Aerospace & Defense Technology - December 2023 - 21

Test & Measurement
Lehnen Industrial Services
https://lehnendesign.com/
operational lifetime of hardware and, at
worst, trigger mission failure.
However, silicone manufacturers
can formulate highly purified, low
outgassing silicones that aerospace
manufacturers can use to avoid contamination
and prevent material degradation.
Formulating
Low Volatility Silicones
for Space
Silicone manufacturers have a variety
of tools at their disposal to create
specialized materials. Starting with
the polymer, having control over the
molecular weight, purity and functionality
allows the silicone to be tailored to
achieve the material properties needed
for the end application (cure chemistry,
kinetics and rheology) as well as
performance qualities (elasticity, thermal
stability, volatility, optical clarity,
etc.). Addition of fillers can help determine
a final material's rheological and
mechanical properties, such as flow,
hardness, strength and other characteristics.
In addition, specialty fillers can
be added to enhance thermal or electrical
conductivity, increase thermal stability
or reduce weight.
Whether the application requires a
next-generation silicone film adhesive
for advanced assembly or an electrically
conductive silicone to protect vital
components, when formulating spacegrade
silicones it is imperative to minimize
the volatiles that might outgas.
Formulating with the right materials
will ensure the final silicone material
meets the low volatility requirements
and the application-specific performance
characteristics.
Evaluating Space-Grade Silicones
It is essential to consider material
requirements early in the design process
by evaluating a range of different factors,
including the following. Function: The
first consideration is what the material
is intended to do. Space applications
might require any one of a wide range of
functions, including:
* Adhesives (either in liquid or tape form)
to bond components to substrates, like
metals, plastics, glass and more
* Thermally or electrically conductive
materials to transfer heat from elecAerospace
& Defense Technology, December 2023
tronic devices or form conductive
bonds
* Coatings to protect against atomic oxygen
and provide radiation or thermal
stress resistance
* Potting or encapsulating materials to
protect sensitive electronic components
from vibration, shock and exter1.1
0.8
0.9
1
0.7
0.6
0.5
0.4
0.3
0.2
0.1
Condensation
cure
ASTM E595 TML spec. ≤ 1.0%
nal contaminants like moisture and
debris
As part of function evaluation, it is
important to consider what materials
the silicone will be in contact with:
metals, polymers or composites. If
the selected silicone requires heat to
cure, that could negatively impact
Addition cure
Film adhesive/tape
NuSil®
ULO™
TML spec. ≤ 0.1%
% TML E595
% TML E1559
Figure 1: Comparison of the percentage of TML at the end of testing by ASTM E595 vs. E1559.
MATERIAL
SCV-2596
CV-2646
CV-1144-0
CV-1152
CV-1142
CV-2289-1
CV10-2568
SCV-2585
SCV-2586
CV16-2500
SCV1-2590
CV4-1161-5
CV-2680-12
CURE CHEMISTRY
Condensation
Condensation
Condensation
Condensation
Addition
Addition
Addition
Addition
Addition
Addition
Addition
Addition
N/A
DESCRIPTION
Adhesive
Coating
Coating
Electrically conductive
Electrically conductive
Adhesive
Adhesive
Adhesive
Adhesive
Adhesive
Adhesive
Film adhesive
PSA film adhesive
Figure 2: Cure chemistries and applications of the tested low outgassing and ultra-low outgassing silicones
for space applications.
mobilityengineeringtech.com
21
CV4-1161-5
CV-2680-12
SCV1-2590
SCV-2586
CV16-2500
CV10-2568
SCV-2585
CV-2289-1
SCV1-2596
CV-2646
CV-1144-0
CV-1152
CV-1142
% TML
https://www.lehnendesign.com/ http://mobilityengineeringtech.com

Aerospace & Defense Technology - December 2023

Table of Contents for the Digital Edition of Aerospace & Defense Technology - December 2023

