silicone outgassing 101 required, please!

[nigelt]

I have noted concerns vis-a-vis outgassing in space/vacuum apps, when silicone based materials are used in enclosure components. I have some questions on this w.r.t. "sealed" enclosures, let's say IP'X'6 & above in the typical -20 +60 degC env...
1 - what, in the bigger picture is the deliterious effect please? I note mention of optics and I'm curious about that, but what about electronics in general.
2 - silicone keypads are often used in "sealed" electronics. I am aware that there are problems with poorly conditioned, low quality, silicone, in respect of switch failure, but are there other farther reaching effects?
3 - what if the sparkys want to use RTV to secure large components in a "sealed" enclosure? I think this is a different question perhaps, as the products of the curing process also come into the mix. I'm sure these continue to release over time. Aren't there 2 types?

Thanks in advance for any input or pointers to websites I should have found for myself!!
Nigel

"You will master any feeling of inadequacy you may be having"
....from my fortune cookie @ the buffet!

 

[Ron07663]

There is an 'electronic' grade available for one part silicone that does not corrode copper like the standard silicone calk does.
The two part silicone generally is safe around electricals as it cures. Best to contact the manufacturer for application assistance.

 

[itsmoked]

3- Yes there are two types.

Regular which has acetic acid as the curing product which toasts any circuitry and your eyes.

Electrical grade that has ethanol as a reaction product which of course doesn't corrode stuff.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[Tunalover]

nigelt-
The outgassing creates undesireable films on optical components.


Tunalover

 

[israelkk]

http://outgassing.nasa.gov/

 

[israelkk]

Here is the search for silicon potting compounds.

http://outgassing.nasa.gov/cgi/uncgi/search/search.sh

 

[israelkk]

Here it is for silicone potting compound.

