| HS Code | 431753 |
| Density | 0.91 g/cm³ |
| Melt Flow Rate | 15 g/10 min (230°C, 2.16 kg) |
| Tensile Strength At Yield | 20 MPa |
| Elongation At Break | 400% |
| Flexural Modulus | 900 MPa |
| Izod Impact Notched At 23 C | 500 J/m |
| Izod Impact Notched At 30 C | 80 J/m |
| Heat Deflection Temperature | 95°C (0.45 MPa) |
| Rockwell Hardness | R60 |
| Vicat Softening Point | 130°C |
As an accredited HiPrene PP Compound HLG75B factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | HiPrene PP Compound HLG75B is supplied in 25 kg bags, with packaging designed to protect against moisture and contamination. |
| Container Loading (20′ FCL) | 20′ FCL container loading of HiPrene PP Compound HLG75B, packed in sealed bags on pallets, secured for safe transport. |
| Shipping | HiPrene PP Compound HLG75B is supplied in sealed moisture-resistant bags or bulk containers, shipped via truck, rail, or sea freight. It is non-hazardous under normal transport conditions, but should be kept dry, away from direct heat and ignition sources. Standard handling and ventilation apply to avoid dust accumulation. |
| Storage | Store HiPrene PP Compound HLG75B in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep original containers tightly sealed to prevent moisture absorption and contamination. Maintain ambient temperature and avoid excessive humidity. No special storage requirements beyond standard polymer handling; ensure good housekeeping and proper labeling. |
| Shelf Life | Store in cool, dry conditions away from direct sunlight. Shelf life is 12 months from manufacture date when unopened. |
On production-scale twin-screw extrusion systems with L/D 40:1 and compression ratio 2.5:1, HiPrene PP Compound HLG75B is prepared for automotive door module carriers at melt temperatures from 190°C at the feed throat to 230°C at the nozzle, with mold temperature held between 30°C and 50°C. When ambient relative humidity exceeds 60%, the compound is pre-dried in a desiccant dryer at 80°C for 2 h to prevent surface splay in hot-runner tooling. Weld-line integrity in latch bosses and speaker apertures is characterized by ISO 179-1/1eA notched Charpy impact after conditioning at 23°C and 50% RH for 48 h; acceptance thresholds for injection molded PP carriers in this melt flow class typically require values above 8 kJ/m² at 23°C and above 3 kJ/m² at -20°C. VDA 278 hydrocarbon emission testing is used for cabin air quality; if the molded part must pass OEM limits of 100 µg/g total volatile organic compounds, processing must avoid barrel residence times above 10 min and hot-runner dead zones. Sequential valve gating at two locations shifts the failure location from the weld line to the parent material, and published data for this specific configuration remains limited beyond the stated acceptance envelope.
Thin-wall front panels for washing machines and dishwashers molded from HLG75B at nominal wall thickness 2.5 mm exhibit sink-mark depth variation up to 0.3 mm when the gate freezes before completion of crystalline shrinkage. The process window is evaluated on a 1,800-kN hydraulic injection molding machine with screw diameter 50 mm, using holding pressure from 70 MPa to 90 MPa for 6 s to 10 s. Mold surface temperature is maintained at 35°C to 45°C with turbulent water flow at Reynolds number above 10,000. Gate diameters below 1.2 mm are avoided because early gate freeze produces voids behind bosses. Rib-to-wall thickness ratio is kept at 0.5:1 to 0.6:1, and rib heights above 6 mm are cored from the back side to reduce mass. Flexural modulus is tested under ISO 178 at 2 mm/min; values in the range 1,800 MPa to 2,200 MPa are typical for halogen-free PP appliance compounds in this class. Gloss measured at 60° according to ISO 2813 is controlled by mold surface finishing and by avoiding shear rates above 60,000 s⁻¹ at the nozzle. A cold runner system with reverse-tapered sprue is used to avoid stringing in fast-cycling operations.
