Lotte Chemical ABS VE-1010 is an acrylonitrile-butadiene-styrene copolymer supplied as a pelletized extrusion-grade resin for thick-gauge sheet, profile, and coextruded thermoforming structures. The material is classified within the Starex ABS product family as a general-purpose extrusion/thermoforming grade, not as a plating grade, not as a flame-retardant system, and not as a high-gloss injection-molding grade. Published product data place the nominal density at 1.04 g/cm³ under ISO 1183-1:2019 and the melt flow rate at 4.0 g/10 min under ISO 1133-1:2022 using a 220 °C/10 kg condition. The dry-blend composition consists of a styrene-acrylonitrile continuous phase and a discrete butadiene rubber phase; the rubber-phase particle size distribution and grafting are tuned to maintain melt strength during sheet heating rather than to maximize gloss or flow. The product is supplied in pellet form, with a bulk density in the range of 0.55–0.65 g/cm³, and should be stored in closed containers to prevent moisture regain.

Before extrusion, the resin must be dried in a desiccant dryer with an air dew point of -30 °C or lower. Recommended inlet air temperature is 80 °C, with a residence time of 2–4 h. At ambient relative humidity above 60 %, residence time should be extended to 6 h; the target moisture content before melt processing is below 0.05 wt%. Drying above 90 °C is discouraged because the butadiene phase can oxidatively degrade and pellets may agglomerate in the hopper. If the sheet surface exhibits splay, microvoids, or silver streaking, the first corrective action is verification of dryer dew point and pellet moisture content by ISO 15512:2019 rather than increasing barrel temperature.

Batch-to-batch variation in melt flow rate should be monitored on receipt. A shift of more than 0.5 g/10 min from the reference value may require adjustment of die lip gap, roll speed, or forming cycle time. If color concentrates or UV packages are introduced at the sheet extruder, they should be added at 2–4 wt% and dispersed through a single-screw screw with a Maddock mixing section. Poor distributive mixing is indicated by color streaks or wedge-shaped surface defects in the formed part.

Where does VE-1010 diverge from injection-molding ABS in melt architecture?

The principal distinction between VE-1010 and Lotte Chemical injection-molding ABS grades is rheological rather than compositional. Extrusion-grade resins are produced with a higher molecular-weight fraction to increase elongational viscosity and reduce sheet sag during the heating stage of thermoforming. The reported melt flow rate of 4.0 g/10 min at 220 °C/10 kg places VE-1010 in the low-flow category for ABS, which corresponds to higher die swell, higher melt pressure, and less pronounced shear thinning than low-viscosity injection grades. This molecular architecture supports uniform draw in sheet and reduces neck-in at the die, but it also raises the required plastication torque in single-screw machines. Published data for this specific configuration is limited for direct comparison with high-flow Starex injection grades; plant-scale comparisons should be made at the same melt-temperature and shear-rate conditions using capillary rheometry data, not solely by melt flow rate.

On a 30:1 L/D single-screw sheet extruder with a barrier screw and compression ratio of 2.5:1 to 3.0:1, the melt-temperature profile from hopper to die is typically set between 200 °C and 240 °C. Barrel zone set points should follow a rising profile, for example 180 °C, 200 °C, 210 °C, 215 °C, and 220 °C; die zones are maintained at 210–230 °C. A screen pack of 40/60/80 mesh protects the gear pump from contaminants. Gear pump inlet pressure should be controlled between 5 MPa and 10 MPa; pressure fluctuations greater than ±0.3 MPa at the pump inlet are an indication of feed bridging or high regrind fines. Melt temperature at the die should be confirmed with a needle thermocouple. Variation greater than ±2 °C across the die can cause thickness variation and residual stress differences in the sheet.

Regrind addition is permitted up to 20 wt% for non-appearance sheet; for deep-draw thermoforming applications, regrind should not exceed 10 wt% unless impact and thermal stability testing is repeated. Each regrind heat history reduces the rubber-phase crosslink density and lowers notched impact. A conservative operating boundary for retainable sheet impact is a maximum of 2 heat histories. Regrind fines content above 5 wt% of the blend can cause feed instabilities and surface pitting.

