Qingdao Haier New Material ABS RF1020G10 is an acrylonitrile-butadiene-styrene copolymer grade supplied by Qingdao Haier New Material Co., Ltd. The alphanumeric identifier RF1020G10 is a supplier-specific designation; it does not translate directly to a generic classification under ISO 19062-1:2015, which describes ABS moulding and extrusion materials by a defined property sequence. The controlling technical documents are the manufacturer’s technical data sheet, certificate of analysis, and safety data sheet. In appliance manufacturing, the grade is specified for injection-moulded refrigerator liners, door panels, and internal structural parts in which surface gloss, low-temperature impact resistance, and dimensional stability are jointly required. The material consists of a styrene-acrylonitrile continuous phase and a dispersed polybutadiene rubber phase. The rubber particle size distribution and graft morphology determine the balance between melt flow, impact strength, and environmental stress-cracking resistance. Thin-wall sections of 1.8 mm to 3.0 mm are typical for liner applications, but the exact numerical properties should be read from the supplied certificate of analysis because published data for this specific configuration is limited.

Because ABS grades are compared across multiple test methods, the procurement specification for RF1020G10 should fix the test method, specimen geometry, conditioning state, and acceptance limits. Melt mass-flow rate is determined under ISO 1133-1:2022 at 220 °C with a 10 kg load. Density is determined under ISO 1183-1:2019. Tensile yield stress and nominal tensile strain at break are measured under ISO 527-2:2012 or ASTM D638-14. Flexural modulus and flexural strength are measured under ISO 178:2019. Notched impact strength is measured under ISO 179-1:2010 or ASTM D256-10. Vicat softening temperature is measured under ISO 306:2022 using the 50 N load and 50 °C/h heating rate. Surface gloss is measured with a 60° gloss meter according to ISO 2813:2014. Values obtained after conditioning at 23 °C and 50% relative humidity under ISO 291:2008 may differ from values obtained after accelerated ageing. Cross-vendor comparisons are valid only when identical methods and specimen preparation procedures are applied.

How Should RF1020G10 Be Dried Prior to Melt Processing?

Moisture control is a critical processing boundary. A desiccant dryer with a dew point of -30 °C or lower is recommended. Drying at 80–90 °C for 2–4 h lowers moisture to below 0.1%. In production areas with relative humidity above 60%, drying time is extended to 4–6 h and dried material is transferred by closed conveying to prevent moisture regain. Residual moisture above 0.05% produces splay, silver streaks, and blisters on large-area panels. Direct hot-air hopper dryers are not recommended in high-humidity plants because they cannot reliably achieve the required dew point. Regrind should be dried separately or with extended residence time, as comminuted material has greater surface area and absorbs moisture faster. Drying beyond 6 h at 90 °C can accelerate oxidative yellowing of the butadiene phase and should be avoided. Measured moisture content can be verified by Karl Fischer titration according to ISO 15512:2019.

For injection moulding of large-area parts, a reciprocating single-screw machine with screw L/D ratio between 18:1 and 22:1 and compression ratio between 2.0:1 and 2.5:1 is generally employed. The barrel zone temperatures are set from feed to nozzle at approximately 210 °C, 220 °C, 230 °C, and 240 °C; nozzle temperature is held between 230 °C and 250 °C. Mould temperature is controlled between 40 °C and 70 °C. Lower mould temperatures reduce cooling time but increase frozen-in stress and can reduce surface gloss; higher mould temperatures improve replication of polished steel but extend cycle time. Back pressure is maintained between 0.5 MPa and 1.5 MPa, and screw rotation speed is usually set between 50 min⁻¹ and 100 min⁻¹. Injection speed is adjusted to produce a fill time of 1.5 s to 3.0 s for thin-wall panels; hold pressure is started at 50–70% of peak injection pressure. Clamp force is determined by projected area and flow length. Large refrigerator liners may require clamp force from 1,200 t to 2,000 t, although optimised low-pressure injection can reduce this requirement. Test specimens used for thermal and mechanical testing are moulded under ISO 294-1:2017; any deviation from the standard preparation procedure should be recorded on the inspection report.

