Lead is a kind of steel grey heavy metal. There will be lead steam coming out when heating to 400-500℃ and lead smoke or dust will spread during producing lead powder and casting to pollute air. When lead smoke reaches certain concentration, it will be harmful to health.
Dangers of lead seals
Lead is a kind of poison heavy metal which is harmful to human health. When lead and other compounds enter human body, it will be harmful to nerve, blood, digest, kidney, heart and blood vessels, and internal secretion and other systems. If content high, it will lead to poison. Along with rapid development of industry, lead is widely used to various industries and the pollution of lead to environment is also serious, so as to human health. Currently, lead mainly influence health through food, water, and air.
When metal enters body, only small amount can be excreted to outside body along with metabolism and other mostly will remain in body.
For adults, the invasion of lead can damage nerving, digest system, male reproductive system and also influence hemopoiesis function of bones, then, people will have the following bad symptoms, like dizzy, lack of power, dizziness, sleepy, insomnia, anemia, low immune system, Abdominal pain, constipation, body ache, muscle joint, irregular menstruation, etc. some people will have metal flavor in mouth, Arteriosclerosis, digestive tract ulcer and fundus hemorrhage is also related to lead pollution.
For children, because their brains are in developing, and nervous system is in sensitive period, the suction volume is much higher than adults at same lead environment with serious harm. Therefore, if children get lead poison, stunted growth, loss of appetite, difficulty walking, constipation, insomnia will appear, and also Hyperactivity, hearing impairment, concentration and mental retardation. If serious, damage of brain tissue will appear which will possibly lead to permanent disability.
Therefore, at some developed European countries, there is clear rule of lead content.
