Hangzhou Jufeng ABS CA-7010-LG is an acrylonitrile-butadiene-styrene terpolymer grade supplied in pellet form for injection moulding operations. The designation CA-7010-LG is manufacturer-specific; CA indicates the ABS family, while LG may denote a controlled light-grey base tint or a low-gloss surface, but the exact mill definition must be confirmed against the supplier’s certificate of analysis because published data for this specific configuration is limited. Typical end-use applications include indoor appliance trim, electrical enclosures, office equipment housings, and consumer goods requiring a balance of stiffness, notched impact resistance, flow length, and dimensional repeatability. Product reliability is not inferred from the base polymer class alone; it depends on verification of melt volume-flow rate, notched impact, heat deflection temperature, mould shrinkage, and flammability class under current ISO and ASTM methods before tool construction.

What Does the CA-7010-LG Data Sheet Require Before Tool Design?

Because the manufacturer does not publish an openly archived datasheet for the CA-7010-LG designation, tool and process engineering should proceed from the supplier’s lot certificate and a minimum property verification matrix. For high-flow ABS injection grades such as those covering appliance and enclosure applications, the property envelope typically falls within the ranges shown in Table 1. These ranges are not substitutes for the supplier’s certified values; they are the engineering window within which unfilled ABS grades of this class are evaluated under ISO protocols.

Table 1 values must be read with injection-moulding compatibility limits. The melt viscosity at the shear rates used in a reciprocating screw machine is not constant, and the ISO 1133-1:2022 single-point MVR value is insufficient to predict thin-wall filling pressure. For CA-7010-LG, a multi-point capillary rheometry sweep from 100 s⁻¹ to 5000 s⁻¹ should be used when wall sections fall below 1.2 mm. A high MVR alone may conceal low melt strength, causing jetting at the gate and weld-line weakness.

Moisture control is the first processing boundary for this grade. ABS absorbs moisture in humid storage, and residual moisture above 0.1 % by weight produces silver streaks and splay at the gate. CA-7010-LG should be dried in a desiccant dryer with a dew point of -30 °C or lower, at 80–90 °C, for 2–4 h. In production areas where relative humidity exceeds 60 %, the residence time is extended to 4–6 h and dry-air flow is set to at least 3.7 m³/h per kg/h of polymer throughput. Overdrying beyond 6 h at 90 °C or hot-air exposure above 95 °C can oxidize the butadiene rubber phase and induce yellowing. The melt-temperature ceiling is 260 °C; barrel settings from the rear zone to the nozzle are typically maintained at 190–210 °C, 200–220 °C, 210–230 °C, and 220–240 °C. Residence time in the barrel should remain below 10 min; if the machine cycles are interrupted, the barrel should be purged with a low-viscosity ABS or SAN purge compound.

At temperatures above 260 °C, the polybutadiene phase undergoes free-radical crosslinking and chain scission. The visible consequence is yellowing, black specks, or a reduction in notched impact even when tensile properties remain acceptable. Injection moulders monitor the melt stream with a flush-mounted melt thermocouple or an infrared melt-temperature probe and record nozzle temperature, not just barrel set points, because shear heating in the check ring and screw tip can exceed set point by 10–20 °C at high back pressure.

Melt Temperature, Screw Configuration, and Shear Limitations During Injection

An ordinary general-purpose ABS screw with an L/D ratio of 20:1 to 24:1 and a compression ratio of 2.0:1 to 2.5:1 is suitable. Low-compression PET or PVC screws are not recommended because they generate insufficient melt quality; high-compression or high-shear screws may elevate localized shear near the non-return valve above 10 000 s⁻¹. Injection speed is set to produce a fill time of 0.5–1.5 s for wall sections of 1.0–2.5 mm. Holding pressure is accepted at 60–80 % of peak injection pressure, and back pressure is held at 0.5–1.0 MPa to maintain melt homogeneity without excessive shear heating. The mould cavity is controlled with a circulating water unit at 40–70 °C; elevated cavity temperature up to 80 °C improves knit-line strength but increases cycle time and can increase post-mould shrinkage. Cavity temperature below 30 °C is associated with greater residual stress and lower impact strength at sharp corners.

Thin-wall moulding below 1.0 mm introduces a processing window narrower than ±5 °C in melt temperature because both short shots and butadiene-phase degradation occur at opposing limits. Mould filling simulation using a Cross-WLF viscosity model is recommended; the modelled pressure at the last fill point should be held below 80 MPa to prevent flash and shear-induced splay. Gates should be placed away from visible surfaces where possible, and gate diameter should be at least 0.8 times the wall thickness to reduce gate blush. Vents of 0.02–0.03 mm depth on the parting line prevent dieseling and burn marks at the end of fill.

