| HS Code | 359318 |
| Melt Flow Rate 230 C 2 16 Kg | 45 g/10 min |
| Density | 0.90 g/cm³ |
| Tensile Strength At Yield | 35 MPa |
| Elongation At Yield | 10% |
| Flexural Modulus | 1500 MPa |
| Notched Izod Impact Strength 23 C | 3 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 105°C |
| Vicat Softening Temperature | 150°C |
| Rockwell Hardness | R-105 |
| Melting Point | 165°C |
As an accredited REPOL PP Homopolymer H045SG factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | REPOL PP Homopolymer H045SG is supplied in 25 kg multi-layer paper bags, heat-sealed and palletized for safe transport and storage. |
| Container Loading (20′ FCL) | 20' FCL: PP homopolymer H045SG loaded on pallets in woven bags, secured for safe transport, preventing contamination and damage. |
| Shipping | REPOL PP Homopolymer H045SG is shipped as non-hazardous polypropylene pellets in sealed bags or bulk containers. Store in dry, ventilated areas away from heat sources. Avoid moisture contamination and prolonged UV exposure. Use covered transport to protect packaging, and handle with standard material handling equipment. |
| Storage | Store in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and strong oxidizers. Keep containers tightly sealed to prevent moisture absorption and contamination. Ideal temperature is below 30°C. Avoid prolonged storage in humid conditions. Use within 12 months of receipt for optimal performance. Handle with care to prevent bag damage. |
| Shelf Life | Shelf life is indefinite if stored properly in original packaging, away from moisture, heat, and direct sunlight. |
At a nominal melt flow rate of 4.5 g/10 min determined under ISO 1133-1:2022 Method A, REPOL PP Homopolymer H045SG occupies the lower end of the medium-flow injection moulding window, a position that permits adequate thin-wall filling in multicavity rigid food-contact containers while limiting the elevated warpage tendency associated with higher-flow grades. In thin-wall packaging production, the material is processed neat or with 2–4 wt% polypropylene-based pigment masterbatch; the addition ratio is maintained below 5 wt% non-polyolefin components to avoid shifting the base compliance profile under FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011 as amended, where the overall migration limit is 10 mg/dm² using food simulant D2 for fatty foods or simulant A for aqueous and acidic product categories. Production is carried out on high-speed injection moulding machines with clamp force between 150 and 350 tonnes, accumulator-assisted injection speeds above 300 mm/s, and screw L/D ratios of 20:1 to 24:1 with compression ratios of 2.5:1 to 3.0:1. Melt temperature is held at 230–250 °C, and residence time above 250 °C is limited to 10 min to suppress oxidative chain scission and yellowing. Mould temperature is controlled from 15 °C to 40 °C; mould temperatures above 40 °C extend cooling time and increase sink mark depth on rib-to-wall junctions. Terminal products include dairy tubs, deli pots, takeaway food containers, and dry-food overcap lids. A documented boundary is that H045SG is a homopolymer without ethylene comonomer; containers dropped at temperatures below 0 °C may exhibit brittle fracture unless wall geometry includes radial stiffening ribs or the customer drop-test protocol is reduced accordingly.
On high-cavitation thin-wall tools running cycle times below 6 s, field experience with homopolymer polypropylene of this MFR class indicates that shot-weight consistency depends more on non-return valve condition than on plastication capacity; cushion values below 2 mm can generate shot-weight drift above ±0.3%. This condition is relevant to H045SG because the same medium-flow rheology that reduces warpage also requires stable hold-pressure transfer from the accumulator. When regrind above 20 wt% is introduced, pre-drying at 80 °C for 2 h is recommended if storage relative humidity exceeds 60%; otherwise surface moisture from condensed storage produces splay in fast-fill thin-wall moulds. For fatty-food applications, migration testing according to EN 1186-14 is used to confirm the overall migration limit under the intended contact time and temperature. The homopolymer backbone of H045SG does not provide the sub-ambient impact performance of an impact copolymer, and this limitation should be treated as a design input rather than as a post-moulding correction.
