LG Chem ABS TE-1020 is an extrusion-grade acrylonitrile-butadiene-styrene terpolymer supplied as a pelletized feedstock for sheet extrusion, coextrusion, and thermoforming operations. Unlike high-flow injection-molding ABS types, TE-1020 is designed to maintain a comparatively low melt-flow rate and higher melt strength during sheet formation, allowing the material to resist draw sag and gauge variation as the extrudate exits a flat die. Distributor datasheets and resin technical bulletins list density in the range of 1.04–1.06 g/cm³ under ISO 1183-1:2019 or ASTM D792, melt flow index of 1.0–3.0 g/10 min at 220 °C/10 kg under ISO 1133-1:2022 or ASTM D1238, and tensile yield strength of 38–46 MPa at 50 mm/min under ISO 527-2:2012 or ASTM D638-14. Flexural modulus is generally reported between 1.9 GPa and 2.3 GPa under ISO 178:2019 or ASTM D790-17, while notched Izod impact values at 23 °C range from 25 kJ/m² to 40 kJ/m² under ISO 180:2019. Thermal deflection under load is commonly specified in the 85–95 °C range at 1.82 MPa under ISO 75-2:2013 or ASTM D648-18, with Vicat softening values of 95–105 °C under ISO 306/B50 or ASTM D1525-17. Because regional technical datasheet revisions differ and colorants or masterbatch additions can shift end-use values by more than 10%, these ranges are engineering reference data rather than contractual specification limits.

In extrusion applications, TE-1020 is typically processed into sheet of 1.5–5.0 mm thickness on single-screw or twin-screw extruders with L/D ratios of 30:1–36:1. The grade is used for refrigerator door liners, luggage shells, sanitaryware faces, and automotive interior trim where thermoformed sheet must retain impact resistance after local draw. The low-flow architecture of TE-1020 distinguishes it from LG Chem high-flow injection-molding ABS grades such as HI-121H and RS-600, which prioritize shorter cycle times and thinner wall fill over melt strength and sheet gauge stability.

Why Pre-Drying Is the Primary Processing Gate for TE-1020

Moisture uptake in ABS is generally lower than in polycarbonate or polyamide, but TE-1020 sheet extrusion remains sensitive to residual water because processing temperatures exceed 200 °C. At moisture levels above approximately 0.05 wt-%, steam generation during plastication produces splay marks, die lines, and surface micro-bubbles. To reach dry conditions, a desiccant dryer with a dew point of -30 °C or lower and an inlet air temperature of 80–90 °C should be used for 3–4 h. The hopper should be sealed and return-air monitored. Overdrying at bed temperatures above 95 °C for extended periods can cause pellet discoloration and undesirable pre-oxidation of the butadiene phase, particularly at hopper residence times beyond 12 h. Batch-to-batch variation in ambient storage conditions, especially when relative humidity exceeds 60%, can extend dry times; processors should verify residual moisture using a Karl Fischer moisture analyzer or a calibrated loss-in-weight moisture balance. Published data for TE-1020 in high-humidity tropical handling configurations is limited, so conservative dry times are recommended.

On the extrusion line, barrel zone profiles typically begin at 200–220 °C near the feed throat, increase to 220–240 °C in the compression and metering zones, and maintain a die-head temperature of 210–230 °C. The melt temperature measured at the die exit should remain below 240 °C; sustained excursions above 250 °C accelerate degradation of the polybutadiene rubber phase and produce yellowing, gel particles, and reduced impact retention. Screen packs of 20/40/60 mesh or finer are standard, and a gear pump is recommended to damp pressure fluctuations and reduce gauge variation. Melt pressure after the screen changer should not exceed 250 bar; values above 300 bar generally indicate gel accumulation, insufficient heating, or excessive screw speed. Operator intervention at these pressures reduces the risk of screen failure and sheet optical defects.

