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silicone outgassing 101 required, please!

silicone outgassing 101 required, please!

silicone outgassing 101 required, please!

(OP)
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!

RE: silicone outgassing 101 required, please!

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.

RE: silicone outgassing 101 required, please!

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

RE: silicone outgassing 101 required, please!

nigelt-
The outgassing creates undesireable films on optical components.

Tunalover

RE: silicone outgassing 101 required, please!

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

RE: silicone outgassing 101 required, please!

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
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