Aerospace & Defense Technology - December 2023 - Intro
Aerospace & Defense Technology - December 2023 - Sponsor
Aerospace & Defense Technology - December 2023 - Cover1
Aerospace & Defense Technology - December 2023 - Cover2
Aerospace & Defense Technology - December 2023 - 1
Aerospace & Defense Technology - December 2023 - 2
Aerospace & Defense Technology - December 2023 - 3
Aerospace & Defense Technology - December 2023 - 4
Aerospace & Defense Technology - December 2023 - 5
Aerospace & Defense Technology - December 2023 - 6
Aerospace & Defense Technology - December 2023 - 7
Aerospace & Defense Technology - December 2023 - 8
Aerospace & Defense Technology - December 2023 - 9
Aerospace & Defense Technology - December 2023 - 10
Aerospace & Defense Technology - December 2023 - 11
Aerospace & Defense Technology - December 2023 - 12
Aerospace & Defense Technology - December 2023 - 13
Aerospace & Defense Technology - December 2023 - 14
Aerospace & Defense Technology - December 2023 - 15
Aerospace & Defense Technology - December 2023 - 16
Aerospace & Defense Technology - December 2023 - 17
Aerospace & Defense Technology - December 2023 - 18
Aerospace & Defense Technology - December 2023 - 19
Aerospace & Defense Technology - December 2023 - 20
Aerospace & Defense Technology - December 2023 - 21
Aerospace & Defense Technology - December 2023 - 22
Aerospace & Defense Technology - December 2023 - 23
Aerospace & Defense Technology - December 2023 - 24
Aerospace & Defense Technology - December 2023 - 25
Aerospace & Defense Technology - December 2023 - 26
Aerospace & Defense Technology - December 2023 - 27
Aerospace & Defense Technology - December 2023 - 28
Aerospace & Defense Technology - December 2023 - 29
Aerospace & Defense Technology - December 2023 - 30
Aerospace & Defense Technology - December 2023 - 31
Aerospace & Defense Technology - December 2023 - 32
Aerospace & Defense Technology - December 2023 - 33
Aerospace & Defense Technology - December 2023 - 34
Aerospace & Defense Technology - December 2023 - 35
Aerospace & Defense Technology - December 2023 - 36
Aerospace & Defense Technology - December 2023 - 37
Aerospace & Defense Technology - December 2023 - 38
Aerospace & Defense Technology - December 2023 - 39
Aerospace & Defense Technology - December 2023 - 40
Aerospace & Defense Technology - December 2023 - Cover3
Aerospace & Defense Technology - December 2023 - Cover4
https://www.nxtbook.com/smg/techbriefs/24ADT04
https://www.nxtbook.com/smg/techbriefs/24ADT02
https://www.nxtbook.com/smg/techbriefs/23ADT12
https://www.nxtbook.com/smg/techbriefs/23ADT10
https://www.nxtbook.com/smg/techbriefs/23ADT09
https://www.nxtbook.com/smg/techbriefs/23ADT08
https://www.nxtbook.com/smg/techbriefs/23ADT06
https://www.nxtbook.com/smg/techbriefs/23ADT05
https://www.nxtbook.com/smg/techbriefs/23ADT04
https://www.nxtbook.com/smg/techbriefs/23ADT02
https://www.nxtbook.com/smg/techbriefs/22ADT12
https://www.nxtbook.com/smg/techbriefs/22ADT10
https://www.nxtbook.com/smg/techbriefs/22ADT09
https://www.nxtbook.com/smg/techbriefs/22ADT08
https://www.nxtbook.com/smg/techbriefs/22ADT06
https://www.nxtbook.com/smg/techbriefs/22ADT05
https://www.nxtbook.com/smg/techbriefs/22ADT04
https://www.nxtbook.com/smg/techbriefs/22ADT02
https://www.nxtbook.com/smg/techbriefs/21ADT12
https://www.nxtbook.com/smg/techbriefs/21ADT10
https://www.nxtbook.com/smg/techbriefs/21ADT09
https://www.nxtbook.com/smg/techbriefs/21ADT08
https://www.nxtbook.com/smg/techbriefs/21ADT06
https://www.nxtbook.com/smg/techbriefs/21ADT05
https://www.nxtbook.com/smg/techbriefs/21ADT04
https://www.nxtbook.com/smg/techbriefs/21ADT02
https://www.nxtbookmedia.com