Microns are measurements
Unlock microscopic measurements and their vital role in preserving our heritage. This page delves into what a micron is and its significance in understanding material application, very commonly used for paint application, but not solely. Particularly the difference between wet and dry film thickness.
What exactly is a micron?
A micron, also known as a micrometre, is a unit of length equal to one-millionth of a metre (0.000001 m). In the world of conservation and restoration, understanding such small measurements is crucial. It allows us to precisely quantify the thickness of coatings, layers, and even microscopic particles that can affect the integrity and appearance of historic structures and artefacts.
Wet film thickness: the initial application
When you apply a coating, such as paint or a protective sealant, it's initially measured as wet film thickness. This measurement represents the thickness of the coating immediately after application, before any solvents have evaporated or any curing has occurred. Tools like wet film combs are used to gauge this, ensuring that the correct amount of material is applied to achieve the desired protective or aesthetic properties. Understanding wet film thickness is key to preventing defects and achieving consistent results.
Dry film thickness: the final protective layer
After the solvents in a coating have evaporated and the material has fully cured, its thickness is referred to as dry film thickness. This is the crucial measurement that determines the coating's protective qualities, durability, and overall performance. Dry film thickness is almost always less than wet film thickness due to solvent evaporation. Accurately measuring dry film thickness, often with specialised gauges, is essential for quality control in conservation and ensuring the long-term protection of valuable surfaces. It helps guarantee that the applied material will perform as intended for years to come.
It's all easy.