Melt viscosity data generated by capillary rheometry under ISO 11443:2021 between 100 s⁻¹ and 10,000 s⁻¹ are required for computer-aided mould-filling simulation. The power-law viscosity parameters determined at 220 °C and 240 °C are used to predict gate balance and maximum injection pressure. For RF1020G10, the shear-thinning behaviour is typical of ABS: apparent viscosity falls as shear rate increases, but the slope changes with rubber-phase content. Processors should not extrapolate melt mass-flow rate to high shear rate flow; flow length is best evaluated by injection of a spiral mould at the same nominal wall thickness as the production part. In production-scale validation, short-shot studies on the actual tool are preferred to laboratory spiral flow because gate geometry and cooling rate affect the result. If the tool has hot runners, the pressure drop through the manifold should be measured and subtracted from the total injection pressure to avoid exceeding the maximum available pressure.

After ejection, mould shrinkage for RF1020G10 should be determined according to ISO 294-4:2018 using a plaque of similar thickness. Shrinkage in flow direction and transverse direction may differ by 0.1–0.3%, and the difference tends to increase with rubber-phase content. Tool designers should apply a mould-filling simulation that includes pressure-dependent volumetric shrinkage; ABS is amorphous, so no crystallisation contribution exists. Post-mould shrinkage continues during the first 24 h at room temperature and can be accelerated by annealing at 70 °C for 2 h. Final part dimensions should be verified after conditioning, not immediately after ejection.

Low-Temperature Impact Behaviour Is a Key Differentiating Factor

The performance difference between RF1020G10 and general-purpose ABS becomes significant in notched impact tests at low temperature. Notched Izod values are commonly reported at 23 °C and -30 °C according to ASTM D256-10; for appliance liners, the low-temperature result is more relevant because refrigeration compartments operate below 0 °C and the material must survive occasional impact during door closure and shelf adjustment. General-purpose ABS usually retains high impact resistance at ambient temperature but may undergo a ductile-to-brittle transition between -20 °C and -10 °C. Refrigeration-grade ABS formulations are adjusted with higher rubber-phase content or controlled particle size distribution to shift the transition below -30 °C. The resulting trade-off is a reduction in melt flow and a slight reduction in surface hardness. RF1020G10 is selected when the manufacturer’s lot data confirm low-temperature notched impact values above the acceptance threshold specified by the end-user. Because a single Izod value does not capture crack propagation under continuous stress, the processor should also evaluate environmental stress-cracking resistance in the presence of the actual insulation foam blowing agent. A constant-strain flexural test at -10 °C for 24 h is often used to discriminate between grades; no single ISO method covers all blowing agent combinations. Published data for RF1020G10 in such a test is limited, so the foam blowing agent type and part radius must be reviewed with the material supplier before tooling release.

When RF1020G10 Replaces Standard ABS in Thin-Wall Refrigerator Liners

Replacement of a standard ABS in an existing liner tool requires comparison of melt viscosity, shrinkage, and thermal diffusivity, not only the datasheet properties. Thin-wall refrigerator liners are often moulded at wall thicknesses below 2.5 mm and involve long flow lengths; an excessively viscous melt may require high injection pressure and produce gate blush or delamination. RF1020G10 is evaluated by spiral flow length at 220 °C or by short-shot studies on the production tool. Mould-filling simulation requires shear-rate-dependent viscosity data obtained by capillary rheometry under ISO 11443:2021; the simulator input should not rely solely on melt flow index. The grade also differs from standard ABS in its stabiliser package for reduced odour and fogging in closed appliance interiors. This property is assessed by headspace gas chromatography under VDA 278:2019 or an equivalent automotive interior method, but refrigerator-specific odour panels may also be used. When replacing a standard ABS, the processor should compare ejection force and surface hardness: a high-rubber formulation can exhibit greater post-mould shrinkage anisotropy and lower scratch resistance. Part dimensions should be verified after 48 h of storage at 23 °C to capture post-shrinkage before approval.

