Asphalt content ignition furnaces determine the asphalt content of paving mixtures and other asphalt-based materials. The basic principle of an asphalt content/binder ignition furnace is to apply heat to the sample in a controlled environment, which causes the asphalt to burn off in as little as 20-45 minutes, depending on the furnace and sample size.

For example, the Troxler ICO NCAT Oven offers a burn time of 20 minutes or less for a 1200gr sample, while the Thermolyne NCAT Asphalt Content Furnace by ThermoFisher offers a burn time of 30 - 40 min for the same sample size. Learn the differences between two of the most popular Asphalt Ignition Ovens available on the market in this blog.

The furnace is equipped with a balance to measure the weight of the sample before and after heating, which allows the operator to calculate the percentage of asphalt in the sample. In addition to asphalt content testing, these furnaces can also be used for a variety of other applications, such as determining the ignition point of various materials, testing the ash content of coal, and conducting elemental analysis.

There are several types of asphalt content binder ignition furnaces available on the market today, with different features and capabilities. Some of the most common types include:

Benchtop Furnaces - These are compact and portable furnaces that can be easily transported to different locations. They are typically used for smaller samples and are popular among contractors and testing labs.

Floor Standing Furnaces - These are larger furnaces that are designed for high-volume testing. They are typically used in industrial applications, such as asphalt production plants, and can handle larger samples.

Muffle Furnaces - These are specialized furnaces that use a muffle to separate the sample from the flame. The muffle protects the sample from direct contact with the flame and prevents contamination, making it ideal for more sensitive materials.

When selecting an asphalt content ignition furnace, keep in mind the following factors:

1. The size and type of sample: One of the most important factors to consider when selecting an ignition furnace for asphalt content/binder testing is the size and type of the sample you'll be testing. You need to ensure that the furnace is large enough to accommodate the sample size you'll be working with. Additionally, you should consider the type of sample, whether it's a loose powder, pellet, or solid block.

2. The temperature range: The temperature range is another important factor to consider. Asphalt content/binder ignition furnaces typically operate at high temperatures (up to 1100°C). However, the furnace you select should have the appropriate temperature range for your specific testing requirements. Additionally, a key characteristic is to ensure that the furnace is capable of reaching the required temperature quickly and maintaining it consistently.

3. Control features of the furnace: Look for a furnace that has precise temperature control, with the ability to program and store multiple temperature profiles. Also, a furnace with safety features such as over-temperature protection, alarm systems, and automatic shut-off can be beneficial in preventing accidents and ensuring safe operation.