| HS Code | 572673 |
| Density | 0.905 g/cm³ |
| Melt Flow Rate | 2.5 g/10 min (230°C/2.16 kg) |
| Tensile Yield Strength | 35 MPa |
| Elongation At Break | 150% |
| Flexural Modulus | 1500 MPa |
| Heat Deflection Temperature | 100°C at 0.45 MPa |
| Melting Point | 160°C |
| Notched Izod Impact Strength | 35 J/m at 23°C |
| Rockwell Hardness | R85 |
| Water Absorption | 0.01% in 24 hours |
As an accredited MTEGRITY PP Homopolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MTEGRITY PP Homopolymer is packaged in 25 kg net kraft paper bags with polyethylene lining, ensuring moisture protection and safe handling. |
| Container Loading (20′ FCL) | 20′ FCL: palletized 25kg PP homopolymer bags, container loaded securely, weight optimized, protected from moisture, ready for transport. |
| Shipping | MTEGRITY PP Homopolymer ships as non-hazardous polypropylene pellets in sealed moisture-proof bags or bulk containers. Protect from direct sunlight, heat, and humidity during transit. Store in a cool, dry area. Standard truck, rail, or ocean freight applies, with no special hazard labeling required. |
| Storage | Store MTEGRITY PP Homopolymer in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid prolonged exposure to UV radiation or high temperatures. Keep away from strong oxidizers and static ignition sources. Proper storage preserves material integrity and processability. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in the original, unopened container under dry conditions. |
At wall thicknesses below 0.45 mm, the cavity-filling behaviour of thin-wall packaging grades is governed by flow length-to-thickness ratio rather than by absolute shot volume. For an unfilled PP homopolymer melt with an MFR of 25–50 g/10 min measured under ISO 1133-1:2022, a flow length of 180–250 mm at 1.0–1.5 mm wall section is attainable before the flow front freezes. The MTEGRITY homopolymer lot should be checked against its certificate of analysis; if the MFR falls below 20 g/10 min, short shots in multi-cavity hot-runner dairy cup tools become the dominant defect. Barrel temperatures are set from feed throat to nozzle at 180–230 °C, with nozzle temperature held at 230–250 °C. Mold temperature is maintained at 10–35 °C, and high injection velocities of 200–350 mm/s are required to prevent flow marks on container sidewalls. Holding pressure is typically 40–70 MPa hydraulic, with hold time adjusted until gate freeze is confirmed by part weight stability. Plaque shrinkage of unfilled homopolymer polypropylene ranges from 1.2–1.8% parallel and 1.4–2.0% perpendicular according to ISO 294-4. The terminal thin-wall dairy cup or deli tub exhibits top-load stiffness and creep resistance at refrigeration temperatures up to 65 °C for hot-fill applications, provided the lot contains a nucleation package. Without nucleating agent, cycle time increases by 10–15% and warpage on flat lids becomes more variable. Food-contact compliance for the finished container must be confirmed under FDA 21 CFR 177.1520 and EU 10/2011, with the specific additive stabilizer and processing aid formulation disclosed by the compounder.
Unfilled PP homopolymer is selected for carbonated beverage closures because its flexural modulus, typically 1,200–1,700 MPa under ASTM D790, provides the bridge stiffness required for tamper-evident band release without excessive plastic deformation. The limiting parameter is stress relaxation at the sealing surface under constant CO₂ back-pressure, not short-term strength. Closure bridges are designed with widths between 0.20–0.35 mm and a fracture torque window of 1.0–1.8 N·m. If the melt temperature is raised above 260 °C to reduce viscosity in high-cavitation closure molds, oxidative chain scission can lower molecular weight and reduce torque retention after 7 days of carbonated beverage contact. The processing window is therefore narrower than for general injection molding. Hot-runner manifold temperatures are held at 230–255 °C, mold temperature at 10–30 °C, and cooling time is set to achieve a core temperature below 80 °C before ejection to prevent ovality in the closure skirt. Slip and anti-block concentrates are dosed at 500–1,500 ppm erucamide equivalent, but bridging between the slip additive and the sealing surface can increase carbonation loss if the closure is hot-filled above 45 °C. The finished closure is tested for sealing performance under ASTM D3078 or equivalent package integrity test methods. Limitations include reduced impact resistance below 0 °C; closure designs requiring freezer abuse or drop impact from −20 °C storage should shift to an impact copolymer rather than homopolymer PP.
