Advanced Engineering Plastics Difference Guide
Comprehensive analysis of PPS, PPSU, PSU, PETP, PA & POM for industrial, medical, and water treatment applications.
The ultimate guide to selecting the right sulfone polymer for extreme durability.
PPS
A semi-crystalline polymer known for extreme rigidity, low creep, and industrial-grade durability.
PPSU
An amorphous polymer offering unrivaled impact resistance and the ability to withstand thousands of steam sterilization cycles.
PSU
Offers transparent heat resistance, serving as the industrial standard for membranes and medical components.
PETP
A high-hardness, low-moisture polymer with excellent sliding properties; the primary choice for high-load precision components.
PA
Highly versatile and wear-resistant, though its performance is sensitive to moisture absorption.
POM
Known for its “plastic steel” properties, high modulus, and superior fatigue strength; the replacement for metal gears and springs.
Basic Definitions & Structural Comparison
| Property | PPS (Polyphenylene Sulfide) | PPSU (Polyphenylsulfone) | PSU (Polysulfone) |
|---|---|---|---|
| Molecular Structure | -[C6H4-S]-n (Benzene ring + Sulfur) | Biphenyl + Sulfone group + Ether bond | Bisphenol A + Sulfone group + Ether bond |
| Crystallinity | Semi-crystalline (40-70% Crystallinity) | Amorphous | Amorphous |
| Appearance | Opaque (Off-white / Brown) | Transparent Amber | Light Yellow / Golden Transparent |
| Fluorine Content | Fluorine-free | Fluorine-free | Fluorine-free |
Performance Characteristics Comparison
| Property | PPS | PPSU | PSU | Ranking (High to Low) |
|---|---|---|---|---|
| Continuous Service Temp | 200-240°C (Short-term 280°C) | 180°C (Long-term) | 150-160°C (Long-term) | PPS > PPSU > PSU |
| Glass Transition Temp (Tg) | N/A (Melting Point 280-290°C) | 220°C | 185-190°C | PPSU > PSU |
| HDT (1.8MPa) | 260-280°C (Higher with filler) | 196-207°C | 174-180°C | PPS >> PPSU > PSU |
| Tensile Strength | 65-90 MPa | 70-80 MPa | 70-80 MPa | Comparable (Higher for filled PPS) |
| Notched Impact Strength | Lower (5-10 kJ/m², Brittle) | Ultra High (60-90 kJ/m² or higher) | Medium (20-40 kJ/m²) | PPSU >> PSU > PPS |
| Rigidity (Flexural Modulus) | Ultra High (3.5-4.5 GPa) | Medium (2.3-2.5 GPa) | Higher (2.6-2.8 GPa) | PPS >> PSU > PPSU |
| Dimensional Stability | Excellent (Low creep) | Excellent | Excellent | PPS > PPSU ≈ PSU |
| Chemical Resistance | Ultimate (Strongest against solvents) | Excellent (Better than PSU) | Good (Resistant to hot water/steam) | PPS > PPSU > PSU |
| Hydrolysis / Steam Sterilization | Fair (Not for long-term hot water) | Top Tier (>1000 cycles at 134°C) | Excellent (Hundreds of cycles at 121-134°C) | PPSU >> PSU > PPS |
| Transparency | Opaque | High (Amber) | High (Light Yellow) | PSU ≈ PPSU > PPS |
| Flame Retardancy | UL94 V-0 (Inherent) | UL94 V-0 (Inherent) | UL94 V-0 (Inherent) | Comparable |
| Processability | Crystalline, high shrinkage | High melt viscosity, narrow window | Easiest to process | PSU > PPSU > PPS |
Application Scenario Comparison
| Material | Core Advantages | Typical Applications | Market Positioning |
|---|---|---|---|
| PPS | High temperature, High rigidity, Chemical resistance, Automotive/Electronic main choice. | Engine periphery (intake manifolds, pump bodies, water pump impellers), Electronic connectors, 5G base station parts, Oil pump gears, Chemical valve linings, Battery trays. | Industrial / Automotive / Electronics workhorse (Largest volume). |
| PPSU | Ultimate impact resistance, Repeated steam sterilization, Biocompatibility. | Medical sterilization trays, Surgical handles, Baby bottles, Dental instruments, Aircraft cabin interiors, Water heater components, High-temp food contact parts. | High-end Medical / Baby Care / Aerospace (Highest unit price). |
| PSU | Cost-effective transparency, Moderate sterilization, Water treatment membranes. | Hemodialysis equipment, Ventilator parts, Water purifier filter housings, Coffee machine heating elements, Medical filter shells, Electrical insulation. | Mid-range Medical / Water Treatment / Food (Best value). |
