Performance test table for coatings
name | unit | illustrate |
viscosity | Second(8) | With coating-1When the coat-4 viscometer is determined, a certain amount of sample is taken at a certain temperature From the specified diameter (Tu-1 viscometer is 5.60+0·02mm, coating _4 viscometer is 4:, 0. 02 mm) of the drain in the mouth of the drain in the required time |
When measured with a falling ball viscometer, the time (seconds) required for a steel ball of a certain size to fall vertically at a certain temperature and pass through the scale marks on the upper and lower sides of the glass tube containing the paint sample | ||
Krebs units (KU） | When measured with a Stomel viscometer, the required load of 200 rpm is generatedA logarithmic function. This method is generally only used to measure brushed and roller-coated architectural coatings | |
Fineness | microns (μm） | ( 1Paint grinding fineness: The reading obtained on a standard fineness gauge under the specified test conditions, i.e., the depth of the fineness gauge, expressed in microns (μm). Numerical pronouncing of small paint "particles"; The smaller the finer, the better the fineness (2) Measure the fineness of the paint with a scraper Fineness Meter, which is expressed in meters (μm). |
consistency | cm(cm） | When determining the consistency of thick lacquer or lacquer, a certain volume of sample is taken, a fixed pressure is applied to it, and after a certain period of time, the sample spreads into a circle or structure. Its modulation is expressed in centimeters (cm) of the diameter of the circle (or the average of the long and minor axes of the circle). numeric valuehealThe smaller, the greater the consistency |
Drying time | Hour (h) or min | Under the specified drying conditions, the time when the surface layer is formed is the "surface drying" time, and the time when all the solid coating film is formed is between the time of "actual drying" ("drying") and the time of "actual drying" ("drying") is between the hours (min) l, which is expressed in hours (h), minutes (mn) or seconds (s). |
Solids content | Percentage (%) | The weight of the residue after heating and baking a certain amount of paint sample Go at a specified temperature is G1, then (G1/GOx l00% is the solid content of the sample |
hardness | Pencil number | The hardness of the coating film is indicated by the number of pencils that can penetrate the thickness of the paint film to the bottom surface according to the operation method specified in the standard. The Chinese brand high-grade drawing pencils are commonly used in the measurement, which are divided into 13 gears of 6H, 5H, 4H, 3H, 2H, H, HB, B, 2B, 3B, 4B, 5B and 6B. The hardness is up to 6H and the minimum is 6B |
When measuring the hardness of the double pendulum type damping test, the time required to swing a certain amplitude (such as from 5°~2° angle) on the double pendulum with a certain weight is t, and the time required to swing the same amplitude on the double pendulum is toThe ratio of X, which is the hardness of the coating film, X=(t/t0) 。 Therefore. X is unitless, and the coating film is softer than the glass ring, t< to。 X is a decimal less than 1. If K is large and close to 1, the hardness of the coating film will be greater | ||
seconds (s） | When the hardness is determined by the single pendulum method, the damping time of the Koenig standard from 6° angle to 3° angle on the surface of the measured coating film, or the damping time of the Posatz pendulum from 12° angle to 4° angle is asked, indicating the hardness of the coating film. Damping time is long, hardnessexceedbig | |
Cupping test | mm(mm） | The cupping test can determine the performance of the coating film after gradual deformation, and the performance of high resistance (and substrate). The test can be carried out at the specified indentation depth to assess whether it passes or not; It is also possible to increase the depth of indentation step by step to observe the minimum depth when the coating film has just begun to open or when it has just begun to elevate from the substrate. The higher the number (millimeters), the better the performance |
rush hit strong degree | Kilogram·centimeter (kg·cm) or centimeter (cm) | When measuring the impact strength (i.e., impact resistance) of the paint film with an impact Tester, the impact strength of the paint film is expressed by the product of the maximum height of the paint to be damaged by the weight of the weight of the paint film (1 kg) and the weight of the hammer, kilogram·centimeter (kg·cm). If the weight of the hammer is 1 kg, the impact strength is expressed in centimeters (cm). |
attach make move force | Level (Circle Method) | When measuring with an adhesion Tester, the rotary needle draws a continuous round rolling line on the paint film, and then evaluates the integrity of the paint film within the scratch range of the circular rolling line, which is divided into 7 grades, and L grade is better |
Level (Gridded） | When the adhesion is determined by the grid method, the paint film is cut according to the grid pattern, and just penetrates to the substrate, and then according to the integrity of the paint film in the grid pattern (such as separation, peeling, falling off, etc.), its adhesion is evaluated, and it is divided into six grades: 0, 1, 2, 3, 4, 5, and it is better to take 0 grades | |
Flexibility | Millimeter (mm) | When measuring the initial flexibility of the paint film with a shaft rod Tester, the metal plate coated with the paint film is bent on the shaft rod of a certain diameter, and its flexibility is expressed by the radius (mm) of the smallest shaft rod that does not cause the damage of the paint film. The flexibility is divided into seven grades: 1, 2, 3, 4, 5, 10, and L5 mm, with 1 mm being better |
Millimeter(mm) | The sample 1 of the fat film made according to the standard is bent on the putty flexibility Tester to observe whether there is a crack or falling off, and the minimum diameter (mm) of the bending arc is used to indicate its flexibility, and the smaller the value, the better the flexibility | |
