How to identify excessive formaldehyde in flooring: In the flooring industry, there are only two national standards—E1 and E2. For instance, the E1 standard using the desiccant method is ≤9mg/100g, while the drying chamber method sets a limit of ≤1.5mg/L, and the climate chamber method measures ≤0.12mg/m³.
The drying chamber method is the official test procedure used by national standards. This involves placing 10 randomly selected small pieces of flooring, each 5 cm wide and 15 cm tall, in a special 40-liter container under controlled temperature and humidity. At the bottom of the container is a dish with a specific amount of water. The formaldehyde released from the flooring is measured based on how much dissolves into the water over a set period of time.
Many companies now claim an E0 standard, which is often cited as 0.5 mg/L. However, this isn’t an official standard in the flooring industry.
According to Dr. Floor, the E0 label isn’t a recognized national standard for flooring. It was originally a trademark registered by a company from Henan province after identifying a business opportunity. Some flooring manufacturers now use it. The 0.5 mg/L value, as far as he knows, is actually based on Japanese standards—not the European international standard that some sellers might falsely claim.
It’s important to understand the difference between actual national standards and marketing claims. Always look for certifications and third-party testing when evaluating the safety of flooring products. This helps ensure you're making an informed decision about the quality and health impact of your home’s materials.
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