1. Avoid contact with humid air. Avoid contact with strong oxidant, strong reducing agent, strong acid, strong alkali, alkali metal and water. Orthorhombic crystal is colorless acicular or flaky crystal. It is soluble in water to form maleic acid. It dissolves in ethanol and forms ester. It is soluble in ethanol, ether and other organic solvents, but insoluble in petroleum ether and carbon tetrachloride. It reacts with hot water to form maleic acid.

易于烯类单体进行共聚反应；也可进行均聚。与二元醇反应生成线型不饱和聚酯，与三氧化硫反应生成磺化顺丁烯二酸酐。可燃。有毒，溅及皮肤时要用大量清水冲洗。设备要密闭，操作人员要穿戴好防护用具。

It is easy to carry out copolymerization of olefin monomers and homopolymerization. Linear unsaturated polyester was formed by reaction with diols, and sulfonated maleic anhydride was formed by reaction with sulfur trioxide. Combustible. Toxic. Wash with plenty of water when splashing on skin. The production equipment should be sealed and the operators should wear protective equipment.

2.该品有毒。其毒性比顺酸大，能刺激皮肤及黏膜。当人体接触高温液体时，其刺激性更为严重，能造成皮肤灼烧伤，结膜、角膜红肿，严重时导致视力减退甚失明。

2. The product is poisonous. It is more toxic than CIS acid and can stimulate skin and mucous membrane. When the human body is exposed to high temperature liquid, its irritation is more serious, which can cause skin burn to injury, conjunctiva, corneal redness and swelling, and even lead to vision loss or blindness.

对大鼠经服LD50为400mg/kg。小鼠经口LD5060~465mg/kg。在空气中高容许浓度0.25*10-6。当溅及皮肤时要用大量清水冲洗。设备要密闭，操作人员要穿戴好防护用具。

The LD50 of rats was 400 mg / kg. Ld5060 ~ 465mg / kg by oral administration in mice. The high allowable concentration in air is 0.25 * 10-6. When splashing on the skin, rinse with plenty of water. The production equipment should be sealed and the operators should wear protective equipment.

3.存在于烟气中。

3. Exist in flue gas.

4.强烈的刺激性，引起烧伤，吸入可引起肺水肿。易被酯化。加热到150℃以上放出乙酸。溶液加热到100℃发生分子断链。

4. Strong irritation, cause burns, inhalation can cause pulmonary edema. It is easy to be esterified. When heated to 150 ℃, acetic acid is released. When the solution is heated to 100 ℃, the molecular chain breaks.