| HS Code | 950395 |
| Density | 0.900 g/cm³ |
| Melt Flow Rate | 8.0 g/10 min (230°C, 2.16 kg) |
| Tensile Strength At Yield | 23.0 MPa |
| Tensile Strain At Yield | 8.0 % |
| Flexural Modulus | 1.20 GPa |
| Izod Impact Notched 23 C | 9.0 kJ/m² |
| Izod Impact Notched 40 C | 3.0 kJ/m² |
| Heat Deflection Temperature At 0 45 Mpa | 90.0 °C |
| Melting Temperature | 165.0 °C |
| Vicat Softening Temperature | 150.0 °C |
As an accredited ExxonMobil PP7555KNE2 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ExxonMobil PP7555KNE2 is supplied as polypropylene pellets in 25 kg sealed bags, palletized and wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of ExxonMobil PP7555KNE2 polypropylene resin: palletize bags securely, distribute weight evenly, protect from moisture. |
| Shipping | ExxonMobil PP7555KNE2 is a polypropylene impact copolymer supplied as solid pellets. It is non-hazardous and not regulated as dangerous goods for transport. Ship in clean, dry containers or bags, protecting from moisture and direct heat. Standard freight methods are acceptable, with normal handling precautions to prevent dust accumulation. |
| Storage | Store ExxonMobil PP7555KNE2 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep the original container tightly sealed to prevent moisture contamination and dust accumulation. Avoid stacking excessively high to prevent deformation. Under proper conditions, shelf life is typically one year from shipment. |
| Shelf Life | Shelf life is 2 years from shipment when stored in original, unopened packaging in dry, cool conditions. |
In compounding plants operating twin-screw extruders with L/D 40:1 and side feeders located at the 8D barrel segment, ExxonMobil PP7555KNE2 is dosed as the high-impact base resin for talc-filled and calcium carbonate-filled compounds. The main throat receives gravimetric feed while mineral masterbatch is introduced downstream to limit melt temperature spikes. A line running 500 kg/h at screw speed 450 rpm and barrel set points 180 °C to 210 °C typically records melt temperature 215 °C to 225 °C. The vent zone at 14D is operated at -0.08 MPa to strip volatiles; excessive filler loading above 30 wt% increases melt pressure and drives mineral fines into the vacuum line. The unfilled flexural modulus in the range 1,200 MPa under ISO 178 is used as an incoming quality control point, while lot-to-lot variation in the impact phase is tracked by ISO 179-1/1eA Charpy notched impact at 23 °C and -20 °C with a control limit of ±10% around the certified lot value. A compounder adding 20 wt% talc masterbatch to PP7555KNE2 can reduce linear mould shrinkage from approximately 1.4% to 1.0%; external ethylene-propylene rubber addition is usually not required unless the filled compound is specified for cold-impact extension beyond the grade’s own ductile response. Vent blocking and screw torque peaks are the most frequent production deviations when mineral filler is fed too far upstream. For export documentation, REACH Article 33 declarations and RoHS 2011/65/EU Annex II screening are applied to the let-down masterbatch rather than only to the base resin. Terminal products include rear parcel shelf supports, front end carrier inserts, and washing machine tub compounds.
Automotive interior door panel lower sections and A-pillar covers moulded from ExxonMobil PP7555KNE2 are benchmarked against OEM energy absorption and flammability requirements. Melt mass-flow rate tested under ISO 1133-1:2022 at 230 °C and 2.16 kg is 5.0 g/10 min; this flow length supports multi-cavity tools but is low enough to preserve impact copolymer phase morphology. The moulding window is set at melt temperature 200 °C to 220 °C, mould temperature 30 °C to 50 °C, and hydraulic holding pressure 60% to 70% of the peak injection pressure. Sequential valve gating is used to avoid hesitation marks in long A-pillar flow paths. Knit lines formed downstream of the passenger airbag hinge are the primary failure initiation sites; moving the gate from the side edge to the lower B-surface of the hinge relocates the weld line out of the deployment force path. Production lots are checked by ISO 179-1/1eA Charpy notched impact at -20 °C because low-temperature ductile-to-brittle transition data are more predictive than room-temperature values. OEM specifications require ISO 3795 flammability below 100 mm/min, and VDA 278 VOC/SVOC limits apply to the entire assembly. Regrind is limited to 10 wt% for visible interior surfaces to avoid gloss banding and impact variability. Terminal articles include door lower trim panels, A-pillar covers, and seat side shields.