Compared with flame-retardant ABS, RF1020G10 should not be assumed to carry any UL 94 flame-class designation unless the supplier’s yellow card lists the exact thickness. Many appliance liner grades are not flame retardant. Adding halogenated or phosphorus-based flame retardants to RF1020G10 is not recommended without reformulation; such additives can reduce melt stability, increase plate-out, and lower low-temperature impact. Compared with ABS/PC blends, RF1020G10 is an ABS, not an ABS/polycarbonate alloy. ABS/PC blends often require mould temperatures of 80–120 °C and display higher toughness over a wider temperature range, but material cost is higher and flow length may be shorter. RF1020G10 can be processed at the lower mould temperatures described above, which reduces energy consumption and tool conditioning time, but its continuous-use temperature under load is lower. Applications above 90 °C require confirmation by heat deflection temperature testing under ISO 75-2:2013 at 1.8 MPa. The choice between RF1020G10 and an ABS/PC blend is therefore driven by required service temperature, cost, and tool thermal capacity.

In high-gloss liner production, colour compounding for refrigerator liners often includes white, off-white, or custom tints. The whiteness index and yellowness index are measured under ASTM E313-20. Use of a universal masterbatch can lower Vicat softening temperature and affect low-temperature impact. The masterbatch carrier resin should be an ABS or compatible styrenic; polyethylene-based masterbatch is incompatible and leads to surface defects. This requirement is particularly relevant when RF1020G10 is used in thin-wall tools with high surface-to-volume ratios, where pigment dispersion defects become visible as streaks or colour streaks at flow fronts.

Thermal Stability Limits, Regrind Reuse, and Incompatible Additives

Melt temperature should not exceed 250 °C for prolonged periods. Residence time at melt temperature should be kept below 3 min to limit degradation of the polybutadiene phase. Hot runner systems should be set to a manifold temperature not exceeding 240 °C, and hot runner tip temperature should be monitored by infrared pyrometry. Degradation is observed as yellowing, loss of impact, and an increase in free styrene and acrylonitrile in melt emissions. Regrind addition is governed by part performance requirements. For non-appearance components, regrind levels up to 20% are commonly accepted; for high-gloss liners, regrind should be limited to 10% or eliminated unless gloss retention and whiteness index are statistically validated. Higher regrind percentages increase batch-to-batch variance in melt viscosity and may reduce low-temperature impact because the polybutadiene phase crosslinks during repeated thermal histories. Regrind should be dust-free and free of contamination from other resins; polyolefin contamination causes surface delamination and gloss defects. Incompatible additives include high levels of unmodified polyolefin lubricants, phthalate plasticisers, and amine-based antistatic agents, which can accelerate degradation or create plate-out. Solvent cleaning of moulds and extraction tooling with ketones or aromatic hydrocarbons should not be performed while parts are in the press; acetone and methyl ethyl ketone are aggressive to ABS and can induce environmental stress cracking. Isopropanol or a specified mould cleaner should be used.

Specification Traceability and Regulatory Documentation

Grade code alone is insufficient for regulatory confirmation. For European Union supply, a REACH registration number should be documented on the safety data sheet under REACH Regulation (EC) No 1907/2006; the supplier declaration should confirm whether the product contains substances of very high concern above the Article 33 communication threshold. For electrical and electronic equipment, the material must be screened against the restricted substances listed in RoHS Directive 2011/65/EU Annex II. For food-contact appliance components, the grade requires migration verification against FDA 21 CFR 177.1020 for acrylonitrile-butadiene-styrene copolymers and, where placed on the EU market, against Commission Regulation (EU) No 10/2011. The following matrix identifies the documentation normally required before production release.

Conformance must be established by lot testing or supplier declaration, not by grade-code inference. The certificates of analysis should include the production date, the test method designations used, and the measured values for each agreed specification. Any colour masterbatch or processing aid introduced by the moulder can shift melt flow, impact, and regulatory behaviour, and therefore should be disclosed to the material supplier and end-user.