| Parameter | Door module carrier | Appliance front panel | Returnable logistics crate |
|---|---|---|---|
| Melt temperature | 220°C–240°C | 210°C–230°C | 200°C–230°C |
| Mold temperature | 30°C–50°C | 35°C–45°C | 20°C–35°C |
| Holding pressure | 60 MPa–80 MPa | 70 MPa–90 MPa | 50 MPa–70 MPa |
| Typical cycle | 40 s–60 s | 35 s–50 s | 45 s–70 s |
| Back pressure | 6 bar–10 bar | 8 bar–12 bar | 5 bar–8 bar |
Clamp force validation on a 1,250-kN injection molding machine with tie-bar spacing 900 mm has demonstrated that returnable logistics crates molded from HLG75B maintain flatness within 5 mm over a 600 mm span when the base panel is gated centrally. The compound is processed at melt temperature 210°C and mold temperature 25°C, with cooling time of 25 s for a 3.2 mm nominal wall. Low-temperature impact behavior is assessed under ISO 179-1/1eA; for returnable packaging, a typical acceptance criterion is no complete break at -20°C with energy below 4 J. Stack load rating is verified according to ISO 8611-1 using a nominal payload of 250 kg per pallet with a safety factor of 1.5. Cycle-time expansion is observed when the melt cushion drops below 3 mm; the resulting sink depth on the pallet underside exceeds 0.4 mm. Mold-flow simulation indicates that two injection points reduce fill pressure by 12% and improve weld-line position in the forklift entry zone. Multiple use under outdoor exposure requires UV stabilization; 0.3 wt% of a hindered amine light stabilizer masterbatch is added on the production extruder, and QUV accelerated weathering under ASTM G154 is run for 1,000 h to verify tensile strength retention above 85%.
In lead-acid battery container and lid production, HLG75B is injection molded with wall thickness from 2.0 mm to 2.8 mm. Acid resistance is assessed by immersion in 30% sulfuric acid at 60°C for 500 h, followed by tensile strength retention above 90% under ISO 527-2. The lid-to-container joint is formed by hot plate welding at platen temperature 230°C to 260°C and welding displacement 1.0 mm to 1.5 mm; burst pressure testing according to IEC 60095-1 usually requires a minimum of 2.0 bar for batteries in stationary service. Weld strength is influenced by melt film thickness and by residual mold release agent on the sealing faces; silicone-based external release agents are avoided because they reduce weld strength below 80% of parent wall strength. Thermal cycling from -20°C to 60°C at 12 h per cycle for 100 cycles is used to detect crack propagation at container corners. When molded parts are ejected at surface temperature above 80°C, post-mold shrinkage in the bushing area can exceed 0.8%, causing terminal insert loosening. In black compounds, carbon black dispersion is checked on a 10 µm microtome slice; agglomerates above 50 µm are rejected because they act as crack initiators.
UL 94 HB classification at 1.5 mm wall thickness is routinely assessed after 48 h conditioning at 23°C and 50% RH for electrical switchgear and consumer distribution enclosures molded from HLG75B. The compound is processed at melt temperature 220°C; screw speed is limited to 80 min⁻¹ on a 40 mm screw to avoid overheating. Brass thread inserts are placed by insert molding or by thermal insertion at 180°C to 220°C; pull-out force is evaluated after 500 h heat aging at 100°C for tapped bosses, with loosening torque above 0.8 Nm typically required for MCB carriers. Glow wire testing under IEC 60695-2-11 at 650°C for 30 s is applied to uninsulated live parts; PP compounds without flame retardant may pass glow wire ignition but not beyond 750°C. The creepage path design must account for comparative tracking index measured under IEC 60112; PP compounds in this class usually fall in the 400 V to 600 V class, and open air gaps below 2.5 mm are not used in uncoated designs. Mold deposit formation on cavity surfaces is controlled with tool steel of 52 HRC and minimized by excluding zinc stearate levels above 0.1 wt%.