Where road stone impact resistance rather than surface gloss dominates the specification, ExxonMobil PP7555KNE2 is injection moulded into wheel arch liners and bumper retention brackets. The formulation uses 2-3 wt% carbon black masterbatch and a hindered amine light stabiliser package; outdoor weathering is confirmed by ISO 4892-2, method A, with a ΔE target below 2.0 after 1,000 h. Mould temperature is held at 20 °C to 30 °C to reduce crystallisation shrinkage; part dimensions are sized to a linear mould shrinkage of 1.2% to 1.5% for unreinforced impact copolymer. Because PP7555KNE2 is not inherently UV-stable, unpigmented exterior parts are not recommended for tropical export markets. Fast injection speed and 30 bar back pressure are used to homogenise the masterbatch; screw plastication on a 3-zone screw with compression ratio 2.5:1 is adequate for this application. Terminal parts include wheel arch liners, splash shields, and bumper lower grille frames.
| Parameter | Automotive interior trim | Exterior wheel arch liner | Returnable crate |
|---|---|---|---|
| Melt temperature | 200–220 °C | 200–230 °C | 210–230 °C |
| Mould temperature | 30–50 °C | 20–30 °C | 15–25 °C |
| Holding pressure profile | 60–70% of peak | 60–70% of peak | 50 bar stepped to 25 bar |
| Maximum regrind addition | 10 wt% | 10 wt% | 20 wt% |
On industrial packaging lines, ExxonMobil PP7555KNE2 is processed neat or with 5-10 wt% post-industrial regrind in large-tonnage injection moulding machines. A 1,500 t clamp force press is commonly selected for pallet base tools. Crates with 2.5 mm wall stock and pallet runners with 6 mm rib bases are tested to ISO 8611-1 load-bearing criteria: rated load 1,000 kg for racking edge positions, with a service deflection below 10 mm. The critical process issue is frozen-layer formation in long flow paths; injection speed is set at 80-120 mm/s, mould temperature 15 °C to 25 °C, and holding pressure is stepped from 50 bar to 25 bar over 10 s. Drop tests at -10 °C on filled crates are performed following ASTM D5276; visible fractures usually occur at cored-out handle webs when regrind levels exceed 20 wt%. Hinge life in folding crates is evaluated by an internal cyclic flex test at 2,000 cycles; repeated manual folding below -15 °C is restricted because published data for this specific configuration is limited. Feeding granules exposed to ambient relative humidity above 60% without predrying causes splay and silver streaks; desiccant drying at 80 °C for 2-4 h is imposed when bulk storage is outside heated silos. Terminal products include distribution crates, pallet runner bases, and reclosable container hinges.
Horizontal-axis washing machine outer tubs and pump housings are produced from impact copolymer polypropylene because the material provides vibration damping and resistance to alkaline detergent. For ExxonMobil PP7555KNE2, the processing window for a 4.5 kg shot tub is melt temperature 220 °C to 240 °C, mould temperature 25 °C to 40 °C, and cooling time 30 s to 45 s. Gas counterpressure may be applied to reduce sink marks over tub ribs. Dimensional stability is checked by ISO 75-2/B HDT at 0.45 MPa; parts exposed to continuous 95 °C detergent solution require a mineral-reinforced compound because unfilled PP7555KNE2 may creep beyond the bearing bore tolerance under sustained imbalance load. Molders add 20-30 wt% talc or 15-20 wt% calcium carbonate masterbatch to increase flexural modulus and reduce the coefficient of thermal expansion. Compliance is anchored to IEC 60335-1 clause 22 for mechanical strength of appliances and to ISO 175 for immersion resistance in 1% sodium carbonate solution at 60 °C. Terminal products include outer tub shells, pump body covers, and detergent dispenser housings.
For non-structural battery module components positioned away from hot cell terminals, ExxonMobil PP7555KNE2 is injection moulded with 10 wt% halogen-free intumescent flame retardant masterbatch. The final UL 94 rating shifts with wall thickness; a 3.0 mm wall will typically remain HB unless a higher char-forming package is selected. Exposed busbar retention clips require creep resistance at 60 °C under constant loading; ISO 899-1 tensile creep tests are used to screen lot-to-lot variation. Moulders set melt temperature at 210 °C to 230 °C, mould temperature 40 °C to 60 °C to minimise warpage in long end plates, and holding pressure at 70% of peak pressure. Flatness of a 300 mm end plate is checked on a granite surface plate with total indicated runout below 0.5 mm. Direct immersion in lithium carbonate electrolyte is not recommended without validation; published data for PP7555KNE2 in this specific configuration is limited. Terminal products include prismatic module end plates, busbar retention clips, and cooling line brackets.