Biaxially oriented polypropylene film production consumes homopolymer PP in the core layer because the biaxial orientation process raises tensile strength and reduces haze without requiring comonomer. The specific MTEGRITY lot must be evaluated for die lip buildup over a 24 h continuous run if the film is to be metalized. The extruder barrel profile for a 90–150 mm single-screw line is set from 200–245 °C. Melt temperature at the die is maintained between 235–250 °C. Die lip deposit formation is a processing bottleneck attributed to low-molecular-weight fractions and incompatible slip or antistatic additives. Formulation for film grades requires a low-coking stabilizer package. Cast roll temperature is set at 20–40 °C. Higher cast roll temperatures increase spherulite size and raise haze, while lower temperatures increase quench marks and dimensional nonuniformity. The cast sheet is stretched at a draw ratio of 4.0–6.0 in the machine direction at 120–145 °C, followed by transverse direction drawing at 150–170 °C and a draw ratio of 7.0–10.0. Typical barrier film thickness is 15–40 μm. Tensile properties after orientation are tested under ISO 527-3. The homopolymer core layer has poor heat-seal initiation; sealant skins are coextruded with random copolymer or terpolymer polypropylene. Film-to-film coefficient of friction is adjusted with slip additives below 0.30 for packaging machine runnability. The terminal structures include snack food packaging, overwrap, and printed laminate films. Homopolymer PP alone is not suitable for low-temperature shrink film applications because shrinkage force and low-temperature impact are inferior to LLDPE-based structures.
Extruded MTEGRITY homopolymer PP sheet is converted into trays, clamshells, and foodservice containers when the required draw ratio is low to moderate. The sheet line uses a single-screw extruder with a barrier screw of L/D 30–36, a melt pump, and a three-roll polish stack. Melt temperature is held at 190–230 °C; roll stack temperatures are set at 60–90 °C for the upper and middle rolls and 40–70 °C for the lower roll. Sheet thickness ranges from 0.25–1.5 mm. In thermoforming, the lower processing boundary is set by sheet stiffness and the upper boundary by sagging. Unmodified homopolymer PP has a narrow thermoforming window, approximately 160–175 °C. Deep-draw containers with draw ratios above 2:1 require high-melt-strength modification or plug-assist tooling to control wall thickness. At draw ratios above 3:1, homopolymer PP sheet exhibits severe corner thinning and loss of top-load performance. Published data for this specific configuration is limited. The plug material and plug temperature must be matched to the sheet surface; a syntactic foam plug at 80–100 °C improves material distribution without chilling the sheet. Shrinkage after forming is anisotropic, following ISO 11501 for post-forming dimensional stability. The formed container is tested under ASTM D642 for compression resistance and ASTM D5276 for drop performance at ambient temperature. Terminal products include dairy cups, portion packs, and deli trays. Freezer-grade applications below −10 °C are outside the homopolymer performance envelope and require an impact-modified resin.
Typically, slit-tape and monofilament processors running MTEGRITY homopolymer PP set extruder barrel temperatures from 200–230 °C at the die, with a water-bath quench temperature between 25–45 °C. The quench bath temperature controls crystallite size; colder water produces higher drawability but increases tape splitting during fibrillation. A calcium stearate processing aid is dry-blended at 0.05–0.10 wt%, and a UV stabilizer package based on hindered amine light stabilizer is added at 0.10–0.40 wt% for outdoor woven sack service. The extruded tape is drawn at a ratio of 6:1–8:1 through a hot-air oven or heated godet set at 120–150 °C. Drawing increases tenacity from an undrawn value below 1.0 g/denier to 4.5–6.0 g/denier when measured under ASTM D2256. Relaxation of 2–5% on the annealing godet reduces springback and improves dimensional stability. Fibrillation needles then split the tape into yarn at 50–120 μm thickness. The terminal products are FIBC bulk bags, geotextile reinforcement, carpet backing, and artificial turf yarn. Homopolymer PP tape shows limited impact resistance below 0 °C; for frozen-region FIBC applications, a small percentage of LLDPE or an impact copolymer is blended at 5–15 wt% to improve split resistance. Draw ratio above 8:1 can cause tape breakage and fibrillation irregularity, especially if the MFR of the homopolymer lot is above 12 g/10 min.