The fatigue resistance of an integral hinge made from H045SG is governed primarily by molecular orientation across the hinge web rather than by the base resin notched Charpy value; gate location must therefore be engineered to direct the flow front perpendicular to the hinge axis. The hinge section is typically moulded from neat H045SG or from a formulation containing 0.5–1.0 wt% nucleating masterbatch to reduce spherulite diameter and delay hinge whitening, with 2–3 wt% polypropylene-based colour masterbatch in the lid body; total non-polyolefin additive content is kept below 4 wt% to preserve hinge flexural endurance. Process parameters on conventional hydraulic or servo-electric injection moulding machines include a melt temperature of 220–250 °C, a mould temperature of 20–40 °C, and a hold pressure of 60–80% of the peak injection pressure. Hold time is set between 4 s and 8 s for hinge thicknesses from 1.5 mm to 2.0 mm, after which cooling is continued until the hinge web reaches a demoulding temperature below 70 °C. For food-contact hinged closures, FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011 apply, with the overall migration limit of 10 mg/dm² demonstrated under the intended contact time and temperature. For personal-care or industrial hinged dispensers that do not contact food, REACH Regulation (EC) No 1907/2006 and packaging heavy-metal limits under Directive 94/62/EC are the operative compliance baseline. Terminal parts include flip-top dispensing caps, cosmetic overcap assemblies, hinged lunch-box lids, and toolbox organisers. A known process limitation is that mould temperatures below 20 °C produce frozen-in stress that appears as immediate whitening at first flex; post-mould annealing at 100 °C for 30 min can partly relieve this condition but may distort thin lid sections and is generally not economical in high-cavitation closure production.
Short glass fibre reinforced compounds based on H045SG are prepared on co-rotating twin-screw extruders rather than by direct metering of chopped strand into an injection moulding machine, because direct addition in moulding produces severe screw and check-ring abrasion and uncontrolled fibre attrition. Typical letdown ratios are 10–30 wt% chopped glass fibre with a nominal filament diameter of 10–17 µm and an initial fibre length from 3 mm to 4.5 mm, combined with 0.5–2.0 wt% maleic anhydride-grafted polypropylene coupling agent, 0.1–0.3 wt% phenolic/phosphite antioxidant blend, and 0.1–0.2 wt% calcium stearate or hydrotalcite acid scavenger. The extruder configuration uses an L/D ratio of 40:1 to 48:1, a downstream side feeder for fibre introduction after the polymer melting zone, and moderate distributive mixing elements to reduce fibre length loss. Barrel temperatures are held between 220 °C and 240 °C, with die melt temperature controlled below 245 °C; vacuum venting at -0.08 MPa removes residual moisture and volatiles. Specific mechanical energy for 30 wt% glass-filled homopolymer polypropylene in similar screw configurations is typically reported in the range 0.20–0.30 kWh/kg, though published data for this exact grade and extruder configuration is limited. Final injection moulding of the compound uses melt temperatures of 230–250 °C and mould temperatures of 30–70 °C to reduce fibre orientation anisotropy; higher mould temperatures improve weld-line strength but extend cycle time. Mechanical testing under ISO 527-2:2012, ISO 178:2019, and ISO 75-2:2013 Method A is used for lot acceptance, with specimens moulded according to ISO 294-1:2017. Terminal parts include automotive fan shrouds, front-end carrier brackets, appliance structural bases, and under-bonnet covers where short-glass stiffness and heat resistance are required rather than sub-ambient toughness. A characteristic process limitation is weld-line tensile strength; in short-glass polypropylene compounds, weld-line values under ISO 527-2:2012 commonly fall below 70% of the unwelded reference, and gate position must avoid placing weld lines in load-bearing bosses.