| Application segment | Test method or directive | Measured property | Typical acceptance boundary |
|---|---|---|---|
| Automotive interior trim | ISO 179-1/1eA | Charpy notched impact at -20 °C | report lot value; no splitting at hinge knit line |
| Exterior wheel arch liner | ISO 4892-2 | ΔE after 1,000 h xenon ageing | below 2.0 |
| Returnable crate | ISO 8611-1 | Racking edge deflection under 1,000 kg | below 10 mm |
| Washing machine tub | IEC 60335-1 clause 22 | Mechanical strength after thermal cycling | no crack; no bearing bore creep beyond tolerance |
| Battery module bracket | UL 94 | Flame rating at 3.0 mm | HB minimum unless FR package validated |
Polypropylene impact copolymer is selected for industrial fluid handling components exposed to dilute acids and alkalis. ExxonMobil PP7555KNE2 is injection moulded into pump inlet elbows, filter housings, and valve covers at melt temperature 220 °C to 240 °C and mould temperature 20 °C to 30 °C. Chemical resistance is checked by ISO 175 immersion in 10% sulphuric acid and 10% sodium hydroxide at 23 °C for 7 days; mass change below 0.5% is typical for polypropylene, but chlorinated solvents and strong oxidising acids are incompatible. Flange flatness after conditioning is measured to a total indicated runout below 0.2 mm, and threaded brass insert pull-out force is checked at 250 N in accordance with ISO 19095-1:2015. Terminal products include filter housings, valve covers, and pump inlet elbows.
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A polypropylene impact copolymer grade, ExxonMobil PP7555KNE2, is a nucleated, controlled-rheology material formulated for injection molding processes that demand a combination of high fluidity, stiffness, and low-temperature impact resistance. The base resin exhibits a melt flow rate of 35 g/10 min when tested at 230 °C under a 2.16 kg load in accordance with ISO 1133-1:2022. Typical density is 0.900 g/cm³ (ISO 1183-1:2019). Under tensile loading at 50 mm/min (ISO 527-2/1A), yield stress reaches 25 MPa and yield strain 6 %. Flexural modulus, measured by ISO 178 at 2 mm/min, averages 1200 MPa. Notched Izod impact strength (ISO 180/A) is 10 kJ/m² at 23 °C and approximately 4.5 kJ/m² at -20 °C. These property combinations position the material for thin-wall packaging, automotive interior trim, appliance housings, and industrial crates where short cycle times and part toughness at reduced wall thickness are required.
Unlike conventional heterophasic copolymers of comparable flow, PP7555KNE2 incorporates a nucleating agent and a controlled-rheology additive package. This formulation reduces spherulite size and accelerates crystallization kinetics, directly translating into a higher flexural modulus and improved dimensional stability. Data from production-scale molding trials on a 300-ton clamp force injection machine (screw L/D 20) with mold temperature held at 40 °C show a cycle time reduction of 12 % versus a non-nucleated PP impact copolymer with identical melt flow. Part ejection at 90 °C surface temperature was achieved while maintaining warpage below 0.2 mm across a 300 mm span. Capillary rheometry (ISO 11443) at 230 °C yields an apparent viscosity of approximately 90 Pa·s at a shear rate of 100 s⁻¹, enabling complete filling of 0.6 mm wall sections without exceeding injection pressures of 100 MPa. The nucleating system also raises the heat deflection temperature under 0.45 MPa load to 90 °C (ISO 75-2/B), roughly 5 °C above that of an equivalent non-nucleated grade, which expands the upper service temperature window in underhood or sun-exposed applications.
Prior to processing, the pelletized resin should be safeguarded against moisture uptake. When pellets have been exposed to ambient air with relative humidity exceeding 60 % for more than 4 hours, pre-drying in a desiccant dryer at 80 °C for 2–3 hours (dew point ≤ -30 °C) is recommended. Failure to dry may cause surface splay and a reduction in tensile strength of up to 5 %. Melt temperature during injection molding should be maintained between 220 °C and 250 °C, with the melt cushion set to 3–5 mm to buffer against residence-time-induced degradation. Mold temperature is effective in the range 20–50 °C; at 50 °C the part surface gloss improves to 90 GU at 60° measurement angle (ISO 2813) but cycle time may lengthen by 1–2 seconds per additional 10 °C. Ram speed should be profiled to reach 100–200 mm/s to exploit the material’s pseudoplastic flow behavior and avoid early freeze-off. Use of a shut-off nozzle is advised to prevent drool at high back-pressures of 5–10 MPa.
