ASA vs PETG:Comparison Guide(2024) - FOW Mould

ASA vs PETG:Comparison Guide(2024)

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In the rapidly advancing fields of 3D printing technology and sustainable manufacturing, ASA and PETG have become popular choices due to their unique properties.

ASA stands out for its excellent weather resistance and UV protection, while PETG is favored for its outstanding transparency and ease of processing.

This article aims to compare the specific performances and applicability of ASA and PETG, providing a clear and comprehensive guide for designers, engineers, and plastics molding manufacturers in selecting plastic materials.

What Is ASA?

ASA resin, also known as Acrylonitrile Styrene Acrylate, is a terpolymer made from acrylonitrile (AN), styrene (S), and acrylate (A).

By incorporating acrylate rubber, which lacks double bonds, instead of butadiene rubber, ASA retains the excellent mechanical and physical properties characteristic of ABS as an engineering plastic.

Moreover, it significantly surpasses ABS plastic in weather resistance, solvent resistance, and colorability.

ASA plastic
ASA plastic

What Is PETG?

PETG is a transparent, non-crystalline copolyester formed by the transesterification condensation of three monomers: PTA , EG , and CHDM .

Generally, the CHDM content in PETG is about 30%-40%, providing good viscosity, transparency, chemical resistance, and resistance to stress whitening.

When the content of copolyester exceeds 50% CHDM, it is referred to as PCTG.

As the CHDM content increases, the melting point decreases, and the glass transition temperature (Tg) increases.

Polyethylene Terephthalate Glycol

ASA vs PETG:Characteristic

In the “PETG vs ABS” article, we have initially learned that PETG material has the following characteristics:

High Transparency:PETG injection molding products have excellent transparency and glossiness.

Toughness: The ethylene glycol and 1,4-cyclohexanedimethanol components in PETG provide flexibility and elasticity to the polymer chains, allowing them to withstand impacts without cracking.

Chemical Resistance: PETG has good resistance to a variety of chemicals, including certain acids, bases, and cleaning agents.

Environmental Friendliness: PETG copolyester has certain advantages in terms of environmental friendliness.

It contains no toxic substances, does not release harmful gases, and is recyclable.

PETG injection molding
PETG injection molding process

As a material similar to ABS, ASA also possesses a series of unique properties to meet different application conditions:

Strong Weather Resistance: ASA resin has exceptional weatherability due to its rubber phase not containing double bonds, maintaining color and performance even after prolonged exposure to sunlight.

High-Temperature Resistance: It can withstand high temperatures (softens at 105°C) while maintaining dimensional stability.

Anti-static: ASA is an anti-static material that reduces surface dust adsorption, which gives ASA injection molded parts a “lotus leaf effect” that can be refreshed after a rain.

Colorability: ASA resin has excellent color stability and colorability, ensuring strong surface brightness without the need for painting.

Comparison of ASA and PETG

ASA vs PETG:Application Example

In the field of material science, the correct selection of materials is crucial to ensuring that products meet their intended use.

Here is an application case analysis of ASA and PETG, which will demonstrate how these materials function across different industries.

In automotive manufacturing, ASA is used for external parts like mirror casings and grilles due to its excellent UV resistance, replacing some metal components, reducing weight, and cutting costs.

In the construction industry, ASA is coextruded with PVC plastic to improve the weather resistance and color stability of the material.

It is widely used in outdoor building materials such as sinks, drainage pipes, and protective walls, addressing the issue of pure PVC prone to yellowing and poor weather resistance.

asa plastic molding parts
asa plastic molding parts

PETG copolyester, known for its excellent chemical stability and biocompatibility, is commonly used in the manufacture of medical devices such as surgical tools and IV bottles.

Its transparency ensures visibility and long-term durability of medical equipment.

In the packaging sector, especially for food and cosmetics, PETG’s clarity and weather resistance make it a preferred material for containers and boxed products.

Moreover, PETG copolyester also meets sanitary standards, is harmless to food safety, and can protect the quality and freshness of food.

Applications of ASA And PETG

ASA vs PETG:3D Printing

For many 3D printing companies, ASA and PETG are popular material choices, each with distinct printing characteristics:

Firstly, ASA possesses excellent UV resistance, making it highly suitable for printing outdoor 3D models.

Additionally, ASA can provide an exceptional surface smoothness, considered one of the best for aesthetic quality in FDM 3D printing.

However, printing with ASA typically requires a heated bed and an enclosed chamber to prevent warping, necessitating printing equipment capable of maintaining a stable high-temperature environment.

Moreover, most ASA tends to warp and deform during printing and can emit fumes, thus requiring well-ventilated printing spaces.

On the other hand, PETG is a highly transparent material that offers good strength, toughness, and impact resistance, making it popular for manufacturing functional parts and prototypes. PETG exhibits excellent layer adhesion, maintaining a strong bond between layers during printing and reducing the risk of layer separation.

Furthermore, PETG is less demanding on the printing environment compared to ASA and does not require special conditions, making it more accessible and economically advantageous for a wide range of users and hobbyists.

Nonetheless, PETG still requires precise printing settings to prevent stringing and ensure the best print quality.

ASA 3D printing Models
ASA 3D printing Models
PETG Filament
PETG Filament

ASA vs PETG:The Advantages And Disadvantages

ASA is favored for its outstanding weatherability, UV resistance, high gloss, and good mechanical properties, making it particularly suitable for applications requiring long-term outdoor use and an aesthetic appearance.

However, ASA tends to be more costly and may require special handling and equipment during 3D printing and injection molding processes, such as heated beds and enclosed printing chambers.

On the other hand, PETG is valued for its excellent transparency, chemical resistance, ease of processing, and toughness, making it ideal for medical devices, food contact containers, and applications requiring high impact resistance.

Despite these advantages, PETG may perform poorly in high-temperature applications and requires careful handling to avoid issues like excessive stringing during 3D printing and moisture absorption.

When choosing between ASA and PETG, considerations should include application requirements, budget constraints, and processing capabilities.



ASA and PETG are indispensable materials in the manufacturing industry, with their characteristics and advantages playing a significant role in dominating the plastic applications market.

If you wish to obtain more information about ASA and PETG injection molding, feel free to contact us! FOWMOULD will provide you with a free, fast quote.

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