OIL PENETRATION TESTING APPARATUS

(Williams Type) (Conforms to ASTM Standard D202-49T)

PURPOSE :

The apparatus is designed for determining the penetration time of oil or other liquid through paper and some other flat materials.

APPARATUS:

A WILLIAMS standard tilting type penetration testing testing apparatus consist of a chamber with

Orifice  6.03 cm diameter for holding the liquid medium (caster oil which has a viscosity of approximately  700 ± 30 centipedes at 25⁰ C) and a clamping device for holding the paper. Digital temperature of 35 ± 1⁰C. Apparatus consists automatic digital timer for measuring the penetration time in seconds.

PROCEDURE :

The penetrometer shall be filled with standard castor oil to a depth of 3 ± 0.1 mm below the level of the orifice when when the penetrometer is in the horizontal position. The orifice shall be close with a polyster sheet and the castor oil is brought to a temperature of 35 ± 1⁰C by the digital temperature indicating cum controller.

A rectangular specimen of the sample of paper to be tested shall be cut 24 x 10 cm in size, so that two tests can be carried out conveniently side by side on the same specimen. On one  half the test  shall be carried out “wire” side and the other half the paper shall be  reversed and test carried out “face” side down.

The clamp of the orifice of the penetrometer shall be opened, checked the oil temperature 35 ± 1⁰C and excess oil wiped off the edge of the orifice and clamp area. Tilted the oil container by removing the catch, the oil gets contact with the paper and digital term stars automatically. When oil penetrate through paper 99% area, lift up the oil container horizontally by hand, then digital timer stop automatically and note the time of penetration.

Then repeat the test on the other half of the test specimen after reversal of the paper from the “wire” to the “face” side down as same and note the time of penetration of oil from the paper and takes the average of the two timing seconds.

Record the clasped time as the time of oil penetration in seconds.          

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