What is the engineering plastic polyamide?

The Essence and Characteristics of Engineering Plastic Polyamide (Nylon)

1. Core chemical structure
The molecular chain contains repeated amide groups (- CONH -), which are synthesized through condensation reaction to form a high-strength and wear-resistant polymer skeleton.

2. Positioning of engineering plastics
Different from general plastics such as PP and PE, it is designed specifically for mechanical load-bearing components and has stable performance under harsh conditions such as stress, friction, and temperature changes.

3. Material family branch
Aliphatic series: PA6, PA66 (most common, balanced performance)
Semi aromatic series: PA6T, PA9T (high temperature resistance, low moisture absorption)
Special modification: derived grades such as fiberglass reinforcement, wear-resistant filling, conductive composite, etc

4. Core Performance Label
High strength impact resistance: superior to most plastics, can replace metal gears and bearings
Self lubricating and wear-resistant: low friction coefficient, suitable for oil-free lubrication scenarios
Chemical corrosion resistance: resistant to fuel, weak acids and bases, avoiding metal corrosion problems

5. Deadly Shortboard
Moisture absorption: After absorbing water, the size/performance changes dramatically, requiring moisture-proof storage or modification treatment
High temperature softening: For unmodified grades, long-term use temperature ≤ 80 ℃ requires fiberglass reinforcement

6. Typical industrial application scenarios
Transmission components: gears, worm gears, bearing cages
Electrical components: sockets, circuit breaker enclosures (dry environment)
Fluid system: oil pipe joints, valve sealing rings (chemical resistant)

7. Comparison of material competition
Superior to POM: higher toughness and better fatigue resistance
Inferior to PEEK: the difference in temperature resistance and insulation is significant, but the cost is only 1/10