| HS Code | 134706 |
| Density | 0.906 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 2.0 g/10 min |
| Tensile Strength At Yield | 33 MPa |
| Elongation At Yield | 10% |
| Flexural Modulus | 1520 MPa |
| Notched Izod Impact 23 C | 32 J/m |
| Heat Deflection Temperature 0 45 Mpa | 99°C |
| Vicat Softening Point | 154°C |
| Rockwell Hardness | R105 |
| Melting Point Dsc | 165°C |
As an accredited MARLEX PP HGX 030SP factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | MARLEX PP HGX 030SP polypropylene homopolymer pellets are supplied in 25 kg moisture-protective bags for processing. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): A full 20-foot container of MARLEX PP HGX 030SP polypropylene resin, securely palletized in bags for safe transport. |
| Shipping | MARLEX PP HGX 030SP is a polypropylene resin supplied as pellets. It is non-hazardous and not regulated as dangerous goods for shipping. Transport in clean, dry containers, protecting from moisture and excessive heat. Avoid contamination and direct ignition sources. Standard handling is safe, with no special labeling required. |
| Storage | Store MARLEX PP HGX 030SP in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep original containers tightly closed to prevent moisture contamination and dust accumulation. Avoid contact with oxidizers. Maintain good housekeeping to minimize static discharge and slipping hazards. Use grounded equipment when transferring material. |
| Shelf Life | Shelf life is indefinite when stored in a cool, dry area, protected from UV, heat, and moisture. |
When MARLEX PP HGX 030SP is processed on a sequential biaxial orientation line, the nominal 3.0 g/10 min melt flow rate measured at 230°C/2.16 kg under ISO 1133-1:2022 defines a melt-viscosity band that is maintained between 245°C and 255°C at the flat die. The cast base sheet is quenched on a polished chill roll held between 20°C and 35°C, because higher quench temperatures reduce surface nucleation and create a spherulitic skin that raises haze beyond the 3% threshold measured under ASTM D1003-21. Lower chill roll temperatures below 15°C promote condensation and uneven melt pinning, which appears as transverse gauge bands that survive machine-direction orientation. The as-cast sheet, typically 1.8 mm to 2.5 mm, is preheated to 120°C–130°C before machine-direction stretching at a draw ratio between 4.5 and 5.5. Transverse orientation follows in a stenter oven at 130°C–145°C with a draw ratio between 7.0 and 9.0. The annealing section is held at 150°C–160°C with a rail retraction of 5% to 10% to reduce shrinkage in the finished film. On production lines without automatic die-lip thickness control, edge-beat variation in the cast sheet is amplified by the square of the transverse draw ratio, producing finished film gauge deviations above ±5%. The oriented film, at final thickness 15 µm to 40 µm, exhibits typical machine-direction tensile modulus values from 2.0 GPa to 2.5 GPa under ASTM D882-18 or DIN EN ISO 527-3:2018 and is used as heat-sealable print web after coextrusion of a lower-melting copolymer skin. For food-contact structures, compliance is verified under FDA 21 CFR 177.1520(c) 1.1 and EU Regulation 10/2011; migration testing follows the food simulant and time-temperature conditions defined in Annex III of the regulation. Surface energy of the homopolymer core after orientation remains in the 29–31 dyn/cm range, requiring inline corona discharge of 10–15 W·min/m² to raise the print anchoring surface to 38–42 dyn/cm. REACH compliance under Regulation (EC) 1907/2006, Article 33, requires declaration of SVHC content if exceeding 0.1 wt%; the unmodified homopolymer normally falls below this threshold. Edge trim and oriented film scrap can be reintroduced into the cast sheet extruder at up to 20 wt% without measurable gel increase when a screen pack of 60/80/100 mesh is used; above this level, optical defects and draw breaks increase on stenter lines.
