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HomepageFaq › Glossary of Paint Terms: Binder to Brittleness of Paint

Glossary of Paint Terms: Binder to Brittleness of Paint


Binder
The binder is the non-volatile portion of the vehicle of the coating which holds the pigment particles.

Bituminous Coating
A bituminous coating is a coal tar or asphalt based coating material usually used in thick films.

Blast Cleaning 
Blast cleaning involves cleaning and roughening a surface by the use of sand, artificial grit or fine metal shot which is projected at the surface by compressed air or mechanical means. There are many different blasting standards that are referred to internationally. SSPC is one such standard that is frequently used. SSPC (Steel Structures Painting Council) give the requirements for different grades of blast cleaning. 

Blast Profile
Blast profile refers to the surface profile that is created on a piece of steel by abrasive blasting or other power tool cleaning. The distance between peaks and valleys on the steel surface gives an indication of the blast quality. Another term used to describe this is Anchor Pattern. 

Bleaching
Bleaching is the fading of a colour towards white. With coating systems this is generally caused by exposure to chemicals ro ultraviolet radiation. This is a common result with epoxies that are left externally exposed and aren't topcoated with a UV stable coating (typically epoxies are overcoated with a polyurethane coating, which has good UV resistance). 

Bleeding 
Bleeding refers to the diffusion of colour matter through a coating from underlying surfaces causing colour change. In basic terms you can see the underlying coatings or substrate coming through the topcoat. This is also referred to a "grinning through". This can happen with coatings that have poor opacity (poor covering power) or when the topcoat is stretched out to far (under applied).

Blistering 
Blistering refers to the formation of blisters in paint films by the local loss of adhesion and lifting of the film from the underlying substrate.Blisters are described as "dome shaped projections in the paint film". The most likely cause of blisters forming in your paint film is that the paint film has become swollen due to presure beneath the coating. This pressure can be down to foreign contamination such as oil, grease, trapped moisture, hydrogen vapour, etc..

Blooming
Blooming is a haziness which develops on the topcoat of a painted surface as it dries. It is caused by the exudation of a component of the paint film and the result is a hazy looking finish on your paint system. 

Blushing
Blushing is a defect in the paint film which manifests itself as a milky appearance which is generally caused by rapid solvent evaporation or the presence of excessive moisture during the curing process. This issue is most often caused by humidity issues in the wrokshop where the painting is being carried out. In humid conditions excess moisture in the air will cause water droplets to condense on the paint surface as it dries, resulting in a milky looking haze over the topcoat. Cellulose based paints and other fast evaporating solvents (e.g. acetone, toluene) are most prone to blushing. Tip: Ensure that the temperature of your spray booth in always a few degrees above the dew point. Blooming and Blushing tend to start to be a problem at temperatures of 10C and below.

Bonding
Bonding is the attachment of a coating film to the underlying material to which it is being applied. This is perhaps one of the most critical elements of any paint system. If the bond between the paint and the surface that it is applied onto is weak then it will results in flaking and/or total delamination of the paint system over time. A poor bond will seriously affect the abrasion resistance of the coating systems.

Bounce Back
Bounce Back refers to the rebound of atomized paint, especially when applied by conventional air spray methods. 

Bridging
Bridging is the formation of a paint film over a depression.

Brittleness
Brittleness is the lack of resistance of a paint film to cracking or breaking when bent or flexed. 



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