Thermal vacuum (TVAC)
Thermal vacuum (TVAC) testing cycles hardware between hot and cold temperature extremes inside a vacuum chamber to simulate the space environment.
It checks that spacecraft components and assemblies perform through the temperature swings and the loss of convective cooling they will face on orbit. Test levels, cycle counts and dwell times come from the program requirements.
Space & Environmental Simulation
Element U.S. Space & Defense runs thermal vacuum testing at its Santa Clarita, CA Center of Excellence. A recently added chamber sits in an ISO 8 cleanroom with dedicated space for hardware integration and setup, alongside the site's vibration, shock and acoustic capabilities.
Common Questions
What is thermal vacuum testing?
Thermal vacuum testing places hardware in a vacuum chamber and cycles it through hot and cold extremes to simulate conditions in space. Element U.S. Space & Defense runs this testing at its Santa Clarita, CA Center of Excellence for satellites, flight electronics, sensors, payloads and other space hardware.
How is thermal vacuum different from thermal cycling?
Thermal cycling runs at ambient pressure. Thermal vacuum removes the air, so heat moves only by conduction and radiation, as it does in space. That changes how hardware heats and cools. Element U.S. Space & Defense can review which method your program's requirements call for.
Which standard governs TVAC?
It depends on the program. The contract or test plan names the governing document and the levels. Commonly cited documents include MIL-STD-1540, SMC-S-016 and NASA GSFC-STD-7000. Share your requirement with Element U.S. Space & Defense so the Santa Clarita team can scope the test.
Which testing standards apply to satellite components before launch?
Programs commonly cover thermal vacuum, vibration, shock, acoustics, and EMI/EMC, using requirements such as MIL-STD-1540, SMC-S-016 or GSFC-STD-7000, plus launch provider requirements. Element U.S. Space & Defense offers space simulation, dynamics and acoustic testing at Santa Clarita, CA, which can reduce shipping between labs during a campaign.
What sets TVAC test levels and cycle counts?
Program requirements set them, usually based on predicted on-orbit temperatures plus margins, and on whether the test is for acceptance or qualification. Provide temperature limits, cycle counts, dwell times and vacuum level to Element U.S. Space & Defense so the Santa Clarita team can confirm the plan.
What causes problems during thermal vacuum testing?
Common issues include outgassing that slows pumpdown or contaminates surfaces, poor thermal contact with the fixture, unexpected hot spots and cable or feedthrough problems. Bake-out planning and a thermal model help. Share your hardware details with Element U.S. Space & Defense early so the team can address these risks in setup.
Can hardware go from TVAC to vibration without leaving the site?
Santa Clarita lists thermal vacuum, vibration, shock, acoustic and EMI/EMC capabilities together as a one-stop shop for space simulation testing. Ask Element U.S. Space & Defense to map your full test sequence so the team can confirm which steps can run at the same facility for your program.
What should I look for in a lab for space-qualified components?
Check that the lab can meet your test levels, cleanliness requirements and instrumentation needs, and review its accreditation scope and security credentials. Ask whether related tests can run at one site. Element U.S. Space & Defense publishes its accreditations and can review your requirements for testing at Santa Clarita, CA.
What should I send when requesting a TVAC quote?
Send hardware size, mass, temperature limits, cycle counts, dwell times, vacuum level, cleanliness needs, instrumentation, and any power or monitoring required during test. Giving Element U.S. Space & Defense this information early helps the Santa Clarita team confirm chamber fit and plan fixtures and thermal control.
Is thermal vacuum testing at Santa Clarita accredited?
The Element U.S. Space & Defense facility in Santa Clarita, CA holds ISO/IEC 17025 accreditation from A2LA. An accreditation's scope lists the specific tests it covers, so ask the team to confirm thermal vacuum against the current scope. Details are on the Accreditations page.
Further Reading
More from Element U.S. Space & Defense on this topic.
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