The material designated Dongguan Hailong Plastic ABS GF10% is a short-glass-fiber-reinforced acrylonitrile-butadiene-styrene injection molding compound. The commercial model identifier is the suffix GF10%, indicating a nominal 10% by weight loading of chopped glass fiber in an ABS carrier matrix. It is supplied as cylindrical pellets with a bulk density typically between 0.55 g/cm³ and 0.65 g/cm³. Molded density for a comparable 10 wt% glass-filled ABS compound is reported in the range of 1.11 g/cm³ to 1.16 g/cm³ under ISO 1183-1. The product is intended primarily for injection molding; profile extrusion and blow molding are not recommended because the short glass fiber reduces melt extensibility and parison stability.

During twin-screw compounding, glass fiber is typically introduced downstream into the molten ABS melt to limit excessive fiber breakage. Chopped strand input lengths of 3.0 mm or 4.5 mm are common, but final fiber length after injection molding is usually reduced to 0.2–0.4 mm by screw shear. The glass content may be confirmed by thermogravimetric analysis or ash testing; the supplier should report the actual glass mass fraction to ISO 1172 or an equivalent internal method. Batch-to-batch variation in glass content influences melt viscosity and tensile modulus; incoming lots should also be checked for melt flow rate under ISO 1133-1 at 220°C/10 kg as a screening tool. Published data for Dongguan Hailong’s specific lot is limited; the following ranges are compiled from technical data sheets of chemically comparable short-glass ABS compounds and should not replace lot-specific certification.

What Mechanical Property Changes Are Introduced by a 10 wt% Glass Fiber Loading?

Glass fiber at 10 wt% raises tensile modulus and flexural modulus relative to unfilled ABS while reducing notched impact strength. The comparative values in the table are representative ranges for general-purpose injection grades; they are not guarantees for this specific compound.

Tensile specimens should be tested under ISO 527-2 using ISO Type 1A specimens at 23°C and 50% relative humidity after conditioning. Notched Izod impact is sensitive to gate orientation and moisture; dry-as-molded specimens may show lower values than conditioned specimens. Weld-line tensile strength is lower than nominal tensile strength because glass fibers oriented in the flow direction do not bridge the weld-line boundary. In poorly vented or cold tools, weld-line strength may fall to 30–60% of the base ISO 527-2 value.

Creep resistance at elevated temperature improves with glass fiber. Under short-term load, the 10 wt% glass compound exhibits lower tensile creep strain than unfilled ABS; however, published creep modulus data for this specific configuration is limited. Designers should request tensile creep modulus curves from the supplier if the part is under continuous load above 40°C.

For the injection molder, moisture control is the first boundary condition. ABS is hygroscopic, and the presence of glass fiber does not eliminate moisture uptake. Pellets exposed to ambient relative humidity above 60% for longer than 30 min require desiccant drying at 80–90°C for 2–4 h to achieve a residual moisture content of ≤0.05 wt% by Karl Fischer titration or ISO 15512. A drying hopper dew point of -30°C or lower is recommended. Insufficient drying produces splay, surface silver streaks, and reduced tensile strength under ISO 527-2.

Barrel temperatures should be profiled from 210–230°C in the feed zone to 240–260°C in the metering zone, with a nozzle setting of 230–250°C. Mold temperature should be maintained at 60–80°C. Injection pressure commonly falls between 70 MPa and 120 MPa, with back pressure of 0.3–0.7 MPa to improve fiber dispersion. A general-purpose screw with L/D ratio of 20:1 and compression ratio of 2.0–2.5 is used; high-compression screws may increase fiber breakage. Clamp force is calculated from projected area and expected cavity pressure; for a 100 cm² projected area part with cavity pressure of 30–50 MPa, the required clamp force is approximately 30–50 tonnes excluding runner losses.

Residence time at 250°C should not exceed 5 min; above 270°C, the butadiene phase degrades and produces yellowing, volatile emissions, and loss of impact strength. Shutdowns longer than 10 min require purging with a rigid styrenic or polyolefin purge compound. Regrind addition above 20 wt% is not recommended unless the molder measures notched Izod impact and fiber length distribution because repeated shear reduces fiber length and impact performance. Hot-runner channels smaller than 2.5 mm diameter may accumulate fiber bundles and cause shot-weight variation; valve gates should be sized to the filled-material flow path.

