Toray Industries supplies the Toyolac ABS GF30 grade as a 30 wt% glass-fibre-reinforced acrylonitrile-butadiene-styrene copolymer. The GF30 designation denotes a nominal glass fibre loading of 30% by mass, verified in quality-control practice by combustion residue methods such as ISO 3451-1 or thermogravimetric analysis under ISO 11667. The material is intended for injection-moulded components in which unfilled ABS grades show insufficient tensile modulus, creep resistance, or dimensional stability. Glass fibre incorporation increases melt viscosity, reduces notched impact strength, and introduces fibre-orientation anisotropy; therefore the processing window, gating strategy, and part design require tighter control than general-purpose Toyolac ABS grades. The following sections define the grade through standardised mechanical, thermal, dimensional, and processing boundaries rather than qualitative commercial descriptions.

What separates a 30% glass-fibre-reinforced ABS from an unfilled Toyolac grade?

Compared with a general-purpose unfilled ABS, the 30% glass-fibre-reinforced grade raises tensile modulus from approximately 2,100–2,500 MPa to 7,000–9,000 MPa when tested under ISO 527-2. Flexural modulus under ISO 178 similarly increases from roughly 2,000–2,400 MPa to 6,500–8,000 MPa. Heat deflection temperature under ISO 75-2/A at 1.8 MPa shifts from a typical unfilled ABS range of 80–90 °C to approximately 100–110 °C. The coefficient of linear thermal expansion measured by ISO 11359-2 decreases from 70–90 × 10^-6/K for unfilled ABS to 25–40 × 10^-6/K for the GF30 grade, which is the primary reason the grade is selected for metal-replacement parts exposed to moderate temperature variation. Density rises from 1.04–1.06 g/cm³ to 1.26–1.30 g/cm³ under ISO 1183-1. These gains are offset by a reduction in notched Charpy impact strength under ISO 179-1/1eA, from 20–30 kJ/m² for many unfilled ABS formulations to 6–10 kJ/m² for the glass-reinforced grade. The toughness loss is not a defect but an inherent trade-off caused by stress concentration at fibre ends and reduced matrix ductility.

In production-scale compounding, fibre-length retention is governed by screw geometry and feeding position. Side-feeding of chopped glass after the primary melting zone of a twin-screw extruder with an L/D ratio near 40:1 reduces excessive fibre breakage compared with feeding glass at the main throat. The resulting pellets produce a fibre-length distribution that is further degraded during plastication in the injection-moulding barrel. This two-stage attrition is a known processing limit: even if the compounded pellet contains average fibre lengths above 300 µm, the average retained fibre length in a moulded part can fall below 250 µm because of back-flow, check-ring passage, and high-shear dispersion in the screw channels. Consequently, the mechanical property values shown on supplier datasheets are generated from standard test specimens moulded under defined conditions and are not direct translation factors to complex part geometries.

Drying is required before processing. A desiccant dryer set at 80–85 °C for 3–4 hours is the accepted starting condition to reduce moisture below 0.05% by mass, with moisture validation performed by ISO 15512. When ambient relative humidity exceeds 60%, fixed-time drying should not be relied upon; verification of residual moisture is necessary because ABS-GF30 can exhibit surface splay and hydrolysis-induced mechanical degradation in the presence of excess water. Recommended melt temperature is 240–260 °C at the nozzle, with mould temperature maintained at 60–80 °C. Barrel screw geometry should use a low-compression ratio, typically 2.0:1–2.5:1, with L/D near 20:1 for single-stage injection moulding. Hardened screw and barrel alloys or bimetallic barrel linings are specified because glass fibre abrasion accelerates wear in general-purpose nitrided components. Injection pressure requirements are higher than unfilled ABS due to elevated melt viscosity; a back pressure of 0.3–0.7 MPa is applied to improve melt homogeneity, but excessive back pressure further reduces fibre length.

When dimensional stability at elevated mould temperature becomes the controlling design constraint

Parts that must maintain assembly tolerances across multiple temperatures are the main application boundary for Toyolac ABS GF30. Unfilled ABS has a comparatively high and non-isotropic shrink response after demoulding, with mould shrinkage under ISO 294-4 commonly between 0.4% and 0.7%. The GF30 grade reduces mould shrinkage to approximately 0.1–0.3%, although the shrinkage is anisotropic because fibre orientation is aligned by flow. Along-flow shrinkage is lower than cross-flow shrinkage; this differential can generate warpage in flat geometries unless gate placement and wall-thickness transitions are balanced. The lower expansion coefficient is also measurable in service: between 23 °C and 55 °C, the GF30 grade typically exhibits 25–40 × 10^-6/K by thermal mechanical analysis under ISO 11359-2, whereas unfilled ABS may exceed 70 × 10^-6/K.

