Difference Between Flammable and Combustible, What Are Flammable Items

There are differences between flammable and flammable in terms of nature, range, and concentration limit, as shown below

1. The nature is different.

There is a difference in flammability and flammability in nature, flammability refers to the fact that a substance can be burned with a flame, and flammability is from the perspective that a substance can easily be burned with a flame, if the flammability of a substance is high, then it means that the substance is flammable.

2. The scope is different.

The range of flammable substances is wider than that of flammable substances. Whether gases, liquids, or solids, as long as they are capable of burning under certain conditions, then they are flammable. But for flammability, it is a little more demanding on the substance.

Only solids that are prone to spontaneous combustion or can be burned in contact with water and gases or liquids that are easily flammable can be said to be flammable.

3. The concentration limit is different.

Only when the lower limit of the ** concentration of a substance is less than 20%, or the difference between the upper and lower limits is more than 20%, can the substance be said to be flammable. The flammability requirement is lower.

Flammable: Refers to the fact that it can be burned by itself. Such as: flammable metal elemental (Fe, Al), flammable non-metallic elemental (P, C), flammable gas (CH4, CO), etc.

Combustion: It refers to the fact that the flammable object does not burn itself, but the flammable object is placed in the environment of the combustible object, which can aggravate the combustion of the flammable object. Such as: (o2) and so on.

Flammable gases. 1.Classification of flammable gases.

Grade: Lower Limit <10%: or Limit Range 12 Percentage Points:

Grade: 10% **Lower limit < 13%, and **Limit range < 12 percentage points.

2.Fire hazard of flammable gases.

Flammability and explosiveness (main hazard), diffusion, shrinkage and expansion, chargeability, corrosiveness, toxicity.

3. Flammable liquids.

1.Classification of flammable liquids.

Grade: initial boiling point 35;

Grade: initial boiling point >> 35, and flash point <<23;

Grade: Initial boiling point 35, 23 flash point 60;

Class A flammable liquid: flash point <28;

Class B flammable liquids: 28 flash point<60 ;

Class C flammable liquids: flash point 600C.

2.Fire hazard of flammable liquids.

Flammability, flammability, thermal expansion, fluidity, chargeability, toxicity.

4. Flammable solids.

Flammable solids can be divided into flammable solids and combustible solids according to the ignition point.

A flash point higher than 300 is called a combustible solid, and a flash point lower than 300 is called a flammable solid.

Fire hazard of flammable solids.

Low ignition point and easy ignition; It is flammable and explosive in case of acid and oxidant; Toxic in itself or the combustion product.

5. Oxidizing substances and organic peroxides.

1.Oxide properties.

Definition: A substance that does not inherently combust, but the release of oxygen may cause or cause the combustion of other substances.

Classification: 1) According to the form of matter, it is divided into solid and liquid oxidizing substances.

2) According to the chemical composition, it is divided into inorganic and organic oxidizing substances.

3) According to the strength of oxidation performance, inorganic oxidizing substances are divided into two levels: the primary oxidation is strong, mainly peroxides and salts of alkali metals or alkaline earth metals; The second grade is a stronger oxidant, but it is more stable than the first grade and can cause combustion.

Fire hazard.

1) Decomposition when heated and impacted.

2) Flammability.

3) Spontaneous ignition with flammable liquids.

4) Decomposition with acid.

5) Decomposition with water.

6) Decomposition of strong oxidizing substances and weak oxidizing substances.

7) Corrosive and toxic.

2.Organic peroxides.

Definition: An organic substance containing a bivalent -o-o- structure, which may also be a derivative of hydrogen peroxide.

Fire hazard: decomposition, flammability.

Flammability: The ability of materials or products to be flame incinerated under specified experimental conditions. It contains a number of characteristics related to whether it is easy to ignite and whether it can maintain the ability to incinerate.

It is easy to ignite the situation that the combustible gas is released after heating the data by an external flame; Whether incineration can be maintained depends on whether the heat release of data incineration can heat the surrounding data and continuously release combustible gas. Either the fire is getting bigger and bigger and out of control, or it is getting smaller and smaller and eventually subsided. The flammability of a substance, i.e., the risk of incineration, depends on four factors: flash point, spontaneous ignition point, blasting (incineration) limit and heat of incineration.

Flammability: A mixture of flammable gases or vapors with air that cannot be incinerated or blasted in any share, but has a severe quantity share that varies depending on the conditions.

Flammable conditions: Studies have shown that the incineration reaction is most intense when the combustible gas content in the mixture meets the conditions for complete incineration. If its content decreases or increases, the flame incineration rate decreases, and when the concentration is below or above a certain limit value, incineration and explosion are no longer stopped.

The concentration scale of combustible gas or the mixture of vapor and air that can be blasted when exposed to an open flame is called the blasting concentration limit, the lowest concentration at the time of blasting is called the lower blasting limit, and the highest concentration is called the blasting upper limit. The blasting limit can generally be expressed as the volume fraction of the incineration gas or vapor in the mixture. The lower blasting limit is less than 10%, or the difference between the upper and lower blasting limits is greater than or equal to 20%, generally known as flammable medium, and the flammable medium contained in the pressure vessel mainly refers to flammable gas and liquefied gas.

