Thermal Conductivity & Thermal Diffusivity Testing Services

Which service fits your sample

Each service is built around one sample geometry. The requirements below are the standard ones; a specimen outside them is worth describing before you ship it.

• Free-standing wires, fibers and films, micrometer thick — transient electro-thermal technique (TET)
  Thermal conductivity, thermal diffusivity and specific heat. Sample: ~µm thick, 5 mm long, 3 specimens. Room temperature, room temperature to 10 K or −20 °C to 70 °C. Typical lead time 1–2 weeks (longer for the 10 K run). Service details and online order
• Free-standing wires, fibers and films, sub-micrometer thick — transient electro-thermal technique (TET)
  Thermal conductivity, thermal diffusivity and specific heat. Sample: sub-µm thick, ~1 mm long, 3 specimens. Room temperature or room temperature to 10 K. Typical lead time 1–3 weeks (longer for the 10 K run). Service details and online order
• 2D materials, suspended or supported — Raman thermometry
  Thermal conductivity and interface thermal resistance. Sample: tens of nm to sub-nm thick, >6 µm across if suspended, >3 µm if supported, 2 specimens. Room temperature or room temperature to 77 K. Typical lead time 2–4 weeks (longer for the 77 K run). Service details and online order
• Coatings — photothermal measurement
  Thermal conductivity and interface thermal resistance. Sample: ~mm to sub-µm thick, >3 mm across, 1 specimen. Room temperature. Typical lead time 1 week. Service details and online order
• Bulk materials — photothermal measurement
  Thermal conductivity. Under vacuum: 5 through-thickness and 2 in-plane measurements. Sample: ~tens of µm to tens of cm thick, >2 mm across, 1 specimen. Room temperature. Typical lead time 1 week. Service details and online order

Lead times are for reference and vary from sample to sample; the 10 K and 77 K runs take longer. Samples are non-returnable.

How to get a quote

1. Send us the material, its form and dimensions, the property and temperature you need, and how many specimens you can send, with a photo if you have one.
2. We reply with the matching service and a quote.
3. Ship the specimens; results come back as a written report.

Standard tests can also be ordered online from each service page: choose the temperature option, add it to the cart, and check out or request a quote from the cart.

How the three methods work

Transient electro-thermal technique (TET). The specimen hangs between two electrodes in vacuum and a step current heats it; the voltage across it traces its temperature rise, which gives the thermal diffusivity and thermal conductivity, and with the density the specific heat.

Photothermal measurement. A modulated laser heats a thin gold film on the sample surface and the thermal radiation from the heated spot is recorded; how far that signal lags the modulation gives the thermal conductivity and, for a coating, the thermal resistance at its interface.

Raman thermometry. A focused laser heats a 2D layer and reads its temperature from the Raman peak shift; the temperature rise per absorbed power gives the in-plane thermal conductivity of a suspended layer and the thermal resistance to the substrate of a supported one.

Thermal measurement guides

• Thermal Conductivity Testing & Diffusivity Guide — TET, laser flash, 3ω, TDTR and Raman compared by sample geometry, direction and temperature.
• Which Thermal Measurement Method? — choose by sample form, support state, direction, scale, electrical behavior and temperature.
• Thermal Conductivity Test Methods by Sample Type — how each method works and what it determines directly.
• Thermal Testing Sample Preparation Guide — geometry windows, surface finish, coatings, mounting and conditioning.
• How to Read a Thermal Test Report — what a defensible report contains and how to audit its uncertainty budget.
• Transient Electro-Thermal (TET) Technique Guide — setup, governing solution and signal analysis for wires, fibers and films.

Need a quote? Email contact@acsmaterial.com, use the contact form, or call +1 (866) 227-0656. Tell us the material, its form and dimensions, and what you need measured.