| Process stage | Operating band | Measurement method |
|---|---|---|
| Melt temperature at flat die | 245°C–255°C | In-line IR melt thermocouple |
| Chill roll surface temperature | 20°C–35°C | Contact surface pyrometer |
| Machine-direction draw ratio | 4.5–5.5 | Roll-speed tachometer differential |
| Transverse-direction draw ratio | 7.0–9.0 | Stenter rail position data |
| Annealing temperature | 150°C–160°C | Stenter zone thermocouple |
| Corona discharge dosage | 10–15 W·min/m² | Line-speed-normalized power meter |
The production of oriented monofilament from MARLEX PP HGX 030SP on a single-screw extrusion line with 45 mm to 65 mm barrel diameter and an L/D of 30:1 requires a melt temperature between 220°C and 240°C at the spinneret. The extrudate enters a water quench bath through an air gap of 20 mm to 30 mm, and the bath is maintained at 28°C to 40°C. This quench band is structurally significant: bath temperatures above 42°C slow the radial cooling front and permit the growth of larger α-spherulites, which reduce the maximum stable draw ratio to below 6.0 and create surface roughness that is detected as an increase in denier coefficient of variation under ASTM D2256/D2256M-21. Bath temperatures below 25°C freeze an amorphous skin that tears during first-stage orientation and produces fibrillar splitting in the final monofilament. The quenched filament is reheated in a multi-roll hot-air oven with zone temperatures between 130°C and 150°C and drawn at ratios of 6.0 to 8.0. A second relaxing stage at 120°C to 130°C retracts the filament by 5% to 8% and fixes hot-air shrinkage below 3% when tested at 130°C for 10 min. Final monofilament diameters between 0.15 mm and 0.60 mm are monitored continuously by laser diameter gauges; a diameter oscillation greater than ±0.01 mm over the bobbin traverse indicates quench bath turbulence or draw-roll speed mismatch. The wound monofilament is converted into woven geotextile, FIBC body fabric, rope, and agricultural netting. Outdoor geotextile grades require a compounded HALS package at 0.3 wt% to 0.6 wt%; dispersion below this threshold causes brittleness after 12–18 months of UV exposure, while overdosing above 0.8 wt% can reduce draw strength and increase extrusion smoke. Barrel temperature profiling for this application typically places the feed zone at 180°C and the metering zone at 220°C, with breaker plate pressure maintained below 180 bar to prevent screen pack blow-through. A gear pump between the extruder and spinneret is required to limit melt-pressure pulsation below ±0.5 bar; larger pulsations create periodic density variations that survive drawing as weak points in woven fabric.
Before thermoforming tooling is selected for MARLEX PP HGX 030SP sheet, the flat-die extrusion line must hold gauge variation below ±1.5% across the sheet width. Extruded sheet from this grade typically ranges from 0.5 mm to 3.0 mm and is produced on a single-screw extruder with a barrier screw and 30:1 L/D, operating at a melt temperature of 230°C to 250°C. The die gap is set 10% to 25% larger than the target sheet thickness to accommodate die swell and draw-down. Polished horizontal or vertical chill rolls are held between 20°C and 40°C. A chill roll set below 15°C chills the sheet surface too rapidly for sufficient relaxation, raising frozen-in stress that warps the sheet during the subsequent oven cycle. Thermoforming of the sheet is performed when the core surface temperature reaches 165°C to 175°C, measured by non-contact infrared pyrometer. At core temperatures below 160°C, the sheet retains excessive elasticity and does not reproduce fine cavity ribs or corners. Above 180°C, sag becomes severe and wall thickness distribution in positive pressure forming can exceed 25% coefficient of variation, particularly for draw ratios deeper than 1.5:1. Vacuum-only tooling can form shallow trays, lids, and cups; pressure-assisted forming at 2–5 bar is necessary for thicker sections or textured surfaces. Mold temperature in contact areas is maintained at 20°C to 40°C to balance cycle time against surface blush. Finished packaging from MARLEX PP HGX 030SP can be used in food-contact forming when the sheet meets the overall migration limit of 10 mg/dm² under EU Regulation 10/2011 and the relevant FDA 21 CFR 177.1520(c) 1.1 conditions for polypropylene homopolymer. Edge trim and skeletal scrap can be reintroduced at up to 30 wt% without significant loss of melt strength; above this level, gel flecks and black specks from thermal degradation increase in the finished sheet. Homopolymer sheet also lacks the ethylene comonomer softness of random copolymer thermoforming grades, so shallow-container sidewall angles above 10° improve demolding consistency and reduce retained stress cracking.
