Products with hazardous substances hold hazard symbols and other warnings on their labels. They show you what dangers might occur when you use the product incorrectly. This enables carriers and users know which risks the products carry. A substance can be irritating or corrosive, harmful to people and the environment, flammable or explosive. Some symbols can occur in combination with each other on the same product.
What is "hazard symbol free"?
Danger symbol free means that the product in question does not require any indication of danger, via a symbol, and therefore no hazard symbol or label is required. Furthermore the product must be entirely safe for people and the environment.