CEVIAN® MABS E80, supplied by PlastxWorld, is a methyl methacrylate-acrylonitrile-butadiene-styrene terpolymer in pelletized form. The polymer architecture combines a methacrylate-modified styrene-acrylonitrile matrix with a discrete butadiene-based rubber phase whose refractive index is adjusted to maintain visible-light transmission. The E80 designation identifies a high-flow grade within the CEVIAN® MABS family, intended for thin-wall injection molding where melt viscosity at moderate barrel settings controls cycle time and dimensional stability. The material is distinguishable from general-purpose ABS by the presence of the methacrylate comonomer in the matrix and by the resulting optical clarity; it is distinguishable from PMMA by the inclusion of the butadiene rubber phase and by the associated increase in notched impact resistance. Because lot-specific certificates of analysis contain the controlling values, the following specification envelope is taken from typical published MABS class data and must not replace release documentation for a specific shipment.

What Specification Ranges Apply to the E80 Grade?

Typical specification values for a high-flow transparent MABS grade are summarized in Table 1. The ranges reflect equilibrium conditioning at 23 °C and 50 % relative humidity in accordance with ISO 291:2008 unless otherwise stated. The tensile stress at yield and tensile elongation at break are measured on Type 1A specimens according to ISO 527-2:2012; flexural modulus is determined by ISO 178:2019; notched Izod impact is reported from ISO 180:2023 using edgewise impact at 23 °C and −30 °C. The melt mass-flow rate is measured under 220 °C and 10 kg according to ISO 1133-1:2022, while heat deflection temperature and Vicat softening temperature are obtained under 1.82 MPa and 50 N, respectively, following ISO 75-2:2013 and ISO 306:2022. Optical transmission and haze are measured on 3 mm injection-molded plaques according to ASTM D1003-21.

Predrying of CEVIAN® MABS E80 is mandatory before melt processing. The pellets are hygroscopic and equilibrium moisture uptake can exceed 0.1 % when stored in uncontrolled ambient conditions. A desiccant-bed dryer with a dew point of −40 °C or lower is specified; the drying hopper setpoint is 80 °C to 85 °C with a residence time of 3 h to 4 h. The moisture content at the feed throat should be maintained below 0.05 %. At relative humidity above 60 %, drying time should be extended to 4 h and the hopper-to-press transfer lines should be kept sealed. In production-scale material-handling observations, hopper bridging can occur if regrind exceeds 20 wt% without a stirred hopper; this is not a resin deficiency but a bulk-density variation issue. Regrind from sprues and runners can be reintroduced at 10–20 wt% with no measurable loss in Charpy impact when the regrind fraction is predried to <0.05 % moisture and the granulate is free of fines below 500 µm. Moisture analysis should be performed by Karl Fischer titration under ISO 15512:2019 when the drying setup is first qualified or when ambient conditions change seasonally.

When E80 Replaces PMMA in Transparent Covers and Housings

The substitution of PMMA with CEVIAN® MABS E80 is evaluated primarily on impact resistance, density, and melt-viscosity differences. PMMA typically exhibits a tensile modulus above 3000 MPa and a light transmittance near 92 %, but its notched Izod impact strength at 23 °C is commonly below 3 kJ/m². In contrast, the MABS class provides a notched Izod impact range of 8–15 kJ/m², which allows snap-fit designs and thin-walled enclosures to tolerate assembly stresses that would propagate cracks in PMMA. The trade-off is a lower modulus and surface hardness: MABS is more susceptible to scratching and is not a drop-in replacement for PMMA in applications requiring pencil hardness above H or prolonged outdoor UV exposure without a UV-protective cap layer. For medical device housings, ISO 10993-1:2018 biocompatibility evaluation must be performed on the finished component; the supplier should provide a lot-specific statement for the E80 formulation and color concentrate. For cosmetic packaging, contact with ethanol- and isopropanol-based formulations is generally tolerated at room temperature for short service periods, but continuous contact with ketones, esters, aromatic hydrocarbons, or chlorinated solvents is outside the recommended boundary. Published data for E80-specific solvent weight-gain coefficients is limited; qualification should include immersion testing per ISO 175:2010 for the exact fragrance or disinfectant chemistry.

