INEOS Styrolution India ABS ABSOLAC 5000 is an unfilled acrylonitrile-butadiene-styrene injection-molding grade. The material is a two-phase system in which grafted polybutadiene rubber particles are dispersed within a continuous styrene-acrylonitrile copolymer matrix. The rubber phase contributes notched impact absorption and low-temperature ductility, while the SAN matrix controls tensile stiffness, melt viscosity, and surface hardness. Manufacturer-published typical property values locate the melt volume-flow rate near 20 cm³/10 min at 220 °C and 10 kg under ISO 1133-1, tensile yield stress at 44 MPa under ISO 527-2, Charpy notched impact strength at 20 kJ/m² at 23 °C under ISO 179-1/1eA, and Vicat B50 softening temperature near 96 °C under ISO 306. Density is approximately 1.05 g/cm³ under ISO 1183-1. These figures are typical release data and should not be used as a certificate of analysis for a specific lot.

ABSOLAC 5000 is specified for injection-molded components that require a reproducible balance between flow length and impact resistance, including small appliance housings, electrical enclosures, vacuum cleaner bodies, automotive interior trim, and office equipment covers. The grade is generally suited to wall sections between 1.5 mm and 3.0 mm. Published data for continuous load-bearing configurations are limited, and creep performance must be evaluated under the specific service temperature and stress state before specification.

What processing constraints dominate ABSOLAC 5000 in thin-wall injection molding?

Thin-wall cavity filling with ABSOLAC 5000 is governed by melt temperature, moisture content, gate freeze-off time, and shear-induced temperature rise. Desiccant-bed pre-drying at 80 °C ± 5 °C for 2–4 hours is required to reduce residual moisture to less than 0.10% by ISO 15512; processors operating at ambient relative humidity above 60% commonly require hopper dryers with a dew point not higher than -30 °C. If the moisture limit is exceeded, splay, silver streaking, and loss of Charpy notched impact are observed, particularly on hydraulic presses without closed-loop pressure correction.

Melt temperature measured at the nozzle is typically maintained between 230 °C and 250 °C. At melt temperatures below 220 °C, the flow length/wall thickness ratio of the grade drops sharply, and packing of ribs and bosses becomes inadequate. At melt temperatures above 270 °C, thermal degradation of the polybutadiene phase forms chromophoric by-products, yellowing, and a measurable reduction in notched impact strength. Screw speed should be limited to a surface velocity of 30–80 m/min on a 20:1 L/D general-purpose screw; higher speeds can raise the melt temperature by 8–12 °C through viscous dissipation. Back pressure of 3–10 bar hydraulic is sufficient to homogenize melt, while higher back pressure increases residence time and thermal history. Mold temperature is held at 40–80 °C, with the upper end preferred for gloss and weld-line ductility.

Rubber-phase morphology, Charpy thresholds, and slow-crack resistance

ABSOLAC 5000 derives its notched impact response from the rubber-particle size distribution and grafted SAN content at the rubber-matrix interface. Under ISO 179-1/1eA notched Charpy testing at 23 °C, typical release values near 20 kJ/m² reflect a stable craze and shear-yield mechanism. At -30 °C, impact retention depends on the polybutadiene glass transition temperature and on processing-induced rubber crosslink density; published data for this specific grade at sub-ambient temperature are limited, and molders should not substitute room-temperature impact data for low-temperature service validation.

Tensile yield stress under ISO 527-2 is reported near 44 MPa, with tensile modulus in the 2100–2400 MPa range. Flexural modulus under ISO 178 is commonly reported near 2200 MPa. These values position the grade as a medium-rigidity ABS. The elongation at break is typically higher than that of mineral-filled ABS but lower than that of high-viscosity extrusion ABS. Because ABSOLAC 5000 is a multiphase resin, the relationship between injection speed and rubber-phase orientation matters: high injection speeds produce frozen-in orientation, which can reduce notched impact in weld-line zones by as much as 20–30% relative to unfused bulk material. Weld-line strength should be measured on an end-gated tensile specimen under ISO 527-2 rather than inferred from bulk mechanical data.

Slow-crack resistance under environmental stress cracking is lower than that of polycarbonate/ABS blends. In applications involving repeated thermal cycling or exposure to stress concentrations at bosses and snap-fits, the design should maintain the maximum tensile stress below the material’s creep-rupture threshold. Published design stress data for ABSOLAC 5000 under long-term loading are limited.

