Toray Industries supplies the ABS 930-355 grade under the Toyolac trade name as a high-flow acrylonitrile-butadiene-styrene injection moulding resin. The designation conforms to ISO 1043-1:2011 as ABS and is available in pellet form for conventional screw injection moulding. The grade is differentiated within the Toray styrenics portfolio by its elevated melt volume-flow rate, which reduces cavity fill pressure in long-flow, thin-wall geometry. Representative physical data list a density of 1.05 g/cm³ by ISO 1183-1:2019 and a melt volume-flow rate in the range 33–35 cm³/10 min at 220°C/10 kg by ISO 1133-1:2022. The material carries a UL 94 HB flame rating at 1.5 mm and is positioned for enclosures, housings, and structural interior components where cycle time and dimensional stability are controlled simultaneously. Predrying is mandatory; residual moisture above 0.02% produces splay at the gate during high-shear filling.

What Distinguishes Toyolac 930-355 from Lower-Flow ABS Series?

Relative to medium-flow ABS grades in the 12–18 cm³/10 min range, 930-355 shifts the viscosity curve downward at injection shear rates. A melt volume-flow rate of approximately 34 cm³/10 min at 220°C/10 kg corresponds to an apparent viscosity reduction of roughly 20–28% at 1000 s⁻¹ when compared with a 17 cm³/10 min control, based on capillary rheometry; published data for this specific configuration is limited. The processing consequence is that 1.2 mm wall sections can be filled at lower hydraulic pressure, typically reducing peak injection pressure by 15–25% under identical tooling conditions. The trade-off appears in room-temperature impact retention: high-flow ABS grades typically exhibit a 5–10% lower notched Charpy impact value than lower-MVR high-impact grades at equal wall thickness. Molders should therefore verify low-temperature impact requirements before substituting 930-355 into an existing 700-series tool.

Representative datasheet values for 930-355 are summarised below. These are typical values from Toray technical literature and are not specification limits.

Elevated flow does not imply elevated heat resistance; the grade’s deflection temperature under load remains constrained by the amorphous ABS matrix. At 1.8 MPa, the observed value lies near 88°C, which limits use in continuously loaded structural parts above 80°C ambient. Short-term excursions to 95°C are tolerated only if mechanical loads are below 0.35 MPa. For UL 94 HB applications, the rating is thickness-dependent and should be confirmed on the actual moulded plaque; colour concentrates and regrind can alter ignition behaviour.

Drying, Barrel Setback, and Clamp Force Requirements

Pre-drying at 80±5°C for 3–4 h in a desiccant dryer is recommended when pellet moisture exceeds 0.1% by weight. The target residual moisture is below 0.02%, measured by Karl Fischer titration to ISO 15512:2019. Barrel temperature profiles from feed throat to nozzle are typically 180°C, 210°C, 220°C, 230°C, 230°C; melt temperature should be maintained at 220–240°C and never exceed 250°C for more than 5 minutes. A screw with L/D 20:1 to 24:1 and a non-return valve is acceptable. Shot size should occupy 25–75% of barrel capacity to limit residence-time distribution. Clamp force should be calculated at 0.5–0.8 tonnes per square centimetre of projected area; insufficient clamp force invites flash at the elevated MVR of this grade. When hot runners are used, manifold temperature should not exceed 240°C, and gate geometry should be sized for a shear rate below 100,000 s⁻¹.

Thin-wall appliance fascia panels and power-tool housings with flow length-to-thickness ratios above 150:1 benefit from the grade’s viscosity profile. At 1.2 mm nominal wall, the reduced fill pressure permits lower clamp tonnage and smaller machine selection than an equivalent medium-flow grade. Mould venting becomes critical because the faster melt front can trap air; vents of 0.02–0.03 mm depth at the last-fill location reduce burn marks in production trials. Gate blush and jetting are controlled by using a fan gate or a tab gate with a land length of 0.8–1.2 mm. For appearance parts, mould temperature in the range 40–60°C balances surface gloss against cycle time; lower mould temperatures increase weld-line visibility and internal stress.

When 930-355 Replaces Medium-Flow ABS in Thin-Wall Housings

Direct substitution into existing tools is usually successful only when the tool has adequate venting and no excessive parting-line wear. Because the grade exhibits higher cavity pressure at the gate but lower pressure loss along the flow path, the pressure distribution shifts from that of a 17 cm³/10 min grade. Injection speed can be reduced by 10–20% to maintain equivalent flow-front velocity while avoiding jetting at the gate. Weld-line strength in 930-355 at 2.0 mm wall is approximately 85–90% of the corresponding medium-flow grade, based on comparative ISO 527-1/-2:2012 tensile bars with a butt weld line; however, published data for this specific configuration is limited. If the part requires snap-fit deflection, the lower melt viscosity can produce more favourable molecular orientation at the hinge, but the notch sensitivity of the ABS matrix remains. A tool-maintenance interval shortened from 500,000 to 300,000 cycles may be required where flash formation is influenced by parting-line wear of 0.03 mm or greater.

Impact Retention Across Thickness and Temperature

At 3.0 mm, room-temperature Charpy notched impact remains ductile, but at 1.5 mm the constraint raises the ductile-brittle transition temperature. Published ABS data suggest a transition shift from -30°C to -10°C as wall thickness decreases from 3.0 mm to 1.5 mm; specific 930-355 values are not available in all open literature. Moulded-in stress from rapid cooling at 40°C mould temperature reduces low-temperature impact by an additional 10–15%. Therefore, structural snap-fit features in thin-wall sections should be evaluated under ISO 179-1/1eA:2010 at the lowest service temperature rather than at 23°C. When molecular orientation from high-shear filling is frozen in, tensile yield stress may rise by 5–8% parallel to flow and fall perpendicular to flow; ISO 527-2 specimens cut from plaques show anisotropy.

How Does Regrind and Thermal History Affect Impact Retention?

Post-industrial regrind can be incorporated at 20 wt% in non-appearance applications, but each heat history reduces the polybutadiene rubber-phase crosslink density and lowers notched impact. General ABS data indicate that three regrind passes at 230°C can reduce Charpy notched impact by approximately 15% at 23°C; published data specific to 930-355 is limited. Therefore, lot-to-lot verification under ISO 179-1/1eA:2010 is required when regrind content exceeds 10 wt%. Drying of regrind is identical to virgin pellets, but blend segregation in central conveying systems can produce melt-flow variation exceeding 5% between shots if hopper loading is not sequenced.

Regulatory compliance for the grade as stated in supplier documentation is summarised below.

Electrical/electronic auxiliary housings, battery-charger shells, and appliance control-panel frames are candidate applications where the combination of flow length, gloss, and moderate heat resistance is acceptable. For medical device enclosures, biocompatibility is not a specified attribute for this grade in current supplier documentation; therefore, ISO 10993-1 evaluation should not be assumed without written confirmation. Moulders running 930-355 on electric machines report lower specific energy consumption relative to medium-flow grades, but comparative production data across identical tools have not been formally published.