In injection moulding of the resulting compound, residual fibre length after moulding is typically reduced to 0.3–1.0 mm as a result of screw recovery shear and gate-land shear; gate sizes below 2.0 mm intensify this attrition and should be avoided in load-bearing ribs. Heated moulds at 30–70 °C are required for parts requiring flatness, because differential fibre orientation between skin and core creates warpage that increases with injection speed and decreases with mould temperature. For glass fibre content verification, ash content is measured according to ISO 3451-1:2019 Method A; this value is cross-checked against the supplied certificate of analysis to detect letdown errors on the compounding line.
Appliance internal brackets, pump housings, and HVAC drain pans are injection moulded from talc-modified homopolymer compositions in which H045SG functions as the continuous phase and compacted talc masterbatch supplies flexural modulus above 2,500 MPa when tested under ISO 178:2019; published data for this exact grade and talc source is limited, so the value should be confirmed against the supplier certificate of analysis. The addition ratio of talc masterbatch is 10–40 wt%, with the remaining 60–90 wt% being H045SG plus antioxidant and colour masterbatches; talc loadings above 40 wt% are generally avoided in injection moulding because weld-line strength and screw/barrel wear become process-limiting. Melt temperature is maintained at 220–240 °C, mould temperature at 20–50 °C, and the higher compound viscosity relative to neat H045SG requires increased hold pressure and longer cooling time for thick pump-housing bosses. If the component is used in electrical or electronic appliances, Directive 2011/65/EU RoHS restricts lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE; the talc and stabiliser system must be selected to avoid restricted substances. For general industrial components, REACH Regulation (EC) No 1907/2006 applies to the supplied compound. Terminal product types include washing-machine pump housings, air-conditioner drain pans, internal bracket assemblies, and rigid appliance chassis panels. A processing boundary is that talc-filled compounds display higher thermal conductivity and faster skin formation than neat H045SG; if injection speed is too low, visible flow lines and weld-line troughs form on textured surfaces.
The large, thick-wall geometry of logistics crates places different demands on H045SG than thin-wall packaging: the medium-flow rheology supports wallstock uniformity in sections from 3 mm to 6 mm when clamp force, injection speed, and hold pressure are correctly matched. The base formulation is either 100 wt% H045SG or 95–98 wt% H045SG with 2–4 wt% UV stabiliser masterbatch and 0.5–1.0 wt% antioxidant masterbatch; where cold-drop performance below -10 °C is specified on a logistics tender, 3–6 wt% polyolefin elastomer may be added, but this moves the property profile away from a pure homopolymer and reduces flexural modulus. Injection moulding machines for crates and totes are specified with clamp force between 500 tonnes and 1,500 tonnes, melt temperature of 220–250 °C, and mould temperature of 15–35 °C; hold pressure is maintained in the range 40–70 MPa until gate freeze is achieved. Demoulding below 70 °C is necessary to prevent corner distortion and stack-fit mismatch; forced water circulation in mould cores is used because thick sections retain heat much longer than thin-wall packaging. Regulatory compliance for distribution crates in Europe references REACH Regulation (EC) No 1907/2006 and heavy-metal limits under Directive 94/62/EC, where the sum of lead, cadmium, mercury, and hexavalent chromium must not exceed 100 mg/kg. Terminal products include stackable logistics crates, agricultural harvesting crates, distribution totes, and pallet boxes. The primary outdoor limitation is oxidative embrittlement of unstabilised H045SG; unpigmented or insufficiently stabilised surfaces can develop surface cracking within one year of UV-exposed storage, so UV stabiliser loading must not be reduced without end-use weathering validation.
