MICROLAB is involved in testing the quality of paint as well as its adhesive properties to give suppliers the confidence to move ahead with the most economical option to suit the application with high accuracy and reliability. The application industry varies from automotive to earth movers as cost reduction and corrosion resistance is the order of the day. The list of paint properties include.
MICROLAB uses the Ford viscosity cup which is a simple gravity device that permits the timed flow of a known volume of liquid through an orifice located at the bottom. Depending on the kinematic viscosity, the rate of flow becomes directly proportional. It should be noted that the true viscosity during applications are sensitive to temperature so the testing done must maintain the right temperature for the liquid as well as the cup.
The procedure is as per IS-101 Part 1- Sec 5
Gloss and Finish
Customers prefer different finish to their products with varying level of shine and glossiness to the finish, which is a characteristic of the reflective property of the paint.
- The gloss level can vary from a dull to a full shiny look, and though the terms aren’t standardized, the common terminology is:
- Gloss – A highly shiny glossy finish which is very reflective
- Satin – (Also referred to as lustre, Semi Gloss or Pearl) – A soft sheen paper which is half way between Gloss and Matt.
- Matt – A totally flat finish with no sheen or reflective properties
Gloss can be used as a measure of the quality of the surface since the curing is affected that ultimately leads to poor adhesion for the coated surface. A glossmeter is used to measure the light that is incident on the surface at a particular angle. The intensity is then recorded based off the reflectivity and absorption of the surface.
The procedure is as per IS-101 Part 3 & 4 – Sec 4
Fineness of Grind
The material that makes up the paint is ground into fine particles for easy dispersion to the liquid medium. This physical property is termed as “grinds” which measures both the size of the particle as well as the amount of dispersion. We currently use Grind gages to help a variety of industries not limited to paint, plastic, pigment, coatings, paper, ceramic, food etc.
The procedure is as per IS-101 Part 3- Sec 5
The adhesion test measures the adhesion of organic coatings to smooth surfaces. The test material is applied at a uniform thickness and on drying, a rounded stylus that is loaded with increasing amount of weight is used to determine the value at which the coating is removed from the substrate
The flash point is the lowest temperature at which the vapors from a volatile material will ignite on application of a source. The sample is contained in an open cup which is heated and, at intervals, a flame brought over the surface. The measured flash point will actually vary with the height of the flame above the liquid surface and, at sufficient height, the measured flash point temperature will coincide with the fire point. This property can provide suppliers with a measure of the safety hazard.
The procedure is as per IS-101 Part 1- Sec 6
A volume Solid is a measure of the volume of solid film-forming ingredients in a can of paint, or the material that remains when the paint has dried. This denotes the true volume of the paint and is an indicator of the quality of the paint used and cost comparison.
The procedure is as per IS-101 Part 8 -Sec 6
Dry Film Thickness
DFT is the thickness of a coating as measured on top of a substrate. This can either be a single layer or multiple layers. The coating thickness is measured only after the paint has dried and should follow recommended coating parameters. This property plays a part in the corrosion prevention of the substrate and influences the durability of the coat.
The procedure is as per IS-101 Part 3 – Sec 2
Wet Film thickness
WFT is the thickness of wet paint that is liquid based, which is maximum after application of the coat and before the volatile materials are lost. This property needs to be determined so that the right amount of paint is used to avoid the substrate coming in direct contact with the corrosive environment. MICROLAB ensures that the right timing is followed for the measurement as this is sensitive right after the point of application of the paint, thus preventing film contamination.
|S.No||Specific Test Performed||Test method specification against which tests are performed|
|1||Consistency||IS-101 –Part 1-Sec 5|
|2||Viscosity –ford Cup – 4||IS-101 –Part 1-Sec 5|
|3||Mass in Kg/10 Litres||IS-101 –Part 1- Sec 7|
|4||Drying time||IS-101 –Part3- Sec1|
|5||Finish||IS-101 –Part3- Sec 4|
|6||Gloss||IS-101 –Part4- Sec 4|
|7||Fineness of Grind||IS-101 –Part3- Sec 5|
|8||Colour||IS-101 –Part4- Sec 2|
|9||Water Content||IS-101 –Part2- Sec 1|
|10||Scratch Hardness||IS-101 –Part5- Sec1|
|11||Flexibility and Adhersion||IS-101 –Part5- Sec 2|
|12||Flash Point||IS-101 –Part1- Sec 6|
|13||Volume Solids||IS-101 –Part8- Sec 6|
|14||Phthalic Anhydride content||IS-101 –Part8- Sec 4|
|15||Accelerated Storage Stability Test||IS:8662:2004|
|16||Resistance to Acid and Alkali||IS:8662:2004|
|17||Volatile Matter||S-101 –Part2- Sec 2|
|18||Hardness Test – Pressure Test||IS-101 –Part5- Sec1|
|19||Acid Value||IS-101 –Part9- Sec1|
|20||Rosin Test-Liebermann starch test||IS-101 –Part9- Sec2|
|21||Ash Content||IS-101 –Part8- Sec3|
|22||Pigments and Non-Volatile Matter||IS-101 –Part8- Sec2|
|23||Residue on Sieve||IS-101 –Part8- Sec1|
|24||Resistance to Heat||IS-101 –Part7- Sec3|
|25||Resistance to humidity under condition of condensation||IS-101 –Part6- Sec1|
|26||Film Thickness – Method – 3t||IS-101 –Part3- Sec 2|