Thermoforming Window, Sheet Stock Condition, and Regrind Limits

Sheet stock produced from VE-1010 is normally characterized before thermoforming for thickness uniformity, moisture, and residual orientation. Thickness tolerance for deep-draw parts should be held to ±0.05 mm or better across the sheet, because thin areas preferentially absorb radiant heat and cause local thinning. The forming temperature window is measured by surface temperature; for VE-1010 sheet, the practical lower forming boundary is 140 °C, and the upper surface limit is 180 °C. Above 180 °C, surface gloss loss and rubber-phase degradation become detectable; below 140 °C, springback and microcracking at mold corners increase. Vacuum forming cycles require a mold temperature of 60–90 °C to reproduce texture and reduce internal stress. For sheet thickness above 3 mm, additional sheet predrying may be required if storage humidity exceeds 65 % RH.

Refrigerator inner-liner and sanitary-ware applications impose contact with food acids, vegetable oils, and cleaning agents. VE-1010 sheet is evaluated under ISO 175:2010 for immersion in 10 wt% acetic acid and refined vegetable oil at 23 °C; limited surface attack is acceptable. For food-contact articles, migration testing under EU Regulation 10/2011 and FDA 21 CFR 177.1020 must be performed on the final article because extrusion and thermoforming heat history may alter low-molecular-weight extractables. The grade is supplied with a general compliance statement for RoHS 2011/65/EU and REACH (EC) No 1907/2006 SVHC disclosure, but these statements do not replace article-specific compliance. Published data for specific food-contact configurations is limited.

When the grade is processed on a single-screw sheet line below its minimum plastication temperature

Failure modes observed on production-scale sheet lines are dominated by incomplete plastication and high melt pressure. If the barrel set point remains below the flow onset of the styrene-acrylonitrile continuous phase, the screw transmits mechanical energy as frictional heat, causing melt-temperature heterogeneity. The extruder motor load climbs, and unmelted particles appear as fisheyes or surface roughness in the sheet. The corrective action is not to increase screw speed; it is to raise the rear barrel set point to at least 180 °C and to inspect the screw for excessive wear. On a 30:1 L/D single-screw machine, severe screw wear with flight clearance above 0.2 mm causes backflow and reduces the effective L/D. Industrial practice suggests that melt pressure should be monitored at the breaker plate; a pressure rise above 15 MPa indicates screen-pack occlusion. Published data for this specific configuration is limited, but sheet-line operators report that screen-pack changes are required when pressure drop across the pack increases by more than 20 %.

In coextruded capstock structures, VE-1010 can serve as a substrate or a cap layer. When used as a cap layer over high-impact polystyrene or recycled ABS, the melt viscosity match is critical. A mismatch in melt flow rate greater than 2 g/10 min at the same condition can produce interfacial instability or layer rearrangement. The die should be a multi-manifold or feedblock with layer distribution designed for ABS; the melt temperature difference between adjacent layers should be less than 10 °C.

A consolidated set of representative physical, mechanical, and thermal values is provided for material selection. These values are not minimum specifications; they are typical values measured on injection-moulded or compression-moulded test specimens and may change with sheet thickness, forming orientation, and regrind content.

Compared with high-flow injection-molding ABS grades such as those in the Starex HI or GR series, VE-1010 is intentionally lower in melt flow and higher in melt strength. This makes it less suitable for thin-wall injection-moulded components with flow lengths exceeding 150 mm at 2.0 mm wall thickness. The same property improves sheet sag resistance during thermoforming: a 4.0 mm sheet heated to 170 °C retains better dimensional stability than a high-flow ABS. Direct numerical comparison with other products is limited unless the same moulding or extrusion condition is used. Published data for this specific configuration is limited.

The grade is incompatible with ketone, ester, and chlorinated hydrocarbon solvents; prolonged contact with these agents causes environmental stress cracking. It should not be blended with PVC stabilizers containing lead or cadmium where food-contact compliance is required, nor with amine-based additives that can accelerate rubber-phase oxidation. The addition of flame-retardant packages or external lubricants must be validated for UL 94 and migration compliance.