LOI (Loss on Ignition) measurement is a common method used to determine the amount of volatile materials, such as moisture, organic matter, and volatile inorganic compounds, present in a sample. The measurement is typically expressed as a percentage of weight loss upon heating the sample to high temperatures.

When it comes to LOI measurement methods, there are two well-known standards: ASTM (American Society for Testing and Materials) and ISO (International Organization for Standardization). Both standards provide guidelines for conducting LOI measurements, but there are some differences to be aware of.

1. ASTM Standards:

ASTM has several standards related to LOI measurements, including ASTM D3175, ASTM D2866, and ASTM E114. These standards outline specific procedures and equipment requirements for determining LOI in various materials, such as plastics, rubber, textiles, and building materials.

2. ISO Standards:

ISO also has standards related to LOI measurements, such as ISO 3451-1 and ISO 1833-5. These standards provide guidelines on the determination of organic matter content and moisture content, respectively, in different types of materials.

Comparing ASTM and ISO standards for LOI measurements, there are a few key points to consider:

- Equipment and procedures: Both standards have their own specific requirements for equipment and testing procedures. It is crucial to follow the guidelines outlined in the respective standard to ensure accurate and consistent LOI measurements.

- Sample preparation: ASTM and ISO standards may differ in sample preparation methods, including sample size, sample conditioning, and pre-testing treatments. These differences may influence the LOI measurement results.

- Reporting and calculation: The standards may have variations in how LOI results are reported and calculated. It is important to understand the specific requirements outlined in the standard being used to ensure proper reporting.

To determine the most appropriate standard for LOI measurement, it is essential to consider the specific industry or material being tested, as well as the regulatory requirements or specifications that apply. Consulting the relevant ASTM or ISO standards and guidelines is highly recommended to ensure accurate and consistent LOI measurements.