| HS Code | 417530 |
| Product | Scolefin 42 G 25 PP Copolymer |
| Material Type | Polypropylene (PP) Copolymer |
| Glass Fiber Content | 25% |
| Density | 1.04 g/cm³ |
| Melt Flow Rate | 3.5 g/10 min at 230°C/2.16 kg |
| Tensile Strength | 57 MPa |
| Flexural Modulus | 5900 MPa |
| Charpy Impact Strength Notched 23 C | 9 kJ/m² |
| Charpy Impact Strength Unnotched 23 C | 30 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 158°C |
| Heat Deflection Temperature 1 8 Mpa | 120°C |
| Melting Point | 164°C |
| Mold Shrinkage | 0.3% to 0.6% |
As an accredited Scolefin 42 G 25 PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Scolefin 42 G 25 PP Copolymer is supplied in 25 kg moisture-proof polyethylene-lined woven polypropylene bags, palletized and wrapped. |
| Container Loading (20′ FCL) | 20′ FCL loading: Scolefin 42 G 25 PP Copolymer packed in 25 kg bags, palletized and shrink-wrapped for safe transport. |
| Shipping | Scolefin 42 G 25 PP Copolymer ships as non-hazardous plastic granules, not regulated under IMDG, ADR, or IATA. Pack in clean, dry, sealed containers to prevent contamination and moisture absorption. Store away from heat and ignition sources. Standard dry van or container transport is suitable. |
| Storage | Store Scolefin 42 G 25 PP Copolymer in a clean, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture contamination and dust accumulation. Maintain moderate temperatures and avoid prolonged exposure to UV radiation. Follow first-in, first-out rotation and store separately from oxidizing agents. |
| Shelf Life | Shelf life is typically 2 years from production date when stored in original, unopened packaging under dry, cool conditions. |
On hot-runner injection molding cells producing monolayer food containers at wall thicknesses below 0.45 mm, the interaction between melt residence time and screw recovery time determines the minimum sustainable cycle time. Scolefin 42 G 25 PP Copolymer is processed in that environment as a melt-flow-controlled material with nominal melt flow rate of 25 g/10 min under ISO 1133-1:2022 at 230 °C/2.16 kg. Typical barrel temperatures from feed to nozzle are maintained at 210–240 °C, hot runner manifolds at 220–250 °C, and mold cooling circuits at 15–40 °C. Shorter residence times below 90 s preserve molecular weight distribution; longer residence times above 5 min at the upper temperature boundary produce surface tiger-stripe defects on high-gloss lids, requiring a reduction in back pressure from 8–12 MPa to 4–6 MPa on all-electric clamp systems. Formulation addition ratio in monolayer food-contact packaging is typically 100 parts by weight virgin pellets with 2–4 parts color or white masterbatch added via gravimetric dosing at the feed throat; closed-loop regrind incorporation is limited to 10–20 parts when the recycled fraction is generated from off-spec articles and the target food type allows re-use under documented process control. Downstream production process uses high-speed hydraulic or all-electric injection molding machines with clamp force between 1,500 kN and 4,500 kN, screw L/D ratio 20:1–24:1, injection velocities of 150–250 mm/s, and pack pressure of 30–60 MPa. Terminal finished product types include dairy tubs, microwaveable polypropylene trays, deli containers, disposable thin-wall cups, and matching lids where sidewall flexural modulus and top-load strength are controlled by pack time rather than cavity pressure alone. Compliance scope for finished food-contact articles is limited by the framework in the matrix below; raw pellet certification alone is not sufficient for the final declaration.