| Test standard | Condition | Measured property | Application context |
|---|---|---|---|
| ISO 527-2 | 50 mm/min, 23°C | Tensile strength and elongation at break | Battery container material after acid aging |
| ISO 179-1/1eA | 23°C and -20°C | Notched Charpy impact strength | Automotive door module carrier and logistics crate |
| ISO 178 | 2 mm/min | Flexural modulus | Appliance front panel rib deformation |
| ISO 188 | 100°C, 1,000 h | Heat aging tensile retention | HVAC condensate drain pan |
| IEC 60695-2-11 | 650°C, 30 s | Glow wire resistance | Electrical switchgear enclosure |
| ASTM G154 | Cycle 8 h UV at 60°C, 4 h condensation at 50°C | Weathering retention | Outdoor returnable pallet |
| VDA 278 | Thermal desorption 90°C for 30 min | VOC and fogging emissions | Automotive interior carrier |
Condensate drain pans in commercial air-handling units are converted from stamped steel to HLG75B when condensate pH is expected to drop below 5.5 due to dissolved carbon dioxide. The part is molded with wall thickness 3.0 mm to 4.0 mm, and the draft angle on vertical walls is held above 1.5°. Long-term heat aging is tested under ISO 188 at 100°C for 1,000 h; tensile strength retention above 75% of original value is used as acceptance. A condensate exposure test is performed with 5% sodium chloride solution at 60°C for 30 days to evaluate stress cracking in corner radii; radii below 2.0 mm are avoided at the bottom corners. The molded pan is designed with six mounting bosses, each requiring a pull-out force above 1.2 kN when tested with M6 self-tapping screws under ISO 19233. Distortion after heating at 90°C for 24 h must remain below 0.5% of the overall length. Because the compound is susceptible to copper-catalyzed oxidation, direct contact with copper tubes or copper-containing biocides in drain lines is prevented; passivated copper is specified when mixed-metal contact cannot be avoided. The production tool uses a centrally located fan gate with a flash trap; short shots occur at melt temperatures below 200°C when the flow length exceeds 800 mm at 3.5 mm wall thickness.
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HiPrene PP Compound HLG75B is supplied as a black, mineral-reinforced polypropylene injection-moulding compound with a controlled melt-mass-flow range and a stabilizer system intended for short-cycle technical parts. The product is supplied in cylindrical pellets of 3–4 mm diameter, packed in 25 kg moisture-barrier bags; the suffix B denotes black pellet production. Under the supplier’s certificate of analysis, melt-flow index is held to 20–30 g/10 min at 230 °C and 2.16 kg to ISO 1133-1. The mineral reinforcement raises flexural modulus and reduces mould shrinkage relative to unfilled polypropylene, while the elevated flow range may permit fill of thin-wall sections; actual fill capability must be confirmed by mould filling simulation and short-shot study. The material is opaque and is not suitable for living-hinge or translucent packaging use because elongation at break is reduced and light transmission is negligible.
| Property | Standard | Condition | Nominal range |
|---|---|---|---|
| Density | ISO 1183-1 | 23 °C | 1.05–1.08 g/cm³ |
| Melt mass-flow rate | ISO 1133-1 | 230 °C, 2.16 kg | 20–30 g/10 min |
| Tensile stress at yield | ISO 527-2 | 50 mm/min | 25–30 MPa |
| Tensile strain at yield | ISO 527-2 | 50 mm/min | 3.0–4.5% |
| Flexural modulus | ISO 178 | 2 mm/min | 2300–2600 MPa |
| Notched Charpy impact | ISO 179-1/1eA | 23 °C | 4.0–6.0 kJ/m² |
| Notched Charpy impact | ISO 179-1/1eA | −20 °C | 2.0–3.0 kJ/m² |
| Heat deflection temperature B | ISO 75-2/B | 0.45 MPa | 95–105 °C |
| Heat deflection temperature A | ISO 75-2/A | 1.8 MPa | 60–70 °C |
| Vicat softening point | ISO 306/A50 | 10 N | 145–152 °C |
| Mould shrinkage parallel | ISO 294-4 | 60×60×2 mm | 0.8–1.0% |
| Mould shrinkage perpendicular | ISO 294-4 | 60×60×2 mm | 1.0–1.2% |
| Water absorption | ISO 62 | 24 h, 23 °C | 0.02–0.05% |
| Flammability | UL 94 | 1.5 mm | HB |
Drying is mandatory only after storage outside sealed packaging or at relative humidity above 60%. Pellet surface moisture should be removed in a desiccant dryer with inlet dew point not higher than −30 °C, air temperature 80 °C, and residence time 2–4 h. The feed throat temperature should be 40–60 °C to prevent condensation without causing premature pellet softening. Closed-loop desiccant-wheel units are preferred over hot-air hopper dryers because prolonged exposure above 100 °C can drive off stabilizer additives and cause yellowing or brown streaking.
