IS 310, 1203 , 1448
to determine grade of bitumen . The penetration test
determine consistency of bitumen for the purpose of
grading : Depth units 1/10 of milimeter to which is
standard needle having a standard weight will penetrate
vertically in a duraion of five seconds at temperature
of 25 C determines penetration of graduation .
SPECIFICATION: It consists of a vertical pillar
mount5ed on a base provided with leveling screw. The
dial is graduated in 400 1/10 and the millimeter subdivision
and the needle pointer against figures makes easy reading
. Supplied with a bitumen penetration needle, brass
cone and weight 50 gms,100 gms( one each) and two samples
ACCESSORIES AT EXTRA COST.
PENETRATION Cone for empirical estimation of penetration
of lubricating grease, petroleum jelly etc.
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