2 shot plastic injection molding enables the use of dissimilar resins to be used in a multi-part assembly. In some instances, a 2 shot mold application may include different colors and also soft and hard materials assembled together in in a single part.  Some of the benefits of 2 shot plastic injection molding include elimination of post-molding assembly, fewer injection molding machines to make a single part and reduced part handling by operators by utilizing a single molding operation.

As the application scope of ASA and ABS continues to expand, concerns about safety hazards in plastic products have arisen: Is ASA toxic? Is ABS safe?

Due to its unique structure, ASA offers similar chemical resistance to ABS but with better weatherability and UV resistance, which can translate into better long-term performance and safety in outdoor applications.

This comparison highlights the key differences between ASA and ABS; for more insights into plastic materials, stay tuned to FOWMOULD!

ASA shares these strengths but stands out for its enhanced toughness and better integrity under UV exposure, especially in outdoor settings.

Compared to ABS, ASA significantly improves weather resistance by substituting butadiene rubber with acrylate rubber, which lacks double bonds.

Midwest Mold offers a cost-effective solution to challenges caused by parts that require the use of two different plastics. 2 Shot injection molding is a process that molds one part using two different plastic resins. This enabling technology allows you to use two colors of plastics or to integrate both hard and soft plastics into one part without any post-molding assembly.

Yet, printing with ASA typically demands higher extrusion temperatures, and it is pricier compared to ABS, necessitating a balance between cost and application needs when selecting plastic materials.

Its electrical insulation properties also make it attractive for those looking to manufacture casings for electrical components, as well as automotive parts like dashboards or bumpers.

In additive manufacturing, its other common uses include prototyping, gears, and even tools, as it offers better resistance to physical stress than some other common 3D printing polymers.

Outstanding UV resistance and anti-aging capabilities mark a significant advantage of ASA and represent one of its largest differences from ABS plastic.

The substitution of rubber double bonds plays a pivotal role in defining the subtle yet significant differences in performance between ASA and ABS.

ABS and ASA both exhibit good thermal stability during processing, but ASA’s enhanced resistance to UV light can translate to better long-term thermal stability in outdoor applications.

ASA contains modifiers in its composition that enhance its resistance to UV-induced fading and yellowing, making it more suitable for applications where long-term aesthetic appeal is important.

Therefore, it is recommended to use ABS in well-ventilated areas and follow safety guidelines to minimize exposure to these emissions.

ASA is renowned for its outstanding weatherability and UV resistance, making it highly suitable for outdoor use where it can maintain its color and physical properties over extended exposure to natural elements.

Midwest Mold specializes in the design and build of 2 shot plastic injection molds and has successfully manufactured pre-production and production tooling for structural, water management, crash impact and noise reduction applications.

ASA can withstand degradation, aging, and fading caused by UV exposure, while also offering robust protection against decomposition or discoloration due to oxidation in the atmosphere and high temperatures during processing.

2 shot injection molding reduces the number of machines and molds required to mold two materials together into one part, and it minimizes part handling, all of which can add up to lower costs. In addition to financial benefits, 2 shot molding can provide:

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Despite its lower UV and weather resistance compared to ASA, ABS remains a popular choice for indoor applications where these factors are less critical, and its use continues to be supported by ongoing research and improvements in plastic formulation and processing techniques to enhance its safety profile.

ABS, known for its high impact strength and mechanical robustness, is the material of choice for consumer goods, automotive parts, and electronic housings.

ABS plastic is a terpolymer made from acrylonitrile (A), butadiene (B), and styrene (S), combining the properties of PB, PAN, and PS to create a material with a balanced set of mechanical characteristics that are tough, hard, and rigid.

ACIS®, Autodesk Inventor®, CATIA® V5,Creo™ Parametric, IGES, Parasolid®, Pro/ENGINEER®,Siemens PLM Software’s NX™, SolidEdge®, SolidWorks®, STEP

In the numerous plastic applications where mechanical strength and stiffness are essential, ASA and ABS are often the materials of choice.

Overall, both ASA and ABS are versatile thermoplastic polymers that, despite their similarities, possess unique characteristics to meet different application needs.

As we’ve mentioned, one of the main attractions of ABS is its technical nature, which tends to steer its applications towards industrial uses.

In terms of health and environmental safety, ABS does not contain any known carcinogens and is generally considered non-toxic when it is in its solid form.

In the following content, we will delve into the performance of these two materials and comprehensively evaluate their performance in specific application scenarios.

While both materials have the drawback of emitting fumes during processing, especially in 3D printing, this issue can be mitigated with appropriate safety measures.

ABS has been noted to emit styrene during printing, a VOC with potential health risks in poorly ventilated spaces, while ASA is often regarded as having a less intense odor but still requires proper safety measures.

Additionally, for general purposes, it can be found in home appliances, hulls, decorative items, toys, and the renowned LEGO bricks.

With 2 shot molding, parts can include a clear window, integrated gaskets, movable segments, water shields, or sound or vibration reduction.

On the other hand, ASA boasts strong UV and impact resistance, making it suitable for various outdoor installations such as signage, sports equipment, and automotive exterior applications.

ASA’s fire resistance is about ten times higher than that of ABS, with a fire rating of B1 level, meeting the basic fire protection requirements for residential housing, which ABS does not achieve.

Additionally, ABS’s composition allows it to be recycled, reducing its environmental impact compared to materials that cannot be easily processed for reuse.

Technically, ASA not only retains the main properties of ABS but also incorporates the weather resistance advantages of PMMA plastic, extending its application to outdoor uses.

The acetone smoothing method, known for achieving a high-gloss surface effect on ABS, is equally applicable to ASA materials. ASA injection molding products do not require painting, plating, or other surface protection and can be used outdoors directly.

ABS is celebrated for its robust mechanical strength and stiffness, making it suitable for durable products, alongside notable impact resistance, even in cold environments.

However, the major drawback of ABS is the intense fumes produced during printing, accompanied by issues like warping, hence it’s recommended to print in well-ventilated areas.

In terms of heat resistance, ASA and ABS are relatively similar, with ABS having a heat distortion temperature of 93~118°C and still displaying some toughness at -40°C.

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