In general-purpose housewares, H045SG is processed with 2–5 wt% colour masterbatch and 0.5–2 wt% slip/antiblock masterbatch, with regrind cascaded at 20–30 wt% after pre-drying at 80 °C for 2 h when storage relative humidity exceeds 60%. Conventional clamp forces of 80–250 tonnes, melt temperatures of 210–240 °C, and mould temperatures of 15–35 °C are used; flow-length-to-wall-thickness ratio is kept below 150:1 to avoid short shots in elongated handles or lid rims. Compliance is via REACH Regulation (EC) No 1907/2006, with FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011 applying only to dry-food storage articles made from food-compliant regrind. Terminal products include storage boxes, garment hangers, dustpans, waste bins, and drawer organisers. The main process failure mode is dimensional variability from uncontrolled regrind particle size above 8 mm; regrind fractions above 30 wt% are avoided unless gravimetric dosing accuracy is confirmed at the feed throat.
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REPOL PP Homopolymer H045SG is a polypropylene homopolymer injection-moulding grade distinguished from the producer’s impact copolymer and random copolymer series by the absence of an ethylene–propylene rubber phase. The designation indicates a homopolymer backbone and a nominal melt mass-flow rate of 4.5 g/10 min when determined at 230 °C under 2.16 kg using ISO 1133-1:2022. The middle numeric field is not a guaranteed lot value; the supplier-issued certificate of analysis supersedes the nominal classification. The grade is commonly used in injection-moulded components with wall thickness from 1.0 mm to 3.0 mm, but filling behaviour is tool-dependent and should be verified by instrumented flow simulation or short-shot progression on the production machine. Representative mechanical values are not part of this general introduction because tensile, flexural, and impact results are sensitive to specimen conditioning and moulding temperature. For reproducible comparative data, specimens should be moulded under ISO 294-1:2017 or ISO 1873-1:1995 and tested according to ISO 527-2:2012, ISO 178:2019, and ISO 180:2000. The chemical identity of the polymer is polypropylene, CAS 9003-07-0. Because the material is a non-hygroscopic PP-H, pre-drying is not normally required; however, if containers or silos are stored below dew point and condensation forms, a desiccant dryer at 80 °C for 2–4 hours may be applied to prevent surface splay defects. Published creep and fatigue data for this specific grade are limited, so load-bearing parts should be qualified with ISO 899-1:2017 tensile creep and ISO 22088 environmental stress-cracking protocols.
Process stability for this MFI class is bounded primarily by melt temperature, mould temperature, and hold-pressure timing. A barrel set-point window of 200–250 °C is applicable for PP-H, with a narrower working band of 220–240 °C recommended for general-purpose cold-runner tools. Operation above 260 °C should be limited to short residence times because prolonged thermal exposure can increase chain scission and shift the melt viscosity below the design window. Mould surfaces should be held between 20 °C and 50 °C; lower temperatures increase solid-skin formation and promote in-plane orientation, which can raise measured shrinkage anisotropy when evaluated on a 60 mm × 60 mm × 2 mm plaque according to ISO 294-4. Higher mould temperatures reduce orientation but extend cycle time and may increase gloss variation across ribbed sections. Injection pressure is not a fixed value; it must be set below the safety chart of the machine and tuned using a weight-stabilisation curve. In multi-cavity hot-runner tools, a cushion of 3–6 mm, back pressure of 4–8 MPa, and hold pressure from 60 MPa to 100 MPa are typical starting points for PP-H in this MFR band; however, these values are not product-specific and must be adjusted per tool geometry and gate configuration. Screw design on a reciprocating injection machine should use an L/D ratio of at least 20:1, typically 20:1–24:1, with a compression ratio of 2.5:1–3.5:1. Excessively high screw speed or back pressure can over-shear the melt. Lot-to-lot MFR variation of ±0.3 g/10 min is routinely observed in PP-H production; therefore, machine settings should be re-confirmed against part weight after every silo change. Gate freeze should be detected by plotting part weight against hold time and selecting the time at which weight increase falls below 0.01 g per additional second. For high-speed filling of thin sections below 1.5 mm, the use of an instrumented nozzle pressure curve is advised because cavitation in the metering zone can occur if screw recovery time is shorter than the plastication time required by the cycle.