When regrind fraction exceeds 20 wt% in ABSOLAC 5000 feedstock

Regrind addition modifies the molecular weight distribution and rubber-particle morphology of ABSOLAC 5000. At regrind fractions at or below 20 wt%, impacts on melt volume-flow rate and notched Charpy are generally minor if regrind is dried to the same moisture specification as virgin resin. Above 20 wt%, hydrolysis of SAN and oxidative degradation of the polybutadiene phase can reduce notched impact by 10–25% and increase MVR by 10–20% relative to virgin material. These ranges are process-history dependent, not fixed material limits.

Repeated granulation increases the fraction of fines, which melt later in the plastication unit and can produce unmelted rubber agglomerates visible as surface pits. Production-scale experience on 80–130 t injection machines indicates that a regrind/virgin blend should be tumbled in-bulk rather than metered as separate streams when the regrind content exceeds 15 wt%. The feed throat temperature should be limited to 40 °C to avoid premature softening of regrind particles that can cause irregular metering.

In product selection, ABSOLAC 5000 occupies an intermediate position between high-flow injection-molding ABS grades and high-heat ABS grades. High-flow ABS candidates with MVR values above 30 cm³/10 min at 220 °C/10 kg often fill long, thin-wall parts at lower injection pressures, but they exhibit lower notch impact and lower Vicat softening temperature. High-heat ABS grades with Vicat B50 values above 100 °C withstand higher continuous service temperatures, but they require higher melt temperatures and longer cooling cycles, and they may have reduced flow length at the same injection pressure. ABSOLAC 5000 is therefore selected when the application demands neither the extreme flow of high-flow grades nor the thermal capability of high-heat grades, but a controlled balance of both.

Compared with electroplating-grade ABS resins, ABSOLAC 5000 is not optimized for chromic acid etch uniformity or electroless metal adhesion. Electroplating ABS grades often use a controlled butadiene particle size distribution and a SAN composition that yields selective etching of rubber domains to provide mechanical anchoring for metal deposits. Metal adhesion on ABSOLAC 5000 must be validated by thermal cycling and peel tests under ISO 2819 or equivalent internal standards before electroplating is specified. Against high-gloss ABS grades, ABSOLAC 5000 may require higher mold polish and higher mold temperature to reach similar surface gloss; the grade is not the first choice for piano-black or high-reflectance uncoated surfaces unless gas-assist or rapid heat/cool cycling is used.

For painted parts, adhesion of solventborne coatings depends on surface preparation and solvent selection. Flame or corona pretreatment may be required if silicone-based mold release agents are present. Published data for this specific configuration are limited, and paint adhesion should be tested under ISO 2409 cross-cut method after aging at the service temperature.

Chemical contact with appliance lubricants and automotive cleaners

ABSOLAC 5000 is moderately resistant to aqueous acids, alkalis, and many aliphatic hydrocarbons, but it is not resistant to ketones, esters, aromatic hydrocarbons, and chlorinated solvents. In appliance applications, exposure to mineral oils and greases at temperatures below 60 °C can be tolerated for short service intervals, but continuous contact may plasticize the SAN matrix and reduce notched impact. Automotive interior cleaners containing ethanol or isopropanol at concentrations above 10% can induce environmental stress cracking at molded-in stress concentrations. Validation should include exposure to the actual formulation at 40–70 °C for 500 h followed by notched Charpy and tensile testing, with acceptance criteria defined by the end-use specification.

Because ABSOLAC 5000 is an unfilled ABS grade, it is not suitable for under-hood applications requiring continuous oil contact above 100 °C or for continuous immersion in brake fluid, fuel, or coolant. The grade should not be combined with amine-based flame-retardant additives unless the compound has been revalidated, because some amine synergists can adversely affect SAN thermal stability. Processing equipment used for rigid PVC should be purged thoroughly before ABSOLAC 5000 is introduced, as residual chlorinated species can corrode screw and barrel and contaminate the melt.

When regulatory compliance documentation is required for ABSOLAC 5000

Regulatory compliance for ABSOLAC 5000 is grade-specific and lot-specific. The resin is commonly assigned to the ABS classification under ISO 1043-1. Flammability is typically rated HB under UL 94 at 1.5 mm thickness; specific thickness-dependent ratings must be verified against the manufacturer’s UL Yellow Card. The base polymer is not formulated with intentionally added lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers; RoHS compliance under 2011/65/EU is confirmed by supplier declaration for the finished component. REACH SVHC disclosure under EC 1907/2006 is limited to substances present above 0.1 wt% in the delivered product. Food-contact suitability is not automatic: FDA compliance under 21 CFR 177.1020 depends on the final component construction, additives, and end-use temperature. Medical-grade or pharmaceutical-grade use requires separate validation.