Overview
PUSHEN ISO-3 #flow cup is designed and manufactured according to the international standard ISO 2431-1993 "Determination of outflow time with flow cup for Paints and varnishes" and the national standard GB/T 6753.4-98 "Determination of outflow time of coatings - ISO flow cup method". This flow cup is used to test the outflow time of Newtonian or similar Newtonian liquids.
Features
1. Design and manufacture according to international standard ISO 2431 and national standard GB/T 6753.4 to ensure the standardization of testing.
2. The cup body is made of anodic oxidation aluminum, and the nozzle is made of stainless steel, which is sturdy and durable.
3. It is used to determine the outflow time of Newtonian or near-Newtonian liquids and can be converted into kinematic viscosity.
Principle
The ISO flow cup characterizes the flow characteristics of a liquid by measuring the time it takes for a volume of liquid to completely flow out of a specified diameter flow hole at the bottom of the standard cup under the action of gravity. There is a specific conversion relationship between the outflow time and the kinematic viscosity of the liquid, and the measured outflow time can be converted into a kinematic viscosity value (in mm ²/s or centistoke) through a formula.
Applications
Paint, varnish, Newtonian or near-Newtonian liquid
Standards
ISO 2431、GB/T 6753.4、ASTM D5125
Steps
1. Before or after measurement, repeatedly wipe the inner wall with fine gauze dipped in solution, twist it into a rope with soft paper, and repeatedly pull it clean in the outflow hole.
2. Put the flow cup on the bracket and adjust the bracket level.
3. Prepare a stopwatch with an accuracy of 0.1 seconds while holding the outflow hole with your hand.
4. Slowly pour the measured liquid with controlled temperature into the flow cup to avoid bubbles. When the liquid exceeds the mouth of the cup, scrape it flat with a scraper or Glass.
5. Start the stopwatch and quickly release the finger that presses the outflow hole. When the outflow liquid is interrupted, press the stopwatch instantly to record the outflow time.
Notice
• You need to bring your own stopwatch with an accuracy of 0.1 seconds.
• The flow cup bracket is an optional part, and the bracket level should be ensured before use.
• When pouring the tested liquid, it should be slow to avoid bubbles.
• After the liquid is filled, scrape the mouth of the cup with a scraper or Glass.
• In order to obtain more accurate data, the outflow time can be measured multiple times and the average value can be calculated.
• Viscosity conversion formula is: for ISO-3 #cup, kinematic viscosity V (mm ²/s) = 0.443 × t - (200/t), where t is the outflow time.
