**——A chemical equipment sealing modification project**
**1. Customer Pain Points**
**Industry**: Chemical reactor stirring shaft seal
**Original solution**: Use nitrile rubber O-ring
**question**:
1. **Not resistant to high temperature**: The temperature of the reactor often reaches above 180℃, and the O-ring hardens and cracks
2. **Corrosion failure**: The medium contains strong acid (such as sulfuric acid, hydrochloric acid), and the rubber swells rapidly and fails
3. **Lockdown due to leakage**: The machine needs to be shut down every 2 weeks to replace the seals, resulting in an annual production capacity loss of about 15%.
**Second, Solution**
**Changed product**: **Pan plug seal (PTFE material + stainless steel spring energy storage)**
**Core Design**:
- **PTFE (tetrafluoroethylene) sealing lip**: corrosion-resistant and high-temperature resistant (-200℃~+260℃)
- **Spring preload**: Dynamically compensates for wear and increases service life by 5 to 10 times
- **Non-standard customization**: Adapt to the eccentricity and vibration conditions of the stirring shaft.
**3. Comparison of the core advantages of pan seal vs O-ring**
Index | O-Ring | Pan seal |
Temperature resistance | Only -40℃~+120℃ (rubber limit) | -200℃~+260℃ (PTFE material) |
Chemical resistance | Susceptible to acid, alkali and oil corrosion | Resistant to 99% strong acid, strong alkali and organic solvents |
Compression deformation | Easy to fail under high pressure | Spring support, suitable for 0~40MPa pressure difference |
Service life | 1~3 months | 12~18 months (actual measurement) |
Maintenance costs | Frequent replacement (labor + downtime costs) | Annual maintenance costs reduced by 70% |
**Core advantages of PTFE materials**
1. **Features of "Plastic King":
- Low friction coefficient (0.04~0.15), reducing shaft wear
- Strong self-lubricating property, no need to add additional lubricant (especially suitable for food/pharmaceutical clean environment).
2. **Chemical inertness**:
- Withstands strong corrosive media such as aqua regia and concentrated sulfuric acid (which cannot be achieved with rubber and metal seals)
3. **Cleanliness Guarantee**:
- No scaling, no precipitates, FDA-compliant, suitable for biopharmaceutical and semiconductor industries.
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### **V. Effect after transformation (customer actual test data)**
- **Leakage rate**: reduced from 30% to <0.1% (helium leak test passed)
- **Maintenance cycle**: extended from 2 weeks to 15 months
- **Total cost**: Annual savings in seal purchases + downtime costs of approximately ¥280,000.
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### **VI. Recommended applicable scenarios**
1. **High temperature/ultra-low temperature**: reactor, high temperature valve, LNG equipment
2. **Strongly corrosive media**: electroplating tanks, pickling equipment, lithium battery electrolyte pipelines
3. **Clean and harsh environment**: biopharmaceutical tanks, semiconductor clean room equipment.
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### **VII. Selection Suggestions**
If your equipment has the following problems, consider pan seal first:
✅ The medium contains corrosive chemicals
✅ Temperature exceeds 120℃ or is below -40℃
✅ Frequent start and stop or eccentric vibration of the shaft
✅ Pursue long-term maintenance-free
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**Conclusion**: Panseal has broken through the temperature and corrosion resistance limits of traditional rubber seals through the innovative design of "PTFE + spring energy storage", and is especially suitable for seal upgrades in harsh working conditions. Foshan Hengyao Seals can provide non-standard customization services based on equipment parameters, and provide free failure sample testing and solution optimization!