ASTM D5909-20,Standard Test Method for Drying Time of Oxidative-Drying Printing Inks by Squalene Resistance.ASTM D5909-20 pdf free download.
ASTM D5909-20 covers the procedure for determining the drying time of oxidative-drying printing inks (also referred to as “sheetfed inks”) by squalene resistance of printed ink films.
ASTM D5909-20 is applicable to all paste inks that dry primarily by oxidation regardless of the substrate on which they are printed. With appropriate changes in the test fluid, it may also be used with paste inks that dry by other mechanisms, such as heatset or ultraviolet light.
Referenced Documents
ASTM D4332 Practice for Conditioning Containers, Packages, or Packaging Components for Testing;
ASTM D5264 Practice for Abrasion Resistance of Printed Materials by the Sutherland Rub Tester.
4. Summary of Test Method
4.1 The test print is affixed to the base of the rub tester. The removable one-half pound weight of the instrument is fitted with a piece of rubber blanket and covered with an absorbent towel to which a small amount of squalene oil has been added. The weighted, oil-impregnated towel is allowed to rub back and forth over the test print for a preseribed number of cycles.
4.2 The receptor towel is examined for evidence of ink transfer from the print. Results may be related qualitatively to an agreed upon standard, or, the intensity of the stain can be measured quantitatively with a colorimeter, spectrophotometer,or other reflectance type device.
Procedure
10.1 Using the manufacturers instructions, ink up the laboratory printing apparatus and pull a print on the agreed upon substrate. Measure the optical density.If not within +0.05 of the desired value,discard and apply more or less ink to the print maker. Prepare a sufficient number of prints so that after cutting, there will be a minimum of six specimens each about 47 by 115 mm. Record the time of printing on each specimen.