Step 2: Determine minimum levels of protection needed In other words, determine the degree(s) of exposure level(s) to identify a potential suitable minimum garment CE-Type . The designation of six separate Types of protection within CE Category III chemical protective clothing is intended to facilitate the selection as a function of the nature of the hazard exposure. Certiﬁ cation to a particular protection Type represents the tightness of the garment against a particular form of exposure (gas, liquid or dust). However it does not mean that the item is 100% impervious to this type of exposure. For further details please refer to Annexe 1 and Annexe 2.
Step 3: Assess hazard toxicity Knowing the toxicity or consequences of short- or long-term exposure to a hazard is essential. With this in mind, consider whether a coverall has been tested to the following standard: EN ISO 6529 which gives information concerning the chemical permeation and penetration of the fabric where the chemical is tested up to 480 minutes and a minimum of 10 minutes. Further assistance can be accessed in the Instructions for Use attached to DuPont products packaging, where you can ﬁ nd permeation data for a selection of chemicals. Detailed permeation data for over than 450 chemicals can be accessed on www.safespec.dupont.co.uk.
Step 4: Determine protective performance requirements of the fabric and seam When it comes to protective apparel, it is crucial to differentiate between penetration and permeation (please see Annexe 4 and refer to the DuPont Permeation Guide.) Penetration is the physical process whereby a liquid, vapour or gas passes through the material via pores or holes in the fabric. It is more relevant when referring to particle penetration of a fabric or whole suit. Permeation is the process by which a chemical, in the form of a liquid, vapour or gas, moves through protective clothing material on a molecular level. Garment protection performance, penetration and permeation is relevant for garment seams since a garment s protective ability cannot afford to be compromised by weak and pervious fabric joints. Therefore it is important to verify the seam performance in addition to the fabric performance (please see Annexe 4).
THE 9-STEP GUIDE FROM DUPONT TO GARMENT SELECTION