To interpret the position of H045SG within the manufacturer’s homopolymer line, a comparison based on melt flow index is more relevant than a comparison of additive packages. H030SG, H045SG, and H090SG form a flow series in which the numerical field denotes the nominal melt mass-flow rate in g/10 min under ISO 1133-1:2022 at 230 °C and 2.16 kg. The H045SG grade therefore occupies an intermediate flow position. In practical injection moulding, a lower MFR such as 3.0 g/10 min produces a more viscous melt, higher injection pressure demand, lower flash tendency, and generally better stress-crack resistance in thick sections. A higher MFR such as 9.0 g/10 min produces a less viscous melt, longer spiral flow length, reduced clamp force demand, and may be preferred for long-flow thin-wall mouldings. The intermediate H045SG grade is often selected when the tool requires enough flow to fill multiple thin ribs but still needs higher stiffness and better dimensional retention than a high-flow random copolymer. The comparative table below summarises only the nominal flow classification; it does not replace rheological characterisation. Capillary rheometry at 210 °C and 230 °C using ISO 11443:2021 is recommended when gate pressure or shear heating is expected to be process-limiting.
| Attribute | H030SG | H045SG | H090SG |
|---|---|---|---|
| Nominal melt mass-flow rate | 3.0 g/10 min | 4.5 g/10 min | 9.0 g/10 min |
| Flow classification relative to H045SG | Lower | Intermediate | Higher |
| Relative injection pressure at constant wall thickness | Higher | Control | Lower |
| Typical application orientation | Thick-wall structural parts | General-purpose injection-moulded parts | Thin-wall or long-flow components |
The nominal values in this table are supplier-classification data and do not replace the certificate of analysis for the specific lot.
Substitution of an impact copolymer by H045SG changes the failure behaviour and requires cautious design review rather than direct replacement. Polypropylene impact copolymers contain an ethylene–propylene rubber phase that raises notched impact absorption at low temperature, particularly below 0 °C. H045SG, as a homopolymer, does not contain this dispersed rubber phase and therefore shows lower resistance to brittle fracture under high-speed loading. The trade-off is an increase in stiffness and a higher heat deflection temperature under load. In applications with sharp corners, snap-fits, or insertion loadings, the reduction in low-temperature notched impact must be evaluated with ISO 179-1:2010 or ISO 180:2000 specimens milled from production parts as well as laboratory plaques. A minimum radius of 0.5 mm at internal corners is typically required to reduce stress concentration, but this value depends on wall thickness and loading rate. For parts that will be exposed to sub-zero temperatures during transport, specified impact values should be measured at -20 °C and -30 °C, not only at 23 °C. Painting and adhesive bonding are more difficult on PP-H due to low surface energy; corona treatment or flame treatment is used to raise surface polarity, and pull-off adhesion should be tested under ISO 2409. When replacing a nucleated random copolymer, H045SG may show higher tensile yield stress but lower clarity and higher haze. Transparent packaging applications are therefore not suitable for this grade unless clarity testing under ASTM D1003 demonstrates otherwise. As a homopolymer, chemical resistance to a range of acid and base solutions is documented; however, strong oxidising acids at elevated temperature can attack the polypropylene chain. Environmental stress-cracking resistance in detergent solutions should be checked with ISO 22088-3:2006 for stressed clip designs.