| Compliance framework | Standard designation | Test or parameter | Application condition |
|---|---|---|---|
| United States food contact | FDA 21 CFR 177.1520(c) | Olefin polymer specification | Monolayer rigid PP containers |
| European food contact | EU No 10/2011 | Overall migration, EN 1186 series, 10 mg/dm² | Aqueous, acidic, fatty food simulants |
| China food contact | GB 4806.7-2023 | Total migration, consumption of potassium permanganate | Export PP packaging |
Automotive interior substrate compounding with propylene copolymers centers on the ductile-to-brittle transition that appears when talc content exceeds 18–22 wt% in unfilled elastomer-lean formulations. Scolefin 42 G 25 PP Copolymer is therefore dosed as the base resin at 100 parts by weight, with talc at 20–28 parts, ethylene-octene or ethylene-propylene impact modifier at 12–20 parts, and stabilizer package at 0.5–1.0 parts. Below 20 parts talc, heat distortion temperature under 0.45 MPa remains insufficient for dark-colored upper deck parts in tropical sun load; above 28 parts, Charpy notched impact strength at −20 °C declines, producing failure at gate weld lines during side curtain airbag deployment simulations. Industry compliance standards applied to production compounds include ISO 3795 or FMVSS 302 burn-rate testing below 100 mm/min, VDA 277 total VOC emission, VDA 278 volatile and semi-volatile fractions, REACH Regulation (EC) No 1907/2006, and GADSL declarable substance screening. Downstream production process uses co-rotating twin-screw extruders with L/D ratio 40:1–48:1, processing melt temperatures between 190–230 °C, screw speeds 450–700 rpm, and side-feeding of talc after polymer softening to avoid screw wear. The compounds are then injection-molded on machines with clamp force of 6,500–12,000 kN and mold temperatures of 30–60 °C. Terminal finished product types are lower door trim panels, B-pillar lower covers, glove boxes, center console substrates, and seat back panels.
High-flow propylene copolymers reduce injection pressure and cycle time in multi-cavity cap production, but lower molecular weight fractions can reduce environmental stress cracking resistance in contact with fats if used in stressed tamper-evident hinges. In production trials on multi-cavity closure molds with 48–96 cavities, the limiting failure mode at wall thicknesses of 0.6–1.2 mm is not stress cracking but ovalization and score-line misalignment when demolding occurs above a mold temperature of 25–35 °C. Formulation addition ratio for Scolefin 42 G 25 PP Copolymer in cap and closure production is 100 parts by weight base resin with slip and antistatic masterbatch at 2–4 parts to control cap release torque. Compliance scope includes EU No 10/2011 for dairy and fat simulants, FDA 21 CFR 177.1520(c), and ISO 8317:2015 only when child-resistant certification is required. Downstream production process uses high-speed injection molding machines with clamp force of 1,800–3,000 kN, screw L/D ratio 22:1–25:1, melt temperature 220–245 °C, mold cooling at 10–30 °C, and cycle times between 4–8 s. Terminal finished product types include beverage closures, dairy neck rings, condiment caps, and tamper-evident sports closures.
Small appliance housings combine live-part clearance requirements from IEC 60335-1:2020 with snap-fit geometries requiring flexural modulus retention under ISO 178 after two hours at 100 °C. Scolefin 42 G 25 PP Copolymer is injection-molded unreinforced or lightly filled at 5–12 parts talc per 100 parts base resin to maintain dimensional mismatch below 0.15 mm across a 300 mm housing span. Compliance scope comprises IEC 60335-1:2020 with creepage and clearance values defined by pollution degree 2 and material group classification, UL 94 rating HB or V-2 as required by the end product, RoHS Directive 2011/65/EU hazardous substance restrictions, and REACH Annex XVII. Formulation addition ratio is 100 parts base resin, 5–12 parts talc when dimensional stability is required, 1–3 parts color masterbatch, and 0.2–0.5 parts phenolic antioxidant; glass fiber is not used in this geometry because it increases warpage anisotropy beyond the acceptance threshold. Downstream production process uses conventional hydraulic or electric injection molding machines with clamp force 2,500–8,000 kN, melt temperature 220–250 °C, mold temperature 30–50 °C, and holding pressure 35–55 MPa. Terminal finished product types include vacuum cleaner housings, coffee machine internal brackets, robot vacuum bumpers, and hand-held garment steamer shells.
