🧩 PA+GF20 – Polyamide 20% Glass Fiber

(Reinforced polyamide with 20% glass fiber, designed for superior hardness, heat resistance, and dimensional stability. One of the most common technical variants used in covers, supports, clips, and structural automotive parts.)

🔹 What is PA+GF20

PA+GF20 is a reinforced polyamide (PA6 or PA66) where 20% of the total mass consists of short glass fibers. This reinforcement improves rigidity, mechanical strength, and dimensional stability, while maintaining a good level of resilience and processability. It is widely used in parts subjected to mechanical and thermal stress, where simple plastic would be too flexible or unstable.

🔧 Composition

Polyamide (PA6 / PA66): 80 %
Glass Fibers (GF): 20 %
Additives: UV stabilizers, lubricants, technical dyes.
Density: 1.25–1.35 g/cm³
Melting Point: ≈ 250–260 °C.
Chemical Resistance: Excellent (oils, fuels, antifreeze).
Continuous Heat Resistance: 120–140 °C.

🚗 Where PA+GF20 is used in the automotive industry

Component	Example parts	Observations
Engine / Technical	Covers, consoles, housings	High thermal stability and rigidity
Electrical Systems	Sensor mounts, connectors	Resistance to vibration and deformation
Transmission / Brake	Clips, spacers, supports	Hardness and dimensional stability
Technical Interior	Fastening parts, covers	Matte finish, good mechanical strength

🔧 Welding Temperature and Methods

Method	Optimal Temperature	Observations
Hot Air	260 – 280 °C	Requires light preheating for adhesion
Heat Plate (Mirror)	250 – 270 °C	Clean, rigid joint
Manual Extrusion	250 – 270 °C	Ideal for long cracks and thick areas

🔩 What to Weld PA+GF20 With (Material Compatibility)

Glass fiber reinforcement does not affect basic compatibility — PA+GF20 behaves similarly to pure polyamides.

✅ Compatible with:

PA+GF20 ↔ PA6 / PA66 / PA610 / PA66/6 / PC+PA / PMMA+PA – ideal.
PA+GF20 ↔ PBT / PC+PBT – partially compatible.

❌ Incompatible with:

PP, PE, PVC, PS, ABS, ASA, pure PMMA – different melting points.

💡 ReplastMD Recommendation:

Use PA66 rods or PA66+GF20 rods at 260–270 °C. Maintain a moderate airflow to avoid burning the glass fibers. Avoid excessive melting — fibers can protrude to the surface and affect the appearance.

🏭 Manufacturers and Trade Names

BASF: Ultramid® B3WG4 / A3WG4
DuPont: Zytel® 70G20
DSM: Akulon® PA6-GF20

🧠 How to Identify PA+GF20

Engraved marking: >PA6-GF20<, >PA66-GF20<, >GF20<.
Semi-matte surface, rigid, with a slightly fibrous look.
Blue flame, nylon smell.
Softens at ≈ 250 °C without bubbling.
ReplastMD practical test: If the part is rigid, dense, and thin white fibers appear when cut → confirmed PA+GF20.

🛠️ PA+GF20 Welding at ReplastMD:

At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PA+GF20 welding for engine covers and structural supports, ensuring a solid, heat-resistant, and vibration-proof finish.