First, do you like to be call GA or Tan?
a) & b) There are no standards. Shoot, we don't have any "official"
standards for sodium, potassium, fluoride, chloride, bromide, nitrate,
nitrate, phosphate or sulfate; unless they are in IEC standards that I don't
know about.  We have the suggestions of Doug and Terry from the last century
and those from Delco and a couple of other sets.
Certainly the measurement of Doug Pauls, etc. are professionally carried
out. 
c) Only cosmetic

I have never heard anyone ask for sulfur free gloves. I am not aware of what
is available. I would start with asking a VWR or Fisher rep (large chemical
suppliers with extensive catalogues) .

Regards,
Bev


-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Tan Geok Ang
Sent: January 14, 2020 6:34 AM
To: [log in to unmask]
Subject: [TN] Need advice : sulphur level on Gloves/ESD mat and reference
standards

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