Can a substance of Category A with a concentration 5% lower be considered as Category C?

When the revised 2015 version of the \"Catalogue of Hazardous Chemicals\" was released, Document No. Guan San [2015] 80 issued by the General Administration of Work Safety contained clear provisions regarding its implementation. Article 6 states that for mixtures whose main components are all hazardous chemicals listed in the Catalogue, and whose combined mass ratio or volume ratio of these components is less than 70%, or for chemicals whose hazardous properties have not yet been determined, the manufacturing or importing enterprises shall carry out assessments and classifications in accordance with the \"Measures for the Assessment and Classification of the Physical Hazards of Chemicals\" (Order No. 60 of the General Administration of Work Safety) and other relevant regulations. If, as a result of such assessments and classifications, it is determined that these substances are hazardous chemicals, then they must be registered in accordance with the \"Measures for the Registration of Hazardous Chemicals\" (Order No. 53 of the General Administration of Work Safety); however, no relevant safety licensing procedures are required. It is recommended to use an authoritative institution to conduct identification and classification of the mixture in order to determine the classification method. In recent years, it has become quite common to carry out property assessments on mixtures; the costs involved are low, which facilitates qualitative assessment in the preparation of designs.

There is a simple method: Class A substances are clearly specified in the Code for Fire Protection Design of Buildings, and you can calculate it by using the flash point of the mixture. For example, an alcoholic solution with a temperature of 38° is generally classified as Category A, as its flash point falls within the range for Category A. As for other substances, you can do the calculations; calculating the flash point of a binary mixture is very simple, with just one formula. It is best to use ASPEN for simulation calculations in the case of multiphase systems.

This is an excellent idea. Thank you.

The flash point of the mixture is calculated theoretically; it’s not clear whether this value can be accepted. But it’s a good idea.

It is possible, because that’s how alcohol production facilities are classified.

May I ask what is the formula for calculating the flash point of a binary mixture? ?