Nanjing Delong ABS PA/ABS AS107 is a polyamide/acrylonitrile-butadiene-styrene alloy supplied for injection molding of interior, enclosure, and housing components in which oil resistance and low-temperature ductility are simultaneous design requirements. Published grade-specific datasheet values for AS107 are limited; the numerical ranges in this description are class-typical data for PA/ABS alloys and must be confirmed against the supplier lot certificate before tool release. The product is designated AS107 on part prints to distinguish it from unmodified ABS, PA 6, and PC/ABS grades.

In the melt state, the alloy relies on multi-phase morphology rather than single-phase miscibility. A polyamide content between 30% and 50% by mass is common in this class; the styrene-acrylonitrile portion contributes melt strength and dimensional control, the butadiene phase contributes impact absorption, and the polyamide phase raises heat resistance and solvent resistance. On production-scale twin-screw compounding lines with L/D ratios of 40:1 to 48:1, undried PA phase raises die pressure fluctuation to ±0.5 MPa or more and changes shot weight by 1.0–2.5% in downstream injection molding. When residual moisture is held below 0.08%, the viscosity curve remains stable and the co-continuous phase network develops more regularly.

How Is AS107 Processed Without Exceeding the PA Thermal Envelope?

Pre-drying is mandatory at relative humidity above 60% RH. A closed-loop desiccant dryer operating at 80°C for 4 h to 6 h with a dew point no higher than -35°C should bring residual moisture below 0.10 wt%. If moisture exceeds 0.15 wt%, the PA phase undergoes hydrolysis during plastication; the resulting loss of molecular weight reduces melt strength, produces silver streaks on the part surface, and creates audible popping at the nozzle. On an injection molding machine with clamp force of 1200 kN, mold temperatures below 65°C delay gate seal and increase orientation-induced warp, while mold temperatures above 80°C extend cycle time and can degrade textured surfaces by differential shrinkage. The recommended melt temperature measured at the nozzle is 245–265°C. Rear barrel zones are set from 240°C to 255°C. Residence time should remain below 8 min; longer residence darkens the SAN phase and increases the yellowness index in light-colored parts.

Use a general-purpose screw with compression ratio 2.0:1 to 2.5:1 and L/D ratio 20:1 to 22:1. Fill speeds of 80–150 mm/s screw advancement suit wall sections from 2 mm to 4 mm. Packing pressure is typically 40–70 MPa hydraulic. For hot runner systems, manifold temperature should not exceed 270°C; thermal degradation products from the PA phase can plate out in the runner channel and become visible as yellow or brown streaks within 20 to 30 shots. Regrind at 20% loading is acceptable when re-dried and blended with virgin pellets, but pellet fines above 3% by mass can cause feed-throat bridging on gravimetric dosing units and inconsistent buffered screw recovery.

Mechanical testing for this alloy class is typically conducted on Type 1A specimens conditioned at 23°C and 50% RH for 24 h before loading. Under ISO 527-2, the class commonly shows tensile yield stress between 42 MPa and 55 MPa, elongation at break from 25% to 60%, and flexural modulus by ISO 178 between 1900 MPa and 2500 MPa. Notched Izod impact by ISO 180/1A at 23°C typically ranges from 25 kJ/m² to 55 kJ/m². At -30°C, the same test often drops to 8–18 kJ/m² depending on polyamide continuity and rubber particle size. Heat distortion temperature by ISO 75-2/B at 0.45 MPa is usually 95–115°C. These are class-typical published ranges, not AS107 lot-specific values, and should not replace design allowables developed from first-production tensile bars.

Moisture conditioning reverses some dry-state properties: tensile yield may fall by 8–15%, while notched impact rises due to PA-phase plasticization. Weld-line strength is especially sensitive to moisture and fill pressure; knit lines in high-tensile regions should be located by mold-filling simulation and validated with short-shot studies. When a low-temperature impact requirement below -20°C is critical, a co-continuous PA-rich morphology is preferred, but this configuration can reduce spiral flow length by approximately 15–20% compared with an ABS-rich variant.

Chemical Resistance, Moisture Uptake, and Part Shrinkage

PA/ABS alloys resist aliphatic hydrocarbons, engine oil, grease, and mild detergent solutions more effectively than general-purpose ABS, because the PA phase is not readily dissolved by nonpolar hydrocarbons. Resistance to aromatic solvents such as toluene and xylene is moderate; the SAN phase may swell and stress-crack under continuous contact. Strong mineral acids, phenol, cresol, concentrated formic acid, and boiling methanol are aggressive. When parts contact windshield washer fluid or brake fluid, stress-crack classification should follow ISO 22088-3 bent-strip tests at 23°C for 48–168 h. Published AS107-specific continuous immersion data is limited; production validation should include 7-day immersion testing at 23°C in the actual service fluid.

Water absorption by ISO 62 after 24 h at 23°C is typically 0.8–1.5% for this alloy class, compared with 0.2–0.4% for ABS and 8–10% for unreinforced PA 6. The absorbed water lowers the PA-phase glass transition temperature, improves room-temperature impact, and increases dimensions. A 72 h exposure at 50% RH commonly produces linear expansion of 0.15–0.30%; snap-fit clearances below 0.25 mm may therefore require humidity-cycling validation. Molding shrinkage by ISO 294-4 typically ranges from 0.7% to 1.2% in the flow direction and 0.9% to 1.4% transverse. The difference between flow and transverse shrinkage is smaller than that of unfilled PA 6 but larger than that of PC/ABS.

Where AS107 Replaces ABS in Enclosure Applications

Compared with general-purpose ABS, the AS107 alloy class provides higher heat distortion temperature, better oil and grease resistance, and lower gloss in textured surfaces. The trade-off is mandatory drying, higher melt viscosity at equal temperature, and a narrower processing window for high-gloss cosmetic surfaces. Compared with unreinforced PA 6, the alloy displays lower water absorption, lower mold shrinkage, improved flatness in parts longer than 150 mm, and reduced warpage after moisture conditioning. Compared with PC/ABS, the PA/ABS class offers better resistance to aliphatic hydrocarbons but generally lower room-temperature notched impact, higher moisture uptake, and greater sensitivity to acidic chemical agents.

The comparative ranges below are class-typical values and are not AS107 lot certificate data. They are provided to support material substitution studies when existing tooling cannot accommodate a full mold-flow revalidation.

Material substitution from ABS into AS107-class PA/ABS may require increasing pack pressure by 10–20% and adjusting the hold profile to compensate for higher shrink anisotropy. In existing ABS tooling, thin ribs below 1.5 mm may fill with greater difficulty due to the higher viscosity of the alloy; mold-filling simulation should be rerun using the actual viscosity curve rather than a single melt-flow index value.

Typical applications for AS107-class alloys include automotive interior lower trim, power tool housings, electrical enclosure frames, and furniture fittings where oil contact and occasional low-temperature impact are expected. In automotive interior validation, parts are conditioned for 72 h at 23°C and 50% RH before assembly; snap-fit retention force may decrease by 10–15% after moisture plasticization. For power tool housings, vibration welding parameters in production trials have used weld amplitudes of 0.8–1.2 mm and collapse distances of 1.5–2.0 mm. When ultrasonic welding is selected, the PA phase may generate fine particle debris at the joint, and post-weld tensile pull strength should be checked under ISO 527-2 using a sub-size specimen if the housing wall is below 3 mm. For electrical enclosure applications, lot-level RoHS compliance should be verified against EU 2011/65/EU Annex II and REACH Article 33. No AS107-specific datasheet values were available for these joining processes; pre-production trials on production-scale molding and joining equipment are required to set process windows.