Flammable and does not require external factors to burn on its own; Flammable means that it requires an external aid to burn.

Solid combustibles, such as wood, paper, cloth, etc. Combustible liquids such as gasoline, paint, alcohol, etc. Combustible gases, such as coal gas, natural gas, liquefied petroleum gas.

acetylene gas, etc. <

Solid combustibles, such as wood, paper, cloth, etc.

Combustible liquids such as gasoline, paint, alcohol, etc.

Combustible gas, such as: coal gas, natural gas, liquefied petroleum gas, acetylene gas, etc.

In order to prevent fire, we should classify items when storing them, which can be divided into six categories according to different categories of items:

Class I Class A Heavily Dangerous Goods, including liquids with a flash point of less than 28 degrees, ** lower limit.

Less than 10% of the gas, at room temperature can decompose or oxidize in the air can lead to rapid natural or ** substances, acid, heat, impact, friction and organic matter and other flammable inorganic substances, impact, friction or contact with oxidants, organic matter can cause combustion or ** substances. Otherwise, alcohol, formaldehyde, metal potassium.

sodium and so on; <>

The second category of Class B dangerous goods includes: liquids with a flash point of not less than 28 degrees and less than 60 degrees, gases with a lower limit of not less than 10%, oxidants that do not belong to Class A, combustible gases, and items that can be slowly oxidized in contact with air at room temperature, and spontaneous combustion caused by heat accumulation, such as kerosene and carbon monoxide.

rosin, oil and its products, oil paper and its products, etc.;

The third category is Class C dangerous goods, which refers to liquids and combustible solids with a flash point of not less than 60 degrees, including animal oil, vegetable oil, asphalt, wax, and chemical man-made fibers.

paper, cotton, wool, silk, linen, and fabrics, etc.;

The fourth category is Class D dangerous goods, which refer to hard-to-burn goods, such as self-extinguishing plastics and their products.

The fifth category is non-combustible products, such as just now, aluminum, glass, etc. Although these items are not dangerous, many of their packaging is flammable, such as wooden boxes and cardboard boxes, and these belong to Category C.

Fires do not happen by chance, everything can be prevented, and the first step is to sort the items, especially the co-created warehouses and the like.

1. All substances that can react with oxygen or other oxidants in the air are called combustibles, combustibles are divided into three categories according to their physical state: gas combustibles, liquid combustibles and solid combustibles, most of the combustible substances are compounds containing carbon and hydrogen, some metals such as magnesium, aluminum, calcium, etc. can also be burned under certain conditions, and many substances such as hydrazine and ozone can release light and heat through their own decomposition at high temperatures.

2. There are many kinds of combustibles, according to different chemical structures, combustibles can be divided into inorganic combustibles and organic combustibles, inorganic combustible combustibles in the inorganic elements are potassium, sodium, calcium, magnesium, phosphorus, sulfur, silicon, hydrogen, etc., inorganic compounds carbon monoxide, ammonia, hydrogen sulfide, phosphine, carbon disulfide, hydrazine, hydrocyanic acid, etc., organic combustibles can be divided into low molecular weight and high molecule, and can be divided into natural and synthetic, In addition to polyhalogenated hydrocarbons such as carbon tetrachloride and other non-combustible and can be used as fire extinguishing agents, most of the other organic compounds are combustibles, organic combustibles include natural gas, liquefied petroleum gas, gasoline, kerosene, diesel, alcohol, soybean oil, coal, wood, cotton, linen, paper and three major synthetic materials.

1. All substances that can react with oxygen or other oxidants in the air are called combustibles, combustibles are divided into three categories according to their physical state: gas combustibles, liquid combustibles and solid combustibles, most of the combustible substances are compounds containing carbon and hydrogen, some metals such as magnesium, aluminum, calcium, etc. can also be burned under certain conditions, and many substances such as hydrazine and ozone can release light and heat through their own decomposition at high temperatures.

2. There are many kinds of combustibles, according to different chemical structures, combustibles can be divided into two categories: inorganic combustibles and organic combustibles, inorganic combustibles in inorganic combustibles are potassium, sodium, calcium, magnesium, phosphorus, sulfur, silicon, hydrogen, etc., inorganic compounds carbon monoxide, ammonia, hydrogen sulfide, phosphine, carbon disulfide, hydrazine, hydrocyanic acid, etc., organic combustibles can be divided into low molecular weight and high molecule, and can be divided into natural and synthetic, in addition to polyhalogenated hydrocarbons such as carbon tetrachloride and other non-combustible and can be used as fire extinguishing agents, Most of the other organic substances are combustibles, organic combustibles include natural gas, liquefied petroleum gas, gasoline, kerosene, diesel, **, alcohol, soybean oil, coal, wood, cotton, linen, paper and three major synthetic materials.