Common Harmful Substances And Standard Of Use In Children'S Shoes

The harmful substances commonly found in children's shoes are free or partially hydrolyzed formaldehyde, which can decompose harmful aromatic amine dyes, heavy metals, six valent chromium, two phthalate esters, etc.

First, free or partially hydrolyzed formaldehyde.

Formaldehyde containing shoes in the process of wearing, part of the free formaldehyde and hydrolysis of formaldehyde will be released, the human senses have a strong stimulation, excessive formaldehyde can cause inflammation of the human mucosa and respiratory tract, but also can cause dermatitis; long-term exposure to formaldehyde, will affect the body's immune system, but also interfere with the DNA replication process, leading to cancer.

Free or partially hydrolyzed formaldehyde in children's shoes may come from adhesives, foam materials, etc.

Fur,

And so on.

The existing standard for children's shoes mainly limits the requirements for formaldehyde in textiles, leather and fur.

Two. Decomposition of harmful aromatic amine dyes.

Azo dyes are synthetic dyes which are widely used in coloring textiles and leather.

Most azo dyes are not carcinogenic in nature, and in the long term contact with humans, dyes can be absorbed by the skin and spread in the body.

Under the biochemical reaction condition of normal metabolism of human body, it may reduce and decompose the harmful aromatic amine, and change the structure of human DNA through activation, cause the human body pathological changes and induce cancer.

The existing standard for children's shoes mainly limits the requirements for the decomposition of harmful aromatic amine dyes in textiles, leather and fur.

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Three, six valent chromium

The toxicity of six valent chromium is caused by the destruction of cell structure by six valent chromium and its intermediate valence or free radicals.

Studies have shown that the concentration of six valent chromium at 0.5mg/L can cause 50% of renal epithelial cells to die.

Six valent chromium is easily absorbed by the skin, resulting in chronic skin rashes and ulceration, which can be carcinogenic by its mutagenic effect.

The main reason for the formation of six valent chromium in leather is the chromium powder which has not been completely reduced, the chromium containing pigment, and some trivalent chromium in the tanning or storage process are oxidized to six valent chromium.

Four. Heavy metals

Heavy metals refer to metals with a specific gravity greater than 5 (generally referred to as metals with a density greater than 4.5 grams per cubic centimeter), and there are about 45 kinds of metals.

The heavy metal injury in children's shoes mainly refers to three kinds of lead, cadmium and arsenic.

Heavy metal is a kind of metal that can precipitate in the food chain and soil. The heavy metals contained in shoes products will pollute the natural environment such as water and soil after being discarded.

In the process of wearing, children's feet sweat easily, while infants like to gnaw and touch items that can be touched. Sweat and saliva may also be poisoned by heavy metals.

Five, o-phenyl two formic acid ester

O-phthalate two can enter the body through respiratory tract, digestive tract and skin. It can affect the endocrine of organism, harm the liver and kidneys of children, and cause premature puberty in children.

The two phthalate esters may come from coatings, plastics, printing coatings, etc.

At present, only in the GB30585-2014 "children's shoes safety technical specification", there is a limited requirement for the O-benzyl two formic acid esters in children's shoes. The limit value of children's shoes is DEHP, DBP, BBP is not more than 0.1%, the limit value of infant's shoes is DINP, DIDP, DNOP is not more than 0.1%, DEHP, DBP and BBP are not more than 0.1%.