PERFORMANCE REQUIREMENTS AND TEST METHODS FOR PROTECTIVE CLOTHING AGAINST INFECTIVE AGENTS
This standard specifies requirements and test methods for reusable and limited use protective clothing providing protection against infective agents.
Protective Clothing against infective agents; bacterial, viral and other micro-organisms has two main functions:
- To prevent infective agents from reaching (possibly injured) skin.
- To prevent the spreading of infective agents to other people and other situations eg. eating or drinking.
For materials to comply with EN14126, they must undergo 5 additional tests as follows:
Penetration test using synthetic blood
This text identifies the pressurisation at which the infected synthetic blood penetrates the material. The higher the class, the greater the protection of the fabric.
Resistance to penetration by biologically contaminated aerosols
This test is used to assess the barrier's effectiveness against biologically contaminated aerosols. A bacterium solution is suspended in an aerosol and sprayed on to both an unprotected cellulose nitrate membrane and one covered with the test material. Both membranes are analysed to establish the bacterial load and the results are classified by the penetration ratio. The higher the class, the greater the protection of the fabric.
Resistance to penetration by bacteria
This test superimposes a bacterially contaminated donor material on the test material and subjects it to mechanical rubbing. The results are recorded in accordance with breakthrough times ie. the point at which the bacteria penetrates the barrier material measured in minutes as highlighted in the table below. The longer the breakthrough time, the higher the class and therefor the greater the protection of the fabric.
Resistance to penetration by contaminated dust
A pre-sterilised material is fixed in a testing apparatus and administered with contaminated talcum powder (Bacillus Subtilis). An agar plate is placed underneath the material while it is shaken. The particles, which penetrate the material, are analysed after incubation of the agar plate and the results are measured in penetration log units as highlighted in the table below. The higher the class, the greater the protection of the fabric.
Resistance to penetration by viruses
This test uses a liquid (instead of synthetic blood) contaminated with a bacteriophage or virus to identify the pressurisation at which the liquid penetrates the material. The higher the class, the greater the protection of the fabric.