Negative Thermal Expansion.
Positive Results. ALLVAR Alloys.
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
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Component CTE Mismatch |
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SWaP-C Challenges |
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Fastener Slip |
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Optical Tolerancing |
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CTE Control |
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Fastener Fatigue |
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Maintaining Performance at Temperature |
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Narrow Safety Margins |
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Fastener Loosening |
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Cryogenics |
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Reliability |
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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
Invar vs. ALLVAR Washers: Save Weight & Maintain Preload
Invar and ALLVAR Washers and Spacers: Benefits and Differences Invar washers have long been the go-to solution for thermally stable joints in precision instruments, aerospace,
ALLVAR Gets Ready for Aerospace: Material testing for confidence
ALLVAR Alloy 30 Design Allowable Properties are here! From analysis to manufacturing high quality products, engineers need accurate material property data. As a material supplier,
Carbon Fiber Reinforced Polymers (CFRP) vs ALLVAR: Near Zero Thermal Expansion Materials
Carbon Fiber Bar and Tube vs ALLVAR Alloys Bar and Tube In the realm of advanced materials for precision structures, carbon fiber reinforced polymers like
A Milestone Year for ALLVAR: 2024 YEAR-IN-REVIEW
A Message from James A. Monroe, Founder & CEO 2024 marks ALLVAR’s ten-year anniversary and my goodness have we come a long way. Since
Athermalizing Mounted Doublets with ALLVAR Alloys: Unlocking New Possibilities in Athermal Optics
Increasing your options on the athermal glass map. As a ray tracer, what potential athermal designs could you unlock if optical your glass choices were
Tips for Designing with ALLVAR Alloys: Simplified Thermal Design
Want to learn more about how ALLVAR alloys can help with your thermal design? Find these tips, tricks, and rules of thumb to start designing with Negative CTE Alloys today.
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.
ALLVAR University
Watch our videos to learn more about negative CTE and how it can be precisely compensate positive CTE components in athermal assemblies.
Demonstration Videos
Our demonstration videos show how important a washer can be, and how a simple change in Optics can eliminate thermal focus shift.
Meet Our Team
Meet our team, from our founder to our engineers, and hear their perspective on their new negative CTE alloys.
Watch a Webinar
Interested in a longer lesson on negative CTE and ALLVAR Alloys? Watch our webinar to get the details.
