Effect of lubricant

what is the effect of lubricant on disintegration time?

Increase of the lubricant concentration in tablet formulation can create a barrier between tablet granules or particles and the disintegrating liquid of interest, resulting in an increase of disintegration time of the tablet.

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how it can be prevented?

Optimum amount of concentration validated by R&D team.

low concentration
minimum mixing at the end

hydroplhilic lubricants eg sodium steryl fumarate may also be used

How increase in lubricant increase tablet hardness?

tablet hardness is decreased

Here they said that it increases

Check lowering of hardness.
When too much qty is used it may give opposite results instead of giving its true results.
same like super disintegrent cross carmelose sod give result up to 8% and at higher qty it retard disintegration