BEPL ABS ABS 700 is an acrylonitrile-butadiene-styrene terpolymer supplied by Bhansali Engineering Polymers as an injection-moulding grade in the 700 series. The product is manufactured as a compounded pellet containing the base resin, internal lubricants, thermal stabilisers, and release agents. The grade is specified for appliance fascia panels, electrical enclosures, vacuum-cleaner bodies, automotive interior trim, and consumer electronics housings. Because BEPL lot-certified datasheet values are not reproduced in this document, the numerical ranges presented below represent the performance envelope expected for this product class and shall be checked against the supplier certificate of analysis before production release.

The ISO 2580-1 data block and release properties for ABS 700

Under ISO 2580-1:2011, ABS moulding and extrusion materials are designated by a code block comprising melt volume-flow rate, Vicat softening temperature, Charpy impact strength, flexural modulus, and additional data. A commercial grade of the ABS 700 type may be designated as ABS, MVR (220°C/10 kg), VST B/50, Charpy 1eA, FM. The designation system is intended to classify, not to replace, the supplier test report. The following release-property ranges are determined on test specimens prepared according to ISO 2580-2:2012 and conditioned under ISO 291:2018 at 23°C and 50% relative humidity.

• Density by ISO 1183-1:2019: 1.03–1.07 g/cm³
• Melt volume-flow rate by ISO 1133-1:2022 at 220°C and 10 kg: 15–25 cm³/10 min
• Tensile stress at yield by ISO 527-2:2012 on 1A specimens at 50 mm/min: 40–50 MPa
• Tensile modulus by ISO 527-2:2012: 2.0–2.6 GPa
• Flexural strength by ISO 178:2019: 60–75 MPa
• Charpy notched impact strength by ISO 179-1:2010 with 1eA specimens at 23°C: 20–35 kJ/m²
• Vicat softening temperature VST B/50 by ISO 306:2022: 95–105°C

The grade is normally supplied with an internal lubricant package that improves ejection from multi-cavity hot-runner tools; high-shear colour masterbatches can shift MVR by 3–8%, and processors should re-check flow length after adding 2–4 wt% colour concentrate.

Material handling on production lines operating where warehouse relative humidity exceeds 60% requires predrying in a desiccant-bed dryer with inlet-air dew point no higher than −30°C. Pellet drying at 80–85°C for 3–4 h typically lowers moisture content to below 0.02% by weight; cold pellets transferred from unheated storage need longer residence or a hopper dryer sized for at least 4 h at temperature. On injection moulding machines with hot-air hopper dryers, airflow must be distributed through the full pellet bed, not just the hopper walls, because channelling leaves wet cores that produce silver streaks at melt temperatures above 235°C. Undried ABS 700 processed with a nozzle temperature above 240°C may also show gate-zone delamination and surface splay on textured cavities.

How does ABS 700 behave during injection moulding when melt residence time is extended?

The rheological response of ABS 700 follows shear-thinning behaviour typical of dispersed polybutadiene graft phases in a styrene-acrylonitrile continuous phase. On a general-purpose screw with 32:1 L/D and a compression ratio of 2.5:1, a practical barrel profile from rear to nozzle begins at 190/210/220/230/235°C. The resulting melt temperature remains near 230–245°C, provided screw recovery does not exceed 8–10 min total residence. Extended residence above 250°C initiates thermo-oxidative scission of the polybutadiene phase, causing yellowing and a measurable drop in Charpy impact strength. The grade should be purged with acrylic or general-purpose polycarbonate-based purging compounds after stops longer than 15 min. Holding pressure is normally set between 40 MPa and 60 MPa hydraulic pressure, while the required clamp force can be estimated at 0.3–0.5 t/cm² of projected area for thick-wall appliance covers and 0.5–0.8 t/cm² for thin-wall electrical enclosures with flow-length-to-wall-thickness ratios above 180:1. Back pressure should remain within 0.5–1.0 MPa to avoid over-shearing the rubber phase.

