This test helps in determining the ability of a coating to resist degradation due to mechanical wear by hard and rough objects. Abrasion resistance can be enhanced by incorporation of surface modifying additives.
Adhesion testing in the paint and coating industries is necessary to ensure the paint or coating will adhere properly to the substrates to which they are applied.
This test helps in determining the degree to which a paint resists reaction with alkaline materials such as lime, cement, plaster, soap, etc.; a necessary property for paints in bathrooms, kitchens, laundries.
This test helps in determining the corrosive performance of decorative copper/nickel/chromium or nickel/chromium coatings on steel, zinc alloys, aluminum alloys, and plastics designed for severe service. It is also applicable to the testing of anodized aluminum.
This test helps in determining the ability of a coat to resist chemical deterioration or staining.
This test helps in determining the resistance of surface coatings (paint, clear coats, metallic plating, etc.) to chipping caused by the impacts of gravel or other flying objects.
This test helps in determining the hardness of paint coat.
The proper and effective preparation of a surface prior to coating is essential. Making sure that the correct roughness â€“ or profile â€“ has been generated is essential. If the profile is too low, the adhesion of the coating to the surface will be reduced. Too high and there is the danger that the profile peaks will remain uncoated.
This test helps in determining the resistance of organic coatings by controlled condensation. Condensation is produced by exposing the test surface of the sample to a heated, saturated mixture of air and water vapor, while the reverse side of the sample is cooled to room temperature air.
This test helps in determining the adhesion of a large variety of coatings.
This test helps in determining the corrosion degradation of coating systems for steel bridges.
This test helps in determining when, where, and how the paint or coating failure occurred.
The ability of a pipe coating to resist mechanical damage during shipping, handling, and installation will depend upon its impact resistance. This test method provides a systematic means for screening coating materials with regard to this property.
This test helps in determining the ability of a coating system to withstand the stresses of fabrication. Organic coatings on precoated sheet are subjected to stresses when fabricated into products by roll forming, brake bending, or other deformation processes. These stresses can exceed the flexibility or adhesive strength of the coating, resulting in fracture of the coating which exposes the substrate, or in the loss of adhesion of the coating to the substrate.
The abrasive is allowed to fall from a specified height through a guide tube onto the coated panel until the substrate becomes visible. The amount of abrasive per unit film thickness is reported as the abrasion resistance of the coating on the panel. Both silica sand or silicon carbide can be used.
FTIR, which can serve as an important â€œfirst-lineâ€ analysis tool for the identification of coating types and drying mechanisms via monitoring of the functional groups on the chemical compounds inherent in the formulation.
Gloss measurement is essential instrument where a cosmetic appearance of the coating finish is required. It measures, guide to control and test right from matt to mirror finish accurately. Multi directing a beam light at a specific angle to the test surface and measuring the amount of reflection determine gloss. For general gloss measurement the 60Âº angle is recommended.
Impact performance after painting/printing can be tested with several impact tests, like a puncture test or a falling dart test.
This test helps in determining the total water content of paints using a calcium hydride reaction test kit, or water content between 2 and 85 % water.
This test is used to measure resistance to cracking (flexibility) and adhesion of attached organic coatings on substrates of sheet metal or rubber-type materials.
The penetration resistance is of special importance to architectural finshes. The ability to maintain a uniform appearance (color and gloss) on substrates with varying porosity can be evaluated by applying the paint over a test chart which has a coated and uncoated area. Thus, the penetration resistance is tested under severe conditions. The penetration resistance is visually evaluated and can also be objectively evaluated by measuring color and gloss.
The salt spray test is a standardized test method used to check corrosion resistance of coated samples.
The scratch resistance can be established e.g. in the Taber abrasion test, where the amount of haze is established after a number of abrasive cycles. The scratch resistance can also be determined quantitatively by measuring the weight loss after a number of sanding cycles. The pen test determines the indentation caused by a sharp pencil applied with a defined force.
This test helps in determining the resistance of paints to erosion caused by scrubbing. Although scrub resistance tests are intended primarily for interior coatings, they are sometimes used with exterior coatings as an additional measure of film performance.
One of the most important properties of a thin film coating is the adhesion (interfacial forces between two surfaces) between the coating and the substrate. The most common method of accurate measurement of thin film coating adhesion is the scratch tester.
This test helps in determining the ability of a paint or coating to resist deterioration of its physical and optical properties caused by exposure to light, heat, and water can be very significant for many applications. This practice is intended to induce property changes associated with end use conditions, including the effects of sunlight, moisture, and heat. The exposure used in this practice is not intended to simulate the deterioration caused by localized weather phenomena such as atmospheric pollution, biological attack, and salt water exposure.
This test helps in determining the weight percent volatile content of solvent-reducible and water-reducible coatings.
The amount of water that paint coat could absorb is measured by the water content test.
Water can cause the degradation of coatings, so knowledge of how a coating resists water is helpful for assessing how it will perform in actual service.