MTEGRITY homopolymer PP serves as a low-viscosity base for mineral-filled compounds when high stiffness and reduced shrinkage are required. The compounding line is a co-rotating twin-screw extruder with L/D 40–44. Talc at 20–40 wt% is introduced through a side stuffer downstream of the melt seal, with the main feed containing the homopolymer, a maleic anhydride-grafted PP coupling agent at 1–3 wt%, and a primary antioxidant package dosed at 0.10–0.30 wt%. Barrel temperatures are set from 180–230 °C, with vacuum venting below 10 kPa absolute to remove volatiles. The talc addition increases flexural modulus from an unfilled baseline of 1,300–1,600 MPa to 2,500–4,500 MPa, depending on talc aspect ratio and loading, when tested under ISO 178. If the target MFR is above the neat resin MFR, a peroxide masterbatch is dosed at 0.03–0.25 wt% organic peroxide to induce controlled chain scission. The peroxide feed must be placed before the vacuum port to avoid residual decomposition products. Torque and melt temperature rise during peroxide degradation; screw speed is normally limited to 350–500 rpm for 58–75 mm machines. The compounded pellets are tested for ash content under ISO 3451-1, MFR under ISO 1133-1:2022, and tensile properties under ISO 527-2. Terminal parts include automotive interior substrates, appliance housings, and nonstructural brackets. Homopolymer-based talc compounds are not suitable for low-temperature impact applications below −20 °C without elastomer modification, and talc loading above 40 wt% can cause screw wear, increased melt pressure, and reduced weld-line strength.
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Characterisation of MTEGRITY PP Homopolymer begins with its isotactic polypropylene backbone: a linear hydrocarbon of propylene repeat units in which methyl side groups are arranged predominantly on the same side of the polymer chain. The absence of ethylene comonomer separates this product from random copolymers, while the absence of a discrete elastomer phase separates it from impact copolymers. The commercial model designation for MTEGRITY PP Homopolymer follows the supplier nomenclature for unfilled polypropylene homopolymer, with a trailing suffix or digit indicating the nominal melt flow rate under ISO 1133-1:2022. The grade is supplied as a pelletised injection-moulding and compounding feedstock. Published grade-specific mechanical data for this configuration is limited, so property boundaries discussed here are drawn from class-typical values for stabilised polypropylene homopolymer tested under ISO 527-2, ISO 178, ISO 179-1/1eA, ISO 294-4, and ISO 75-2. Applications reported by converters for this polymer class include thin-wall closures, caps, housewares, small-appliance housings, and non-structural automotive interior parts where stiffness, chemical resistance, and rapid crystallisation are required. The material is specified by melt mass-flow rate, tensile yield stress, flexural modulus, notched Charpy impact strength, heat deflection temperature, and mould shrinkage. Compared with polypropylene random copolymers, the homopolymer displays higher tensile modulus and higher heat deflection temperature but lower impact resistance at sub-zero temperatures. Compared with impact copolymers, it exhibits higher stiffness, lower haze, and significantly lower notched Charpy impact strength at 23 °C.
The molecular architecture of MTEGRITY PP Homopolymer produces higher maximum crystallinity because no ethylene interruptions are present in the chain. In a random copolymer, ethylene units are incorporated at low concentrations, typically 1 wt% to 7 wt%, and reduce crystallite size and melting temperature. In an impact copolymer, ethylene-propylene rubber domains, usually 10 wt% to 25 wt%, absorb impact energy but lower modulus and increase haze. The absence of these features in the homopolymer yields a sharper melting peak and more rapid non-isothermal crystallisation. Differential scanning calorimetry under ISO 11357-3 records a typical melting peak for polypropylene homopolymer of 160 °C to 165 °C, compared with 130 °C to 150 °C for many random copolymers. The higher crystallinity translates into higher tensile modulus and heat deflection temperature but also greater mould shrinkage anisotropy. The following table presents class-typical ranges for unfilled injection-moulding polypropylene; the values are not grade-specific certificates for MTEGRITY PP Homopolymer.
