Lors de la sélection de matières plastiques pour l'usinage CNC ou la production de prototypes, understanding how different plastics behave under heat and flame can be helpful, especially during material comparison or early design stages. Below is a general overview of four commonly used plastics: PC, PVC, Abs, and PP.
Polycarbonate (PC)
PC is relatively difficult to ignite compared with many other thermoplastics. Dans la plupart des cas, it will stop burning once the flame source is removed.
When exposed to flame, PC typically produces a yellow flame accompanied by black smoke. After burning, the material tends to soften rather than drip. A mild but noticeable odor may also be present.
In terms of material characteristics, polycarbonate parts are usually pale yellow and can be either transparent or opaque. PC is well known for its high impact resistance and is often used in applications where strength and toughness are important.
Polyvinyl Chloride (PVC)
PVC is considered a flame-resistant plastic and is generally difficult to burn. Once the flame is removed, the material usually self-extinguishes.
During combustion, PVC shows a yellow flame with a greenish color near the base. The material softens under heat and releases a strong chlorine-like odor.
PVC products can be either rigid or flexible, depending on the formulation. The hardness can be adjusted, and finished parts may appear transparent or opaque. PVC is commonly used in piping, insulation, and electrical applications.
Acrylonitrile Butadiène Styrène (Abs)
ABS ignites easily and, unlike PC or PVC, will typically continue burning even after the flame source is removed.
When burning, ABS produces a yellow flame with black smoke and tends to melt and drip. The odor released during combustion is strong and slightly pungent.
ABS parts are usually opaque and have a slightly waxy surface feel. Because of its good machinability and balanced mechanical properties, ABS is widely used for functional prototypes and general-purpose plastic components.
Polypropylène (Pp)
PP is also easy to ignite and burns quickly once exposed to flame. It does not self-extinguish under normal conditions.
The flame is usually yellow with a blue base, and the material burns rapidly and completely. A distinctive odor, often described as similar to diesel, can be noticed during combustion.
Polypropylene parts are typically milky white and may be transparent or opaque. PP offers good surface gloss, faible densité, and strong chemical resistance, making it suitable for lightweight and chemically resistant applications.
General Comparison
Each of these plastics shows different behavior when exposed to flame and heat:
- PC focuses more on impact strength with moderate flame resistance
- PVC provides inherent flame retardancy and flexible material options
- ABS is easy to machine but has higher flammability
- PP is lightweight and chemically resistant, though it burns easily
En pratique, material selection should be based on mechanical requirements, safety considerations, and the intended manufacturing process rather than combustion behavior alone.
About RapidEfficient
Rapidefficient est spécialisé dans l'usinage CNC de haute précision avec 18 années d'expérience.
Ses produits servent des industries notamment médicales, communications, optique, drones, robotique intelligente, automobile, et pièces d'automatisation de bureau.
Les centres d'usinage CNC de l'entreprise sont dotés de quatre axes, à cinq axes, et machines-outils multi-liaison, et sont équipés de projecteurs de précision, machines à mesurer tridimensionnelles (Cmm), spectromètres, et autres équipements d'inspection avancés.
La précision d'usinage peut atteindre 0.01 MM, et la précision des tests peut atteindre 0.001 MM.
