Generally speaking, environmentally friendly coatings mainly consider two important aspects: odor and VOCs.

• Odor: First determine the source and testing method of the odor.
• VOCs: Determine the main source of VOCs.

Classification of paint odor

• In-can odor

This is mainly the odor when opening the packaging bucket.

• Odor persistence

This mainly refers to the odor after construction on the substrate, especially the odor formed indoors.

The odor of paint is somewhat different from our usual understanding. The in-can odor of paint and its odor on the substrate reflect two different phenomena.

Paint odor detection methods

• In-can odor test

1. Each test is conducted by a test group of 5-10 people.
2. Samples are rated from 1-10, with larger numbers indicating a stronger odor.
3. Testers first smell the standard sample (refer to commercially available low-odor paints) and give the odor intensity level according to the reference sample.

• Paint film odor persistence test

1. Place painted sample panels in five sealed small cabinets.
2. The test is conducted by a test group of 5-10 people.
3. The testing method is the same as the in-can odor testing method.

• In order to develop low-odor or odorless products, odor testing instruments can also be used!