CTOPeage Protective Gloves General requirements and test methods.

EN ISO 21420: 2020

Protective gloves. General requirements and test methods



This standard is meant to make sure that the gloves themselves don 't cause harm to the wearer and are comfortable to wear, without impeding the protective properties to the user.



Tests and requirements include the chemical innocuousness of glove materials (including, pH value, Chromium VI, Azo dyes, PAHs nickel release and DMFa ©C see below) also as optional requirements for water vapor transmission and absorption of materials and new considerations for donning and doffing of gloves with a layered construction. Procedures to see the sizing of the glove and therefore the effect on finger dexterity also are covered.



General requirements for the knowledge to be provided with and marked on the glove also are outlined during this standard.



Length

The length of the glove is measured by suspending it from the middle finger with a graduated rule having a rounded tip designed to suit the tip of the finger. The glove is manipulated to get rid of any wrinkles or folds and therefore the minimum length is recorded. EN ISO 21420 doesn 't include an inventory of minimum lengths for every glove size, however, gloves for special purpose may specify a minimum length but in such situations the manufacturer must demonstrate that they're fit special purpose by a press release within the user instructions.





Sizing / Dexterity

Gloves are fitted on a hand of the dimensions that they're intended to suit and comments are made regarding comfort and fit. The wearer will then attempt to devour pins of varying size to supply a sign of dexterity. Five pins are defined of diameter from 5 mm to 11mm, clearly the smaller the diameter which will be picked up the greater the dexterity result.





pH Value

The determination of pH value of both leathers and textiles on a glove is required. This pH value shall be greater than 3.5 and fewer than 9.5. The test samples are taken from the palm of the glove, if other a part of the glove contains different material, these materials shall be tested separately. A prepared test sample is extracted in water by mechanical shaking; the aqueous extract is then decanted and therefore the pH value determined by a pH meter. An excessive amount of acid or alkali during a material has been linked to skin dermatitis and should indicate poor process control.





Chrome VI

Each leather shall be tested separately and suits the need of not up to 3mg/kg of chromium VI. The soluble chromium VI is leached from the leather during a phosphate buffer and therefore the chromium VI content within the extract is quantified by High Performance Liquid Chromatography, or by a UV spectrophotometer. Chromium VI may be a restricted substance under REACH annex XVII and a known allergen.



Azo dyes

Azo colourants are dyes which have can produce an enormous sort of colours with good colour fastness properties. There are not any restrictions on the utilization of azo dyes, but restrictions do exist on 22 aromatic amines which may be derived from them. Applicable to all or any dyed leathers and textiles. Requirement: not up to 30mg/kg for every of the carcinogenic aromatic amines.



PAHs

Polycyclic aromatic hydrocarbons ( PAHs) are large aromatic structures that contains Carbon and Hydrogen only and are applicable to rubbers and plastics in direct contact with the skin. Requirement: not up to 1mg/kg of every of the eight restricted PAHs.



Nickel release

Relevant for gloves that contain metallic components which inherit prolonged contact with skin. If the metallic component is coated with a non-nickel coating, a corrosion step is administered before testing to simulate wearing of the component in touch with the skin. Requirement: not up to 0.5©©g/cm2/week.



DMFa

Dimethylformamide ( DMFa) is adopted as a solvent within the polymerisation of polyurethane (PU). this will alter the viscosity of the reaction mixture and thus the final product. Applicable to all or any materials containing polyurethane (PU). Requirement: not up to 1,000mg/kg.