Spectol rubber

Sir i m using spectol rubber but i think this rubber is dead so pls guide me how to check that spectol rubber is dead or not...

Hi Shyam,

Spectol is a short pimple rubber.  It will last a long time.  One way to tell if it needs replacing is to look at the pimples and see if they are wearing.  They have little bumps on them when it is new.

The rubber may also start to discolour if it is red.