On cast film equipment with 90 mm to 120 mm grooved-feed extruders and flexible lip dies, MARLEX PP HGX 030SP is processed at 240°C to 250°C to generate a melt curtain that is pinned to a chill roll set at 12°C to 25°C. The air knife is positioned 2 mm to 5 mm behind the die-to-chill-roll contact point and operated at 20 m/s to 35 m/s; insufficient air velocity allows the melt curtain to vibrate, producing transverse wrinkles and uneven film thickness. Cast film from this grade is commonly produced at 20 µm to 80 µm for packaging lamination, stationery film, and textile garment covers. The quench rate determines the degree of mesomorphic versus α-monoclinic crystallinity. Rapid cooling on a chill roll below 18°C produces a lower-density surface layer with a gloss reading above 90 GU at 60° under ASTM D2457-21; slower cooling above 30°C increases haze above 2.5% under ASTM D1003-21 and reduces dart impact after lamination. Winder section control is set to maintain a tapered tension profile between 10 N/m and 15 N/m for 30 µm film; constant-tension winding above 20 N/m induces blocking and core crushing on extended rolls. The film is sold as uncoated print web or as the sealing layer in multi-layer lamination structures. For food packaging, the cast film must comply with FDA 21 CFR 177.1520(c) 1.1 and EU Regulation 10/2011; converters should verify specific migration limits for the intended food type and shelf-life condition. If the film is used in electrical or electronic packaging, RoHS Directive 2011/65/EU as amended by (EU) 2015/863 applies at article level, and the base polymer is not expected to contain restricted cadmium, lead, mercury, hexavalent chromium, PBB, or PBDE above the 0.1 wt% threshold. Chill roll matte finishes with roughness Ra between 0.2 µm and 0.8 µm are used when a controlled coefficient of friction is required for downstream form-fill-seal conversion. Air knife supply must be filtered to 5 µm to prevent oil aerosol deposition on the film surface; oil aerosol on the chill roll creates wet-out defects that are visible after metallization or print adhesion testing.
Although a 3.0 g/10 min MFR is lower than typical thin-wall closure grades, MARLEX PP HGX 030SP can be injection molded into thick-wall overcaps, valve caps, and industrial closures when the hot-runner manifold is held at 230°C to 260°C and nozzle tips are sized for shear rates below 40,000 s⁻¹. Processing below 230°C increases melt viscosity enough to create gate-freeze before complete packing, leaving sink marks at thick sections and raising part weight variation across a multicavity tool above 0.5%. The mold temperature is controlled at 20°C to 40°C, and injection pressures on a standard hydraulic machine are typically maintained between 80 MPa and 120 MPa. For a 2 mm wall section, the practical flow length is limited to approximately 150:1; beyond this ratio, short shots occur before the packing phase can compensate for volumetric shrinkage. Hold pressure is applied at 50% to 70% of the peak injection pressure for 8 s to 12 s, and gate dimensions are kept at 60% to 80% of the nominal wall thickness to delay gate freeze. Mold shrinkage of the homopolymer is expected in the 1.2% to 1.8% range under ASTM D955-08, with post-molding crystalline shrinkage occurring for 24 h to 48 h. Parts produced for food-contact caps must comply with FDA 21 CFR 177.1520(c) 1.1; closures used in pharmaceutical overpackaging require verification of extractables under a suitable pharmacopoeial monograph. The grade is not recommended for thin-wall, high-cavitation closures with wall thickness below 0.8 mm because the higher melt viscosity at this MFR demands melt temperatures above 270°C, which accelerates chain degradation and increases odor. Cavity balancing in tools above 8 cavities is critical: imbalance above 5% in fill time across cavities produces dimensional inconsistency and closure torque variation that is measured after 24 h conditioning at 23°C and 50% RH. Hot-runner valve pins should be serviced at intervals not exceeding 500,000 cycles because polypropylene chain fragments and additive residues accumulate around the pin guides and create sticking marks on the gate pad.
Competitive MARLEX PP HGX 030SP prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
MARLEX PP HGX 030SP is a propylene homopolymer injection-molding resin supplied in pellet form. The grade designation places it in the high-flow segment of the Marlex polypropylene portfolio, with a nominal melt flow rate of 30 g/10 min determined in accordance with ASTM D1238 at 230 °C and 2.16 kg. Because the polymer backbone consists of propylene repeat units without deliberate ethylene comonomer addition, the grade exhibits higher crystallinity and stiffness than random copolypropylene resins of similar flow. The low melt viscosity associated with a 30 g/10 min melt flow rate permits rapid filling of thin-wall tools, but it narrows the permitted residence time during plastication and requires disciplined control of screw recovery and hot-runner temperature setpoints.
In production-scale injection molding, MARLEX PP HGX 030SP is commonly processed on reciprocating screw machines with general-purpose polyolefin screws having L/D ratios from 20:1 to 24:1 and compression ratios from 2.5:1 to 3.5:1. The material’s melt viscosity under shear is substantially lower than that of 12 g/10 min polypropylene, reducing injection-pressure demand in multi-cavity hot-runner tools. However, the lower molecular weight also decreases melt strength; gas counterpressure or sequential valve-gate control may be necessary in thick-to-thin transitions. The screw-recovery back pressure is typically held at 2–5 MPa to maintain a stable cushion without over-shearing the melt.
