垂涎闺蜜老公许久终于逮到机会趁闺蜜怀孕帮忙解决老公性需求超主动服务

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Nickel Release Testing
2020/7/14 18:20:24
Nickel Release Testing 


Nickel (Ni) is a kind of element that easily leads to allergy. Ni will be absorbed by skin in touch with the material containing Ni releasing. The most common allergy is that sweating makes Ni release in touchable parts. According to statistics, 20% of people have the Ni allergy. Clothing, jewelry and some commodity exporting to Europe are required to test Ni release commonly if the contents have metal accessories containing Ni.

EU the REACH Regulation No.1907/2006 XVII Safety Requirements

Nickel usually exists in plating, stainless steel and other alloys. Prolonged contact with excessive nickel may cause severe sensitization and lead to Dermatitis. In order to reduce these risks, the Nickel release was prescribed in Nickel Directive94/27/EC. Not until July 20 1999, EU published three standard—EN1810, EN1811 and EN12472 to state more accurate analysis method for nickel release , which shows precise quantitative analysis will be made to Nickel release. These procedures particular for specific group of metal products are list as below:

Standard

Scope

Limit

EN1810

Body-piercing assemblies

<0.05%Ni

EN1811

Body-piercing assemblies

<0.2μg/cm2/Week

Products directly prolonged contacting  with skin

<0.5μg/cm2/Week

EN12472

Coated items directly prolonged contacting with skin

<0.5μg/cm2/Week

Requirements of the Directive: For the following products, shall not be placed on the market unless they conform to the requirements.

(a.) in any post assemblies which are inserted into pierced ears and other pierced parts of the human body unless the rate of nickel release from such post assemblies is less than 0.2 μg/cm 2 /week (migration limit);

(b.) in articles intended to come into direct and prolonged contact with the skin such as:

—earrings

—necklaces, bracelets and chains, anklets, finger rings

—wrist-watch cases, watch straps and tighteners,

—rivet buttons, tighteners, rivets, zippers and metal marks

when these are used in garments, if the rate of nickel release from the parts of these articles coming into direct and prolonged contact with the skin is greater than 0.5 μg/cm2/week.

General methods for the Detection: according to the requirements of Directive 94/27/EC, items should be tested in accordance with the appropriate European harmonised standard(s), the references of which have been published by the European Commission in the Official Journal of the European Communities. , these are EN1811 and EN12472. The standards specify a quantitative method for the release of nickel from articles.

Procedure of the Detection: The item to be tested for nickel release is placed in an artificial sweat test solution for one week. The concentration of dissolved nickel in the solution is determined by atomic absorption spectrometry, inductively-coupled plasma spectrometry or other appropriate analytical method. The nickel release is expressed in micrograms per square centimetre per week (mg/cm2/week).

 

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垂涎闺蜜老公许久终于逮到机会趁闺蜜怀孕帮忙解决老公性需求超主动服务