Dongguan Yuejia Plastic ABS yj-001 is identified in supplier documentation as an acrylonitrile-butadiene-styrene injection moulding resin. The yj-001 designation is manufacturer-specific and separates the grade within the Dongguan Yuejia Plastic portfolio from glass-filled, heat-resistant, flame-retardant, high-gloss, and high-flow ABS variants. Publicly available datasheets for this exact designation are limited; therefore, batch-specific certificates of analysis and safety datasheets are the controlling documents for all production specifications. Values stated on this page are present only as general-purpose ABS process and property envelopes and do not replace the yj-001 certificate.

Because the material is a styrenic terpolymer, its continuous styrene-acrylonitrile copolymer phase carries tensile stiffness and chemical resistance, while the dispersed polybutadiene phase controls low-temperature impact behaviour. For a general-purpose injection grade such as yj-001, the balance between flow and impact is achieved by controlling rubber-particle size distribution and grafted SAN compatibility. Direct quantitative data for yj-001 rubber content are not provided in public literature, so incoming lots should be screened by melt rheology, density, and notched impact rather than relying on a nominal polybutadiene percentage.

Material Identity and Incoming Quality Control

Incoming inspection for yj-001 should first verify lot number, date of manufacture, and supplier certificate against the purchase specification. Density is determined under ISO 1183-1:2019; unfilled general-purpose ABS typically falls between 1.03 g/cm³ and 1.07 g/cm³. Melt mass-flow rate is measured according to ISO 1133-1:2022 at 220 °C with 10 kg load. General-purpose injection ABS often ranges from 15 g/10 min to 30 g/10 min. Tensile yield stress is evaluated under ISO 527-2:2012 using a Type 1A specimen at 50 mm/min; typical values for unfilled general-purpose ABS lie between 35 MPa and 50 MPa. Flexural modulus under ISO 178:2019 is typically reported between 1800 MPa and 2500 MPa. These intervals are industrial reference ranges, not yj-001 fixed limits.

Notched impact strength is a batch-sensitive indicator because it depends on polybutadiene domain size, cross-linking density, and SAN grafting efficiency. Under ISO 179-1:2023, notched Charpy impact at 23 °C for general-purpose ABS is commonly observed between 15 kJ/m² and 30 kJ/m². Under ASTM D256-10, notched Izod impact at 23 °C is often reported between 150 J/m and 300 J/m. The choice of test method affects the reported value, and comparisons between suppliers should not be made across different standards without a controlled cross-test programme.

Drying is a critical pre-processing step because residual moisture hydrolyses the acrylonitrile segment at melt temperature and produces splay, flow marks, and local loss of impact strength. A desiccant dryer with a dew point of −30 °C or lower is used. The resin is dried at 80 °C to 90 °C for 2 h to 4 h, provided the incoming moisture is below 0.05 %. In plants where ambient relative humidity exceeds 60 %, pre-drying is mandatory even for newly opened vacuum-packed lots, because opened bags can regain enough moisture to cause visible splay within 30 min to 60 min. Hot-air ovens without desiccant beds are not recommended for yj-001. Final moisture after drying should be checked by Karl Fischer titration or a calibrated loss-on-drying balance.

How Should the Injection Moulding Window Be Established for yj-001?

Process development should start from a general-purpose ABS envelope and then be narrowed using actual yj-001 lot rheology. The melt temperature is typically set between 210 °C and 250 °C. The lower region is selected for high screw-speed thin-wall moulding to limit residence time, while the upper region is used for long flow paths and high-gloss surfaces. The mould temperature is controlled between 30 °C and 70 °C. Higher mould temperature improves weld-line strength and gloss, but it increases cycle time and may raise sink marks in thick sections. Back pressure is maintained between 0.3 MPa and 0.7 MPa, and injection velocity should be profiled to eliminate jetting and gas entrapment. Hold pressure is usually set at 50 % to 70 % of peak injection pressure, with hold time determined by part weight stabilisation near gate freeze-off.

Residence time should not exceed 5 min at 250 °C. The barrel should be purged when downtime exceeds 15 min to 20 min because prolonged heating degrades the butadiene phase and causes yellowing. Screws with a compression ratio of 2:1 to 3:1 and an L/D ratio of 20:1 to 24:1 are commonly used for general-purpose ABS on reciprocating-screw injection machines. Shut-off nozzles are preferred to prevent drool and to maintain melt cushion consistency. Published data for the exact yj-001 processing window is limited, so the supplier’s technical data sheet should be requested before setting production limits.

A specific injection pressure of 80 MPa to 120 MPa on the melt is common for general-purpose ABS in a single-cavity cold-runner tool, depending on flow length-to-wall-thickness ratio. Clamp force should be sized so that cavity pressure does not exceed 70 % of available clamp. For technical parts with projected area above 200 cm², moulding trials should record cavity pressure curves to verify gate freeze time.

