Dongguan Zhongjie Plastic Granules ABS 135A1 is an acrylonitrile-butadiene-styrene copolymer pellet product supplied in granulate form for injection molding and extrusion. The commercial suffix 135A1 is a producer identifier and is not a standardized designation under ISO 2580-1:2002; therefore, the exact base resin, rubber content, melt flow rate, and thermal stability must be confirmed against the supplier lot certificate of analysis. Published data for this specific configuration is limited, and the numerical ranges in this document are general-purpose ABS reference values taken from publicly available polymer literature unless otherwise indicated. The material is positioned as a general-purpose ABS resin without an automatic flame-retardant, UV-stabilized, or food-contact classification.

The Commercial Suffix 135A1 Is a Supplier Code, Not an ISO Data Block

Under ISO 2580-1:2002, ABS molding and extrusion materials are designated by a data block covering type, grade, and properties such as melt volume-flow rate, impact strength, and heat deflection temperature. The suffix 135A1 does not carry a standardized ISO data-block meaning; it is a supplier trade code. Consequently, two ABS grades with similar suffixes may differ in acrylonitrile content, butadiene rubber particle size, grafting ratio, and molecular mass distribution. For ABS 135A1, the material should be compared with general-purpose ABS grades using ISO 1133-1:2022 for melt volume-flow rate and ISO 179-1/1eA or ISO 180/A for notched impact. Without lot-specific data, the grade cannot be assumed to match high-impact ABS or high-heat ABS. High-impact ABS typically contains a coarser or bimodal rubber particle-size distribution and higher rubber mass fraction, producing notched Charpy values above 30 kJ/m² but lower rigidity and hardness. High-heat ABS uses increased acrylonitrile or a substituted monomer to raise the heat deflection temperature under ISO 75-2:2013 method B to 95 °C to 110 °C, with reduced melt flow and greater processing difficulty. The differentiation required for ABS 135A1 therefore rests on its specific melt-volume-flow rate, impact test result, and heat deflection temperature provided in the production lot COA.

How Should ABS 135A1 Be Dried and Stabilized Before Melt Processing?

ABS resins are hygroscopic, and moisture uptake during storage or hopper residency leads to surface splay, reduced weld-line strength, and polymer degradation. For ABS 135A1, a desiccant-type dryer with a dew point at or below −20 °C is required. The granules should be dried at 80 °C for 2 h to 4 h; residual moisture must be below 0.1 % by weight after drying, determined by ISO 15512:2019. In production areas where relative humidity exceeds 60 % RH, the dried material should be transferred within 20 min to 30 min or through a closed feed throat with dry-air purge. Batch-to-batch variation in moisture content is not unusual; incoming lots should be sampled at the bottom of a supersack or octabin because moisture distribution is often non-uniform. Failure modes observed on 80 t to 120 t hydraulic injection machines include intermittent splay on the first shot after a dwell cycle, lower weld-line burst pressure, and increased shot-to-shot viscosity shift. These conditions are not corrected by raising melt temperature alone and require improved drying.

Melt Temperature, Injection Speed, and Barrel Residence Limits

General-purpose ABS is typically processed within a melt-temperature range of 210 °C to 250 °C. For ABS 135A1, the supplier-specific window should be confirmed from the lot COA, but the following are standard starting parameters for ABS on a 3-zone general-purpose screw with an L/D ratio of 20:1 to 25:1. Rear, middle, and front barrel zones are commonly set from 180 °C to 210 °C, 200 °C to 230 °C, and 210 °C to 240 °C, with nozzle temperature between 210 °C and 240 °C. Screw rotation is usually 40 rpm to 80 rpm, back pressure 0.5 MPa to 1.0 MPa, and decompression 3 mm to 5 mm. Residence time at melt temperature should not exceed 5 min. Thermal degradation of the butadiene phase accelerates above 260 °C; this produces yellowing, free-formaldehyde odor, and a measurable loss of impact strength without a corresponding change in melt pressure. In hot-runner molds, the hot-runner manifold temperature should be kept within the same upper limit because stagnation in dead spots can create black specks. Use of nitrided screws is sufficient for neat ABS; bimetallic barrels and screw tips are recommended only when regrind contains abrasive contaminants.

Injection pressure required for ABS 135A1 is tool-dependent. On a 100 t machine producing a 2 mm wall-thickness housing with a flow-length-to-thickness ratio near 150:1, injection pressures from 70 MPa to 120 MPa and injection speeds from 100 mm/s to 300 mm/s are typical for general-purpose ABS. The gate freeze-off time should be established by a short-shot study, and hold pressure should be increased until the part mass stabilizes. Mold temperature between 40 °C and 80 °C is used for ABS; lower temperatures reduce cycle time but increase orientation stress and may lower impact strength. For ABS 135A1, production trials should map the pressure-limited processing window because the published injection-molding data for this specific lot is limited.