Comparative Differentiation Against High-Gloss, Electroplating, Heat-Resistant, and Flame-Retardant ABS

The CA-7010-LG designation differs from specialty ABS grades in composition and property profile. Table 2 summarizes the relevant class-level differences; values in the table are typical ranges for the class, not certified values for CA-7010-LG unless the supplier’s certificate confirms them.

The clearest operational difference appears in plating and flame-retardant uses. General-purpose ABS such as CA-7010-LG cannot be transferred to electroplating without an adhesion trial; electroplating ABS is defined by its rubber morphology, not by paint adhesion or solvent bonding alone. Flame-retardant grades achieve their rating by increasing the char yield or scavenging free radicals, but these additives reduce melt stability and force lower barrel temperatures. CA-7010-LG, if unmodified, does not carry halogenated flame retardants and therefore retains a wider melt-temperature window, but it cannot be used where UL 94 V-0 is required unless converted to a certified flame-retardant variant or protected by design.

Compared with heat-resistant ABS, the styrene-acrylonitrile matrix of CA-7010-LG is not typically modified with alpha-methylstyrene; therefore, continuous service near 95 °C can produce creep and loss of clamp force in snap-fits. For applications with brief excursions to 100 °C, prototype testing under ISO 178:2019 flexural creep and ISO 899-1:2017 tensile creep is advised. When high-gloss surface aesthetics are required, CA-7010-LG should be checked under ISO 2813:2014 and compared with the tool polish specification, because low-gloss or light-grey grades may require texture depth adjustments to hide weld lines and sink marks.

Chemical resistance boundaries for CA-7010-LG follow the ABS class. Aromatic hydrocarbons, ketones, esters, and chlorinated solvents can induce environmental stress cracking, especially at moulded-in stress concentrations. For enclosures that contact mild oils or aliphatic hydrocarbons, prototype testing under ISO 22088-2:2006 is required. Solvent-wipe cleaning of moulded parts should be avoided unless the solvent is an approved aliphatic hydrocarbon or water-based cleaner verified by the supplier. Because ABS contains unsaturated butadiene, CA-7010-LG is not specified for long-term outdoor UV exposure without painting or UV stabilization; weathering validation is performed under ISO 4892-2:2013 or ASTM G155 when exterior use is proposed.

When Regrind Is Blended with CA-7010-LG in Production

Regrind incorporation is permitted if controlled. Sprues and runners from CA-7010-LG should be collected from closed-loop systems, ground to a particle size below 6 mm, and dried under the same conditions as virgin pellets. A regrind fraction of 10–20 % by weight is accepted in general-purpose ABS processing without significant loss of tensile yield. Above 20 %, repeated heat history consumes the butadiene-phase stabilizer, and the notched impact may decrease while melt viscosity may become less uniform. Oversized granulate above 6 mm can bridge at the hopper throat; a feed-zone temperature reduction of 5–10 °C is used when the regrind fraction exceeds 20 % to prevent premature softening.

If colour concentrate or masterbatch is introduced, the carrier resin must be SAN or ABS-compatible. Polyethylene, nylon, or other incompatible carriers create delamination because they do not develop interfacial adhesion with the styrene-acrylonitrile matrix. Letdown ratio is maintained at 2–4 % for conventional colour concentrates; higher loadings require a pre-dried masterbatch and may shift the MVR by 5–10 %. The addition of metallic, pearl, or mineral-filled masterbatches changes the thermal diffusivity and notch sensitivity of the moulded part; therefore, the base impact data in Table 1 cannot be used directly after pigmentation without re-testing. Additives that contain free amines, including some antistatic or oxygen-scavenging masterbatches, should be avoided unless the supplier has validated the combination, because basic nitrogen groups can accelerate degradation of the acrylonitrile sequence and shift the colour.

Batch release inspection for CA-7010-LG should include density, melt volume-flow rate, Charpy notched impact, tensile yield, Vicat, and flammability class where enclosure standards apply. The specimen preparation is governed by ISO 294-1:2017; tensile testing follows ISO 527-2:2012; impact testing follows ISO 179-1:2020; flammability class is confirmed according to UL 94. Incoming lots with a melt volume-flow rate outside the agreed range should be segregated and subjected to a capillary rheometer sweep before being cleared for thin-wall production. Conversely, a lot that passes single-point MVR but shows higher Charpy scatter may still produce acceptable parts; the critical response is lot-to-lot viscosity stability, not absolute value alone.