Within low-acuity diagnostic device enclosure programs, the use of a 25 g/10 min propylene copolymer reduces melt pressure drop in multi-cavity cold runner molds but introduces lot-to-lot viscosity drift that must be controlled by injection velocity profiling on electric molding cells. Scolefin 42 G 25 PP Copolymer is applied at 100 parts by weight virgin pellets in dust-controlled production; color masterbatch loading is limited to 1–3 parts and regrind is excluded unless validated under ISO 13485:2016 change control. Compliance scope includes ISO 10993-1:2018 evaluation of cytotoxicity, sensitization, and irritation for patient-touching housings, ISO 13485:2016 quality management, FDA 21 CFR Part 820 design controls, and REACH candidate-list verification at article level. Downstream production process runs on all-electric injection molding machines with clamp force of 1,200–3,000 kN, melt temperature 200–230 °C, mold temperature 30–50 °C, and screw L/D ratio 20:1–22:1 to minimize residence-time degradation. Terminal finished product types are portable diagnostic housings, laboratory analyzer covers, point-of-care device enclosures, and non-sterile sample-prep device bodies. If patient-contact certification beyond low-risk external housing is required, the supplier must provide grade-specific biological examination, as published data for this specific configuration is often limited to material datasheet statements.
Surface resistivity below 109 Ω on injection-molded polypropylene trays is achieved only when conductive carbon black is dispersed as a continuous network; simple dry-blend addition produces high quadrant-to-quadrant variation and should not be specified for ESD-sensitive component transport. Scolefin 42 G 25 PP Copolymer is compounded with 100 parts by weight base resin, 8–15 parts conductive carbon black, and 2–5 parts compatibilizer to balance melt flow and surface resistance. Compliance scope includes IEC 61340-5-1:2016, ANSI/ESD S20.20-2021, and EN 61340-5-1:2016 for protective packaging resistance limits; the finished tray surface is tested at 12 % relative humidity and 23 °C using electrodes per IEC 61340-2-3:2016. Downstream production process uses co-rotating twin-screw extrusion at 200–230 °C followed by injection molding on machines with clamp force 2,000–4,000 kN, mold temperature 30–50 °C, and injection speed 80–150 mm/s to minimize conductive network breakup. Terminal finished product types include ESD totes, component trays, PCB handling trays, and module carriers for display assembly.
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Scolefin 42 G 25 is identified as a 25% glass fibre reinforced polypropylene copolymer compound supplied in pellet form for injection moulding. The designation “42 G 25” is a manufacturer trade code, not an ISO or ASTM grade definition; the G 25 suffix is understood within producer nomenclature as a nominal 25% by mass glass fibre loading in a polypropylene copolymer matrix. Incoming material acceptance for this class normally covers density according to ISO 1183-1, melt volume-flow rate according to ISO 1133-1 at 230 °C with 2.16 kg, and filler content by ISO 3451-1 ashing. Commercial 25% glass fibre PP copolymer compounds typically show density between 1.03 g/cm³ and 1.07 g/cm³; ash values after correction for glass sizing and pigment residues commonly fall between 22% and 28%. None of these class ranges substitutes for the supplier certificate of analysis for a specific lot.
Characterization of the dry-as-moulded product takes place at 23 °C and 50% relative humidity. Tensile modulus and tensile stress at break under ISO 527-2 for 25% glass fibre reinforced PP copolymer grades are reported in class data as 4,500 MPa to 6,000 MPa and 65 MPa to 80 MPa. Flexural modulus under ISO 178 falls between 4,000 MPa and 5,500 MPa. Charpy notched impact strength under ISO 179-1/1eA typically spans 8 kJ/m² to 12 kJ/m² at 23 °C, while at −20 °C the value may fall below 4 kJ/m². Heat deflection temperature under ISO 75-2 Method B at 1.8 MPa is generally 130 °C to 150 °C. Mould shrinkage under ISO 294-4 is anisotropic: 0.2% to 0.4% parallel to flow and 0.5% to 0.8% transverse. Because glass fibre length distribution is the primary source of batch-to-batch mechanical variation, an incoming lot that differs from the approved baseline by more than ±8% in tensile modulus should be examined by ISO 3451-1 ashing and optical microscopy for fibre length. Where North American specifications are required, ASTM D638-14 Type I and ASTM D790-17 bars should be used; results from ISO and ASTM flexural tests are not interchangeable because of different span-to-thickness ratios and test speeds.