Injection-moulding conversion on clamp force 800–3,000 kN machines should use a general-purpose polyolefin screw with L/D 20:1–24:1, compression ratio 2.5:1–3.0:1, and a check-ring clearance not exceeding 0.05 mm. Barrel set temperatures of 200/210/220/230/230 °C from feed to nozzle maintain melt temperature at 210–250 °C when measured by infrared pyrometer at the nozzle. Screw speed should be 60–80 rpm for a 40 mm screw and scaled inversely with diameter to keep peripheral speed below 0.4 m/s; back pressure 3–8 bar improves filler wetting, but above 10 bar can over-shear the melt and increase the effective MFR above the specified upper limit. At melt temperatures above 260 °C, unused residence time should not exceed 5 min. Production interruptions longer than 30 min require purging with cast acrylic or a high-MFR polypropylene purge compound.
Mould-surface temperature should be maintained between 20 °C and 60 °C. The lower range reduces cycle time and post-mould shrinkage, but weld-line strength and surface gloss may decline. The higher range improves melt-front merging and replication of textured surfaces but increases cycle time and may increase sink marks in thick bosses. For parts with wall stock 2.0–3.0 mm, injection velocity of 60–120 mm/s measured at screw advance is typical; packing pressure should be 60–80% of peak fill pressure for 4–8 s, depending on gate freeze-off. Edge or fan gates of 1.0–1.5 mm thickness are recommended; pin gates below 0.8 mm can produce shear-induced splay and gate blush. Vent depths of 0.02–0.03 mm are required to prevent burn marks from volatiles.
Process defects observed on production-scale lines with this filler system include black specks from stagnant melt in damaged screw tips, uneven gloss from low mould temperature, and post-ejection warpage caused by differential shrinkage between parallel and perpendicular directions. Differential shrinkage measured on 60×60×2 mm plaques to ISO 294-4 is 0.2–0.4%. Ribs and bosses should be designed with a thickness not exceeding 50% of adjacent wall stock to limit sink. Packing time should be increased in increments of 1 s until part weight no longer increases, rather than relying solely on hold pressure, because the mineral filler accelerates gate freeze-off relative to unfilled PP. Incoming inspection should verify MFR by ISO 1133-1 and ash content by ISO 1172. Batch-to-batch MFR variation of more than ±2 g/10 min can alter peak injection pressure and part weight; ash content variation above ±0.5 wt% can shift flexural modulus measured by ISO 178 by more than 100 MPa.
For automotive interior lower trim and HVAC components, the primary acceptance tests are low-temperature impact, heat resistance, and emissions. Notched Charpy impact at −20 °C is 2.0–3.0 kJ/m² to ISO 179-1/1eA, which indicates that notched sections can transit brittle; therefore snap-fit hooks should be radiused to at least 0.5 mm and located away from weld lines. Heat deflection temperature under 0.45 MPa is 95–105 °C to ISO 75-2/B, but the material should not be specified for continuous structural load above 80–90 °C in thick parts with internal stress. Emissions performance under VDA 277 or ISO 12219-2 is determined by the stabilizer and masterbatch package. Published data for this specific configuration is limited, and moulded parts should be validated on production tools because regrind content above 20 wt% can increase volatile organic compound release.
For electrical junction boxes and appliance housings, flammability classification is UL 94 HB at 1.5 mm. The grade is not flame-retardant; applications requiring V-2 or V-0 ratings, glow-wire resistance to IEC 60695-2-11, or comparative tracking index above 600 V require an FR-modified polyolefin or engineering resin. Surface leakage performance should be assessed by IEC 60112 on textured production plaques, because mould texture can reduce tracking resistance. When used in appliance housings, the compound has resistance to typical domestic cleaning agents; immersion testing under ISO 175 for 24 h at 23 °C is recommended when exposure to mineral acids, alcohols, or ketones is expected.