On the production floor, defect patterns in H045SG are closely linked to hold-pressure decay and gate freeze. Sink marks above a depth of 0.01 mm can appear in ribbed areas if the packing phase is stopped before gate seal; this is quantified by surface profilometry or visual comparison under obliquely incident light. To stabilise part mass, a short-shot study is performed with velocities that advance the melt front progressively from 80% to 98% volumetric fill, and the transfer point from injection to packing is set to prevent overfill of the cavities. Hot-runner valve-gate tools require a gate stem delay of 0.1–0.5 s after packing start to avoid premature freeze and internal voids, though the correct delay is specific to the manifold volume and gate diameter. Since H045SG is supplied in pellet form without a deliberate moisture-sensitivity package, regrind incorporation is possible, but the practice should be controlled. A regrind fraction above 30 wt% can reduce melt viscosity due to prior thermal history and can widen part weight variation if flake bulk density is unstable; a gravimetric blender with ±0.5 wt% accuracy is required for consistent output. When glass-reinforced PP is used in the same manufacturing cell, cross-contamination must be prevented because residual glass fibre increases nozzle wear and raises the effective viscosity of H045SG. The grade should not be blended with incompatible fillers without prior twin-screw compounding on a 25:1 L/D machine unless the additive masterbatch is specifically designed for PP-H. Colour masterbatches based on incompatible carriers can reduce tensile elongation at break by more than 50%; therefore, carrier resin compatibility testing according to ISO 527-2 is recommended before production colour changes.
Compliance statements for H045SG should be obtained from the supplier’s product stewardship documentation. As an olefin polymer, the grade may meet the general requirements of FDA 21 CFR 177.1520, but the regulation includes end-use limitations such as food type, temperature, and total extractable fraction. A product compliance letter is required before food-contact use. In the European Union, the grade should be evaluated under Regulation (EU) No 10/2011, Annex I, with overall migration testing according to EN 1186-1:2002 and specific migration testing for additives if the component is coloured or contains processing aids. REACH compliance under EC 1907/2006 requires confirmation that the grade contains no candidate-list SVHC above 0.1% w/w and that Annex XVII restrictions are observed. RoHS compliance under Directive 2011/65/EU, Annex II, requires supplier declaration that lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE do not exceed the specified weight thresholds. The table below lists the central document set for an injection moulder qualifying H045SG.
| Regulation | Standard or clause | Qualification requirement |
|---|---|---|
| United States food contact | FDA 21 CFR 177.1520 | Supplier product compliance letter; end-use condition check |
| European food contact | Regulation (EU) No 10/2011, Annex I | Overall migration per EN 1186-1:2002; specific migration for additives |
| REACH | EC 1907/2006, Annex XVII and SVHC candidate list | SVHC statement; 0.1% w/w item-level calculation |
| RoHS | Directive 2011/65/EU, Annex II | Supplier declaration for restricted heavy metals and flame retardants |
Dimensional stability after demoulding is governed by the progressive crystallisation of the homopolymer matrix. Unreinforced PP-H parts in the wall thickness range 1.5–3.0 mm typically show as-moulded shrinkage of 1.0–2.0% in the flow direction and a lower value in the transverse direction, but these values are geometry-dependent and should be measured on an ISO 294-4 shrinkage plaque. Post-demoulding crystallisation can continue for 24–48 h at 23 °C; during this period, a further dimensional shift of 0.1–0.3% may occur. For assemblies requiring immediate dimensional checking, parts should be stored at 23 °C ± 2 °C and 50% ± 10% RH for at least 24 h before metrology. Conditioning under ISO 291 is recommended for consistent comparison. For parts exposed to elevated service temperatures, thermal ageing can increase post-shrinkage; continuous exposure at 80 °C may produce additional shrinkage above the room-temperature value, though H045SG-specific published data for long-term heat aging is limited. Testing of oriented sections by differential scanning calorimetry according to ISO 11357-3 can quantify the crystalline fraction and identify undercooled material that may drift dimensionally. In thick sections, shrinkage voids can occur if the centre of the part remains molten after the gate freezes; improved packing pressure and longer hold time are used to reduce void content, while ultrasonic inspection or X-ray computed tomography is used for hidden voids in safety-relevant components. Because no external plasticiser or impact modifier is present, migration levels to food simulants may be limited, but extracted-substance testing per Regulation (EU) No 10/2011 is still required when the final component is sold as a food-contact article.