When Deep-Draw Thermoforming Demands Controlled Melt Strength

For deep-draw parts such as refrigerator door liners or sanitaryware shells, sheet surface temperature should be maintained between 140 °C and 180 °C before forming. Temperatures below 135 °C cause corner thinning and stress whitening because the rubber phase cannot distribute deformation; temperatures above 185 °C cause surface oxidation, sag, and loss of thermoform definition. Plug-assisted forming is used when cavity draw ratio exceeds approximately 1.5:1; plug material, plug temperature, and assist speed are more critical with TE-1020 than with high-flow ABS because the higher melt strength resists rapid deformation. Mold temperatures of 60–90 °C are typical for ABS sheet, providing sufficient cooling to avoid sink marks and post-forming warpage. Vacuum levels of -0.6 to -0.9 bar and pressure-forming positive pressures up to 4–6 bar are used depending on sheet thickness and texture reproduction. At sheet thicknesses below 1.0 mm, TE-1020 may exhibit increased heating sensitivity and a narrower processing window; processors often switch to higher-flow sheet grades or reduce line speed.

Post-forming cooling must be controlled to minimize frozen-in stress in TE-1020. Parts ejected above 80 °C can continue to shrink and warp; cooling fixtures should hold critical dimensions until surface temperature falls below 65 °C. For coextruded structures, thickness distribution is governed by the individual layer viscosities; a cap layer with higher melt flow than the TE-1020 core may migrate toward the die walls, producing inconsistent thickness. Processing engineers typically match layer viscosities within ±10% at the shear rates prevailing in the die lip region. Dimensional shrinkage from the mold can range from 0.4–0.8% in the machine direction after 24 h, depending on sheet orientation and plug stretch.

Comparative Melt Flow and End-Use Differentiation Within the LG Chem ABS Portfolio

The difference between TE-1020 and other LG Chem ABS grades becomes most visible in flow length, impact retention, and secondary-process compatibility. The following table summarizes class-typical ranges compiled from industrial distribution sources; grade-specific datasheets should be consulted for current specification limits.

TE-1020 should not be regarded as a direct substitute for an electroplating grade. Electroless plating and electrolytic chromium deposition require a butadiene distribution and surface roughness that MP-211 controls through tailored particle size and processing stabilizers. TE-1020 can be chrome-plated in some decorative applications after chromic acid etch, but published peel-strength data for this specific configuration is limited, and adhesion may not approach MP-211 levels. Similarly, TE-1020 is not a flame-retardant grade; where UL 94 V-0 at 1.5 mm thickness is required, LG Chem AF-312A or an equivalent flame-retardant ABS should be selected and evaluated under end-use conditions.

Chemical compatibility of TE-1020 follows the general ABS pattern: resistance to aqueous acids and bases under intermittent contact is acceptable at ambient temperature, but aromatic hydrocarbons, ketones, esters, and chlorinated solvents can induce stress cracking and should be avoided. Because TE-1020 sheet often carries frozen-in stress from thermoforming, contact with isopropanol or ethanol-based cleaning agents should be validated at the final part geometry; unnotched ABS can fail at stress levels below yield after environmental exposure. The material may also lose impact strength when in prolonged contact with plasticizers or oils containing aromatic hydrocarbons. There is no single chemical resistance test that covers all end uses; ASTM D543-21 immersion testing and ISO 22088-2:2016 environmental stress-cracking evaluations are commonly specified. Published TE-1020-specific chemical resistance data for all solvent groups is limited, so laboratory screening is required before production release.

Regulatory status is application-dependent. The base resin can be evaluated under RoHS Directive 2011/65/EU Annex II using IEC 62321 methods for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE; REACH Candidate List screening at 0.1 wt-% threshold is standard. For food-contact uses, acrylonitrile-styrene copolymers are referenced in FDA 21 CFR 181.32, but the specific grade, colorants, processing aids, and extrusion thermal history must be shown to meet extractive limits under the intended food-contact temperature. Supplier documentation generally classifies TE-1020 as a combustible ABS grade with a UL 94 HB rating when tested at common sheet thicknesses; colorants and regrind content can alter ignition behavior. No statement of conformity should be made without a supplier-issued certification for the specific lot and region.

In production, regrind levels up to 20 wt-% are commonly used in ABS sheet extrusion when process stability and impact retention allow. Higher regrind ratios shift melt flow upward because the rubber phase crosslinks and chain scissions accumulate during repeated thermal processing. The low-flow starting point of TE-1020 can tolerate some shift, but impact values may decline disproportionately in thin-gauge sheet. Processors should limit regrind in deep-draw parts to avoid inconsistent wall thickness, and all incoming lots should be tested for melt flow index and notched Izod at 23 °C before release to high-speed lines. Published data for this specific configuration is limited, so internal process capability studies are necessary.