Normal air is primarily composed of 78% nitrogen, 21% oxygen, and a small percentage of inert gases. However, when harmful substances are present—such as any gaseous or particulate matter not normally found in the atmosphere and at concentrations exceeding the limits set by national occupational hygiene standards—it becomes a respiratory hazard.
Harmful substances in the air can exist in five main forms:
1. Dust: Tiny solid particles suspended in the air, typically created by mechanical processes that break down solid materials. Examples include coal dust, cement dust, and asbestos fibers. These particles can be inhaled and cause long-term health issues if not properly controlled.
2. Smoke: Very fine solid particles that form when gases or vapors condense. Smoke from welding, for instance, consists mainly of metal oxides and can be highly dangerous when inhaled.
3. Fog: Small liquid droplets suspended in the air, often generated by spraying liquids. This includes things like paint mist or chemical mists used in industrial settings.
4. Gases: Harmful substances that exist as gases under normal temperature and pressure conditions. Common examples include chlorine, carbon monoxide, hydrogen sulfide, and sulfur dioxide, which can be toxic even in small amounts.
5. Vapors: Gaseous forms of substances that are originally in liquid or solid form at standard conditions. Benzene, toluene, gasoline, and mercury vapor are all examples of this type of airborne contaminant.
Dust, smoke, and fog are collectively known as particulates or aerosols. These particles are usually odorless, and the smaller they are, the longer they remain suspended in the air and the more likely they are to be inhaled. Our respiratory system has natural defenses to trap larger particles, but those smaller than 10 to 7 microns can bypass these defenses and reach the alveoli in the lungs. Over time, this accumulation can lead to serious health problems such as pneumoconiosis. Respiratory dust refers to fine particles that are not visible to the naked eye, typically less than 10 microns in size. Larger particles, visible to the eye, are generally too big to be inhaled deeply into the lungs. That’s why welding smoke may appear visible in certain conditions, but once it disperses, it becomes invisible to the naked eye.
China Labor Insurance Network
Wire Mesh: Wire mesh refers to a grid-like structure made from intersecting wires. It can be constructed using various materials, such as stainless steel, galvanized steel, or aluminum. Wire mesh is available in different mesh sizes, wire diameters, and weave patterns (such as square or rectangular). It serves a wide range of purposes, including filtration, screening, reinforcement, and containment.
Wire Mesh Fence: A wire mesh fence is a type of fencing system that utilizes wire mesh panels or rolls to create a barrier. It typically consists of metal posts and horizontal rails that support and hold the wire mesh in place. Wire mesh fences are commonly used for residential, commercial, and industrial applications, such as property boundaries, security enclosures, and animal enclosures. They offer visibility, durability, and versatility.
Welded Wire Mesh Panels: Welded wire mesh panels are prefabricated panels made by welding intersecting wires together. The welding process creates strong and durable connections between the wires, resulting in a rigid mesh structure. Welded wire mesh panels are commonly used for various applications, including fencing, security barriers, machine guards, and construction reinforcement. They provide excellent strength, stability, and uniformity.
Bird Hexagonal Wire Mesh: Bird hexagonal wire mesh, also known as bird netting, is a type of wire mesh with a hexagonal pattern specifically designed to prevent birds from entering or leaving an area. It is typically made from galvanized steel wire or plastic materials. Bird hexagonal wire mesh is commonly used to protect crops, gardens, and buildings from bird damage. The small mesh size effectively prevents birds from accessing the protected area while allowing airflow and visibility.
These different types of wire meshes, including wire mesh, wire mesh fence, welded wire mesh panels, and bird hexagonal wire mesh, offer versatile solutions for various applications. The specific choice depends on factors such as the intended purpose, desired strength, durability, and the environment in which the wire mesh will be used.
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