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Engineering plastics are better than ordinary plastics in thermal stability, mechanical properties and chemical resistance, and are widely used in automotive, electronic and electrical, aerospace and other fields. Ordinary plastics dominate the field of daily necessities and packaging materials because of their low cost. Both have their own advantages and work together to promote industrial development.

Facing rising material costs, manufacturers can significantly cut expenses by switching from traditional painted or two-shot molded automotive B/C pillar trims to high-gloss PC/ASA/PMMA—a paint-free, single-shot solution. This eliminates painting defects, reduces equipment needs, and saves 101 RMB per vehicle (20M RMB/year at scale), while improving heat resistance and design flexibility. Success depends on material-performance alignment, process optimization, and supplier collaboration. Strategic material substitution, not just cheaper alternatives, drives sustainable cost reduction.

The shrinkage rate of plastic reflects the degree of dimensional reduction in a plastic part after it is removed from the mold and cooled. Factors affecting plastic shrinkage include the type of plastic, molding conditions, and mold structure. Different plastics exhibit varying shrinkage rates. Additionally, the shrinkage rate is significantly influenced by the part's shape, complexity of internal structure, and the presence of inserts.

This article systematically decodes nine key performance indicators of engineering plastics, covering basic properties, mechanical strength, surface and electrical characteristics, temperature/weather resistance, chemical stability, and cost economics. By comparing the performance differences and application scenarios of various plastic materials, it reveals the scientific principles and trade-off wisdom in material selection. The text emphasizes that in this era where materials define products, a deep understanding of plastic properties is fundamental for achieving product innovation and enhancing performance and value. It also looks forward to development trends toward high performance, functionality, and environmental sustainability.

CYCOLOY™ CX7240 is a high-performance, non-halogen flame retardant PC/ABS alloy from SABIC. It combines PC’s heat resistance and impact strength with ABS’s excellent flowability, achieving UL 94 V-0 rating down to 0.75 mm thin wall while complying with RoHS and REACH. With a density of 1.19–1.20 g/cm³, MFR of 15–18 g/10min, tensile modulus of 2600 MPa, and water absorption of only 0.20%, it delivers balanced rigidity, toughness, and dimensional stability. Ideal for thin-wall precision parts in electronics & electrical housings, rail transit, medical devices, and smart appliances. Its halogen-free system produces low smoke and low corrosive gases, solving key challenges such as thin-wall flame retardancy failure, halogen compliance risk, and narrow processing windows. CX7240 is a reliable enabler for lightweight, high-safety designs.

SABIC ULTEM™ 2310 is a 30% glass fiber-reinforced polyetherimide (PEI) resin that combines excellent flowability, ultra-high strength (tensile strength up to 169 MPa), and inherent flame retardancy (UL94 V0 & 5VA). It features a heat deflection temperature of 210–220°C, continuous use from -160°C to 180°C, and very low mold shrinkage (0.2%–0.6%). The medical grade (HU2310) offers ISO 10993 or USP Class VI biocompatibility and withstands multiple sterilization methods. Ideal for medical devices, high-temperature connectors, semiconductor tooling, and aerospace/automotive components, ULTEM™ 2310 is the all round ace for demanding injection molding applications.