YOUR SEARCH CRITERIA
Material Name: SILICONE
Category: POTTING COMPOUNDS
96 records found:
-------------------------------------------------------------------------------------------------------------------
MATERIAL % % CURE CURE AT- % DATA APPLICATION MFR
TML CVCM TIME TEMP MOS WVR REF CODE
-------------------------------------------------------------------------------------------------------------------
ABLETHERM 7-2 FILLED SILICONE 0.29 0.10 4H 74 AIR 0.01 GSC13332 POTTING AAC
ABLETHERM 7-5 A/B AS 100GM/14 DROPS FILLED SILICONE 0.68 0.19 4H 74 AIR 0 GSC13326 POTTING AAC
ABLETHERM 7-5 A/B AS 100GM/7 DROPS FILLED SILICONE 0.51 0.28 24H 65 E-6 0.01 GSC12220 POTTING AAC
ABLETHERM 7-5 OXIDE FILLED SILICONE 0.31 0.14 8H 80 AIR 0 GSC12829 POTTING AAC
CASTALL CX2303B CLEAR SILICONE 1.61 0.57 0 GSC12934 POTTING CAS
CASTALL S-1200HTC WHITE/SX-6761 SILICONE 0.66 0.23 7D 25 AIR 0 GSC21196 POTTING CAS
CASTALL S-1307 A/B AS 1/1 PBW RED SILICONE 0.58 0.28 24H 25 AIR 0.01 GSC18858 POTTING CAS
3H 140 AIR
CASTALL S1200HTC WHITE/SX-6761 SILICONE 0.64 0.29 2H 65 AIR 0.01 GSC21202 POTTING CAS
3H 100 AIR
3H 165 AIR
CASTALL S1382FR A/B AS 1/1 BW SILICONE 0.51 0.13 2H 100 AIR 0.02 GSC25576 POTTING CAS
CF 2500 A/B AS 10/1 BW CLEAR SILICONE 0.13 0.04 14D 25 AIR 0 GSC14088 POTTING MCG
CF 2500-1 A/B AS 10/1 BW CLEAR SILICONE 0.05 0.00 7D 25 AIR 0 GSC14130 POTTING MCG
CV-2289 CLEAR SILICONE 0.28 0.11 120H 100 E-2 0.03 GSC27202 POTTING MCG
CV-2289 CLEAR SILICONE 0.36 0.04 144H 80 E-2 0.03 GSC27205 POTTING MCG
CV-2289 CLEAR SILICONE 0.23 0.03 96H 80 E-5 0.03 GSC27220 POTTING MCG
CV-2289-1 A/B AS 1/1 BW SILICONE WHITE 0.30 0.01 0.05 GSC26893 POTTING MCG
CV-2289-1 A/B AS 1/1 BW SILICONE WHITE 0.20 0.01 25H 70 AIR 0.15 GSC26896 POTTING MCG
CV-2500 A/B AS 10/1 BW CLEAR SILICONE 0.12 0.02 7D 25 AIR 0 GSC15344 POTTING MCG
CV-2500 A/B AS 10/1 BW CLEAR SILICONE LOT 1646 0.05 0.02 30M 150 AIR 0 GSC16748 POTTING MCG
CV-2944 A/B AS 10/1 BW WHITE THERM COND SILICONE 0.58 0.04 7D 25 AIR 0.1 GSC15696 THERMAL POTTING MCG
CV-2945 A/B AS 10/1 BW WHITE THERM COND SILICONE 0.95 0.20 7D 25 AIR 0 GSC15699 THERMAL POTTING MCG
CV-2945 A/B AS 15/1 BW WHITE THERM COND SILICONE 0.19 0.03 7D 25 AIR 0.01 GSC16133 THERMAL POTTING MCG
CV-2946 A/B AS 15/1 BW WHITE THERM COND SILICONE 0.07 0.01 7D 25 AIR 0.02 GSC16226 THERMAL POTTING MCG
DC 93-500 A/B AS 10/1 BW SILICONE 0.20 0.02 7D 25 AIR 0.01 GSC10158 POTTING-ENCAPS DCC
DC 93-500 A/B AS 10/1 BW SILICONE 0.16 0.00 7D 25 AIR GSFC0371 POTTING-ENCAPS DCC
DC 93-500 A/B AS 10/1 BW SILICONE 0.29 0.00 24H 25 AIR GSFC0400 POTTING-ENCAPS DCC
DC 93-500 A/B AS 10/1 BW SILICONE LOT E2134-16 0.12 0.00 7D 25 AIR GSFC5421 POTTING-ENCAPS DCC
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.27 0.21 36H 52 AIR GSFC0308 POTTING MMM
72H 25 AIR
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 0.80 0.10 14D 25 AIR GSFC0332 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.07 0.26 3H 52 AIR GSFC0634 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.00 0.23 GSFC0643 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.79 0.19 24H 25 AIR GSFC0713 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.02 0.19 7D 25 AIR GSFC4192 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 0.94 0.22 30D 25 AIR GSFC4340 POTTING MMM
EC 1663 A/B AS 1/10 BW SILICONE SEALANT 1.06 0.20 30D 25 AIR GSFC4366 POTTING MMM
ECCOSIL 4850/CAT 25 AS 100/0.5 BW SILICONE 1.28 0.35 16H 25 AIR GSFC1606 POTTING EMC
ECCOSIL 4850/CAT 25 AS 100/0.5 BW SILICONE 1.21 0.34 2H 66 AIR GSFC1609 POTTING EMC
1H 121 AIR
ECCOSIL 4850/CAT 25 AS 100/0.5 BW SILICONE 1.04 0.25 2H 66 AIR GSFC1639 POTTING EMC
1H 121 AIR
ECCOSIL 4954/CAT 50 AS 10/0.01 BW FILLED SILICONE/F 0.34 0.11 14D 25 AIR 0 GSC14271 POTTING EMC
EGE-303HK A/B AS 100/3.5 PBW BLACK SILICONE 0.45 0.13 2H 100 AIR 0.01 GSC21765 ENCAPSULANT IPN
EGE-303HK A/B AS 100/3.5 PBW BLACK SILICONE 0.27 0.13 2H 100 AIR 0 GSC21828 ENCAPSULANT IPN
16H 177 AIR
EGE-303HK LV A/B AS 100/3.5 PBW BLACK SILICONE 0.44 0.13 2H 100 AIR 0.01 GSC21768 ENCAPSULANT IPN
EGE-303HK LV A/B AS 100/3.5 PBW BLACK SILICONE 0.24 0.13 2H 100 AIR 0 GSC21831 ENCAPSULANT IPN
16H 177 AIR
EGE-XX-305HK AS 10/1 BW SILICONE 0.09 0.03 2H 125 AIR 0.02 GSC26716 ENCAPSULANT IPN
1D 175 AIR
EGE-XX-307HK AS 1/1 BW SILICONE 0.06 0.02 2H 125 AIR 0.03 GSC26719 ENCAPSULANT IPN
1D 175 AIR
EGE-XX-309HK AS 1/1 BW SILICONE 0.06 0.00 2H 125 AIR 0.03 GSC26722 ENCAPSULANT IPN
1D 175 AIR
ENDEVCO 3090A RED SILICONE RUBBER 0.36 0.08 24H 175 AIR 0.04 GSC16364 POTTING END
ER 2600 A/B AS 10/1 BW CLEAR SILICONE 1.07 0.47 7D 25 AIR 0 GSC13948 POTTING FOR
ER 2600 A/B AS 10/1 BW CLEAR SILICONE 1.01 0.47 7D 25 AIR 0 GSC14049 POTTING FOR
6H 60 AIR
2H 100 AIR
FLUOROSILICONE SEAL (BLUE) FROM CRISTEK CONNECTOR 2.23 0.58 0.02 GSC28990 CONNECTOR SEAL ZZZ
INSULCAST 13/CAT 98 RED SILICONE 0.81 0.27 0.02 GSC20184 POTTING PSL
INSULCAST S-27NA A/B AS 1/1 PBW GRAY SILICONE 0.76 0.22 16H 25 AIR 0.03 GSC20589 POTTING PSL
4H 82 AIR
PR 1930-2 A/B AS 10/1 BW SILICONE 1.02 0.27 14D 25 AIR GSFC3814 POTTING PRC
Q3-6567 A/B AS 1/1 BW BLACK SILICONE 0.95 0.41 24H 80 AIR 0.01 GSC13000 ENCAPSULANT DCC
R-2160 A/B AS 10/1 BW RED SILICONE 1.78 0.49 21H 60 AIR 0.07 GSC24822 POTTING MCG
R-2501 A/B AS 10/1 BW CLEAR SILICONE 0.22 0.11 4H 65 AIR 0 GSC12145 ADH-POTTING MCG
7D 25 AIR
R-2566 0.5% BW CAT RED CONT VOLATILITY SILICONE 2.11 0.62 7D 25 AIR 0.05 GSC12112 ADH-POTTING MCG
R-2566 0.5% BW CAT RED SILICONE LOT 274 0.34 0.05 7D 25 AIR 0.06 GSC12718 POTTING MCG