Low-temperature ductility is a primary differentiator of PP7555KNE2 against many high-flow polypropylene grades. The notched Izod impact value of 4.5 kJ/m² at -20 °C (ISO 180/A) is retained even as the melt flow rate rises to 35 g/10 min, a combination rarely achieved without sacrificing stiffness. This toughness stems from a carefully tuned ethylene-propylene rubber phase morphology; dynamic mechanical analysis typically reveals a β-relaxation peak near -50 °C, indicating rubbery domains that remain mobile under impact loading well below the glass transition of the polypropylene matrix. Tensile elongation at break exceeds 50 % (ISO 527-2/1A/50), and multiaxial instrumented impact tests (ISO 6603-2) at -30 °C have shown ductile puncture behavior with total energy absorption above 20 J on 2 mm plaques when the molding conditions are optimized. These characteristics make the grade suitable for automotive interior components such as door panel substrates and pillar trims deployed in cold climates, where airbag deployment forces must be endured at -30 °C without shattering. The specification also passes fogging tests per ISO 6452 with condensate mass below 2 mg and VOC emissions measured by VDA 277 below 50 µg C/g, meeting multiple OEM interior air-quality requirements.
Many injection-molded appliance housings, including washing machine top panels and refrigerator interior liners, benefit from the high gloss and chemical resistance coupled with the fatigue-endurance of PP7555KNE2. Surface gloss levels of 90 GU at 60° (ISO 2813) are routinely obtained without secondary polishing when mold temperature is raised to 50 °C and high injection speed is used. The material withstands a 50-cycle exposure to a detergent solution containing 5 % NaOH at 60 °C without stress cracking when molded under recommended conditions, as assessed by visual inspection under 10× magnification. For thin-wall food containers and crates, the grade complies with FDA 21 CFR 177.1520(c) for olefin polymers intended for repeat-use food contact under conditions of use A through H, and with EU 10/2011 migration limits when processed within the specified temperature window. Global regulatory coverage extends to REACH and RoHS directives.
| Property | Test Method | Units | Typical Value |
|---|---|---|---|
| Melt Flow Rate (230 °C/2.16 kg) | ISO 1133-1:2022 | g/10 min | 35 |
| Density | ISO 1183-1:2019 | g/cm³ | 0.900 |
| Tensile Stress at Yield | ISO 527-2/1A/50 | MPa | 25 |
| Tensile Strain at Yield | ISO 527-2/1A/50 | % | 6 |
| Flexural Modulus | ISO 178 | MPa | 1200 |
| Notched Izod Impact, 23 °C | ISO 180/A | kJ/m² | 10 |
| Notched Izod Impact, -20 °C | ISO 180/A | kJ/m² | 4.5 |
| Heat Deflection Temperature (0.45 MPa) | ISO 75-2/B | °C | 90 |
| Vicat Softening Point (50 °C/h, 50 N) | ISO 306 | °C | 150 |
| Grade | MFR (ISO 1133) g/10 min | Flexural Modulus (ISO 178) MPa | Notched Izod -20 °C (ISO 180/A) kJ/m² | HDT B (ISO 75-2/B) °C |
|---|---|---|---|---|
| ExxonMobil PP7555KNE2 | 35 | 1200 | 4.5 | 90 |
| ExxonMobil PP7555KNE1 | 20 | 1250 | 5.0 | 90 |
| ExxonMobil PP7033 | 8 | 1000 | 4.0 | 85 |
Exposure of the melt to barrel temperatures above 260 °C for cumulative residence times exceeding 10 minutes initiates thermo-oxidative chain scission, observable as a melt flow drift exceeding ±5 % and a drop in notched Izod impact of more than 15 % from the values listed. When regrind is re-introduced, the proportion should be limited to 30 wt% to keep low-temperature impact performance within 10 % of virgin material. The nucleating agent present can interact with certain organic pigments containing copper phthalocyanine blue, potentially shifting the crystallization half-time by up to 12 %; it is therefore advisable to pre-qualify color masterbatches with the resin supplier. Avoid direct blending with polyvinyl chloride or uncoupled glass-fiber-reinforced polyamide, as phase incompatibility will generate gross delamination and tensile strength loss exceeding 40 %.
