The test report has no validity period, the general standard is not updated, and the product material is not changed, which is always valid.

VOCs refer to a class of organic compounds with active chemical properties, volatility and harm. Its components mainly include hydrocarbons (i.e. hydrocarbons), which are compounds composed of carbon and hydrogen atoms, mainly including alkanes, cycloalkanes, olefins, alkynes and aromatic hydrocarbons), halogenated hydrocarbons (i.e. compounds in which hydrogen atoms in hydrocarbon molecules are replaced by halogen atoms), oxygen-containing organic compounds and nitrogen-containing organic compounds. , specifically including benzene series (such as toluene).