Gate location and part design interact with the yj-001 processing window. Unbalanced flow lengths greater than 2:1 across a multi-cavity tool create non-uniform packing and differential shrinkage. Weld-line strength in general-purpose ABS is typically 60 % to 80 % of the bulk tensile strength when weld lines are formed under adequate melt temperature and hold pressure. If weld lines are located in impact-loaded regions, the part should be validated with instrumented falling-weight impact under ISO 6603-2:2023, because static tensile data may not reveal local embrittlement. Hot-runner systems should use externally heated manifolds with no dead spots, and valve gates should be sequenced to eliminate flow-front hesitation.

Regrind addition for yj-001 requires validation because repeated heat history reduces unsaturation in the polybutadiene phase and lowers notched impact strength. For general-purpose ABS, regrind fractions up to 20 % by weight are used in non-load-bearing parts, but this threshold is not automatically valid for yj-001. Regrind should be free of fines, oil, dust, and mixed-colour flakes. If regrind is blended with virgin yj-001, the blend should be dried as a single lot and tested for melt mass-flow rate and notched impact against the original certificate. When tensile elongation at break above 10 % is required, regrind should be reduced or eliminated unless moulding-trial data prove equivalence.

When the Grade Is Compared with Other ABS Product Classes

Positioning yj-001 within the ABS product class requires separating general-purpose, high-impact, high-flow, heat-resistant, and flame-retardant grades. General-purpose ABS balances flow, stiffness, and impact for technical components that do not require continuous service above 95 °C. High-impact ABS grades contain increased polybutadiene content and typically show notched Izod impact values above 300 J/m at 23 °C under ASTM D256-10, but they exhibit lower tensile strength and greater mould shrinkage. High-flow grades are formulated with lower molecular weight SAN or lubricant packages to reach melt mass-flow rates above 30 g/10 min at 220 °C and 10 kg; this allows thin-wall filling but usually reduces impact and chemical stress-crack resistance. The table below summarises the positioning expected for yj-001, subject to certificate verification.

Published direct comparative data between yj-001 and named commercial equivalents is limited. When a material substitution is evaluated, comparison should not rely only on melt flow and tensile values. At least three lots should be tested for notched impact, heat deflection temperature under load, and mould shrinkage to determine whether the replacement can maintain critical dimensions and mechanical performance.

For yj-001 used in structural or semi-structural parts, tensile properties are measured under ISO 527-2:2012 using Type 1A specimens at 23 °C and 50 mm/min. Flexural properties are determined under ISO 178:2019. Heat deflection temperature is commonly evaluated under ISO 75-2:2020 Method A at 1.80 MPa; general-purpose ABS typically falls between 80 °C and 95 °C. Vicat softening temperature under ISO 306:2022 Method B50 often lies between 95 °C and 105 °C. These values are influenced by moulding stress, moisture content, and specimen conditioning, and should be checked against the yj-001 certificate before release of production parts.

Mould shrinkage for general-purpose ABS is commonly reported between 0.4 % and 0.7 % in the flow direction and between 0.4 % and 0.6 % transverse to flow when measured after 24 h at 23 °C under ISO 294-4:2018. Shrinkage increases with wall thickness, melt temperature, and mould temperature, and decreases with higher hold pressure and longer hold time. For precision parts, dimensional capability should be established with a Cpk of at least 1.33 across 30 consecutive shots after the process reaches steady state.

Rheological and Thermal Property Envelope for Production Release

Melt-flow data alone cannot capture shear-thinning behaviour at injection shear rates. For yj-001, capillary rheometry should be used when moulding complex geometries or when production uses a hot-runner system. General-purpose ABS at 220 °C and shear rates above 1000 s⁻¹ often shows apparent viscosity between 100 Pa·s and 250 Pa·s. These values are generic reference data; actual values should be obtained from the specific yj-001 lot because molecular weight distribution shifts can change the shear sensitivity without changing the melt mass-flow rate at low shear.

Thermal stability can be screened by thermogravimetric analysis under ISO 11358-1:2022. Unfilled ABS typically displays the main degradation onset above 300 °C, but the manufacturing requirement is more restrictive: the material should not be held above 250 °C for extended periods because impact loss occurs before mass loss is detectable. Capillary or melt residence tests on the actual grade are therefore more informative than TGA alone.

Before yj-001 Is Released to Production, Compliance Records Must Be Verified

Compliance for yj-001 should be established through supplier documents referencing the European RoHS Directive 2011/65/EU and its delegated amendments, REACH Regulation 1907/2006 candidate list, and, where applicable, FDA 21 CFR food-contact sections. The material should not be assumed to carry a UL 94 flammability classification unless the supplier provides a yellow card for that exact grade. For export markets requiring heavy-metal and phthalate screening, laboratory reports should include Cd, Pb, Hg, Cr(VI), PBB, PBDE, and the four priority phthalates under RoHS Annex II.

Storage for yj-001 should avoid direct sunlight and condensation. Bags should remain closed after use, and shelf life from the date of manufacture should be confirmed with the supplier. Moisture regain after opening is a primary failure mode on production floors: bulk silos and hopper loaders should be purged with dry air to avoid condensation across cold surfaces. If vacuum conveying is used, the conveying air should be dried to a dew point below −10 °C. Chemical incompatibilities include strong oxidising acids, ketones, esters, aromatic hydrocarbons, and chlorinated solvents, which can cause stress cracking or surface attack in moulded ABS parts.