Abrasion resistance | g (g) | When measured by the paint film wear resistance instrument, the weight loss of the paint film after the specified number of grinding times under a certain load is expressed, and the greater the weight loss, the worse the wear resistance |
g/m 2(g/m2 ) | The minimum amount of paint used to evenly coat the surface of the object so that the base color is no longer present is the paint hiding power. The lower the number, the better the coverage | |
color | number | When measuring the color of varnish, clear oil and diluent with an iron pin colorimetric meter, l8 standard color scale solutions are prepared by ferric chloride, cobalt chloride and hydrochloric acid in different proportions to be compared with the test samples, and the color of the nearest industry color scale solution is used as the color of the sample, and the number of the color scale solution is expressed, the smaller the number 1, the lighter the color |
luster | Percentage (%) | When measuring the gloss of the paint film with a solid angle photoelectric coating meter, it is expressed as a percentage of the ratio of the "positive reflected light" from the surface of the paint film to the "positive reflected light" from the surface of the standard board under the same conditions. If the positive reflection and light amount of the paint film surface are equal to the surface of the standard board, the gloss of the paint film is 100%, and the gloss is the highest |
Acid value (acid value) | Milligram KOH/g (mgl00H/g) | In the determination of the acid value of lacquer base for pigment paint and varnish, the number of milligrams (mg) of potassium hydroxide (KoH) required to neutralize the free acid in the non-volatile matter of 1 gram of product is expressed as its acid value, which can be written as .mgK0H/g, milligram K0H/g, the larger the value, the greater the acid number, and the more free acid it contains. |
Gelling number | Milliliter (ml) | The diluent, moisture-proof agent to be measured, according to the standard provisions, is prepared into nitrocellulose solution or perchloroethylene resin solution, and then gradually drops into paint solvent oil or absolute ethanol, mixes well, and the amount of paint solvent oil or anhydrous ethanol that drops when nitrocellulose or perchloroethylene resin is precipitated represents the gelling number of the tested diluent or moisture-proof agent. The larger the gelling number, the stronger the solubility of nitrocellulose or perchloroethylene resin. |
Breakdown voltage | kilovolts/mm(kV/mm) | Under certain conditions, the AC voltage is applied to the paint film in a continuous and uniform boost mode to break down the paint film, and the voltage value is called the breakdown voltage, which is commonly expressed in kilovolts (KV). The ratio of normal voltage to the thickness of the paint film is the breakdown strength of the paint film, and it is commonly used as a unit of measurement in kilovolts/millimeters (kV/m). The higher the breakdown voltage, the more insulating the coating isGood. |
Arc resistance | Second(s) | When measuring the arc resistance of the paint film, the continuous high-voltage and low-current arc is applied to the paint film with an arc resistance meter until the paint film is burned through and conducted, and the time required to burn the arc to the first conduction indicates the arc resistance of the paint film, and the longer the time, the better the arc resistance |
electrical conductivity | Microohm 1/cm (μΩ) - 1/cm) | Conductivity (conductivity) is a measure of the electrical conductivity of an object (such as metals, paints, solvents, etc.) and is the reciprocal of resistivity. In electrophoretic paint testing, microohm one l/cm is commonly used as a unit |
Volume resistivity and surface resistivity | Eu centimeters (Ω· cm) and Euro (Ω) | The volume resistivity and surface resistivity of the insulating paint film are the physical quantities that measure the insulation properties of the paint film. In the coating performance test, the volume resistance and surface resistance are measured by a high-resistance meter, and the volume resistivity is calculated to be calculated in ohm centimeters (a·cm) and surface resistivity, in ohm (Ω) |
Swimming permeability | cm(cm） | The swimming permeability in electrophoretic coating refers to the coating ability of the coating to the parts of the coated object that deviates from the cathode (such as the inner surface, concave surface, bell gap, etc.) under the action of the electric field, and is expressed in the height of the swimming paint in centimeters (cm). The higher the value, the higher the permeability and the greater the coating capacity |
Chemical, corrosion and weather resistant | Level, hour, day, month, or pass | In the chemical resistance, corrosion resistance and weather resistance of the coating film, indirect methods are mostly used, and the results are mostly comparative. Generally, there are three situations: 1) determine the test conditions and time, and classify the paint film change and damage degree; 2) Determine the test conditions and time, check the changes and damage degree of the paint film, and then compare the product standards to determine whether it is qualified and passed; 3) Determine the test conditions and observe how long there is no change (or some bandows can be restored within a few hours after stopping the test), then the test results can be written as resistance (oil, water, acid, alkali, etc.) for a few hours or a few years. Commonly used performance performance includes: chemical resistance and other reagents (acid, city, salt); Resistance to water (boiling, distilled, salt, seawater); Heat resistance, cold resistance, damp heat resistance, temperature resistance alternating variation, oil resistance, mold resistance, salt spray resistance, atmospheric resistance, temperature and humidity alternating variation resistance, etc |
