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title: FAQs About Common K Value (Thermal Conductivity) Applications
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 Sep 15, 2025 9:19:15 AM

# FAQs About Common K Value (Thermal Conductivity) Applications

[Mark Rhoa, Jr.](https://hub.chizbros.com/insights/author/mark-rhoa-jr)

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Engineers and purchasing professionals often need reliable thermal conductivity (K value) data for correct material selection, long-term performance, and cost efficiency. Below are answers to some of the most common questions we receive about Alkegen (formerly Unifrax) products.

#### **Q: K values on the Alkegen Heat Flow Program are listed only to 1600°F. How do I use this information if my application is above 1600°F?**

**A:** K values in the Heat Flow Program are based on *mean temperature*, not hot face temperature. Temperature drop across a furnace lining is not uniform, and K values vary with temperature.

To calculate mean temperature:

![K Value - Mean Temp](https://hub.chizbros.com/hs-fs/hubfs/K%20Value%20-%20Mean%20Temp.png?width=785&height=157&name=K%20Value%20-%20Mean%20Temp.png)

Example:

- Hot Face = 2000°F
- Ambient = 100°F
- Mean = (2000 + 100)/2 = **1050°F**

Because a mean temperature above 1600°F would require hot face conditions beyond 3000°F, K values above 1600°F are not applicable for ceramic fiber insulation.

#### **Q: What is the R Value of Durablanket?**

**A:** R Value is most often used in commercial/low-temperature insulation:

- At **<500°F**: Conduction dominates heat transfer. Lower-density products yield better R values.
- At **>1000°F**: Radiation dominates. Higher-density products block radiant heat more effectively.

Formula:

![R Value Durablanket](https://hub.chizbros.com/hs-fs/hubfs/R%20Value%20Durablanket.png?width=785&height=157&name=R%20Value%20Durablanket.png)

**Note:** Always use the K value corresponding to the mean temperature of your application. While R value can be calculated, it is not a reliable performance measure above 1000°F.

#### **Q: Is there an equation to calculate K values at specific temperatures?**

**A:** Yes. The quadratic curve-fit equation allows you to calculate K at a desired mean temperature (T):

![K Value - Temp](https://hub.chizbros.com/hs-fs/hubfs/K%20Value%20-%20Temp.png?width=1000&height=200&name=K%20Value%20-%20Temp.png)

Where A, B, and C are constants (specific to each material) available in the Alkegen Heat Flow Program. These values are derived from regression analysis of multiple data sets.

**Example with Durablanket S, 8 pcf at 1000°F mean temp:**

- A = 0.361178571429
- B = 0.000069107143
- C = 0.000000684821

K = 0.361178571429 + (0.000069107143 × 1000) + (0.000000684821 × 10002)

K = 0.9770K = 0.9770K=0.9770

Accurate K values are critical for selecting the right insulation and avoiding costly system inefficiencies.

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