Short glass fibre increases apparent viscosity at low shear rates but produces pronounced shear thinning above 1,000 s⁻¹; therefore, the filled material may require only slightly higher injection pressure than a highly viscous unfilled PP copolymer. On screw injection units with 40 mm to 60 mm screw diameter and clamp force from 800 kN to 2,500 kN, a starting melt temperature of 230 °C to 250 °C is used, with the rear barrel zone at 210 °C to 220 °C, the mid zone at 230 °C to 240 °C, the front zone at 240 °C to 250 °C, and the nozzle at 230 °C to 240 °C. Mould temperature is maintained from 30 °C to 60 °C; higher settings improve surface quality but prolong cooling time by 8% to 15%. Injection pressure measured at the melt is typically 80 MPa to 120 MPa, with holding pressure at 60% to 80% of injection pressure and back pressure at 0.5 MPa to 1.5 MPa.
Machine wear is the limiting operational boundary. Glass fibre reinforced PP compounds abrade nitrided steel screw flights more aggressively than unfilled and mineral-filled PP. The screw should be specified with a bimetallic barrel and an abrasion-resistant screw having surface hardness of at least 55 HRC; check rings, nozzle tips, and shut-off seats require tungsten carbide or equivalent wear-resistant coatings. Mixing screws with a compression ratio of 2.0:1 to 2.8:1 and L/D of 20:1 to 25:1 are suitable; high-shear mixing sections should be avoided where fibre-length retention is critical.
Drying is not required solely because of polypropylene hydrolysis, but glass sizing can adsorb moisture. If material has been exposed to relative humidity above 60% for more than 24 h or moisture content exceeds 0.1% by weight, pre-drying at 80 °C for 2 h is recommended. Insufficient drying produces silver streaks, weld-line porosity, and variable inter-batch tensile strength.
In extrusion compounding and regrind recovery, the melt filtration requirement is stricter than for unfilled PP. A screen pack with 100/80/60 mesh layers is normally sufficient to capture fibre bundles and foreign particles; pressure at the breaker plate should be recorded continuously. A pressure rise greater than 3.5 MPa over 60 min indicates screen blinding and requires replacement. Fibre length degradation occurs progressively in every melt history; in a single-screw extruder, much of the initial fibre length of 3 mm to 4 mm is reduced to a final moulded length commonly falling between 0.2 mm and 0.5 mm. A 30% regrind addition can reduce tensile modulus by 5% to 12% relative to virgin material because of fibre length reduction and sizing damage. Regrind addition above 30% is not recommended unless the finished part is verified under ISO 527-2 and ISO 179-1/1eA.
The following ranges are class comparisons from publicly available technical data for reinforced PP systems and are not lot-specific guarantees.
| Property | Test method | 25% GF PP copolymer | 30% GF PP | 20% mineral-filled PP |
|---|---|---|---|---|
| Density | ISO 1183-1 | 1.03–1.07 g/cm³ | 1.10–1.14 g/cm³ | 1.05–1.10 g/cm³ |
| Tensile modulus | ISO 527-2 | 4,500–6,000 MPa | 5,500–7,000 MPa | 2,500–3,200 MPa |
| Tensile stress at break | ISO 527-2 | 65–80 MPa | 75–90 MPa | 25–32 MPa |
| Charpy notched impact, 23 °C | ISO 179-1/1eA | 8–12 kJ/m² | 9–13 kJ/m² | 3–6 kJ/m² |
| Heat deflection temperature, 1.8 MPa | ISO 75-2/B | 130–150 °C | 140–160 °C | 65–80 °C |
| Mould shrinkage, parallel | ISO 294-4 | 0.2–0.4% | 0.1–0.3% | 0.8–1.2% |
A 25% glass fibre reinforced PP copolymer has lower density and a lower tensile modulus than a 30% glass fibre grade by about 10% to 20%, but it typically retains better surface appearance and lower tool wear than the higher-filled variant. Against a 20% mineral-filled PP compound, the glass-filled grade provides tensile modulus roughly two times higher and notched Charpy impact strength commonly two to three times higher. The practical substitution boundary is therefore set by stiffness and impact requirements, not by heat distortion temperature alone.
