Price excl. VAT
Price excl. VAT
Price excl. VAT
Climatic, Dew Point & Relative Humidity
Controlling climatic conditions such as temperature, relative humidity, dew point and humidity is a fundamental requirement for successful coating application in many industries. These parameters not only determine the conditions during application, but also the resulting quality and performance of the coated product.
Climate conditions and their importance
Elcometer offers a comprehensive range of instruments for measuring dew point, relative humidity, as well as thermometers, data loggers, moisture meters and anemometers for monitoring climatic conditions. These devices are essential to ensure that the climatic conditions meet the requirements for achieving an optimal coating result.
A common problem when applying protective coatings is the condensation of moisture on surfaces when the temperature is too low. This condensation occurs when the surface temperature (Ts) falls below the dew point temperature (Td). The dew point is the temperature at which water vapour from the air condenses as liquid water.
Why monitoring the temperature difference is crucial
By monitoring the surface temperature relative to the air temperature and relative humidity, the dew point temperature can be calculated and compared to the surface temperature. This temperature difference (TΔ) is crucial to determining whether it is safe to apply the coating. If the temperature difference is too low, there is a risk that moisture will condense on the surface, which can affect the adhesion and durability of the coating.
Other important factors for coating
The temperature of the coating material itself also plays a crucial role, as it affects the viscosity, durability and application properties of the coating. During the curing process, continuous monitoring of climatic conditions is required. If the temperature is too high, the coating may dry too quickly, resulting in surface defects. If the temperature is too low, the curing time is extended, which can lead to delays and possible defects in the next coating layer, such as amine blush.
Special requirements for powder coating
Curing in powder coating requires that a specific temperature be reached for a specific length of time. Monitoring the oven profile ensures that the product is brought up to the appropriate temperature and held for the required time. If the oven or product is too hot, the coating can burn; if it is too cold, the coating will not cure, resulting in poor adhesion and an uneven appearance.
Moisture and its effects
The presence of moisture in the material will result in poor adhesion, premature coating failure and an unsightly finish. For example, applying a powder coating to a damp wooden panel can cause steam to form as it passes through the curing oven, damaging the coating.
With Elcometer's range of accurate climate gauges, you can ensure that all climate conditions are closely monitored, guaranteeing the best possible coating quality.
