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A wide variety of particulate substances exist in our everyday life.

Some particulates are taken via breathing and absorbed into human body, resulting in health disorders.

Pneumoconiosis, for example, is said to develop after particulates, with diameters ranging from 0.2µm to 5µm, stay and accumulate inside lungs.

Pneumoconiosis is a deadly occupational disease which develops over a long period of time but is said to be incurable even with contemporary medicine.

Depending on the type, particulates could cause acute/chronic intoxication, cancer after a set period of time, and such symptoms as bronchial disorder, asthma, and allergy.

In recent years, increasing number of chemical substances has been pointed out as harmful, and stricter regulations and measurements have been required.

The use of particulate respirators appropriate for working environment is important to avoid the risks. In Japan, industrial particulate respirators are required to pass the Japanese national standard and/or Japanese Industrial Standards (JIS T 8151) stated in the Industrial Safety and Health Law of Japan.

Koken’s industrial particulate respirators shown on this catalogue have successfully passed the standards.


Sizes of various particulates

Reference: Particulate substances in the air
Generation Process / Condition
Particulates generated in crushing, cutting, and polishing of solid material, and blending, sieving, and packing of powder material, and fly, float and diffuse in the air. Metal mine, coal mine, quarry, ceramic manufacturing, metallurgic polishing, casting and asbestos.
Particulates generated as a result of evaporation and solidification of solid materials. Particulates generated as a result of such physicochemical reactions as sublimation or oxidation of metals. Lead (lead oxide), and welding fume (ferric oxide).
Liquid particulates that fly, float and diffuse in the air. Foam formulation of solutions generated as a result of gas generation in electrolysis tank and reaction vessel. Coating compounds generated in spray painting.
Solid / Liquid
Particulates generated in the process of combustion of organic substances. The particulates include imperfectly-combusted substances, ash, and moisture. Smoke of quenching oil generated in the process of metal quenching. Smoke of machine oil generated at the overheated area of machine and motor. Smoke of cigarettes.

Examples of particulates and harmful effect
Applications and Generation Sources
Harmful Effect on Human Body
Carbon black
Rubber strengthening agent, black colorant, and conductivity deposition agent
Pneumoconiosis and cancer
Cement dust
Works utilizing cement
Welding fume
Welding, meltdown, and refining
Metal dust
Grinding, smelting, foundry and brazing
Poisoning symptom, pneumoconiosis and cancer *Symptom varies depending on the type of metal.
General dust
Works where mineral substances, soil, stone, and rocks exist
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