PETG is generally considered to be stronger and more durable than PLA. This is due to its chemical composition and physical properties. PETG, or polyethylene terephthalate glycol-modified, is a thermoplastic polyester that offers enhanced strength and impact resistance compared to PLA. It is known for its excellent toughness, making it less prone to cracking or breaking under stress.
On the other hand, PLA, or polylactic acid, is a biodegradable thermoplastic derived from renewable resources such as cornstarch or sugarcane. While PLA is not as strong as PETG, it still possesses decent strength properties. PLA is often described as having a more brittle nature compared to PETG, which means it may be more prone to breaking or fracturing under significant loads.
In terms of applications, PETG’s strength and durability make it suitable for a wide range of uses. It is commonly used in industries such as automotive, aerospace, and medical where high-performance materials are required. PETG is favored for applications where impact resistance, chemical resistance, and dimensional stability are important factors.
PLA, on the other hand, is widely used in 3D printing applications. Its better melt and cooling properties make it easier to work with in FDM/FFF (fused deposition modeling/fused filament fabrication) printers. PLA is often the filament of choice for hobbyists, educators, and beginners due to its ease of use and availability. It is commonly used for prototyping, decorative objects, and low-stress functional parts.
When it comes to material costs, PLA tends to be more affordable compared to PETG. This is largely due to the difference in production processes and availability. PLA is produced from renewable resources and has a lower manufacturing cost, which contributes to its lower price point. PETG, on the other hand, requires additional modifications to enhance its properties, making it slightly more expensive.
PETG is generally considered to be stronger and more resilient than PLA. While PLA is more commonly used in 3D printing due to its melt and cooling properties, PETG finds its applications in industries where strength, impact resistance, and chemical resistance are crucial. The choice between PETG and PLA ultimately depends on the specific requirements and intended use of the material.