| Property and standard | HLG75B | Unfilled PP homopolymer | 20% talc-filled PP | 30% short-glass PP |
|---|---|---|---|---|
| Density ISO 1183-1 | 1.05–1.08 g/cm³ | 0.90–0.91 g/cm³ | 1.04–1.06 g/cm³ | 1.10–1.14 g/cm³ |
| Flexural modulus ISO 178 | 2300–2600 MPa | 1300–1600 MPa | 2200–2600 MPa | 4000–5500 MPa |
| Tensile stress at yield ISO 527-2 | 25–30 MPa | 30–35 MPa | 26–30 MPa | 70–90 MPa |
| Notched Charpy impact ISO 179-1/1eA, 23 °C | 4.0–6.0 kJ/m² | 2.5–4.0 kJ/m² | 3.0–5.0 kJ/m² | 6.0–10.0 kJ/m² |
| Mould shrinkage parallel ISO 294-4 | 0.8–1.0% | 1.2–2.0% | 0.8–1.1% | 0.2–0.5% |
| HDT B ISO 75-2/B | 95–105 °C | 85–95 °C | 100–110 °C | 130–150 °C |
| Gloss 60° ASTM D523 | 40–55 GU | 70–85 GU | 30–45 GU | 15–30 GU |
Against unfilled PP homopolymer, HLG75B raises flexural modulus by approximately 800–1000 MPa and reduces parallel mould shrinkage from 1.2–2.0% to 0.8–1.0%. However, tensile strain at yield drops from 8–12% for unfilled homopolymer to 3.0–4.5%, which excludes living-hinge designs and snap-fit assemblies with high deflection.
Against 20 wt% talc-filled PP, HLG75B overlaps in stiffness and shrinkage; the differentiating variable is controlled flow. With MFR 20–30 g/10 min, HLG75B can fill thinner walls and can be processed at 10–20 °C lower melt temperature than lower-flow talc grades, but this benefit must be verified by spiral-flow or short-shot testing because filler orientation and gate design alter flow length.
Against 30 wt% short-glass PP, HLG75B has lower tensile strength and flexural modulus but lower warpage and better surface finish. Glass fibres orient preferentially in the flow direction and create anisotropic shrinkage. HLG75B shows differential shrinkage of 0.2–0.4% between flow and cross-flow directions, while glass-filled grades can show 0.3–0.7% or more in unfavourable gating. Therefore HLG75B is preferred for flat covers and appearance parts; glass-filled PP is preferred for structural brackets and under-the-hood supports requiring tensile strength above 50 MPa.
Compared with ABS, HLG75B has lower HDT A under 1.8 MPa, at 60–70 °C, versus 85–100 °C for general-purpose ABS, and lower notched impact, at 4.0–6.0 kJ/m² Charpy at 23 °C, versus 15–30 kJ/m² Izod for many ABS grades. HLG75B provides broader resistance to aqueous acids, alkalis, and polar solvents and is less moisture-sensitive during processing. Because the untreated polypropylene surface energy is typically below 30 mN/m measured by ISO 19403-2, flame, plasma, or primer treatment is required before painting or bonding.
Long-term heat ageing data for this specific configuration is limited. Validation under ISO 188 at 100 °C and 120 °C for 500–1000 h should be performed on production plaques before committing parts exposed to continuous service above 80 °C. The stabilizer package is intended to protect melt processing and intermittent heat exposure, not sustained hot-oil or hot-air environments. Thermal oxidative failure manifests as surface crazing and reduction in tensile elongation; tensile elongation at yield should remain above 2.0% after ageing for acceptance in non-structural interior parts.
Outdoor weathering resistance is limited unless an additional UV package is selected. Exposure to ISO 4892-2 cycle 1 may produce gloss reduction and chalking. Carbon black in the B suffix grade provides some surface screening, but the compound should not be specified for unpainted exterior trim beyond 12 months of direct weathering without field validation. If painted or bonded, adhesion should be tested under ISO 2409 or ISO 4624 after pretreatment.
Copper-based pigments and manganese stearate should be avoided, because transition metal ions can catalyse thermo-oxidative degradation. If colour concentrates are added, the carrier resin should have MFR within 10 g/10 min of the base compound and let-down ratio should not exceed 4 wt%. Regrind usage should be limited to 20 wt% in visible parts and 30 wt% in non-visible parts if the regrind is dry, free of fines, and generated from the same production lot; higher regrind fraction can increase black speck formation and lower notched impact by 0.5–1.0 kJ/m².
Not intended for food-contact or medical use unless a separate grade with EU 10/2011 or USP Class VI is specified and validated. The standard grade is supplied with compliance to RoHS and REACH as declared on the safety data sheet; finished-part compliance requires assessment of all added pigments, processing aids, and regrind sources.
