PPS and GF50 NC PPA each have their advantages under different working conditions. Overall, GF50 NC PPA exhibits better long-term durability in high-temperature and humid environments, while PPS is more advantageous in terms of chemical corrosion resistance and cost control. The following is a detailed comparative analysis:
1. Heat Resistance and Thermal Stability
Indicators: PPS GF50 NC PPA
Long-term operating temperature: Above 200℃ Above 190℃
Heat distortion temperature (HDT): Up to 260℃ (GF30 reinforced) Up to 290℃ (GF50 reinforced)
Dimensional stability: Excellent, low molding shrinkage (0.2%～0.4%) Excellent, small dimensional change after moisture absorption
Conclusion: GF50 NC PPA has a higher HDT and stronger resistance to deformation at instantaneous high temperatures approaching 300℃, making it suitable for extreme thermal cycling conditions.
2. Environmental Adaptability (Key Difference)
Specifications: PPS GF50 NC PPA
Moisture Absorption: <0.1% Approx. 0.8%
Hydrolysis Resistance: Good Extremely strong, can operate continuously under high temperature and high humidity (140℃/80% RH)
Chemical Resistance: Extremely stable to acids, alkalis, and solvents, but not resistant to strong oxidants. Stable to most chemicals, superior to ordinary nylon.
Wuhan Local Tip: In high temperature and high humidity environments during summer, GF50 NC PPA is less prone to performance degradation or cracking due to its strong hydrolysis resistance, making it more suitable for long-term operation.
3. Mechanical Properties and Durability
Indicators: PPS, GF50 NC PPA
Tensile Strength: Approx. 140MPa (GF40), Approx. 160MPa (GF50)
Creep Resistance: Excellent, suitable for load-bearing structures; Better, less deformation under high-temperature loads
Abrasion Resistance: Good; Moderate, slightly lower than PPS
Conclusion: GF50 NC PPA exhibits superior creep resistance under sustained high-temperature loads, resulting in stronger long-term structural stability, making it suitable for high-precision, long-cycle hot runner systems.
4. Cost and Ease of Maintenance
Indicators: PPS, GF50 NC PPA
Price (Domestic): ¥30–48/kg, ¥45–65/kg
Drying Requirements: 120℃ for 2 hours; recommended 140℃ for 4–6 hours; moisture content <0.02%
Local Supply: Jinshixiang and other brands have ample stock; delivery to Wuhan in 3 days. Fast shipping is also supported; inventory is stable.
Economic Recommendation: If budget is limited and the environment is dry, PPS is the best value for money; if long-term stable operation is prioritized, GF50 NC PPA offers superior overall durability.
Final Recommendation
|
Application Conditions |
Recommended Material |
Reasons |
|
High Temperature + High Humidity (e.g., Wuhan summer) |
GF50 NC PPA |
Hydrolysis resistant, low performance degradation, longer lifespan |
|
Highly Corrosive Environments (e.g., frequent cleaning) |
PPS |
Acid and alkali resistant, self-flame retardant, low maintenance cost |
|
High Mechanical Load + Large Temperature Fluctuations |
GF50 NC PPA |
Strong creep resistance, dimensional stability, reduced failures |
Practical Recommendations: For critical components such as temperature control modules and connectors in hot runner systems, prioritize GF50 NC PPA to improve system reliability; for non-load-bearing components such as housings and insulating terminals, PPS can be used to reduce costs.