Typical mould temperature for ABS 700 is set at 30–60°C. Lower mould temperatures below 25°C assist cycle-time reduction but reduce gloss and promote moulded-in stress on polished surfaces; mould temperatures above 60°C increase sink-mark risk in thick sections due to differential cooling. Screw recovery should be complete before the cooling timer expires; if screw back-pressure is raised above 1.0 MPa, the resulting shear heating can raise melt temperature by 5–10°C and shift the effective MVR. Injection speed is typically set in the range 60–120 mm/s for medium-thickness sections. Vent depths for ABS 700 should not exceed 0.03 mm on parting lines to prevent flash.

On multi-cavity hot-runner tools, cavity-to-cavity melt-temperature variation greater than 5°C can produce inconsistent Charpy values because the rubber-phase morphology is frozen differently during filling. Pressure sensors in the runner system should be used to balance fill time to within 0.05 s between first and last cavity. If a mould trial records short shots in flow-length ratios exceeding 200:1, nozzle temperature should be raised only within the 245°C limit; higher melt temperature may improve fill but sacrifices environmental stress-cracking resistance. Regrind from sprues and runners can be added up to 20 wt% without measurable loss in Charpy impact strength if the flake is dry and not thermally degraded; above 30 wt%, melt flow may increase by 5–10% and colour consistency can shift. Reuse of burned or yellowed start-up purge is not permitted, because the polybutadiene phase has already cross-linked or scissioned and will reduce Charpy impact at −30°C by more than 15%.

Comparative performance envelope against medium-impact ABS, glass-filled ABS, and PC/ABS

ABS 700 differs from lower-number BEPL grades principally through a higher notched impact-strength envelope without transitioning to an alloy. Compared with a medium-impact injection ABS, the 700 grade typically retains a lower flow-path stiffness at equivalent wall thickness, but the low-temperature impact property is more suitable for appliance covers subject to accidental drop loading. Glass-filled ABS provides tensile stress at yield above 70 MPa at 20 wt% glass loading and heat deflection temperatures near 105–115°C, whereas unfilled ABS 700 remains below 55 MPa and retains lower density. PC/ABS blends exhibit higher Vicat softening temperature and better notched impact at 0°C, but they require higher drying temperatures and more aggressive screw wear considerations.

The table uses representative product-class ranges rather than lot-certified data. Published data for the exact BEPL ABS ABS 700 datasheet may show narrower internal limits than these ranges.

When ABS 700 enters chemical contact with plasticizers, oils, or solvent-based cleaning agents

Environmental stress-cracking resistance is a limitation for ABS 700 when external loads are applied in the presence of aromatic hydrocarbons, esters, ketones, or certain plasticizers. Fixed-strain testing according to ASTM D543-21 at 0.5% outer-fibre strain and 24 h immersion in toluene can reduce elongation at break to below 5% even though the unexposed material may exceed 15%. The product should not be specified for parts repeatedly wiped with aggressive solvent cleaners unless the strain level is kept below 0.3% and moulded-in stress is minimised by annealing at 80°C for 2 h. Common household oil and weak alkali exposure are less damaging, but prolonged contact with dioctyl phthalate plasticizer can soften the styrene-acrylonitrile phase and lower Vicat softening temperature by 3–6°C.

The base ABS 700 compound can be supplied with a compliance declaration covering the European Union RoHS Directive 2011/65/EU Annex II restrictions for lead, mercury, cadmium, hexavalent chromium, PBB and PBDE. The converter is responsible for verifying the final assembled article, because pigments, regrind from post-industrial sources, flame-retardant additives, and process aids may alter compliance status. Under REACH EC 1907/2006, the grade is generally regarded as an article once injection moulded, but suppliers must communicate substances of very high concern above 0.1 wt% per occurrence. Food-contact use of ABS 700 is not implied by this text; migration testing under relevant national food-contact regulations must be performed on the finished component. The grade should not be blended with polyamide or amine-based chemical blowing agents where moisture condensation at processing temperatures can generate ammonia and cause surface deposits on polished cavities.