| Property | PP homopolymer | PP random copolymer | PP impact copolymer |
|---|---|---|---|
| Tensile modulus (ISO 527-2) | 1200–1800 MPa | 700–1200 MPa | 900–1500 MPa |
| Flexural modulus (ISO 178) | 1300–1900 MPa | 600–1000 MPa | 1000–1600 MPa |
| Notched Charpy at 23 °C (ISO 179-1/1eA) | 2.0–4.0 kJ/m² | 6.0–15.0 kJ/m² | 15.0–40.0 kJ/m² |
| Heat deflection temperature at 0.45 MPa (ISO 75-2/B) | 90–110 °C | 70–90 °C | 80–105 °C |
| Mould shrinkage (ISO 294-4) | 1.0–2.4 % | 1.0–2.0 % | 0.8–1.8 % |
Processing behaviour of MTEGRITY PP Homopolymer is governed primarily by melt mass-flow rate, measured under ISO 1133-1:2022 at 230 °C with a 2.16 kg dead load. For thin-wall injection moulding, converters generally select a homopolymer with a melt mass-flow rate between 8 g/10 min and 25 g/10 min. Higher flow improves filling but carries a measurable penalty in notched Charpy impact, often 0.5 kJ/m² to 1.5 kJ/m² lower than a similar grade at 12 g/10 min. A narrow molecular weight distribution, when declared by the supplier, reduces the shear-thinning slope and provides more stable viscosity across high shear rates; capillary rheometry under ISO 11443 is used to verify this behaviour. Nucleating agents raise crystallisation onset and accelerate solidification, reducing cycle time but increasing the risk of short-shot if gate geometry is inadequate. In a thin-wall cap mould with wall thickness 0.8 mm, injection velocities of 150 mm/s to 300 mm/s and cavity pressures of 30 MPa to 45 MPa are normally required before gate seal. The processing window narrows when mould temperature is held below 30 °C because the frozen layer advances more rapidly and flow resistance rises sharply. Melt temperature is generally maintained between 220 °C and 260 °C. Published data for this specific configuration is limited; the foregoing values are class-typical starting points for thin-wall polypropylene homopolymer and do not replace a validated optimisation study on the production tool.
Melt stabilisation of MTEGRITY PP Homopolymer is normally achieved with a hindered phenol primary antioxidant and a phosphite secondary antioxidant during pelletisation. The formulation must be verified against the intended food-contact or medical-application certificate. Under European Commission Regulation (EU) No 10/2011, overall migration must not exceed 10 mg/dm² of food contact surface when tested under the appropriate food simulant. Under U.S. FDA 21 CFR 177.1520, the olefin polymer must meet extractables and end-use conditions for the intended polymer type. Compliance is formulation-specific and cannot be assumed from the base polymer alone. Processing is also sensitive to copper and iron contamination, which accelerate oxidative degradation at melt temperatures above 230 °C. The material should be stored in dry conditions and, if ambient relative humidity exceeds 60 %, pre-drying at 80 °C for 2 h is recommended to avoid surface splay from hydrolysed additives. Amine-based slip and antistatic packages should be evaluated for interaction with the stabiliser system, because amine chemistry can reduce oxidative induction time under ISO 11357-6.
Compounding of MTEGRITY PP Homopolymer on a co-rotating twin-screw extruder with L/D 40:1 requires controlled specific energy input. Typical barrel temperatures range from 180 °C in the feed zone to 220 °C at the die, while screw speeds between 400 rpm and 800 rpm generate shear heating that may raise melt temperature above the set point. In production-scale operations, process bottlenecks often appear as vent-port flooding when vacuum at the atmospheric or devolatilising vent falls below -0.08 MPa, particularly with mineral-filled or glass-filled formulations. For glass-fibre reinforcement at 20 wt% to 30 wt%, side-feeding downstream of the melting zone and use of a low-compression mixing section are required to limit fibre breakage to a median length above 200 µm. The resulting tensile strength under ISO 527-2 increases, but notched Charpy impact under ISO 179-1 remains anisotropic. Specific energy input for unfilled homopolymer compounding commonly falls between 0.18 kWh/kg and 0.24 kWh/kg. Readings outside this range on a given line indicate screw-lubrication, barrel-wear, or feed constriction problems. In single-screw injection units, excessively high back pressure can degrade molecular weight and increase melt flow rate by 2 g/10 min to 5 g/10 min during the next heat history.