Quick Material Selection Decision Form
(One-Sentence Summary)
| Your Core Requirements | Preferred Material | Reasoning |
|---|---|---|
| Max Temp + Ultimate Chemical Resistance + High Rigidity | PPS | "King of Corrosion Resistance" for Auto/Electronics |
| Repeated 134°C Steam Sterilization + Ultra High Toughness | PPSU | "King of Sterilization" for Medical/Baby Care |
| 150°C Heat Resistance + High Transparency + Best Value | PSU | "Balance Master" for Water Treatment/Medical |
| Limited Budget but need Transparent Heat Resistance | PSU | Most affordable transparent high-temp plastic |
| Opaque requirement with ultra-high Rigidity/Stability | PPS | First choice for metal replacement in industry |
Basic Definitions & Structural Comparison
| Item | PETP | PA (PA66) | POM (Acetal) |
|---|---|---|---|
| Chemical Name | Polyethylene Terephthalate | Polyamide | Polyoxymethylene |
| Crystallinity | Semi-crystalline | Semi-crystalline | Highly Crystalline |
| Appearance | White / Semi-transparent / Black | Milk white/yellowish (clearer after moisture absorption) | Opaque (Porcelain white or Black) |
| Structural Features | Rigid benzene ring, regular molecular chain | Strong polar amide groups (NH-CO) | No side chains, high density, compact segments |
Performance Characteristics Comparison
| Property | PETP | PA (PA66) | POM | Ranking |
|---|---|---|---|---|
| Continuous Service Temp | 100-115°C | 80-120°C (Long-term) | 90-105°C | PA > PETP > POM |
| Water Absorption | Extremely Low (0.05%) | Extremely High (1.5-3.0%) | Low (0.2%) | PETP < POM << PA |
| Mechanical Strength/Hardness | Extremely High | High (Moisture Dependent) | Extremely High | PETP > POM > PA |
| Impact Toughness | Low (Brittle) | Extremely High (Better when wet) | Excellent | PA >> POM > PETP |
| Dimensional Stability | Top Tier | Poor (Fluctuates with humidity) | Excellent | PETP > POM >> PA |
| Friction & Self-lubrication | Excellent | Good | Top Tier (Wear Resistant) | POM > PETP > PA |
| Chemical Resistance | Resistant to acids/weak bases | Resistant to organic solvents/bases | Resistant to organic solvents/No acid resistance | PA > PETP > POM |
| Creep Resistance | Excellent | Average | Excellent | PETP > POM > PA |
Application Scenario Comparison
| Material | Core Advantage Scenarios | Typical Application Examples | Market Positioning |
|---|---|---|---|
| PETP | Precision, high-load, and dimensionally critical parts | Electronic connectors, precision gears, pump components, insulating gaskets, food packaging, textile fibers | Precision electronics / Instrument parts |
| PA | Structural parts for dynamic loads, wear resistance, and impact resistance | Automotive engine peripheral components, bearings, inline skate wheels, fasteners, housings, cable ties | General automotive / Mechanical structural parts |
| POM | Moving parts and spring components as metal alternatives | Gears, pulleys, zippers, faucet components, seat belt buckles, fuel system parts | Transmission / Motion functional parts |
Quick Material Selection Decision Form
(One-Sentence Summary)
| Your Core Needs | Preferred Material | Brief Reason |
|---|---|---|
| High dimensional precision + Low water absorption | PETP | Changes in ambient humidity will not cause part deformation. |
| Wear resistance + Frequent reciprocating motion | POM | Extremely low friction coefficient with metal-like rigidity. |
| High toughness, impact/drop resistance | PA | Excellent toughness, showing remarkable impact resistance especially after moisture absorption. |
| Replacing copper/aluminum metal gears | POM | Highest fatigue strength; self-lubricating properties reduce maintenance. |
| Strong alkaline environments | PA | Nylon has a natural resistance to alkaline media. |
| Food contact + Transparent/Translucent | PETP | FDA compliant, with better optical transparency than POM and PA. |
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