Published setup guidance for MARLEX PP HGX 030SP gives a melt-temperature starting interval of 230–260 °C at the nozzle. The lower boundary is set by short-shot formation and insufficient reproduction of fine surface texture when mold temperature is below 20 °C. The upper boundary is set by thermo-oxidative chain scission of polypropylene; stagnant melt in hot-runner manifolds should not remain above 260 °C for more than 10 min. Mold temperature is normally maintained between 20 °C and 50 °C, with the higher portion of that range used for high-gloss surfaces and lower post-molding shrinkage variation. Injection velocity is profiled to fill the cavity in 0.2–1.5 s depending on wall thickness and flow length. Excessive injection velocity above the shear-thinning plateau can produce jetting, gate blush, and uneven cavity packing in unfilled homopolymer polypropylene.
At the shear rates encountered in thin-wall molding, typically 10²–10⁴ s⁻¹, the apparent viscosity of this melt-flow class falls to the range of 30–50 Pa·s at 230 °C. The power-law index in this window is approximately 0.30–0.40, indicating pronounced pseudoplasticity. Melt temperature above 260 °C lowers viscosity further but accelerates peroxide-initiated radical propagation and β-scission reactions. Consequently, the processing window is best defined by the intersection of melt-pressure availability, cavity fill time, and residence-time limits rather than by a single maximum temperature.
At 23 °C and 50 % relative humidity, the density of MARLEX PP HGX 030SP is approximately 0.905 g/cm³ when tested under ASTM D1505. The semi-crystalline morphology in molded test specimens gives a flexural modulus of approximately 1.5 GPa at 1 % secant strain under ASTM D790. Tensile yield stress is approximately 35 MPa at 50 mm/min crosshead speed under ASTM D638. Elongation at yield is approximately 8 %, reflecting the stiff, crystalline character of the homopolymer. Notched Izod impact resistance at 23 °C is approximately 25–30 J/m under ASTM D256, while the value at 0 °C is substantially lower. Heat deflection temperature at 0.455 MPa is approximately 100–110 °C under ASTM D648; at 1.82 MPa, the value drops to 50–60 °C because the homopolymer softens rapidly near the crystalline α-relaxation region.
After ejection, the linear mold shrinkage of unreinforced homopolymer polypropylene in this flow class is typically 1.0–1.4 % in the flow direction and 1.2–1.6 % in the transverse direction. Shrinkage anisotropy is driven by molecular orientation and crystallite texture. Holding pressure should be applied until gate freeze to compensate for volumetric contraction. If holding pressure is released before gate freeze, sink marks and internal voids develop in rib-to-wall intersections. Post-molding crystallization continues for 24–48 h; dimensional inspection should therefore be delayed until after this period. The coefficient of linear thermal expansion is approximately 80–100 × 10⁻⁶ K⁻¹, which is relevant when the part is assembled with metal inserts or clamped against metal components.
| Property | Test method | Typical value |
|---|---|---|
| Melt flow rate, 230 °C/2.16 kg | ASTM D1238 | 30 g/10 min |
| Density, 23 °C | ASTM D1505 | 0.905 g/cm³ |
| Tensile stress at yield, 50 mm/min | ASTM D638 | 35 MPa |
| Elongation at yield | ASTM D638 | 8 % |
| Flexural modulus, 1 % secant | ASTM D790 | 1,500 MPa |
| Notched Izod impact, 23 °C | ASTM D256 | 27 J/m |
| Heat deflection temperature, 0.455 MPa | ASTM D648 | 105 °C |
| Rockwell hardness, R scale | ASTM D785 | 95 |
The values listed are typical and should not be construed as specification limits; end-use testing under actual processing conditions is required to establish part qualifications. Property retention after molding is influenced by gate size, holding pressure, and mold temperature. Gate dimensions in thin-wall tools should be at least 60 % of the nominal wall thickness to permit adequate packing before gate freeze. The use of valve gates with delayed opening reduces premature gate seal and improves sink-mark control in ribs and bosses.
