Comparison of Two Molding Processes: Unlocking the Injection Molding Advantages of ABS Material

2025-11-24

Discover the key differences in molding processes with Bost’s expert comparison. Explore injection molding advantages of ABS material to enhance production efficiency and product quality. Learn how choosing the right molding process drives innovation in manufacturing.

In plastic part manufacturing, compression molding and injection molding are two classic processes. The former is known for "pressurization and shaping", while the latter stands out for "batch efficiency". The ABS injection molding process is the precise application of injection molding technology for ABS materials. The three have their own advantages in different scenarios, but can also meet diverse needs through technical adaptation.

First, it is necessary to clarify the core differences between compression molding and injection molding: Compression molding involves placing plastic raw materials pre-pressed into blocks into an open mold cavity, then applying high temperature and pressure through mold closure to melt the raw materials, fill the cavity, and solidify for molding. This process is suitable for producing thick-walled, low-complexity parts (such as plastic handles and simple gaskets), but has a long production cycle and is difficult to achieve mass manufacturing of high-precision parts. Injection molding, on the other hand, heats and melts plastic granules, then injects them into a closed mold cavity at high pressure and speed, and demolds after cooling. It is not only more efficient, but also can produce parts with complex structures (such as holes and patterns), making it the current mainstream batch manufacturing process. BOST is a professional injection mold company, and its technical team selects processes based on part requirements—for example, when a customer needs 100,000 plastic accessories with precision threads, BOST will recommend injection molding instead of compression molding, and ensure the thread precision reaches 0.02 mm through optimized mold design.

ABS plastic cover 2

When injection molding process meets ABS materials, the widely used ABS injection molding process is formed. ABS (acrylonitrile-butadiene-styrene copolymer) combines rigidity, impact toughness and corrosion resistance, making it a common material in home appliances, automobiles, and electronics. However, its processing characteristics have special requirements for injection molding process: ABS is highly hygroscopic and needs to be dried at 80-90°C for 2-4 hours (otherwise bubbles will easily appear after molding); the melting temperature must be controlled at 200-250°C (too low temperature will cause poor material flow, while too high will cause decomposition and discoloration); the injection pressure needs to be 10%-15% higher than that of ordinary PP materials to ensure complex structures are fully filled. BOST is a professional injection mold company and has mature solutions for the ABS injection molding process—for example, when designing an ABS shell mold for a home appliance enterprise, BOST added "vent grooves" to the mold, combined with a precise temperature control system, reducing the shrinkage mark rate of ABS parts from 8% to less than 1%. At the same time, by optimizing the gate position, it avoided the common "weld line" problem of ABS parts.

The advantage of the ABS injection molding process is also reflected in its complementarity with compression molding. For example, for ABS decorative panels in automotive interiors, compression molding cannot produce delicate surface patterns and requires subsequent polishing; while through the ABS injection molding process, BOST can preset patterns in the mold cavity, and obtain parts with decorative effects in one molding, increasing production efficiency by more than 3 times. In addition, for some ABS parts with "thick walls + complex structures" (such as automotive central armrest bases), BOST will integrate the advantages of the two processes—first, use injection molding to make the basic structure, then optimize the density of the thick-walled area through local compression molding, ensuring both precision and avoiding shrinkage holes. BOST is a professional injection mold company, and this "process integration" capability stems from its in-depth understanding of compression molding and injection molding, as well as precise control of ABS material characteristics, which has solved ABS part manufacturing problems for thousands of enterprises.

In practical applications, the success of the ABS injection molding process is inseparable from the collaboration between mold and process. When designing ABS injection molds, BOST reserves dimensional compensation based on the shrinkage rate of ABS (about 0.5%-0.8%), and at the same time matches spiral cooling water circuits to ensure uniform part cooling (avoiding deformation due to uneven cooling); in terms of process parameter setting, BOST adjusts the injection speed through mold testing—for thin-walled ABS parts (such as mobile phone charger shells), the "low-speed filling + high-speed holding" mode is adopted to prevent flash and ensure fullness. These details are the key to why the ABS injection molding process can surpass compression molding and become the mainstream manufacturing method for ABS parts, and also confirm the technical strength of BOST as a professional injection mold company.

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What is the minimum order quantity (MOQ)? Do you support small-batch trial production?

The MOQ for standard products is ≥100kg. We support small-batch trial production (as low as 20kg) and provide mold testing reports and performance data feedback.

Can Bost customize modified plastics with special properties?

Yes! We offer modification services such as reinforcement, flame retardancy, conductivity, wear resistance, and UV resistance, for example:
• Adding carbon fiber to enhance stiffness
• Reducing the coefficient of friction through PTFE modification
• Customizing food-grade or medical-grade certified materials

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Standard products: 5–15 working days; custom modifications: 2–4 weeks. We support global air/sea freight and provide export customs clearance documents (including REACH/UL certifications).

What are the core advantages of Bost engineering plastics compared to ordinary plastics?

Bost engineering plastics feature ultra-high mechanical strength, high-temperature resistance (-50°C to 300°C), chemical corrosion resistance, and wear resistance. Compared to ordinary plastics, their service life is extended by 3 to 8 times, making them suitable for replacing metals in harsh environments.

How do I select the appropriate engineering plastic grade for my product?

Selection should be based on parameters such as load conditions (e.g., pressure/friction), temperature range, medium contact (e.g., oil/acid), and regulatory requirements (e.g., FDA/RoHS). Our engineers can provide free material selection consulting and sample testing.