Mold Temperature, Fiber Orientation, and Surface Defect Boundaries in Thin-Wall Sections

When mold temperature is kept below 50°C, the melt surface solidifies before the glass fibers are fully wetted, producing visible fiber protrusion and low-gloss areas on textured cavity surfaces. Raising the mold to 60–80°C improves fiber coverage and knit-line appearance but increases cycle time. Surface gloss measured under ISO 2813 is process-dependent; no universal gloss value is published for this filled grade.

In thin-wall sections below 1.5 mm, the increased viscosity of the glass-filled compound may require injection pressures above 100 MPa. Mold-filling simulation is recommended before committing to wall stock below 1.0 mm. Fiber orientation produces anisotropic shrinkage; flow-direction shrinkage can be 0.1–0.3% lower than transverse-direction shrinkage, leading to out-of-flatness in flat covers. Circular or fan gates and uniform wall thickness reduce differential shrinkage. Weld lines should be moved to low-stress regions by gate relocation; if a weld line cannot be moved, the part should be tested under ISO 527-2 with a weld line specimen rather than assuming uniform properties.

In electronic enclosures, the compound is specified where an unfilled ABS enclosure would show unacceptable post-mold warpage or creep at elevated internal temperatures. The typical heat deflection temperature of 100–110°C under ISO 75-2/A supports short-term exposure near 90°C, but continuous-use temperature ratings are not provided by this test. For appliance structural parts, the material is used for motor brackets, fan housings, and support frames. Electrical safety tests such as glow-wire at 650°C under IEC 60695-2-11 or IEC 60695-10-2 require part-specific certification; glass reinforcement does not inherently alter the flammability class of the ABS matrix. The base resin may achieve UL 94 HB at 1.5 mm, but a V-0 rating should not be assumed without flame-retardant additives.

For automotive interior brackets, use is limited to non-UV-exposed locations. Burn-rate requirements under FMVSS 302 or ISO 3795 must be verified on the molded part. The glass-filled ABS grade is not recommended for exterior body panels because gloss, weathering, and low-temperature impact performance are typically insufficient without painting or coating. Published data for this specific configuration in exterior applications is limited.

When Glass Fiber Content Increases to 20% or 30% in ABS Compounds

At 20 wt% glass loading, tensile modulus and heat deflection temperature increase, but notched Izod impact may fall below 5 kJ/m² under ISO 180/A, making snap-fit and latch features vulnerable. At 30 wt%, differential shrinkage between flow and transverse directions can reach 0.3–0.5%, producing measurable warpage in flat parts; mold-flow analysis is required. The GF10% product is therefore selected when surface finish, toughness, and dimensional stability must be balanced. It produces lower mold and screw abrasion than GF20% or GF30% compounds because the lower glass content reduces contact wear. However, use of glass-filled ABS still requires hardened screws and bimetallic barrels because the glass fiber causes more wear than unfilled ABS.

Compared to unfilled ABS, the 10 wt% glass compound can increase melt pressure by approximately 15–30% at a given injection speed, requiring larger gates and runners. Gates should be positioned in the thickest section and sized to minimize shear heating. The compound is not recommended for living hinges or tight snap-fits because the glass fibers reduce elongation at break and create notch sensitivity.

When compared with polypropylene copolymer compounds containing 10 wt% glass fiber, the ABS-based product has higher density and higher heat deflection temperature. PP GF10% typical density is 0.97–1.02 g/cm³ under ISO 1183-1, while ABS GF10% is 1.11–1.16 g/cm³. The HDT of PP GF10% at 1.82 MPa is often 80–100°C under ISO 75-2/A, below the 100–110°C range of the ABS compound. ABS GF10% also provides lower post-mold shrinkage and higher surface hardness, but it is more sensitive to ketones, esters, and aromatic hydrocarbons than polypropylene.

In contrast with PC/ABS blends, the GF10% ABS compound usually has higher tensile modulus but lower multi-axial impact strength and lower low-temperature ductility. For applications requiring notched Izod impact above 20 kJ/m² at -30°C under ISO 180/A, unfilled PC/ABS is more suitable. Selection should be based on ISO 527-2 tensile testing and ISO 6603-2 puncture testing, not on single-point data.

Regulatory Documentation and Compliance Checklist for Purchasing Specifications

Purchasing specifications should require the supplier to provide the following documents and test data. The GF10% designation by itself does not constitute a regulatory certification.