PRIST vs. DICE: Which Anti-Icing Fuel Additive Is Best for Your Aircraft?
Key Takeaways
- Fuel system icing inhibitors (FSII) like PRIST and DICE prevent water in jet fuel from freezing in lines and filters – a failure mode that can lead to engine fuel starvation and is particularly critical in cold climates and at altitude.
- PRIST Hi-Flash Hi-Flo and AVL DICE Flash 190 share the same active ingredient (DEGMME) and similar technical profiles, but PRIST's Hi-Flo formulation supports faster dispensing rates (40–55 gpm) versus DICE's 30 to 45 gpm – making PRIST the preferred choice in high-throughput environments.
- Both PRIST and AVL produce TKS deicing fluids for use with weeping wing systems, with identical technical specifications (ethylene glycol-based, AL-5 DTD406B compliant, 72°C flashpoint). The primary practical difference is that PRIST TKS is filtered to 1 micron for tighter quality control.
- DICE Flash 190 holds MIL-DTL-85470B and ASTM D4171 certifications, making it a validated choice for military and commercial applications that require those specifications.
- PJi carries PRIST Hi-Flash Hi-Flo in multiple package sizes – from aerosol cans to 55-gallon drums – along with PRIST TKS deicing fluid and dryer tubes for fuel moisture control. Specialists are available to help match the right product to your operation.
When operating in colder climates or during the winter months, ensuring the safety and performance of your aircraft is crucial. Ice, snow, and frost can compromise critical flight components, reducing aerodynamic efficiency and, more importantly, posing significant safety risks.
Anti-icing and deicing fluids help mitigate these risks by preventing or removing ice buildup on aircraft surfaces. These fluids are particularly vital for maintaining smooth airflow over the wings, tail, and control surfaces, which are essential for effective lift and control during flight.
Additionally, aircraft are vulnerable to fuel-system icing, in which water in the fuel can freeze in the lines or filters, potentially leading to engine failure. Fuel system icing inhibitors (FSII), such as PRIST and DICE, are specifically formulated to prevent ice formation in the aircraft’s fuel system.
In this article, we’ll compare two leading anti-icing fuel additives – PRIST Hi-Flash Hi-Flo and AVL DICE Flash 190 – and take an in-depth look at the TKS deicing fluids from both PRIST and AVL.
How Does PRIST Hi-Flash Hi-Flo Stand Out as an Effective Anti-Icing Fuel Additive?
PRIST Hi-Flash Hi-Flo anti-icing fuel additive is widely recognized for its effectiveness in preventing ice formation in aircraft fuel systems. What sets it apart is its ability to lower the freezing point of water, keeping the water in the fuel liquid and preventing blockages in fuel lines and filters.
This product is easy to handle, less toxic, and less volatile than conventional additives, making it safer for both operators and the environment. PRIST Hi-Flash Hi-Flo is available in multiple packaging options, including 9.5-oz aerosol cans, 5-gallon pails, and 55-gallon drums, each suited to a variety of operational needs.
What Are the Key Benefits of Using AVL DICE Flash 190 Anti-Icing Fuel Additive?
AVL DICE Flash 190 is another highly effective fuel system icing inhibitor, often compared to PRIST. Its primary benefit is its high performance in preventing the freezing of water molecules in jet fuel, which can cause serious issues such as fuel line blockage or engine failure.
DICE Flash 190 meets U.S. military specifications MIL-DTL-85470B and ASTM D4171, ensuring it provides reliable protection for both military and commercial aircraft. It is a non-hazardous, less toxic alternative to older fuel additives, and it comes in a variety of packaging sizes, from 20-oz cans to large drums for bulk use.
How Do PRIST and AVL Anti-Icing Additives Compare on Technical Specifications?
When comparing the technical specifications of PRIST Hi-Flash Hi-Flo and AVL DICE Flash 190, both products share several key features. They are both completely soluble in water and have a density of 1.02 at 20°C. Here’s a breakdown of their specific differences:
- Flashpoint
- PRIST Hi-Flash Hi-Flo: 83.9° to 91°C
- AVL DICE Flash 190: 91°C
- Boiling Point
- PRIST Hi-Flash Hi-Flo: 193° to 194°C
- AVL DICE Flash 190: 194°C
- Flow Rates
- PRIST Hi-Flash Hi-Flo offers Hi-Flo (40-55 gpm) and Lo-Flo (15-30 gpm), while AVL DICE Flash 190 is suitable for 30-45 gpm applications.