When ABS 135A1 Replaces a Higher-Impact ABS in Appliance Housings

Replacement of a higher-impact ABS with ABS 135A1 should be based on a part-level test program rather than a direct data-sheet comparison. General-purpose ABS reference notched Charpy values under ISO 179-1/1eA fall between 10 kJ/m² and 25 kJ/m², whereas high-impact ABS often exceeds 30 kJ/m². If the original housing specification requires a minimum notched impact above 25 kJ/m², ABS 135A1 may be unsuitable unless the producer confirms a higher value for the specific lot. Thin-wall appliance housings with wall thickness from 1.2 mm to 2.5 mm also depend on melt flow. General-purpose ABS grades with melt volume-flow rates below 10 cm³/10 min at 220 °C and 10 kg under ISO 1133-1:2022 may produce short shots or require excessive injection pressure in multi-cavity tools. Weld lines formed downstream of holes or bosses are particularly sensitive to moisture and melt temperature; weld-line tensile strength should be tested according to ISO 527-2:2012 or ISO 527-1:2019 for the final part or a representative specimen cut from the molded component. The use of ABS 135A1 in an appliance enclosure requires a flammability evaluation if the part is subject to IEC 60695-11-10 glow-wire or UL 94 requirements. General-purpose ABS without flame retardants typically carries an HB classification; any V-0 claim must be demonstrated with a specific thickness and color concentrate.

Rheological and Morphological Factors Controlling Weld-Line Strength

The weld line in an injection-molded ABS 135A1 part is formed when two melt fronts meet but do not fully re-entangle. The resulting weld-line strength depends on melt temperature, hold pressure, and the rubber-phase stability at the flow front. For ABS, weld-line impact values can be 30 % to 60 % lower than the bulk material because rubber particles are oriented parallel to the weld line and because additives or volatiles accumulate at the front. Capillary rheometry under ISO 11443:2021 can be used to compare the shear viscosity of ABS 135A1 with the displaced grade. At shear rates typical of injection filling, 500 s⁻¹ to 5000 s⁻¹, general-purpose ABS exhibits shear-thinning with a power-law index below 1. If ABS 135A1 has a higher melt-volume-flow rate, it may produce a more uniform pressure profile but a lower weld-line tensile value because the molecular chain orientation is less relaxed. The use of a hot mold, 60 °C to 80 °C, extends the time available for interdiffusion across the weld line. Tensile specimens cut across the weld line should be tested according to ISO 527-2:2012; a weld-line strength retention above 70 % of the bulk tensile yield stress is often used as an acceptance criterion for non-safety housing components. For safety or load-bearing parts, a higher retention level or a direct impact test using ISO 179-1/1eA should be specified.

Compliance Documentation for EU, Food-Contact, and Halogen-Free Applications

ABS 135A1 supplied to the European Union must be accompanied by regulatory documentation under REACH Regulation (EC) No 1907/2006 and, for electrical and electronic equipment, Directive 2011/65/EU Annex II. A supplier statement is not a substitute for finished-article due diligence; the molder must evaluate color concentrates, regrind, mold-release agents, and assembly components. For food-contact applications, compliance is not automatically conferred by a generic ABS data sheet. The material must undergo migration testing according to EU Regulation (EU) No 10/2011 or FDA 21 CFR 180.22 depending on the target market, and the test conditions must reflect the intended food type, temperature, and contact duration. Halogen-free commitments require verification against IEC 61249-2-21 or equivalent; ABS is not inherently halogen-free because certain additive packages may contain brominated flame retardants. The following compliance matrix identifies the minimum verification documents that should be obtained before release.

ABS 135A1 should not be blended with polycarbonate or polyvinyl chloride without a dedicated stabilization and compatibilization study. Polycarbonate blends can exhibit transesterification and molecular weight reduction if moisture or metal contaminants are present; PVC blends liberate hydrogen chloride above 180 °C, which corrodes tool steel and degrades the butadiene phase. If regrind is used, the regrind ratio should be kept constant, and the regrind must be dried to the same residual moisture level as virgin granules. Repeated regrind cycles lower melt viscosity and darken the material; for critical impact applications, regrind content above 25 % should be validated by impact and color testing on the actual production line. Incoming inspection of ABS 135A1 should include melt volume-flow rate according to ISO 1133-1:2022, moisture content according to ISO 15512:2019, and a visual check for black specks and pellet-size anomalies. Published data for this specific configuration is limited; therefore, all release decisions should be based on supplier documentation and first-article testing rather than generic property tables.