When selecting materials for fittings in chemical transfer, consider the chemical compatibility, temperature, pressure, and mechanical properties. Here are some common materials and their suitability:
1. **Stainless Steel (316/316L):**
- Best for: Acids, alkalis, and solvents.
- Advantages: High corrosion resistance, good mechanical strength, and temperature tolerance.
- Limitations: Not suitable for hydrochloric acid or chlorine.
2. **Polypropylene (PP):**
- Best for: Acids, alkalis, and aqueous solutions.
- Advantages: Lightweight, cost-effective, and good chemical resistance.
- Limitations: Limited temperature range and not suitable for strong oxidizers.
3. **Polyvinylidene Fluoride (PVDF):**
- Best for: Acids, halogens, and alcohols.
- Advantages: High chemical resistance and good mechanical properties.
- Limitations: More expensive than other plastics.
4. **Polytetrafluoroethylene (PTFE):**
- Best for: Almost all chemicals, including strong acids and bases.
- Advantages: Excellent chemical resistance and wide temperature range.
- Limitations: Low mechanical strength and high cost.
5. **Polyethylene (PE):**
- Best for: Acids, alkalis, and some solvents.
- Advantages: Good chemical resistance and cost-effective.
- Limitations: Limited temperature range and not suitable for strong oxidizers.
6. **Hastelloy:**
- Best for: Highly corrosive environments, including strong acids and chlorine.
- Advantages: Exceptional corrosion resistance and high strength.
- Limitations: High cost.
7. **Brass:**
- Best for: Water, air, and non-corrosive fluids.
- Advantages: Good mechanical properties and cost-effective.
- Limitations: Poor resistance to acids and ammonia.
8. **PVC (Polyvinyl Chloride):**
- Best for: Water, acids, and alkalis.
- Advantages: Cost-effective and easy to install.
- Limitations: Limited temperature range and not suitable for organic solvents.
Always consult chemical compatibility charts and consider the specific conditions of your application when selecting materials.