RTV 11/T-12 AS 0.6% T-12 WHITE SILICONE 0.67 0.25 40H 25 AIR 0.01 GSFC8966 POTTING GEC
72H 150 AIR
RTV 11/T-12 AS 100/2 BW SILICONE 1.08 0.37 24H 25 AIR GSFC4800 POTTING GEC
24H 130 AIR
RTV 11/T-12 AS 50/1 BW SILICONE 2.53 0.95 24H 25 AIR GSFC5121 ENCAPS-MOLDING GEC
24H 130 AIR
RTV 12 A/B AS 20/1 BW CLEAR BLUE SILICONE 1.37 0.58 3H 66 AIR 0.6 GSC13647 POTTING GEC
RTV 511/CAT 9811 AS 6.0% BW CAT GREEN SILICONE 3.59 0.64 30D 25 AIR 0.01 GSFC9380 POTTING GEC
RTV 511/T-12 AS 100/0.5 BW SILICONE 3.13 0.60 24H 25 AIR GSFC4204 POTTING GEC
RTV 566 0.1 BW CAT SILICONE 0.22 0.06 7D 25 AIR 0.02 GSC27457 POTTING GEC
RTV 566 0.1% BW CAT SILICONE LOT GJ 124 0.13 0.01 7D 25 AIR 0.03 GSC11063 POTTING GEC
RTV 566 0.2% BW CAT SILICONE 0.27 0.00 24H 25 AIR GSFC1351 POTTING-ADH GEC
RTV 566 0.2% BW CAT SILICONE 0.23 0.03 24H 25 AIR GSFC1681 POTTING-ADH GEC
RTV 566 0.5% BW CAT SILICONE 0.41 0.01 24H 25 AIR GSFC1372 POTTING-ADH GEC
RTV 567 0.3% BW CAT SILICONE 0.53 0.01 5D 25 AIR GSFC3718 POTTING-ADH GEC
RTV 567 0.3% BW CAT SILICONE 0.18 0.01 12D 25 AIR GSFC3736 POTTING-ADH GEC
RTV 567 0.5% BW CAT SILICONE 0.27 0.07 12D 25 AIR GSFC3738 POTTING-ADH GEC
RTV 615 A/B AS 10/1 BW CLEAR SILICONE 0.91 0.37 4H 65 AIR 0.01 GSFC8969 POTTING GEC
72H 150 AIR
RTV 615 SILICONE 1.82 0.83 GSFC0887 POTTING-ENCAPS GEC
RTV 616 A/B AS 10/1 BW BLACK SILICONE 1.41 0.66 1H 100 AIR 0.01 GSFC6757 POTTING GEC
RTV 619 A/B AS 10/1 BW SILICONE 1.30 0.50 24H 25 AIR GSFC3071 POTTING GEC
RTV 630 GRAY SILICONE FROM COMPONENT 0.42 0.23 250H 125 AIR 0.03 GSC13891 POTTING GEC
RTV 670 A/B AS 10/1 BW CLEAR SILICONE 1.42 0.70 10H 60 AIR 0.02 GSC12955 POTTING GEC
RTV 670 A/B AS 10/1 BW CLEAR SILICONE 1.37 0.65 7D 25 AIR 0 GSFC9263 POTTING GEC
RTV 670 A/B AS 10/1 BW CLEAR SILICONE 1.25 0.59 1H 125 AIR 0 GSFC9266 POTTING GEC
RTV-E ONE PART WHITE SILICONE 1.40 0.55 1H 75 AIR 0.03 GSC18973 POTTING DCC
1H 115 AIR
1H 150 AIR
RTVS 3-165 A/B AS 10/1 PBW LIGHT BLUE SILICONE 1.25 0.22 5H 66 AIR 0.01 GSC21139 POTTING PSL
RTVS 3-165 A/B AS 10/1 PBW LIGHT BLUE SILICONE 1.25 0.21 22H 25 AIR 0 GSC21169 POTTING PSL
3H 52 AIR
RTVS 3-165 A/B AS 10/1 PBW LT BLUE SILICONE PROCCURE 1.24 0.22 0.01 GSC21166 POTTING PSL
RTVS 3-165LO A/B AS 10/1 PBW LT BLUE SILICONE 0.91 0.20 17H 100 AIR 0 GSC21301 POTTING PSL
SILASTIC 736 ONE PART RED SILICONE 2.03 0.45 7D 25 AIR 0.01 GSC13532 ADHESIVE DCC
SILASTIC E A/B AS 10/1 BW WHITE SILICONE 2.08 0.71 7D 25 AIR 0.05 GSC10664 POTTING DCC
SILASTIC E A/B AS 10/1 BW WHITE SILICONE 2.37 0.66 16H 25 AIR 0.05 GSC25861 POTTING DCC
4H 75 AIR
SILASTIC E A/B AS 10/1 BW WHITE SILICONE DEVOL 100C 1.22 0.39 7D 25 AIR 0.04 GSC10667 POTTING GSC
SILASTIC J A/B AS 10/1 BW GREEN SILICONE 1.12 0.38 16H 25 AIR 0.05 GSC25858 POTTING DCC
4H 75 AIR
SILICONE WITH TITANIUM DIOXIDE POWDER,P/N 93-500 0.27 0.07 12H 80 AIR 0.01 GSC27967 POTTING COMPOUND DCC
SWS 934 ONE COMPONENT SILICONE WHITE 0.43 0.21 7D 25 AIR 0.01 GSC12370 POTTING SWS
SYLGARD 160 A/B AS 1/1 PBW GRAY SILICONE 0.84 0.21 1H 100 AIR 0 GSC21987 POTTING DCC
SYLGARD 187 A/B AS 10/1 BW SILICONE 1.25 0.44 4H 121 E-1 GSFC4334 MOLD CPND DCC
SYLGARD 567 A/B AS 1/1 PBW BLACK SILICONE 1.25 0.27 3H 85 AIR 0.01 GSC20351 POTTING DCC
SYLGARD 567 A/B AS 1/1 PBW GRAY SILICONE 1.02 0.44 2H 100 AIR 0 GSC21990 POTTING DCC
TSC 11 A/B AS 10/1 BW CLEAR SILICONE 1.33 0.56 30D 25 AIR 0 GSC13656 POTTING TSC
4H 66 AIR

