NPG+ DETAILS

Higher Fuel Efficiency
Reduced Emissions
Higher Compression & Power
Knock Abatement

EVANS NPG+™ NON-AQUEOUS COOLANT
BETTER HEAT TRANSFER, UNIVERSAL "POUR IN," AND STILL "SAFE!"
FORMULATED WITHOUT WATER - FOR USE WITHOUT WATER

Evans NPG+ waterless coolant, a proprietary blend of glycols (including ethylene glycol) and corrosion inhibitors, is the preferred choice for all installations except where the use of the ingredient ethylene glycol is specifically prohibited. NPG+ is formulated using an ECS patent pending technology which renders the EG portion contained essentially non toxic, the same as our original NPG. In use, NPG+ is as safe for children and animals, No comprimise! Again, as our NPG, NPG+ has improved viscosity and heat transfer characteristics as compared to NPG, eliminating the need in most cases, to make changes to cooling system hardware for installation and use.

Atmospheric boiling point: 375° F (190.6° C)
Freezing point: -40° F (-40° C)

Uses:

All liquid-cooled engines. The same formulation is used for motorcycles, automobile engines, gas-fueled stationary engines, and heavy-duty diesels.

Corrosion inhibitors:

NPG+ is fully-formulated to prevent the corrosion of all cooling system metals. The corrosion inhibitors do not require water for solubility but are fully soluble in the blend of glycols of NPG+. The inhibitors remain in solution and do not “fall out” during storage or use. Supplemental coolant additives (SCAs) are not needed in any applications.

Works like NPG, but improved:

NPG+ provides all of the benefits of its predecessor (NPG) by in addition the thermal conductivity is improved by about 32 percent and the viscosity is reduced by about 65 percent.

Improved characteristics make NPG+ easier to use:

The improved thermal conductivity and reduced viscosity of NPG+ eliminate, in most cases, the need to change cooling system components. In most ordinary automotive and in all heavy-duty systems (except older Cummins low-flow systems) existing components do not have to be changed to use NPG+. In more exotic applications where the cooling system requires optimization (racing and some high-performance applications) component changes to increase coolant flow velocity are recommended.

Operationally, both NPG and NPG+ non-aqueous coolants work the same:

1. There is no failure mode based upon the boiling point of water.
2. The coolant is easily maintained more than 100° F colder than its boiling point.
3. Locally generated vapor immediately condenses into the surrounding liquid.
4. Pockets of vapor do not form to insulate jacket metal from liquid coolant.
5. The coolant pump will not cavitate (unless there is a blockage at the pump inlet) because of the large separation between the coolant temperature and the coolant boiling point.
6. Cylinder liner cavitation in heavy-duty engines is prevented by the large separation between the coolant temperature and the coolant boiling point. (The vibration of cylinder liners doesn’t make vapor during the low pressure part of the cycle and hence there is no vapor to collapse during the high-pressure part of the cycle.)
7. NPG+ is highly non-conductive electrically. Electrolysis, a problem in water-based coolants that damages gaskets and hoses, does not occur.
8. Pressurization, a method to raise the boiling point of water-based coolant is not necessary. With low pressure, system components are under reduced stress.

Use of NPG+ unlocks a cooling system’s “reserve capacity”

Excursions to higher temperatures, that would typically cause the failure of a water-based cooling system, are not a problem. Engine metal temperatures remain under control and the engine is not damaged. In heavy-duty applications, fans can be set to switch on at higher temperatures to reduce parasitic losses. Heat from an EGR cooling load can be accommodated without requiring a larger radiator.

NPG+ is non-toxic

Evans Cooling Systems, Inc. has filed for patents covering its discovery that certain combinations of ethylene glycol and propylene glycol are non-toxic. The report for an EPA acute oral toxicity range test on NPG+ proving its non-toxicity, conducted by an EPA-certified laboratory, is available for purchase from ECS. ECS awaits a ruling by the EPA that will certify that NPG+ is non-toxic.Q: What is NPG+ as compared with NPG?A: NPG+ contains a non-toxic blend of glycols rather than just propylene glycol. It exhibits improved heat transfer and viscosity characteristics as compared with NPG, while retaining all of the non-aqueous operational advantages of NPG. Both products are inhibited against corrosion.

A few NPG+ FAQs

Figure 1.	Viscosity vs Temperature
	Temperature degF (degC)

Figure 2.	Thermal Conductivity vs Temperature
	Temperature degF (degC)

Figure 3.	Specific Heat vs Temperature
	Temperature degF (degC)

Figure 4.	Density vs Temperature
	Temperature degF (degC)

Thank You for taking the time to read through this text. We hope you'll consider a switch to NPG+™ for peak engine efficiency. Please feel free to contact us with questions regarding you specific application or needs, personal or OEM, using the information available to you in our contact page.

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