydraulic for unfilled grades; for talc-filled compounds, back pressure below 1.0 MPa is preferred to reduce excessive melt temperature rise. Screws with check-ring tip and non-return valve are required to maintain shot-to-shot weight variation within ±0.2 wt%; production-scale processing on older plunger machines is not recommended for PPcompound containing glass fibre because fibre breakage causes loss of tensile strength.
Thin-wall containers, caps, and closures with wall stocks below 1.2 mm are commonly converted from random copolymer to SABIC PP 570P or 575P when transparency is not a requirement. The higher crystallinity of homopolymer produces a tensile modulus 25% to 40% above a random copolymer of equivalent MFR, permitting part weight reduction while maintaining top-load strength against ASTM D2659 compression. The trade-off is low-temperature impact and opacity. In dairy cups or clear salad containers, random copolymer remains compulsory because product visibility and drop impact at 2 °C to 5 °C dominate. For opaque margarine tubs or takeaway containers, 575P with an MFR of 25 g/10 min fills a 0.8 mm wall with reduced injection pressure compared with 520L at 10 g/10 min; processing trials show melt pressure at the nozzle is lower by roughly 5% to 15%, but published data for this specific configuration is limited. Injection speeds of 80 mm/s to 150 mm/s are used; slower speeds below 60 mm/s produce flow marks and cold-flow fronts in thin-wall parts. Mould venting is more critical with high-MFR PP because flash may occur at lower clamp forces; vents of 0.02 mm to 0.03 mm depth prevent burn marks without excessive flash.
Weld-line strength in talc-filled PPcompound reduces to 60% to 80% of the unfilled matrix tensile strength because plate-like talc particles orient parallel to the weld plane; this is quantified on single-gated versus dual-gated plaques per ISO 527-2. For glass-fibre PPcompound, weld-line strength is reduced more severely, and part design must position gates away from load-bearing regions. Unfilled homopolymer retains higher weld-line strength, up to 85% to 95% of the base tensile strength. In multi-gated closures, this distinction controls gate placement and packing pressure profile.
SABIC PP homopolymer is resistant to aqueous acids, alkaline solutions, and polar organic solvents at temperatures up to 60 °C. Prolonged contact with aromatic hydrocarbons, chlorinated solvents, or strong oxidising acids produces swelling or oxidative attack; environmental stress cracking in detergents is evaluated with Igepal CO-630 immersion per ASTM D1693 if required. Food-contact grades comply with 21 CFR 177.1520 olefin polymers, EU Regulation (EU) 10/2011 as amended, and REACH restrictions; specific migration limits are product-specific and depend on additive packages. RoHS compliance is documented for electrical appliance applications. Medical applications require ISO 10993-1 assessment and grade-specific suitability; not every SABIC PP Homopolymer or PPcompound grade is certified for long-term implantable use.
Unstabilised PP homopolymer degrades rapidly by β-scission above 280 °C; processing at 300 °C causes visible yellowing and a drop in molecular weight measurable by an upward shift in ISO 1133-1 MFR. Production extrusion and injection moulding should keep melt residence time below 5 min when barrel temperatures exceed 250 °C. Oxidation induction time determined by ISO 11357-6 is typically below 10 min at 200 °C for general-purpose grades, but this is highly formulation-dependent. Long-term heat aging per ISO 4577 for moulded specimens in forced-air ovens at 135 °C is used to qualify under-hood and appliance components; failure criteria are defined by retained tensile strength and colour change. PPcompound containing talc or glass fibre provides higher heat deflection but not necessarily superior long-term heat aging because the polymer matrix is the weak phase. Moisture absorption of unfilled PP is below 0.1% at 23 °C and 50% relative humidity per ISO 62; the practical consequence is negligible mechanical property change, but surface splay defects in melt processing can still be caused by condensed water. For ocean-freight pallets stored in high humidity, drying at 80 °C for 3 h before extrusion or injection moulding is a specified preventive measure.
Lot-to-lot variation in MFR for SABIC PP homopolymer is controlled within statistically derived limits; injection moulders may observe a shift in as-received pellets from 10 g/10 min nominal to 9 g/10 min or 11 g/10 min depending on campaign. In multicavity closures, this variation changes shot weight and part dimensions; processors compensate with cushion adjustment and hot-runner tip temperature. The certificate of analysis accompanying each batch lists MFR per ISO 1133-1:2022, ash content per ISO 3451-1 for filled grades, and tensile modulus per ISO 527-2. For PPcompound, dispersion quality is checked by a pressure-rise test on a screen pack in a single-screw extruder; a pressure increase above 0.5 MPa/min at constant throughput indicates unacceptable agglomeration or filler segregation. The product is not recommended for outdoor unpigmented use without UV stabilisation because unstabilised PP undergoes photo-oxidative chain scission; carbon black at 2 wt% or hindered amine light stabiliser systems are added where weathering resistance is required. Long-term UV exposure is rated by SAE J2527 or ISO 4892-2; colour shift and gloss retention depend on additive package.
