Mocom ALCOM ABS+SAN A 1000/100 SV2067-06MCF is an amorphous thermoplastic compound in which an acrylonitrile-butadiene-styrene matrix is combined with a styrene-acrylonitrile copolymer. The alphanumeric segment A 1000/100 identifies the base compound series and flow classification. The suffix SV2067-06MCF designates a specific color and formulation variant within the Mocom ALCOM color system. The material is supplied as pellets and is differentiated from natural ABS/SAN grades by pre-compounded pigmentation. Pre-compounded color eliminates press-side masterbatch dosing but narrows the residence-time and shear limits during melt preparation.

Lot-specific datasheets control the release values for density, melt volume-flow rate, tensile properties, impact resistance, and heat deflection. Public reproduction of certified values for this exact color formulation is limited. The following treatment uses standardized test methodologies and the documented performance envelope of unfilled ABS/SAN blends. Where product-specific data are not published, that absence is stated rather than filled with unverified values.

What Thermal and Shear Boundaries Govern Drying, Melt Preparation, and Injection Molding?

Moisture management is the principal process constraint. The compound is dried in a desiccant dryer at 80 °C for 2 h to 4 h. The air dew point should be no higher than -20 °C, and the residual moisture target is below 0.02 wt%. Moisture above this threshold hydrolyzes the SAN phase during plastication and produces splay, silver streaks, and gloss reduction on part surfaces. In hopper dryers with long static residence, extended exposure above 4 h may induce yellowing and color drift in the SV2067-06MCF formulation. Karl Fischer titration is preferred over loss-on-drying for moisture verification.

Melt temperatures at the nozzle should be maintained between 220 °C and 250 °C. Barrel profiles typically descend from 210 °C in the feed zone to 240 °C in the metering zone. Mold temperature is controlled between 40 °C and 80 °C, with the upper half of this range improving weld-line strength and surface replication at the cost of cycle time. A general-purpose screw with an L/D ratio of 20:1 to 25:1 and a compression ratio of 2.0:1 to 2.5:1 is adequate for homogeneous melt preparation.

Rheological characterization under ISO 1133-1:2022 is commonly reported as melt volume-flow rate. For unfilled ABS/SAN grades in the A 1000/100 flow class, public literature places MVR values between 18 cm³/10 min and 26 cm³/10 min at 220 °C and 10 kg. Shear viscosity decreases with increasing shear rate. The melt elasticity of ABS/SAN is lower than that of high-rubber ABS, which reduces die swell and improves dimensional stability in thin-wall filling but also limits melt strength in blow molding and thick-wall profile extrusion.

Mechanical Property Windows and Competing Amorphous Blends

Specimen preparation follows ISO 294-1:2017 and ISO 20753:2018. Tensile testing is conducted to ISO 527-2:2012, flexural testing to ISO 178:2019, and notched Charpy impact testing to ISO 179-1:2010. For unfilled ABS/SAN blends, tensile modulus is generally reported between 2,300 MPa and 2,700 MPa; tensile yield stress is typically 40 MPa to 50 MPa; elongation at yield is below 3%. Notched Charpy impact at 23 °C is usually between 8 kJ/m² and 15 kJ/m². The SV2067-06MCF color package may shift these values downward relative to natural compound, particularly in impact properties, so the manufacturer’s color-specific datasheet must be used for design calculations.

The product occupies an intermediate position. Compared with unmodified SAN, the ABS fraction improves crack initiation resistance and notched impact. Compared with impact-modified ABS, the SAN-rich blend generally exhibits higher surface hardness, lower rubber-phase deformation, and reduced notched impact. Compared with PC/ABS, the ABS+SAN system has lower Vicat softening temperature and lower multi-axial toughness, but it offers easier flow and lower compound cost in non-structural housings. Compared with ASA, the ABS+SAN system has poorer long-term outdoor gloss retention because the butadiene phase undergoes photo-oxidation; unpainted exterior parts are outside the normal application boundary.

Vicat softening temperature under ISO 306:2022 method B50 for unfilled ABS/SAN blends is commonly reported between 95 °C and 105 °C. Heat deflection temperature under ISO 75-2:2013 method B is typically 5 K to 10 K lower. Continuous use above 80 °C in load-bearing geometries should be validated by creep and thermomechanical testing rather than by single-point heat deflection data.

Color-specific processing constraints are more severe for the SV2067-06MCF designation than for natural resin. Pre-compounded color eliminates lot-to-lot metering variation associated with press-side masterbatch, but it also means that excessive shear can damage pigment dispersion and create visible streaking. Screw surface speed should be limited to approximately 0.3 m/s, and hydraulic back pressure should be held between 5 MPa and 10 MPa. If the formulation contains effect pigments, the supplier’s recommended screw geometry and gate size should be followed; abrupt transitions and small gates increase shear heating and may produce flow marks.

Application selection for this grade is restricted to indoor, non-load-bearing and low-to-moderate thermal environments. Representative uses include appliance bezels, personal care housings, office equipment covers, consumer electronics enclosures, and light-duty automotive interior trim that is not exposed to direct sunlight. The material is not specified for safety-critical structural components, underhood parts, or unpainted exterior panels because the butadiene phase and the SAN matrix do not provide long-term UV stability or continuous-load creep resistance at elevated temperature.

Stress Cracking Is Accelerated by Solvent Contact in ABS/SAN Systems

The butadiene phase and SAN phase respond differently to chemical environments. Aromatic hydrocarbons, chlorinated hydrocarbons, esters, and ketones are aggressive toward ABS/SAN systems and should not be used as cleaning agents or process aids. Mineral oils, plasticizers, and certain citrus-based cleansers can reduce notched impact and promote environmental stress cracking. Chemical compatibility should be evaluated under constant tensile load or bent strip methods described in ISO 22088-2:2006 and ISO 22088-3:2006. Mold-release agents and assembly greases must avoid phthalate and cinnamate derivatives that plasticize the SAN matrix.

When Regulatory Documentation Supersedes Mechanical Selection

The grade must be evaluated against substance-control obligations before shipment into end markets. Compliance is established through supplier declarations rather than through the polymer chemistry alone. The table summarizes the threshold documents that processors commonly request for ABS/SAN compounds.

Production-scale experience with precolored ABS/SAN compounds identifies gate blush, jetting, and weld-line weakness as recurring defects. Gate blush occurs when injection velocity is too high at small gate cross-sections; reducing velocity or increasing gate diameter is more effective than raising mold temperature alone. Jetting is minimized by positioning the gate so that the melt stream interrupts against a cavity wall. Weld-line strength in effect-pigmented grades is lower than in unfilled natural compound; weld lines should be positioned away from structural or impact-loaded regions. On injection molding machines with clamp force between 800 kN and 4,000 kN, shot size should be between 20% and 80% of barrel capacity to avoid long residence time. At melt temperature, residence time should not exceed 8 min. On hot-runner systems, internally heated nozzles require temperature overshoot protection. Local hot spots above 260 °C produce black specks and color drift. Purging after the run should use SAN or acrylic-based purge compound; PVC and acetal purges are incompatible because their degradation products can corrode hot-runner components and contaminate the melt stream.