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Exterior architectural gloss coatings pigment selection
There are two primary types of TiO2 pigments: those which enamel grade performances below Critical Pigment Volume Concentration (CPVC), which corresponds to gloss and semi gloss powder coatings, and those improving spacing characteristics for above CPVC coatings applications (flat aspect). Exterior architectural gloss coatings pigment selection is based upon a good balance of properties associated to tight Particle Size Distribution which enables product to provide superior exterior high gloss. Within the extensive choice of pigments, the main ones for thisRead More …
Thermal Spray Powder Coatings for Resistance to Erosion
The selection of coating for erosive wear is dependant on the severity and type of erosion. For solid impingement erosion at a shallow angle of attack where the wear is similar to that of abrasion, high hardness coatings are required. For solid impingement angles near 90 coating toughness becomes more important. For cavitation and liquid impingement generally, a coating with good surface fatigue resistance is needed. The following coatings are commonly used: Cermet coatings like tungsten carbide/cobalt Chromium carbide/nickel chromiumRead More …
Reducing Wear by Using Powder Coatings
Thermal spray powder coatings have and are used in a very broad range of wear resisting surfaces and for the repair of wear resisting surfaces. The main advantage being that thermal spray coating can provide the surface properties and the component substrate material can be chosen from the bulk requirements be it strength, weight or cost without the need to consider it’s inherent wear resistance or other surface properties. Selection of the best coating for an application is not oftenRead More …
Safety control during powder coating application
SUPPRESSION EQUIPMENT The application of ” Explosion Suppression Equipment ” such as a fire extinguishing system that commonly uses halogen gases propelled by pyrotechnic devices can stop an explosion from occurring within the collection system. CONTROL OF DUST Design of the spray booth and recovery system can aid in worker safety. The booth opening, velocity of airflow must be arranged to assure the capture and containment of over-sprayed powder. The fan capacity of the recovery system must be sized toRead More …
Three primary resins used in thermoplastic powder coatings
There are three primary resins used in thermoplastic powder coating, vinyls, nylons and polyesters. These materials are used for some food contact applications, playground equipment, shopping carts, hospital shelving and other applications. Few of the thermoplastics have the broad range of appearance properties, performance properties and stability that are required in applications that use thermoset powders. Thermoplastic powders are typically high molecular weight materials that require high temperature to melt and flow. They are commonly applied by fluidized bed applicationRead More …
There are many commercially available masking materials for powder coated parts.
Masking is a very important step in the powder coatings process. It is labor intensive and expensive. The type of masking material and its properties will be important to the effectiveness of the mask and its impact on production efficiency. There are many commercially available masking materials for and powder coated parts. Tapes, plugs, caps and steel fixtures can be used. These cost and benefit issues are considered to determine the best possible way to mask a part: the cost per mask the numberRead More …
VOCs or HAPs per weight of solids
The older regulations were concerned with VOCs,while the newer ones have been written with the focus on HAPs.The calculation methods are very similar. The description below is written in terms of VOCs,but the formulas apply if everything applying to VOC solvents below is taken simply to apply to HAP solvents. Another way to handle the presence of non-VOCs is to calculate the ratio of the weight of the VOC solvents to the weight of the solids, rather than to theRead More …
Conveyorized Systems for powder coating application
Before considering the design and implementation of a conveyorized powder coating system, a few questions need to be answered. Proper design begins with preparation and research. Where will the system be built? Location is essential for efficient transportation of products to and from the powder coating powder facili ty. What is the available floor space? As you begin designing the powder application system, it’s important to have a clear understanding of the facilities floor space and the location of eachRead More …
What is the strength of powder coatings
Strength Powder Coatings generally have poor strength, ductility and impact properties. These properties tend to be dictated by the “weakest link in the chain” which in coatings tends to be the particle or grain boundaries and coating/substrate interface. Coatings are limited to the load they can carry, and thus require a substrate for support, even then, coatings are poor when point loaded. Internal tensile coating stresses generally adversely effect properties. Effective bond strength is reduced and can be destroyed byRead More …
Mechanisms of corrosion protection inferred by Anodic Coatings fall into two classes
Anodic Coatings Anodic coatings for the protection of iron and steel substrates are almost entirely limited to zinc and aluminium coatings or their alloys. Where coatings anodic to the substrate are applied, the corrosion protection is referred to as cathodic protection or sacrificial protection. The substrate is made to be the cathode and the coating the sacrificial corroding anode. The mechanisms of corrosion protection inferred by these coatings fall into two classes: Cathodic or sacrificial protection A barrier to theRead More …
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