Eastman’s de-icers are marketed under the brand name Clearway®. Clearway is acknowledged as one of the leaders in airport runway de-icing and the product range has been developed and expanded to include both liquid and solid formate-based and acetate-based products.
Based on a formulation of potassium acetate and corrosion inhibitors, Clearway 1 has been on the market for nearly 30 years as an effective liquid runway de-icer with low environmental impact.
The product meets not only all relevant environmental and ecological requirements but also the AMS 1435 standard. Clearway 1 is classified WGK1* both for its biodegradability and because of its low aquatic toxicity.
When applied with the mechanical facilities of airport maintenance departments, Clearway 1 allows snow and ice to be removed quickly and economically.
Clearway 1 melts the ice by depressing the freezing point of water. Due to its low freezing point, the resultant solution will have a much lower freezing point.
*WGK is a German method of classifying chemicals into three (1-3) Water Hazard Classes. Following several tests the Clearway products have been classified as Class 1: low hazard to waters.
Handling Precautions
Clearway 1 is delivered ready to use. It should not be diluted nor should it be concentrated further.
Clearway 1 is compatible with most known materials used at airports, both related to equipment for storage and equipment for applying the product.
Clearway 1 shows moderate corrosive effect on zinc, galvanized materials, solder and silver. We recommend painting or protecting these items or replace them with items of compatible materials.
The table below lists materials that have been shown to be compatible with Clearway 1.
METALS
Stainless Steel
Carbon Steel
Aluminium alloys (bare & anodized)
Magnesium alloys (wrought, dichromate treated and epoxy coated)
Titanium
Cadmium plated steel
Copper (acid pickled)
Bronze (copper/tin)
POLYMERS
Polyethylene Plastics
Glass fiber reinforced polyester (high pH resistant resin)
Polymethacrylate
Acrylic plastic
Polychloroprene
Silicone
Vulcanized butadiene-acrylonitrite
Vulcanized butadiene-propylene
Painted surfaces
Bitumen
Environmental and toxicology information
All tests are conducted according to international guidelines and specifications, and are performed by test institutes recognized by the industry as one of the leaders in their field of expertize. Clearway 1 is assigned as Class 1 (WGK), which means it is in general not water endangering.
| BOD5 | | 210 mg O2/g |
| COD | | 330 mg O2/g |
| Acute toxicity to Daphnia Magna | EC50 (48 h) | > 2.000 mg/l |
| Acute toxicity to Fish | LC50 (48 h) | > 2.000 mg/l |
| Acute oral toxicity | LD50 (rat) | > 2.000 mg/kg |
Application
Clearway 1 is used as both anti-icing and de-icing chemical. Suggested application rates can be found in the table below. It is however important to take into consideration factors like surface material, surface structure, application-method and current weather situation when using the product. The figure below is therefore only a guide for application and must not be regarded as recommended dosage. We will give advice upon request on application for the respective airport.
In case of thick ice-layers (> 3 mm) it is recommended to use Clearway 1 in combination with the solid product Clearway 6S or Clearway SF3.
In the case of de-icing, the surface should be treated mechanically before applying Clearway 1. This will reduce the amount of liquid used, resulting in minimal environmental impact and lower cost of the de-icing operation.
In the event of freezing rain, a preventive treatment of runways, ramps and taxiways is highly recommended. Applying Clearway 1 before the start of a light snow or ice event prevents frozen precipitation from accumulating. Since Clearway 1 is both an anti-icing agent as well as a deicer, timely application of Clearway 1 is essential to the continued use of operative surfaces.
Careful monitoring of meteorological conditions will keep you ahead of storm events, and guide you in preventive application of the product.
Clearway 1 can be used with all known existing spraying equipment.
SUGGESTED APPLICATION RATES:
| | Dry Conditions Ice thickness <1mm
Light frost | Wet conditions
Ice thickness <1mm
Heavy frost | Wet conditions
Snow
Packed snow | Wet conditions
Freezing rain
Ice Thickness 1-3 mm |
| Temperature (oC) | Anti-Icing | De-Icing | Anti-Icing | De-Icing | Anti-Icing | De-Icing | Anti-Icing | De-Icing |
| 0 to - 5 | 20 g/m2 | 20 g/m2 | 20 g/m2 | 30 g/m2 | 30 g/m2 | 40 g/m2 | 40 g/m2 | 50 g/m2 |
| -5 to - 10 | 25 g/m2 | 30 g/m2 | 30 g/m2 | 40 g/m2 | 40 g/m2 | 50 g/m2 | 50 g/m2 | 60 g/m2 |
| -10 to - 15 | 30 g/m2 | 40 g/m2 | 40 g/m2 | 50 g/m2 | 50 g/m2 | 60 g/m2 | 60 g/m2 | 60 g/m2 |
Packaging
Clearway 1 is available in bulk tankers, and 1000 l IBC’s.
Storage
Clearway 1 meets the requirements of AMS 1435 for storage stability and shows no sign of deterioration when stored for a longer period of time.