- Additional Benefits
- AVL DICE Flash 190 meets U.S. military specifications for anti-icing in fuel systems.
While both additives are chemically similar – featuring diethylene glycol monomethyl ether (DEGMME) as the primary active ingredient – PRIST Hi-Flash is preferred in environments requiring more rapid dispensing due to its Hi-Flo formulation. DICE Flash 190 is trusted for its consistent, high-quality performance in military and general aviation.
How Does PRIST TKS Deicing Fluid Ensure Effective Ice Removal During Flight?
PRIST TKS deicing fluid is designed to provide superior protection against ice accumulation on aircraft surfaces. It is an ethylene glycol-based fluid that depresses the freezing point of water, preventing ice formation and removing existing ice during flight.
One of its standout features is its ability to work with TKS weeping wing systems, providing an effective and efficient way to maintain the aircraft's aerodynamic shape during winter operations. PRIST TKS is ideal for post-takeoff protection, as it not only removes ice but also prevents further accumulation during flight.
How Does AVL TKS Deicing Fluid Compare?
Similar to PRIST TKS, AVL TKS deicing fluid is formulated for use with aircraft TKS systems. It prevents ice accumulation by forming a protective layer on the aircraft's surfaces. This fluid complies with AL-5 DTD406B specifications and is approved by several aircraft manufacturers for use in their TKS systems.
AVL TKS deicing fluid is available in multiple sizes and offers excellent performance in preventing ice buildup, ensuring smooth aircraft operation in cold weather.
What Are the Key Differences Between PRIST TKS and AVL TKS Deicing Fluids?
While both PRIST TKS and AVL TKS offer similar protection, PRIST TKS is specifically designed for better aerodynamics and longer-lasting protection. It is optimized for use with "weeping wing" systems, which provide superior airframe protection compared to other deicing systems.
PRIST TKS fluid is also filtered to 1 micron for superior quality control. In contrast, AVL TKS fluid is also highly effective but may not offer the same long-term protection as PRIST, especially in extreme icing conditions.
What Are the Technical Specifications for PRIST and AVL TKS Deicing Fluids?
The technical specifications for PRIST TKS and AVL TKS deicing fluid are identical. Both products are ethylene glycol-based and comply with AL-5 DTD406B specifications. Each has a flashpoint of 72°C and a density of 1.08. The only difference is that PRIST TKS fluid is clear, while AVL is colorless. Both fluids are available in 1-gallon, 2.5-gallon, and 55-gallon containers.
Which Product Is Superior for Your Anti-Icing and Deicing Needs?
While both PRIST Hi-Flash Hi-Flo and AVL DICE Flash 190 anti-icing fuel additives provide effective protection against fuel system icing, PRIST Hi-Flash stands out as the superior product due to its additional formulations and proven field performance. Similarly, PRIST TKS deicing fluid offers enhanced aerodynamic performance and better overall ice-accumulation prevention than AVL's TKS fluid. For aircraft maintenance, PRIST remains the top choice for both anti-icing and deicing fluids.
The Bottom Line
When it comes to ensuring your aircraft's safety and performance in cold-weather conditions, Pilot John International® (PJi®) is your trusted source for premium anti-icing and deicing fluids. With more than two decades of experience and a commitment to quality, we provide reliable solutions that protect your aircraft even in the most challenging winter conditions.
We offer a range of products to meet your needs, including PRIST Hi-Flash Hi-Flo Anti-Icing Fuel Additive, available in 9.5-oz. and 20-oz. aerosol cans, 5-gallon pails, and 55-gallon drums. Additionally, we carry dryer tubes that are specifically designed to absorb and control moisture buildup in fuel lines and tanks. We provide PRIST TKS Deicing Fluid in 1-gallon and 2.5-gallon containers and 55-gallon drums, ensuring the right amount of product for every situation.
For expert advice and to find the right solutions for your aviation needs, contact our aviation specialists by phone, email, or chat today. We’re here to help you keep your fleet flying smoothly, safely, and efficiently.