Across the styrene-copolymer family, general-purpose ABS remains opaque because the polybutadiene rubber phase and the SAN matrix differ in refractive index. The methacrylate comonomer in MABS raises the matrix refractive index to match the rubber phase, producing a transparent part without eliminating the rubber phase. Polycarbonate offers higher heat resistance, with typical heat deflection temperature values in the 125–135 °C range under 1.82 MPa, and requires melt temperatures of 280–320 °C; CEVIAN® MABS E80 processes in the 230–260 °C melt-temperature range and therefore imposes lower energy input and shorter cooling requirements in thin-wall molding. The optical clarity of MABS is lower than PMMA but higher than many transparent ABS grades; haze levels in molded plaques are typically in the 1.5–3.0 % range at 3 mm thickness. These differences position E80 in applications where impact resistance, thin-wall flow, and transparency are required simultaneously, but not where continuous UV stability, high chemical resistance, or high heat deflection is the primary requirement.

Rheology, Drying, and Screw Design Boundary Conditions

The melt viscosity of CEVIAN® MABS E80 is controlled by the butadiene rubber content, the methacrylate comonomer ratio, and the molecular weight distribution. For injection molding, a general-purpose screw with L/D between 20:1 and 24:1 and a compression ratio of 2.0:1 to 2.5:1 is sufficient; a high-shear barrier screw is unnecessary for uniform melt quality at these viscosities. Barrel temperature profiles are typically set with the feed zone at 180–200 °C, the compression zone at 210–230 °C, and the metering zone/nozzle at 230–250 °C. Mold surface temperatures from 40 °C to 80 °C are used to balance surface replication and cycle time; lower mold temperatures reduce cycle time but increase molded-in stress, while higher mold temperatures reduce stress but extend cooling time. Back pressure is maintained between 0.5 MPa and 1.5 MPa to ensure homogeneous melt without excessive shear heating. Screw recovery speed should not exceed 0.3 m/s to avoid rubber-phase over-shear and surface splay. Decomposition becomes measurable above 270 °C at residence times exceeding 5 min; purging with an acrylic-grade purging compound or the intended production resin is advised after shutdown. On production-scale twin-screw extruders with L/D ≥ 40:1 used for compounding and pelletizing MABS, vacuum venting at −0.08 MPa gauge pressure is used to strip residual moisture and low-molecular-weight volatiles. For injection molders, clamp force should be selected on the basis of projected area and melt pressure; a melt-pressure-limited processing window rather than a clamp-force limit often governs the flow length in thin-wall parts.

Gate and weld-line placement controls optical quality in transparent MABS applications. Direct edge gates or fan gates with a land length below 1 mm are preferred over pinpoint gates because jetting creates flow marks that are visible in the final part. Weld lines are localized zones of reduced impact strength and visible optical distortion; their position should be moved to low-stress areas or away from sealing surfaces. Hot-runner systems should use thermally balanced manifolds with internal heating and no dead spots, because material stagnation above 250 °C can generate yellowed streaks. If a cold runner is used, runner diameter should be at least 80 % of the maximum wall thickness to avoid premature freeze-off. Part ejection should use large-area stripper plates or ejector pins with polished surfaces; surface roughness below 0.8 µm Ra on mold cavities is needed for high-gloss transparent surfaces. After molding, parts may be annealed at 70 °C to 80 °C for 2 h to relieve molded-in stress before solvent bonding or hard-coating; unannealed parts can exhibit solvent crazing when exposed to service fluids.

Compliance Statements for E80 Are Lot-Specific and End-Use-Dependent

Compliance claims for CEVIAN® MABS E80 are valid only when supported by the supplier-issued lot certificate and the final compound formulation, including colorants and processing aids. The base resin class is typically included in a RoHS screening program for the restricted substances listed in 2011/65/EU Annex II and the amending delegated directives. REACH compliance under 1907/2006/EC should be confirmed through the supplier's SVHC declaration under Article 33. For food-contact and medical applications, the final article manufacturer is responsible for compliance with the applicable end-use regulation; MABS should not be assumed to carry blanket approval. A request should include the polymer grade, color masterbatch identity, additive package, intended contact conditions, and part geometry. In the absence of these inputs, published data for E80-specific migration behavior is limited and cannot be substituted by generic MABS data. The material is not recommended for continuous outdoor exposure without UV stabilization because the butadiene rubber phase undergoes photo-oxidative degradation; a UV cap layer or UV stabilizer masterbatch is required for sustained weathering. The grade is also incompatible with certain amine-containing additives if used in melt compounding at high temperature, as alkaline species can promote rubber-phase degradation and surface haze.