As the product technology in the tunnel construction industry becomes more stable and mature, environmental protection issues have gradually been mentioned in some parts of China. Recently, more and more tunnel construction units in cities have consulted about the environmental risks and toxicity standards of tunnel sealing grease and various types of soil improvement products.

Tunnel sealing grease and soil improvement additives, as a category of chemical products, can usually be referenced to the GHS labeling system (Globally Harmonized System of Classification and Labelling of Chemicals). Part four of the system's environmental hazard section includes harm to aquatic environments and harm to the ozone layer, which are also used as basic environmental indicators for measuring products. The main factors for harm to aquatic environments are (a) acute aquatic toxicity, (b) chronic aquatic toxicity, (c) possible or actual accumulation in organisms, and (d) degradation of organic compounds (biotic or abiotic).

To facilitate the rapid classification of environmental hazards, aquatic hazards are usually classified by testing fish, crustaceans (arthropods), algae, or other aquatic plants, and commonly used testing methods are as follows:

We will take acute toxicity to fish as an example. This test divides products into three categories, and each category defines the environmental hazard, with the corresponding results and hazard definitions as follows:

Other content can refer to the detailed explanation of part four of the GHS, which is not listed here one by one. The following methods are commonly used for testing the degradation of organic compounds:

The chemical safety technical instructions (Material Safety Data Sheet) for chemical products usually also contain information on the above hazards.

The above test standards are all OECD guidelines, and there are usually corresponding GB/T national standards testing methods, so they are also applicable to the domestic market. If customers have any questions about aquatic hazards and biodegradation, feel free to consult.