The tensile properties of the GF30 class are usually referenced at 23 °C and 50% relative humidity. Representative industrial values for 30% glass-filled ABS place tensile stress at break under ISO 527-2 between 85 MPa and 105 MPa, with tensile modulus between 7,000 MPa and 9,000 MPa. Flexural strength under ISO 178 is commonly reported in the 125–150 MPa range, with flexural modulus between 6,500 MPa and 8,000 MPa. The elevated modulus is the result of rigid glass fibres carrying a disproportionate share of tensile stress, while the ABS matrix contributes impact tolerance and melt processability. At elevated temperature, modulus retention is improved compared with unfilled ABS up to the practical service limit; however, published long-term creep and fatigue data for this specific Toray grade are limited. Component designers should generate application-specific data using ISO 899-1 for tensile creep and ISO 13003 for fatigue behaviour rather than extrapolating short-term tensile curves.

The heat deflection temperature of 100–110 °C under ISO 75-2/A at 1.8 MPa does not constitute a continuous-use temperature rating. Long-term thermal ageing above 90 °C can reduce impact strength and cause surface oxidation in unpainted ABS matrices. If the application requires continuous exposure above 100 °C, a glass-filled polyamide or polybutylene terephthalate may be more appropriate. The GF30 grade is therefore positioned for short-term thermal excursions, structural support brackets, appliance chassis components, and housings where dimensional stability rather than sustained high-temperature resistance is the controlling requirement.

Surface finish, weld-line anisotropy and fibre-length retention

Glass-fibre-reinforced ABS does not reproduce the surface appearance of unfilled ABS. Fibre read-through at the surface is visible as a matte, fibrous texture after moulding, and high-gloss Class A finishes generally require painting, film lamination, or a resin-rich outer layer. Mould surfaces must be hardened or chrome-plated because the glass fibres abrade conventional tool steels. Weld-line regions in GF30 are structurally weak relative to the bulk material. Under tensile loading perpendicular to a weld line, strength retention can fall to 50–70% of the parent material value because fibres do not bridge the weld interface; the weld region becomes matrix-dominated. In contrast, unfilled ABS weld lines may retain a higher percentage of ultimate tensile strength. Flow-front temperature, melt temperature, and injection speed influence weld-line strength, but the fundamental limitation remains the discontinuous fibre phase.

Fibre orientation also creates anisotropic mechanical properties. Along-flow tensile modulus may exceed cross-flow modulus by 15–30% depending on part thickness and mould-filling pattern. This anisotropy is further expressed in impact behaviour and thermal expansion. Designers should orient gates so that primary tensile service loads align with fibre direction, or use multiple gates and flow analysis to distribute orientation more evenly. Shrinkage anisotropy is measured by ISO 294-4 on plaque specimens; for GF30, the along-flow shrinkage may be as low as 0.05–0.15%, while cross-flow shrinkage can be 0.25–0.40%. The spread is larger than unfilled ABS, which means flat plaques may curl if cooling is non-uniform or wall thickness varies abruptly. Uniform wall thickness, progressive transitions, and balanced cooling are required to limit differential thermal contraction after ejection.

The glass fibre content also influences melt viscosity and flow length. Spiral-flow length under company-specific moulding tests is shorter than unfilled ABS at the same melt temperature; published spiral-flow curves for this specific GF30 configuration are limited. Moulders often compensate by raising melt temperature toward the upper limit of 260 °C and increasing injection speed, but these adjustments can degrade fibre length and increase shear heating. A sharp rise in melt temperature beyond 270 °C should be avoided because ABS can begin thermal degradation, producing yellowing and free monomer odour. Barrel residence time should be minimised; if the cycle is interrupted, the barrel should be purged with a general-purpose ABS or purging compound to prevent glass-abrasive hold-up in stagnant zones.

Comparative property ranges across glass-filled Toyolac ABS formulations

The property ranges below are representative of industrial glass-filled ABS grades and are supplied for systematic comparison. Toray lot-specific certificates of analysis and datasheet values take precedence for the exact Toyolac ABS GF30 specification.

Compared with ABS GF20, the GF30 grade provides a further modulus increment and lower expansion coefficient, but moulders observe a measurable increase in injection pressure requirement and a further reduction in weld-line strength. Compared with mineral-filled ABS, glass-fibre reinforcement generally yields higher tensile and flexural strength, whereas mineral fillers may offer more isotropic shrinkage and smoother surface appearance. Compared with unfilled ABS, GF30 is significantly stiffer and more dimensionally stable, but it is less tough, more viscous, and more abrasive to tooling.

The grade is used for structural brackets, fan shrouds, appliance frames, pump housings, electrical enclosures, and power-tool housings where a tensile modulus above 7,000 MPa under ISO 527-2 is necessary and where short-term exposure to temperatures up to approximately 100 °C under low load is anticipated. Regulatory compliance for standard formulations is generally assessed under RoHS 2011/65/EU and REACH EC 1907/2006; flammability classification is commonly UL 94 HB at typical wall thickness, but colour, thickness, and additive package must be confirmed for each final grade. The material is not specified for sustained contact with strongly alkaline process fluids or for food-contact applications unless a specific Toray regulatory statement is obtained. For load-bearing components requiring predictable long-term creep response, published data for this specific configuration is limited, and component validation should include application-specific moulded plaques, tensile creep testing under ISO 899-1, and thermal cycling with dimensional inspection under ISO 294-4.