🧩 PLA – Polylactic Acid
(Bio-based biodegradable material derived from lactic acid produced by fermenting plant sugars. PLA offers a unique combination of premium appearance, stiffness, and optical clarity, used in eco-friendly auto parts and prototypes.)
🔹 What is PLA
PLA (Polylactic Acid) is a bio-aliphatic polyester. At ReplastMD, we treat it as a high-aesthetic material known for its high stiffness and pronounced gloss. Its main limitation is heat resistance (~60 °C), and it can be brittle under impact. However, it is 100% bio-based and offers a clean, neutral scent during processing. It is the go-to resin for sustainable decorative inserts and rapid prototyping.
🔧 Composition & Properties
- Polymer Base: Pure Polylactic Acid (PLA).
- Source: Corn, sugar cane, or fermented starch.
- Density: 1.23 – 1.26 g/cm³.
- Melting Point: 150 – 170 °C.
- Operating Range: –20 °C to +55 °C.
- UV Resistance: Good.
🚗 Where PLA is used in the automotive industry
| Component | Example parts | Observations |
| Bio Decorative Trim | Covers, plates, inserts | Glossy, ecological, rigid |
| Light Interior Parts | Panels, guards, frames | Compostable, dimensionally precise |
| Bio Films & Layers | Glossy foils, coatings | High clarity and high gloss |
| Prototypes | Test models and molds | Easy to process, economical |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | ⚠️ 110 – 130 °C | Possible, but brittle if cooled too fast |
| Heat Plate (Mirror) | ✅ 120 – 130 °C | Clean, glossy weld |
| Manual Extrusion | ⚠️ 130 – 150 °C | Requires precise pressure control |
| Chemical Bonding | ✅ Recommended | Polyester or bio-epoxy adhesives |
💡 ReplastMD Recommendation: PLA can be welded at 120 °C with hot air, but it is sensitive to thermal stress. For aesthetic parts, bio-based epoxy or two-component bonding is often preferred to maintain the premium finish.
🧠 How to Identify PLA
- Glossy, rigid, smooth surface.
- Color: Milky white, transparent, or translucent colored.
- ReplastMD practical test: Rigid and slightly brittle when bent; softens quickly at 60–70 °C. Emits a sweet, popcorn-like scent when heated.
- Markings: >PLA<, >LUMINY<, >INGEO<, >BIOPLA<.