危险说明是全球化学品统一分类和标签制度(全球统一制度)【GLOBALLY HARMONIZED SYSTEM OF CLASSIFICATION AND LABELLING OF CHEMICALS (GHS)】的一部分。 他们的目的是形成一套可以翻译成不同语言的有关化学物质或混合物危害的标准化短语。每个危险说明被设计成一个代码，以字母H开头，接着是3个数字。对应相关危害的说明通过代码共同组成，所以代码并不连续。代码用作参考，例如帮助翻译，但是应该出现在标签和安全数据表上。

危险说明分为三部分，即：物理危险、健康危险和环境危险。

代码

危险说明

物理危险

H200

Unstable explosive

不稳定爆炸物

H201

Explosive; mass explosion hazard

爆炸物；整体爆炸危险

H202

Explosive; severe projection hazard

爆炸物；严重迸射危险

H203

Explosive; fire, blast or projection hazard

爆炸物；起火、爆炸或迸射危险

H204

Fire or projection hazard

起火或迸射危险

H205

May mass explode in fire

遇火可能整体爆炸

H206

Fire, blast or projection hazard; increased risk of explosion if desensitizing agent is reduced

起火、爆炸或迸射危险；退敏剂减少时爆炸风险增加

H207

Fire or projection hazard; increased risk of explosion if desensitizing agent is reduced

起火或迸射危险；退敏剂减少时爆炸风险增加

H208

Fire hazard; increased risk of explosion if desensitizing agent is reduced

起火危险；退敏剂减少时爆炸风险增加

H220

Extremely flammable gas

极其易燃气体

H221

Flammable gas

易燃气体

H222

Extremely flammable aerosol

极其易燃气雾剂

H223

Flammable aerosol

易燃气雾剂

H224

Extremely flammable liquid and vapour

极其易燃液体和蒸气

H225

Highly flammable liquid and vapour

高度易燃液体和蒸气

H226

Flammable liquid and vapour

易燃液体和蒸气

H227

Combustible liquid

可燃液体

H228

Flammable solid

易燃固体

H229

Pressurized container: may burst if heated

压力容器：遇热可爆

H230

May react explosively even in the absence of air

即使在没有空气的条件下也可能发生爆炸反应

H231

May react explosively even in the absence of air at elevated pressure and/or temperature

在高压和/或高温下即使没有空气也可能发生爆炸反应

H232

May ignite spontaneously if exposed to air

暴露在空气中可自燃

H240

Heating may cause an explosion

加热可能爆炸

H241

Heating may cause a fire or explosion

加热可能起火或爆炸

H242

Heating may cause a fire

加热可能起火

H250

Catches fire spontaneously if exposed to air

暴露在空气中会自燃

H251

Self-heating; may catch fire

自热；可能燃烧

H252

Self-heating in large quantities; may catch fire

数量大时自热；可能燃烧

H260

In contact with water releases flammable gases which may ignite spontaneously

遇水放出可自燃的易燃气体

H261

In contact with water releases flammable gas

遇水放出易燃气体

H270

May cause or intensify fire; oxidizer

可能导致或加剧燃烧；氧化剂

H271

....