Automatic Digital Pull-off Adhesion Tester

Description:

There are currently three main methods for testing the adhesion between coatings and substrates, namely: circle cutting method, grid cutting method, and pull off method. Both the circle drawing method and the grid drawing method can only rate adhesion, and cannot quantify the results specifically; The pull-out method can quantitatively describe the specific size of adhesion, which is clear and concise for evaluating the adhesion size of different coatings. It is very suitable for R&D personnel to use when developing formulas.

The fully automatic digital pull-out adhesion tester NT 500/3 is the latest intelligent adhesion testing instrument developed by our Nitoplab. It uses hydraulic pressure to perform pull-out testing on specific areas of coatings. The entire pull-out process is automatically completed by the instrument, and the pull-out speed is stable and controllable, avoiding errors caused by unstable speed due to manual pressure; The pull-out force can be accurately displayed on a digital display, and there are three different units to choose from: Mpa, Psi, and KN; The instrument can set an upper limit for pressurization and apply precise pressure to the sample; After reaching the set pressure, the holding time can be set to evaluate the durability performance of the sample under a certain pressure.

NT 500/3 complies with the requirements of GB/T5210, ASTMD4541/D7234, ISO 4624/16276-1 and other standards. It is a pioneer in China and has the characteristics of simple operation, accurate data, low maintenance cost and supporting consumables price. It is widely used for adhesion testing between different coatings in some concrete base coatings, anti-corrosion coatings or multi coating systems.

Features:

◆ Portable design, built-in rechargeable lithium battery, no need for external power supply, suitable for use in construction, production sites, and laboratories;

◆ 5.0 inch IPS big touch screen, display pull-off force curve, operator can see clearly how it change throughout the test.

◆USB storage technology, standard USB interface, can directly copy stored experimental data after connecting to a computer, without the need to install additional driver software, making it easy and convenient to use;

◆The machine has a built-in real-time clock, and all saved data has corresponding experimental dates and times; Convenient for users to summarize and manage experimental data;

◆The pull-out spindle sizes provided for products with different adhesive strengths are circular 10, 14, 20, 50mm, and square 50mm, which expands the functionality and resolution of the instrument;

◆Each instrument is calibrated with a CMA traceable pressure sensor before leaving the factory, with an accuracy of 1% of the full range;

Internal storage of pull-out data, including maximum pull-out force, pulling rate, testing time, and size of pull-out spindles;

◆ Simply press the button to select the size of the pull-out unit, change the measurement unit or store the reading: · No conversion table is required, the instrument automatically calculates the pull-out force according to the size of the pull-out unit;

The pull-out unit uses cost-effective and high-quality aluminum spindles that meet international standards;

The aluminum automatic centering pull off unit ensures that the pull off force is evenly applied to the test surface during smooth or uneven surface testing, preventing unilateral pull off.

◆Pressure sensors used in advanced industries ensure the continuity of accuracy;

5 inch IPS touch screen display, with adhesion testing between different coatings in MPa, psi, and KN systems;

◆ With the function of displaying the pulling force curve, it can clearly observe the changes in pulling force throughout the entire pulling process;

Electric drawing spindle, which can save force while ensuring stable and adjustable drawing speed, and improve data repeatability;

◆ With pressure holding function, the test can be judged whether the test has passed by testing the pulling force holding time of the coating under the set tension.

Test Principle

Coating or a multi-coat system of paint is applied/distributed to substrate uniformly with a certain thickness.

After coating has been dried or cured, adhere dolly to surface of coating directly with special adhesive.

After the adhesive is cured, use NT 500 digital pull-off adhesion tester to attach the loading fixture and aligned to apply tension perpendicular to the test surface. Tester pull off the dolly at a speed of 1MPa/s by hydraulic pump, and measures the force required to pull a specified test diameter of coating away from its substrate using hydraulic pressure, this force is shown through the LCD of tester.