At 5.00pm 150197 , a supplier of soldermask ink informed me that different
ink have different composition of photo-initiator and because of the variation
in the amount of photo-initiator it contains , a lower exposure energy is
required
for those with high level of phot-initiator and vice versa .
Although majority of soldermask ink supplier TDS mentioned an approximate
300mj/cm2
of exposure energy needed during the process of photo- initiation ,sometimes
this
does not work . Any comments is much welcome .Thanks .

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