On 16/04/2011 18:36, alex4459jopiklal44 wrote:
>
>
>>
>> The problem might be caused by light getting through the back of the
>> board, if they are not stored in light-proof packaging.
>>
>> Leon
>> --
>> Leon Heller
>> G1HSM
>>
> a second thought...hmm do you mean, through the copper ?? dont hope so :)
> but I had a job where it was custom to store the boards in a refigerator
> as the door was standing open in summer, there had come water on the boards..they did not work and they were new.. so from this, I think that moisture can get through the cover and maybe the humidity in air is the worst problem with storage.. not light-or temperatur differences ..but it was mainly the part had had water on the cover that was realy bad.
The copper is covered in black plastic. I meant light getting through
the back of the board - FR4 is translucent.
Leon
--
Leon Heller
G1HSM