Mold-filling simulations for MARLEX PP HGX 030SP require a viscosity curve that captures shear-rate dependence. The grade’s high melt flow index alone is insufficient to predict pressure drop in thin-wall tools because the pressure drop is determined by shear viscosity at cavity shear rates rather than by capillary flow at 2.16 kg. Simulation users should request a shear-rate-dependent viscosity data package from the resin supplier. When a full Moldflow or Moldex3D database is unavailable, the power-law approximation in the shear-rate range 10²–10⁴ s⁻¹ may be used for early runner-sizing calculations. The heat capacity of semicrystalline polypropylene is typically 1.8–2.0 J/(g·K), and the transition temperature between melt and solid states is around 165 °C; these values influence cooling-time calculations. Cooling time in injection molding is proportional to the square of wall thickness and depends on the thermal diffusivity of the polymer. For a 1 mm wall, cooling time to ejection is usually 8–15 s at a mold temperature of 30 °C. Thicker walls require longer cooling; thin walls can be ejected earlier if the crystallized skin has developed sufficient modulus.
Compared with a 12 g/10 min homopolymer grade from the same family, MARLEX PP HGX 030SP delivers lower melt viscosity at a given shear rate, which lowers injection pressure and permits longer flow lengths or thinner nominal walls in the range of 0.4–1.2 mm. The trade-off is a measurable reduction in tensile yield strength and low-temperature impact resistance because the lower molecular weight reduces chain-enmeshment density and tie-molecule concentration across lamellar boundaries. In comparative evaluations of similarly molded tensile bars under ASTM D638, a 30 g/10 min grade can exhibit yield stress 5–10 % lower than a 12 g/10 min homopolymer of equivalent density. The process benefit is often decisive in high-cavitation closures, thin-wall food containers, and appliance housings where the hydraulic pressure ceiling of the molding machine and the filling-time target are governing constraints.
Flow-length-to-thickness ratios greater than 200:1 are achievable with 30 g/10 min homopolymer polypropylene when melt temperature is held at 250 °C and cavity thickness is above 0.8 mm, but published data for this specific configuration is limited. Molding trials should map the short-shot boundary with increasing hold pressure and the flash boundary with decreasing clamp force. Such trials identify the allowable melt-temperature interval under the actual hot-runner balance of the tool.
Across the broader polypropylene spectrum, the homopolymer architecture of MARLEX PP HGX 030SP provides higher flexural modulus and heat deflection temperature than random copolymers with equivalent melt flow, but it lacks the subambient impact resistance of propylene-ethylene impact copolymers. A homopolymer notched Izod impact at 23 °C typically falls near 27 J/m under ASTM D256, whereas an impact copolymer of similar flow may exceed 100 J/m at 0 °C. For transparent or contact-clarity applications, a random copolymer is preferred because homopolymer polypropylene crystallizes into large spherulites that scatter visible light. For parts exposed to repeated flexure or subambient impact, the use of an impact copolymer or an elastomer-modified compound is preferred; the homopolymer grade is not optimized for these conditions.
In closure manufacturing, the low melt viscosity of MARLEX PP HGX 030SP supports filling of long tamper-evident bands and thin bridge-thread geometries. Continuous torque and removal torque of molded closures are frequently evaluated according to ASTM D3198, although end-use closure performance depends also on bottle finish dimensions, top-load stiffness, and liner compression. For high-stack-load containers, the grade’s high flexural modulus contributes to sidewall rigidity, but the part design must compensate for the homopolymer’s lower impact toughness at refrigerator temperatures.
Polyolefins are only weakly hygroscopic, but pellet surface moisture from ambient condensation can introduce splay and silver streaking in molded parts. For MARLEX PP HGX 030SP, pre-drying at 80 °C for 2–4 h in a desiccant hopper dryer is recommended when bulk storage humidity exceeds 60 % RH or when visible surface moisture is observed. Inline moisture above 0.1 % can produce overbubbling at the vent and intermittent nozzle drool. Regrind addition is generally limited to 20–30 wt% for appearance-critical parts; higher regrind fractions reduce melt viscosity stability and increase black speck formation after repeated thermal histories. Additive depletion during recycling—particularly hindered phenolic antioxidants and acid scavengers—typically limits reprocessing to three cycles unless a top-up stabilization package is used.
Dry blending with copper-containing pigments should be evaluated separately because copper ions catalyze hydroperoxide decomposition and accelerate polypropylene chain scission. The material should not be combined with halogenated flame retardant packages that require antimony trioxide without assessing acid-generation effects on mold and hot-runner surfaces.
From a regulatory perspective, polypropylene homopolymers are commonly evaluated for food-contact use under FDA 21 CFR 177.1520; finished-article compliance requires migration testing under the intended temperature and food simulant. For electrical and electronic goods, the additive package is typically assessed against RoHS Directive 2011/65/EU, specifically the restricted substances lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. Processing sites handling MARLEX PP HGX 030SP for medical packaging should confirm ISO 10993 suitability with the resin supplier, because homopolymer polypropylene is not inherently classified for long-term implant use.
