I've seen the stickyness of silicone products myself on a few items that I've purchased. It don't think it's the humidity as these items were stored in a dry drawer in the house, but not used for a while. With regard to Silicone it comes in two types as I understand from a chemist I used to work with: cured and uncured. The uncured silicone gives off vapours that poison gas detection sensors for flammable gasses (Pelistors). This I do know after working at Crowcon. James James Head BEng MIET CID+ James Head PCB Design and Engineering 11 Charmind Walk,Winterbourne Road, SWINDON, SN25 1QA Telephone: 01793 266237 Mobile: 07870 945579 Skype: headjames E-mail: [log in to unmask] Website: www.jameshead.co.uk On 18 July 2017 at 16:01, Yuan-chia Joyce Koo <[log in to unmask]> wrote: > correction, now think back, I did wear it during shower... so it most > likely exposed to soap or shower gel... jk > > On Jul 18, 2017, at 10:51 AM, Yuan-chia Joyce Koo wrote: > > the problem is mould release silicone, i believe it is small molecule and >> easy to migrate and contaminate parts or assembly. I didn't realize lance >> armstrong bands are part of that... it did degrade after few years of >> use... I got two, one become somewhat sticky (never intentionally exposed >> to any chemical or put in to laundry machine). so there are two issues >> (IMHO), one is the mould release, the other is the stability of the >> silicone band - many watches use that, not just fitbit... look like your >> customer do have a point... >> regards, >> jk >> On Jul 18, 2017, at 10:23 AM, Sue Powers-Hartman wrote: >> >> Thanks for the reply Steve. >>> We had a military customer some 10 years ago specifically call out the >>> Lance Armstrong bands. They did not want anyone working on their product to >>> wear those silicone bands. >>> My understanding is that the Fitbit bands are made of elastomer material >>> and am not sure what makes that different than silicone. When I look that >>> up, it says that an elastomer is a silicone. The feel of the two are very >>> different. >>> Many at work wear Fitbit watches. But there are several individuals, one >>> of who is an engineer, that believes any one working on the production >>> floor should not wear one. >>> I am looking for a definitive answer, but have not been able to find one. >>> >>> Sue >>> >>> From: Steve Gregory [mailto:[log in to unmask]] >>> Sent: Monday, July 17, 2017 4:26 PM >>> To: TechNet E-Mail Forum <[log in to unmask]>; Sue Powers-Hartman < >>> [log in to unmask]> >>> Subject: Re: [TN] Fitbit watch band >>> >>> Hi Sue, >>> Here is something you might read. It may have something to do with this >>> NASA advisory from a while back... >>> >>> http://www.spaceref.com/news/viewsr.html?pid=16511 >>> Steve >>> >>> On Mon, Jul 17, 2017 at 4:03 PM, Sue Powers Hartman <[log in to unmask] >>> <mailto:[log in to unmask]>> wrote: >>> Several individuals have asked me if the Fitbit watch band is a danger >>> if around the manufacturing of circuit cards, since the band is a type of >>> silicone. Does anyone have an answer to this. >>> Thank you >>> >>> >>> >>> -- >>> Steve Gregory >>> Kimco Design and Manufacturing >>> Process Engineer >>> (208) 322-0500 Ext. -3133 >>> >>> [Image removed by sender.] >>> >>> This email and any attachments are only for use by the intended >>> recipient(s) and may contain legally privileged, confidential, proprietary >>> or otherwise private information. Any unauthorized use, reproduction, >>> dissemination, distribution or other disclosure of the contents of this >>> e-mail or its attachments is strictly prohibited. If you have received this >>> email in error, please notify the sender immediately and delete the >>> original. >>> >>