Moulds originally cut for unfilled or mineral-filled PP frequently require gate and runner modifications for 25% glass fibre reinforced PP copolymer. If the existing gate thickness is below 1.0 mm, short shots and fibre jamming at the gate may occur; increasing the gate thickness to 1.5 mm to 2.0 mm is preferable for wall sections of 2.0 mm to 3.0 mm. Melt pressure at the nozzle may rise by 10% to 25% compared with mineral-filled PP; a tool that previously filled at 70 MPa may require 80 MPa to 95 MPa. Packing time should be increased by 0.5 s to 1.0 s. Non-uniform mould temperature across a part length greater than 300 mm produces warpage; mould temperature variation must be maintained within ±5 °C.
Fibre orientation effects are more pronounced than in mineral-filled systems. Glass fibres align in the flow direction near the frozen skin and orient more transversely in the core; this produces shell-core anisotropy and can lower transverse Charpy impact. Weld lines formed downstream of holes or multi-gate layouts retain only 40% to 60% of unwelded impact strength. Before substituting mineral-filled PP, a flow simulation with fibre orientation tensor data and weld-line positioning should be run to identify fracture locations. In moulds with multiple gates, gate location should be rearranged so that weld lines are placed in low-stress zones or in compression, not in tensile ribs or impact bosses.
Applications documented in technical bulletins for 25% glass reinforced PP copolymers include automotive interior structural brackets, front-end carrier supports, appliance tubs, power tool housings, electrical connector frames, and pump housings. The selection is supported by a combination of heat deflection temperature above 130 °C at 1.8 MPa and tensile modulus above 4,500 MPa, without moving to a fully brittle system. In automotive under-bonnet service, validation should include immersion in ethylene glycol-water coolant at 100 °C for 1,000 h according to ASTM D543; sustained oxidative exposure above 120 °C is outside the safe operating window for PP copolymers. For electrical parts, comparative tracking index under IEC 60112 should be checked because glass fibres at the moulded surface can reduce the tracking resistance below that of unfilled PP. Published data for Scolefin 42 G 25-specific long-term heat-aging in all fluids is limited; therefore, each application must be qualified on the finished part.
REACH and RoHS compliance is shipment-specific. The polypropylene copolymer, glass fibre sizing, and pigment package are not expected to contain substances of very high concern above 0.1% by weight per Article 33, and not expected to exceed the RoHS Annex II limits for lead 1,000 mg/kg, cadmium 100 mg/kg, mercury 1,000 mg/kg, hexavalent chromium 1,000 mg/kg, PBB and PBDE 1,000 mg/kg per homogeneous material. The supplier certificate of conformance is the controlling document. For food-contact or medical use, specific migration testing under Regulation (EU) 10/2011, FDA 21 CFR 177.1520, or ISO 10993 must be completed on the final article; the raw pellet grade is not automatically approved for these applications.
| Regulation or standard | Scope | Acceptance criterion |
|---|---|---|
| REACH Regulation (EC) No 1907/2006, Article 33 | Communication of substances of very high concern | No intentionally added SVHC; concentration 0.1% w/w per SVHC |
| RoHS Directive 2011/65/EU, Annex II | Hazardous substances | Cd 100 mg/kg; Pb, Hg, Cr(VI), PBB, PBDE 1,000 mg/kg |
| ECHA Annex XVII | Restricted substances | Supplier confirmation required for restricted phthalates and other listed substances |
| Regulation (EU) 10/2011 | Plastic food-contact migration | Overall migration 10 mg/dm²; specific migration limits apply |
