A Common Gel Defect. Crazing,. Here seen along a length of the MuMetal. GE 6156 has been the baseline gel since Amanda. Not sold as an optical Gel Color is uncontrolled Processing controversial ~$50.00/DOM Dow Corning Q3-6575 is being considered as an alternate.
Here seen along
a length of the MuMetal
Not sold as an optical Gel
Color is uncontrolled
Dow Corning Q3-6575 is being consideredas an alternate.
Unmixed samples have all been water clear.
Dow Corning processes their electronic grade silicones differently to decrease the level of volatile materials. Observed out-gassing behavior is much less active.
~$30.00 to $40.00/DOM Depending on packaging.RTV Gels
Greater than 10% transmission at 300 nm
50% transmission at lambda <= 325 nm
85% or better transmission at 350 nm
Must not scintillate or fluoresce (300nm < lambda < 600nm).
Must tolerate temperatures from –70C to 45C with no more than 2% loss of room temperature transmission.Perhaps two GEL types, one for IceTop, one for In-Ice?Requirements
3 Crazing Improved
13 New Crazing Appeared, (Minor)
FAT #2 Data Collected and unavailableVisual Inspection
Five DOMs in FAT 2
Three Degass methods: Mix A&B degass 20 minuets.
75 torr Bubbles, 25 torr Perfect, 7.5 torr Perfect.
Q3-6646 Highly purified version of Q3-6575
One DOM in FAT 3, No Data Yet
Q3-4154 Less Pt catalyst for clarity. (-45C)
Q3-6679 Fluorogel Good to -70C, (expensive)
OtherDow Corning Gels to Consider
Quality perception low
Unwilling to provide information
Provides 100% Raw Material for GELs Worldwide.
Responsive with samples, and technical assistance.
Willing to “tweak” standard GELs, or Develop New.
Distributor authorized to repackage.
Prices lower or competitive.GE verses Dow Corning