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Canadian Centre For Occupational Health And Safety

Blasting agents or explosives may be solids that burn but with an intensity so great that they are classified as explosives. An example of a flammable solid that can be ignited by friction is the chemical formulation on the head of matches. Some metal powders can react with moisture and burn and are thus classified as flammable solids. The analysis as to whether the chemical is a flammable aerosol is more difficult and usually must be based upon laboratory testing of the aerosol as emitted from a pressurized container.

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Nevertheless, knowing the physical properties has great value in predicting whether a substance may pose a physical hazard. If a mixture has been tested as a whole, the results should be used to determine whether the mixture is hazardous. These different types of hazards identified in the HCS are presented in Table 1. Physical hazard means a chemical for which there is scientifically valid evidence that it is a combustible liquid, a compressed gas, explosive, flammable, an organic peroxide, an oxidizer, pyrophoric, unstable or water-reactive.

Exposure to electrical live parts can result in serious injuries and fatalities, including electric shocks, burns, explosions and falls from height. The risk is increased in wet conditions, where a worker’s equipment and surroundings can also become live. Physical hazards are environmental factors that can harm an employee without necessarily touching them. You must be appropriately trained before you carry out any workplace risk assessments.

Confining the build-up of high pressure gases in a drum or vessel, which prevents venting of the gases, may promote an increase in the pressure within the restricted volume until an explosion occurs. Such is the principle behind some munitions, which confine high pressure gases until the pressure exceeds the strength of the casing.

Mixture – any combination of two or more chemicals if the latex allergy combination is not, in whole or in part, the result of a chemical reaction. This document provides guidance as to the processes involved and identifies considerations in the conduct of hazard determinations. Since much of the discussion is of a technical nature, a Glossary of Terms and Definitions is included as Appendix A. Material contained in this publication is in the public domain and may be reproduced, fully or partially, without permission.

In practice, most aerosols are mixtures, usually in air, and are primarily propellant formulations of droplets, particles, gases, and/or vapors. Their flammability is highly dependent on the nature of the propellant formulation. Therefore, data obtained from a literature search that does not pertain to the exact mixture of ingredients in the product may not be relevant when determining the flammability of the product. In the event that you choose to test a chemical product to determine if it is a flammable aerosol, the method described in 16 CFR 1500.45 should be used.

  • It could also mean that available work must be done with fewer staff member.
  • These are just a sample of some funny workplace safety tips that can help workers avoid being injured on the job.
  • These hazards can result in both health and physical impacts, such as skin irritation, respiratory system irritation, blindness, corrosion and explosions.
  • When people get hurt at work, it costs employers in productivity and increased costs for workers’ compensation and other benefits.
  • For example, sexual harassment, victimisation, stress and workplace violence.
  • Employees are affected too, since a job-related accident means lower morale.

One type consists of material capable of supersonic reactions , for example, nitroglycerine and TNT. The other type consists of materials that burn rapidly but at a subsonic rate.

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A positive test is obtained if a flame is projected at least 18 inches at full valve opening, or if there is a flashback (i.e. , a flame extends back to the valve) at any degree of valve opening. The physical properties of a substance can be directly related, in many cases, to the probability of the substance representing a physical hazard. However, the fact that a substance has a certain physical property cannot necessarily be used to predict a physical hazard. For example, all volatile substances are not necessarily explosive. Some solids can also be explosive (e.g. , TNT or grain dust particles).

The analysis as to whether a solid chemical will burn with such intensity to be classified as a flammable solid usually must be based upon the results of laboratory testing. If you choose to test a chemical to determine if it is a flammable solid, such testing should be conducted by the method described in 16 CFR 1500.44. A flammable solid can be ignited readily and then will burn so vigorously as to create a serious fire hazard.

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Examples of this type are gunpowder, rocket propellants, and pyrotechnic mixtures . The difference between fire and explosion is the rate at which high temperature gases are produced and the physical containment of the burning gases. When high temperature gases build up extremely fast, there can be such a sudden release of energy from the gases that a shock wave or explosion is created.

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