Derived from renewable resources, PLA offers a biodegradable alternative to petroleum-based polyester (PET). This evaluation compares verified technical data, highlighting how PLA matches standard performance while offering distinct advantages in comfort and sustainability.
Superior Wicking
PLA transports moisture away from the body more effectively than PET, offering a drier, more comfortable sensation.
93% Elastic Recovery
Compared to polyester's 65% (at 5% strain), PLA demonstrates better shape retention and wrinkle resistance.
Lighter Density
At 1.24 g/cm³, PLA creates fabrics that are physically lighter than polyester (1.38 g/cm³) equivalents.
Typical Performance Parameters
Textile-Grade Fibers Comparison
| Property | PLA Fiber | Polyester (PET) | Analysis |
|---|---|---|---|
| Density (g/cm³) | 1.24–1.27 | 1.38 | PLA results in lighter fabrics |
| Melting Point (°C) | 170–178 | 250–260 | PLA softens at lower temps |
| Tensile Strength (cN/dtex) | 3.2–5.0 | 4.5–5.5 | Aligns closely for standard use |
| Elastic Recovery (at 5%) | 93% | 65% | PLA has superior shape retention |
| Moisture Regain (%) | 0.4–0.6 | 0.4 | Essentially equivalent |
| Wicking Performance | High | Standard | PLA offers drier comfort |
| UV Resistance | Strong | Adequate | PLA maintains integrity longer |
| Thermal Insulation | Excellent | Standard | Up to 20% better in PLA |
Detailed Analysis
Mechanical Strength
PLA's tensile strength (3.2–5.0 cN/dtex) closely matches polyester for everyday applications. The standout feature is elastic recovery (93% at 5% strain vs 65% for PET), contributing to significantly better wrinkle resistance and shape retention in garments.
Physical Feel
PLA fibers are lighter and softer than polyester, often described as having a silk-like luster. While moisture regain is similar, PLA's structure provides superior wicking, transporting perspiration away from skin more effectively.
Core Textile Advantages
- Natural, soft hand feel
- Low density (Lightweight)
- Quick-drying capability
- Excellent drape
Thermal Limitations
Standard PLA has a melting point of 170–178°C and softens above 60°C (Tg). This is significantly lower than polyester (250°C+), restricting high-heat applications.
Stereocomplex PLA, nucleating agents, and blending with cotton/wool are used to improve heat resistance.
Functional Benefits
-
Stronger UV Resistance Preserves fabric strength longer under sun exposure.
-
Flame Retardancy Higher limiting oxygen index and lower smoke generation.
