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Model LC-200 / LC-220 / LC-230

Features : Small Footprint Quick Start / Stop Large Capacity Safe Operation Model LC-200 LC-220 LC-230 Maximum Speed/RCF 9,000rpm / 9,600G(TLA-11) Maximum Capacity 480ml (15ml x 32) 1,200ml (15ml x 80) ... more

 QCT Condensation Tester
Home : Our Principals : Q-LAB : QCT Condensation Tester

QCT Condensation Tester

Since 1965, the QCT has been recognized as the standard for condensation testing. Developed by the Cleveland Society for Coatings Technology, the QCT applies controlled warm condensation (or aggressive water) to the test surface. It is especially useful for conducting fast, yet realistic, blister tests. The QCT is easy to use, very low cost and meets ISO, ASTM and BS test methods.

Moisture & Temperature
The QCT uses aggressive water to test the surface resistance of coatings and other material. In a QCT, wetness can be an invisible dew or a continuous, high-temperature running condensate. It can also be programmed for cyclic dry-off to relieve the osmotic pressure. The QCT accelerates moisture attack by increasing the condensation temperature.

Ease of Operation
The QCT does not require special electrical connection or plumbing – just plug it in and connect to a regular mains water supply.

QCT How it Works: Condensation


  1. The water in the bottom of the test chamber is heated to generate hot vapor.
  2. The vapor mixes with air and fills the chamber, creating 100% relative humidity.
  3. Because the test panels are the actual roof of the test chamber, the panels are cooled down by the room air on the outer sides.
  4. The resulting temperature difference causes the vapor to condense on the underside of the panels. This condensate is distilled water, which is saturated with dissolved oxygen. A small amount of water vapor escapes through vapor diffusion channels on each side of the QCT unit. Air continually replaces the escaping water vapor, standardizing the proportions of the air mixture.
Condensation occurs first as microscopic droplets. They coalesce into larger and larger drops until they finally run off. Under constant conditions, this droplet cycle will repeat, providing an excess of condensate to the test surface. Constant condensation develops strong osmotic pressure across a coating, tending to pull pressure into the coating. Drying off the test specimen relieves this pressure. One hour of drying will remove most of the water from a 23-hour condensation cycle. These dry-off periods are representative of many service conditions. Transition back and forth from wet to dry is much more important than the length of dry-off time. When a material is dry, very little deterioration occurs. A drying time of one to two hours is usually enough for cyclic operation.
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