On Jan 14, 2020, at 6:34 AM, Tan Geok Ang wrote:

> Will really appreciate advice on the following;
>
> a) how much of sulphur/calcium, etc. on gloves/ESD Mat is  
> acceptable and what level is considered harmful in handling of PCBA/ 
> module with sliver plated surface
>
>
> b) whether there are any “standards” or references for “compliance”  
> check for sulphur, and is there such measurements professionally  
> carried out
>
>
> c) What will be the impacts on the PCBA when silver plating become  
> tarnish?
>
>
> There are sulphur free gloves but it is not easily accessible/ 
> available in Singapore and it is expensive.
>
>
> Thanks.
>
>
> GA Tan