 

[Heckler]

nigelt - This is one of the programs I worked while at LM Sunnyvale. A2100 satellite bus is one of the most configurable satellites of the day. Lucky for me I worked in the A2100 structures and mechanisms group and not solar arrays


EchoStar
EchoStar Communications has announced that it will be filing an insurance claim on its EchoStar IV satellite. While the satellite was successfully launched on May 8, 1998, the south solar array did not properly deploy. Lockheed Martin has determined that protective snubbers which protect the folded solar array during launch formed a kind of glue that prevented the array from deploying. The snubbers used in the EchoStar launch were from a new supplier. The resulting reduction in power has left the satellite unable to function at full capacity. An unrelated problem resulted in the loss of four primary transponders and two spares. Only 22 of 36 transponders are functional with further degradation down to 16 transponders expected. The claim of $219,250,000 was filed through J & H Marsh & McLennan. Echostar expects to use the insurance money with other funds to launch a new DBS satellite to the 119 degrees West longitude orbital slot and then move EchoStar I and II which currently reside at the orbital slot to other locations to serve as back-ups. EchoStar currently has four operational DBS satellites providing 300 digital video and audio services to 1.5 million DISH Network customers (LaunchSpace; SpaceNews).

http://www.frontierstatus.com/fs0114.shtml

Best Regards,

Heckler
Sr. Mechanical Engineer
SW2005 SP 5.0 & Pro/E 2001
Dell Precision 370
P4 3.6 GHz, 1GB RAM
XP Pro SP2.0
NVIDIA Quadro FX 1400
o
_`\(,_
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Never argue with an idiot. They'll bring you down to their level and beat you with experience every time.