Propylene Glycol Coolant NSF −18 °C
Description
Propylene Glycol Coolant −18 °C is a clear, orange liquid. Its propylene glycol-based composition makes it a safe product to handle.
It is a coolant and antifreeze that keeps the circuit in perfect working order for longer periods than conventional inorganic products, and, above all, performs much better than a mixture of USP propylene glycol and water without anti-corrosion additives. Optimized heat transmission, increased installation performance, reduced consumption.
It contains no nitrites or amines, substances which can form nitrosamines, potential carcinogens. Nor does it contain silicates, borates, nitrates, triazoles, 2-EH or heavy metals.
Packaging formats
Advantages
- Protects the circuit against freezing.
- Non-toxic.
- Biodegradable.
- Increases the boiling point.
- Inhibits corrosion.
- Prevents the formation of solids and sludge.
- Not hazardous to water, classified as WGK1 by LAWA.
Technical data
| Property | Value |
|---|---|
| Appearance | Clear orange liquid |
| Propylene glycol content | 35 % w/w |
| Freezing point | −18 °C |
| Protection temperature | −22 °C |
| Burst temperature | −27 °C |
| Boiling point (2 bar) | 124 °C |
| pH (20 °C) | 8 – 9 |
Protection temperature: the freezing point according to ASTM D 1177 is the temperature at which the first ice crystal forms. The DIN 51583 standard specifies the temperature at which the product ceases to flow and there is a risk to the integrity of the circuit. Between these two temperatures, there is a mixture of ice crystals and unfrozen fluid which flows without any increase in volume and therefore without any risk of bursting.
The data provided is based on our own measurements and specialist literature. It does not form part of the technical specifications.
Approvals / Specifications
Propylene Glycol Coolant Concentrate is approved by NSF in accordance with standard HT1 for incidental contact with food (registration no. 152118).
It has the lowest hazard classification for surface water (WGK1) and is included on the positive list of LAWA, the German water protection authority.
Corrosion protection
The results of the test in accordance with ASTM D 1384, which assesses corrosion on various metals, are shown below.
| Material | Propylene Glycol Coolant −18 °C | ASTM D 3306 max. |
|---|---|---|
| Copper | 5.9 | 10 |
| Solder | 0.5 | 30 |
| Brass | 1.3 | 10 |
| Steel | −1.0 | 10 |
| Cast iron | 0.7 | 10 |
| Aluminum | 0.1 | 30 |
The results obtained are expressed in mg per metal sample tested. A negative result indicates a net gain due to the formation of a stable protective layer on the metal’s surface.
Description of the ASTM D 1384 test: in this test method, metal specimens typical of those found in engine cooling systems are fully immersed in aerated solutions of engine coolant mixed with corrosive water for 336 hours at 88 °C. The corrosion-inhibiting properties of the test solution are assessed on the basis of the changes in weight of the specimens. Each test is carried out in triplicate and the average change in weight is determined for each metal.
Compatible materials
Propylene Glycol Coolant −18 °C is compatible with standard materials used in thermal circuits. The table below shows the plastics, sealants and elastomers compatible with the product. The data were compiled from specific literature and proprietary tests.
| Name | Abbreviation |
|---|---|
| Rubber – isobutene-isoprene rubber | IIR |
| Chloropropene rubber | CR |
| Ethylene-propylene-diene terpolymer rubber | EPDM |
| Fluorocarbon elastomers | FPM |
| Natural polypropylene (up to 80 °C) | NR |
| Poly(nitrile-butadiene) rubber | NBR |
| Polyacetal | POM |
| Polyamide (up to 115 °C) | PA |
| Polybutylene | PB |
| High/low-density polyethylene | LD-PE / HDPE |
| Cross-linked polyethylene | VPE |
| Polypropylene | PP |
| Poly(tetrafluoroethylene) | PTFE |
| Rigid poly(vinyl chloride) | PVC h |
| Silicone | Si |
| Styrene-butadiene rubber (up to 100 °C) | SBR |
| Unsaturated polyester (thermoset) | UP |
Phenolic resins, plasticised PVC and polyurethane elastomers are not compatible with Propylene Glycol Coolant −18 °C.
Zinc is not compatible with monoethylene glycol or its mixtures with water; avoid zinc or galvanized tanks.
If there is galvanized material in the system, a whitish sediment will initially appear as the zinc dissolves and precipitates as oxide. Once this solid has been removed, the exposed carbon steel will be protected by Propylene Glycol Coolant −18 °C without requiring any further action on the system.
Thermophysical tables
Thermodynamic properties of Propylene Glycol Coolant −18 °C as a function of temperature.
