Water vs. Oil Mold Temperature Controllers: Which Is Right for Your Injection Molding Process?
- 2026.09.11
- TONY WEN / FLYING TIGER KJ CO., LTD.
Quick Summary: How to Decide?
The choice between water and oil depends on your operating temperature range and cleanliness requirements.
- Choose Water MTC: For temperatures up to 180°C. It offers the fastest heat transfer and is mandatory for medical or optical parts.
- Choose Oil MTC: For engineering plastics (like PEEK/PPS) that require extreme heat stability up to 350°C.
Our 180°C High-Temp Water Systems provide the heat of an oil system with the cooling speed and cleanliness of water, eliminating the risk of oil mist contamination.
1. What Is the Difference Between Water and Oil Mold Temperature Controller ?
The choice of medium is primarily dictated by your required operating temperature range MTC and the specific resin you are processing.
- Water Type MTC: Offers superior heat transfer and rapid cooling. Because water has a higher specific heat capacity than oil, it is the most cost-effective medium for standard and mid-high temperature ranges.
- Oil Type MTC: Essential for high-temperature mold controller applications where stability at extreme heat is required. Oil remains stable at atmospheric pressure even at temperatures where water would instantly turn to steam.
2. The Flying Tiger Innovation: 180°C High-Temp Water Systems
Traditionally, if you needed to run a mold at 150°C, you were forced to use oil. Flying Tiger has changed that with specialized pressurized water systems.
The “Zero-Contamination” Advantage
Oil-type controllers can produce oil mist or gas at high temperatures. These vapors can contaminate the mold surface or the final product—a critical failure for medical, optical, or high-end food-grade parts. Our 180°C water systems keep your environment 100% clean.
Superior Productivity & Hardware Durability
- Faster Cycles: Water’s heat transfer coefficient is significantly higher than oil’s, leading to faster cooling and higher throughput.
To withstand high-pressure water, all Flying Tiger internal tanks and piping feature precision-ground and passivated welds. By removing micro-pores in the weld seams, we prevent rust and mineral buildup, ensuring the system remains efficient for years without clogging your mold.
3. When Do You Need a High-Temperature Oil Mold Temperature Controller ?
For engineering plastics that require thermal environments beyond the boiling point of water, Flying Tiger provides a comprehensive range of Oil MTCs:
- 200°C Mid-Temp Oil MTC: A reliable solution for general engineering plastics without the complexity of ultra-high temp setups.
- 250°C High-Temp Oil MTC: The ideal “workhorse” for reinforced resins like PA66 or PBT, ensuring structural strength and surface gloss.
- 350°C Ultra-High Temp Oil MTC: Engineered for extreme materials like PEEK, PPS, or LCP. These units feature magnetic drive pumps to prevent leaks and ensure operator safety at extreme temperatures.
4. Operating Temperature Range MTC: Selection Table
| Material Type | Mold Temp Requirement | Recommended Flying Tiger Model | Cooling Medium |
|---|---|---|---|
| Commodity Plastics (PP/PS) | 40°C - 90°C | Standard Water MTC | Water |
| Optical / Medical (PC/PMMA) | 100°C - 180°C | 180°C High-Temp Water MTC | Water (Clean) |
| Reinforced Resins (PA66/PBT) | 180°C - 250°C | High-Temp Oil MTC | Oil |
| Super Engineering (PEEK/LCP) | 250°C - 350°C | Ultra-High Temp Oil MTC | Oil (Stable) |
5. Why Choose Flying Tiger?
Every Flying Tiger Mold Temperature Controller is an investment in part quality and factory safety:
- Industrial-Grade Durability: Stainless steel internal piping and treated weld seams prevent the “rust-water” issues common in lower-end machines.
- Safety Protections: Includes phase-reversal protection, pump overload protection, and high-pressure release valves as standard.
- ±0.1°C Precision: Stable temperatures prevent part warping and reduce scrap, ensuring every gram of resin is used efficiently.
6. FAQs
Choose the Right Partner for Your Process
Whether you need the absolute cleanliness of a 180°C Water MTC or the extreme power of a 350°C Oil MTC, Flying Tiger has the engineering expertise to optimize your production line.
Explore the Flying Tiger Mold Temp Controller Series
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