Preparation of multipurpose test specimens of MTEGRITY PP Homopolymer according to ISO 294-1 uses a type 1A tensile bar cavity. A class-typical parameter set for unfilled homopolymer is melt temperature 230 °C, mould temperature 40 °C, injection velocity 200 mm/s, hold pressure 50 MPa, and back pressure 5 MPa. Hold pressure is maintained until gate freeze-off; premature release creates sink marks and increases mould shrinkage by 0.3 % to 0.6 % as measured by ISO 294-4. Clamp force is selected for projected area and cavity pressure, not barrel size. For a cavity pressure of 35 MPa, the required clamp force is approximately 1.0 t/cm² of projected area. Gate depth is typically 50 % to 70 % of the nominal wall thickness for an edge gate, while hot-runner valve gates require a temperature profile no more than 15 °C above the melt set point to avoid local molecular weight loss. The homopolymer crystallises quickly; therefore the screw cushion should be held between 3 mm and 6 mm to maintain stable switch-over position. Published grade-specific processing data for MTEGRITY PP Homopolymer is limited, and these values are class-typical starting points that must be adjusted on the actual injection moulding machine.
Differential shrinkage between the flow and cross-flow directions in MTEGRITY PP Homopolymer can cause out-of-plane distortion in large-area parts. Under ISO 294-4, unfilled homopolymer typically shows longitudinal mould shrinkage of 1.0 % to 2.4 % and transverse shrinkage that differs by as much as 0.4 %, depending on gate position and nucleating agent type. Talc or glass reinforcement lowers total shrinkage and reduces anisotropy; a 20 wt% talc-filled homopolymer typically shrinks between 0.6 % and 1.0 % under the same standard. Sink marks in ribbed sections are controlled more by packing pressure decay than by melt temperature. Increasing hold pressure from 30 MPa to 50 MPa reduces sink depth but may increase stress concentration at the gate. Where low-temperature impact is not critical, beta-nucleating agents can raise notched Charpy impact from 2.5 kJ/m² to 6.0 kJ/m² under ISO 179-1/1eA while slightly lowering heat deflection temperature under ISO 75-2/B. Processors should avoid annealing below 100 °C if dimensional stability is required, because incomplete secondary crystallisation can lead to post-mould shrinkage above 0.2 % after 48 h at ambient storage.
Food-contact and medical use of MTEGRITY PP Homopolymer requires grade-specific certification because the base polymer does not automatically confer compliance across all applications. Under European Commission Regulation (EU) No 10/2011, migration testing is performed in food simulants A, B, and D2 for the intended temperature and time conditions, and overall migration must remain below 10 mg/dm². Under U.S. FDA 21 CFR 177.1520, the polymer may be used in contact with food only if its composition and extractables meet the stipulated conditions of use. High-temperature cooking above 100 °C may require additional testing in oil simulants. For pharmaceutical packaging, USP 661.1 provides a plastics evaluation framework, but specific monographs may require additional biological reactivity testing. REACH Article 33 communication applies to formulated compounds containing substances of very high concern above 0.1 wt%. The homopolymer is not recommended for repeated steam sterilisation at 121 °C because heat deflection temperature under load and oxidative stability decline after multiple cycles, and deformation may occur under closure load. Gamma irradiation at 25 kGy can produce chain scission, yellowing, and a measurable increase in melt flow rate. Ethylene oxide sterilisation may require extended aeration because sorption of the sterilant is possible in semicrystalline hydrocarbon matrices. Published data for this specific configuration is limited, and each supply lot must be verified against the end-use packaging standard.