Propylene Glycol Coolant −18 °C
| Temperature °C |
Density kg/m³ |
Heat capacity kJ/kg·K |
Thermal conductivity W/m·K |
Dynamic viscosity mPa·s |
Kinematic viscosity mm²/s |
Prandtl number | Thermal expansion coefficient β (·10⁻⁵ 1/K) |
Vapor pressure mbar |
|---|---|---|---|---|---|---|---|---|
| −12 | 1,029.4 | 3.38 | 0.385 | 10.5 | 10.2 | 89.8 | 18.67 | 0 |
| −10 | 1,029.0 | 3.39 | 0.388 | 9.4 | 9.1 | 79.9 | 21.27 | 0 |
| −5 | 1,027.7 | 3.41 | 0.396 | 7.2 | 7.0 | 60.7 | 27.26 | 0 |
| 0 | 1,026.2 | 3.43 | 0.404 | 5.6 | 5.4 | 47.0 | 32.60 | 0 |
| 10 | 1,022.4 | 3.47 | 0.418 | 3.6 | 3.5 | 29.8 | 41.56 | 0 |
| 20 | 1,017.8 | 3.51 | 0.432 | 2.5 | 2.4 | 20.1 | 48.65 | 0 |
| 30 | 1,012.6 | 3.55 | 0.444 | 1.8 | 1.8 | 14.4 | 54.25 | 0 |
| 40 | 1,006.9 | 3.58 | 0.456 | 1.4 | 1.3 | 10.7 | 58.65 | 24 |
| 50 | 1,000.9 | 3.62 | 0.467 | 1.1 | 1.1 | 8.3 | 62.07 | 119 |
| 60 | 994.5 | 3.65 | 0.478 | 0.9 | 0.9 | 6.7 | 64.70 | 208 |
| 70 | 988.0 | 3.67 | 0.488 | 0.7 | 0.7 | 5.6 | 66.68 | 311 |
| 80 | 981.4 | 3.70 | 0.497 | 0.6 | 0.6 | 4.7 | 68.14 | 453 |
| 90 | 974.7 | 3.73 | 0.506 | 0.6 | 0.6 | 4.1 | 69.15 | 656 |
| 100 | 968.0 | 3.75 | 0.514 | 0.5 | 0.5 | 3.7 | 69.81 | 943 |
Directions for use
Before filling, the circuit must be flushed with water to remove scale and assembly residues, as well as flux residues, particularly where fluxes containing chloride, fluoride or borax have been used.
Following the pressure test – during which the exact volume of the circuit can also be determined using a meter – the circuit must be filled with a mixture of antifreeze and water or with pure antifreeze, and this must be mixed within the circuit via recirculation. It is not advisable to leave the circuit empty after the pressure test, particularly if carbon steel is present, as it is highly susceptible to damage.
It is recommended that the circuit be properly bled after commissioning to remove any air pockets.
If the circuit is in use, after draining the existing antifreeze, it must be flushed with water to remove sediment and particles before filling the system with Propylene Glycol Coolant −18 °C. Existing corrosion can significantly shorten the product’s service life. If corrosion is detected, corrective measures must be taken before filling the system. Depending on the condition of the previous fluid, it is recommended to clean the circuit before filling it, for example, using Luzar® Clean Cool.
It is recommended to use Teflon or hemp tape to seal threaded joints. Check the compatibility of other products with propylene glycol before using them.
The product is supplied ready for use; do not dilute or mix with other products.
Mixing with other types of antifreeze should be avoided due to the possibility of incompatibilities that could shorten the product’s service life. To enquire about specific compatibilities, please contact our technical department by email: carpemar@carpemar.com.
Avoid prolonged periods of inactivity of the system, as this may affect the product’s stability and significantly reduce its service life.
Minor corrosion damage may become more visible after filling with Propylene Glycol Coolant −18 °C due to this product’s lower surface tension.
Operating temperature
Continuous temperatures above 170 °C cause premature ageing of the propylene glycol.
Temperatures above 200 °C cause the gradual degradation of the antifreeze’s chemical properties, which jeopardizes the reliability of the system’s operation.
The optimum operating temperature range is from the mixture’s freezing point to 130 °C.
In the case of open systems or those where oxygen enters (for example, via valves), the maximum temperature is lower.
Maintenance – Service life
The service life of Propylene Glycol Coolant −18 °C is at least five years in a closed circuit operating between the freezing point and 100 °C. Practical experience shows that the fluid does not degrade under the operating conditions described in this section, resulting in a longer service life.
To check the product’s performance, the most important parameters are the pH and glycol concentration measurements. An annual review of these parameters is recommended.
The glycol content must not differ from the initial value. The appropriate pH range is between 7.5 and 9.0. Outside this range, the product must be analyzed to determine the cause and the procedure to be followed.
Dosage
Precautions
Propylene Glycol Coolant −18 °C is a non-flammable and non-corrosive product. It is non-toxic. In any case, it is recommended to follow good industrial practice when handling chemicals.
Avoid contact with the eyes. In the event of contact, rinse the eye with plenty of water for 10 minutes. Do not ingest and keep out of the reach of children.
When stored in its original, tightly sealed containers at temperatures between 5 and 35 °C, away from direct sunlight, the product retains its properties for at least 24 months.
Downloadable documents
Find all the relevant documentation about the product: technical data sheets and safety data sheets.
