Negative Thermal Expansion.
Positive Results. ALLVAR Alloys.

ALLVAR Alloy M

+8 to -30 ppm/°C

Custom Coefficient of Thermal Expansion Alloys

Purpose Made for your application.

Choose your own CTE

Negative Thermal Expansion. Positive Results.

ALLVAR Alloys compensate for the thermal expansion of other materials.
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Tuneable CTE

Want zero CTE? No problem. Tune CTE for your design with ALLVAR Alloy's ultra-stable struts.
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Reduce SWAP-C

Improve unreliable optical performance and bulky designs with ALLVAR Alloys NTE spacers for Optics.
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Tackle CTE Mistmatch

ALLVAR Constant Force Washers maintain preloads across temperature changes.
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Negative Thermal Expansion Products

ALLVAR manufactures negative and tailored thermal expansion products including ALLVAR Alloy 30 and Alloy M round bar and tube, constant preload washers, lens tubes, and custom components. Ready to tackle your toughest thermal challenges? Contact us today.

Constant Force Washers and Spacers

Harness the power of negative thermal expansion with ALLVAR Alloy washers and spacers. The washers and spacers combat other materials’ thermal displacement to keep preloads constant.

  • Maintain Constant Preload
  • Negative CTE combats thermal mismatch
  • Athermalizes bolted joints
  • Great for cryo applications
  • Available in COTS and custom sizes

ALLVAR Alloy M - Purpose Matched Thermal Expansion

ALLVAR Alloy M gives you never design freedom you have never had before!

  • Tailored Thermal Expansion lets you decide what thermal expansion is best for your design.
  • Instantaneous CTE at 25°C ranges from +8 ppm/°C to -30 ppm/°C
  • Non-magnetic
  • Works well in cryogenic environments.

ALLVAR Alloy 30 Negative Thermal Expansion Custom Components and Material

ALLVAR Alloy 30  componsents can be custom-made for your application. Contact us early in the design cycle to learn how negative CTE will athermalize your design.

  • Negative Thermal Expansion -30ppm/°C at 25°C
  • Non-magnetic
  • Titanium-based
  • Custom Alloy 30 Components
  • Round bar and Tube Available
  • Cryogenic to 100°C
Component CTE Mismatch
SWaP-C Challenges
Fastener Slip
Optical Tolerancing
CTE Control
Fastener Fatigue
Maintaining Performance at Temperature
Narrow Safety Margins
Fastener Loosening
Cryogenics
Reliability
Vibration

STAY IN THE LOOP ON NEGATIVE THERMAL EXPANSION

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Passive Athermalization made easy with Negative Thermal Expansion.

The process of removing thermal effects from a system is called athermalization. Creating an athermal design that actively athermalizes a system is challenging, and often increases the weight and complexity of a system. Passive athermalization achieves the same results as an active system, but without using powered systems or requiring outside feedback. It requires iterative changes and tweaks to hone the thermal changes of individual components in a design, so that they together work in unison to passively counteract thermal effects. These systems are challenging to design, manufacture, and test. ALLVAR Alloys makes this process much easier.

Tailored Thermal Expansion.

ALLVAR Alloys allow engineers and designers to target a specific thermal expansion for their system. Designers select a specific thermal expansion, from –30 ppm/°C to a joined materials positive coefficient of thermal expansion, and incorporate a calculated length of ALLVAR Alloy 30 to hone in on a target CTE. Being able to tailor a specific CTE flips the design paradigm on its head. 

Blog & News

Resources

Resources

Video Resources - Learn More About ALLVAR and Negative Thermal Expansion

Click the images below to get our selection of videos and learn more about our company, our technology and our products.

An image of a bench-top demonstrator that shows negative thermal expansion ALLVAR vs other spacers.

ALLVAR University

Watch our videos to learn more about negative CTE and how it can be precisely compensate positive CTE components in athermal assemblies.

Multiple Titanium Alloy bars and tubes interspaced with an ALLVAR logo situated between them.

Demonstration Videos

Our demonstration videos show how important a washer can be, and how a simple change in Optics can eliminate thermal focus shift.

ALLVAR Logo with a transparent background. The Logo has a stylized "AV" with warm yellows and oranges on the left into a cooler blues in the V to represent negative thermal expansion.

Meet Our Team

Meet our team, from our founder to our engineers, and hear their perspective on their new negative CTE alloys.

Multiple Titanium Alloy bars and tubes interspaced with an ALLVAR logo situated between them.

Watch a Webinar

Interested in a longer lesson on negative CTE and ALLVAR Alloys? Watch our webinar to get the details.

ALLVAR SPIE Defense + Commercial Sensing Banner Ad - Come see us at booth 518.. Negative Thermal Expansion Positive Results

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