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DuPont Personal Protection

Technical Data

CEN: Ensemble Test Methods

There are 3 methods used to evaluate the finished garment performance.

EN 463 - PENETRATION BY JET OF LIQUID
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EN 464 - PRESSURE TEST FOR LEVEL A SUITS
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EN 468 - PENETRATION BY SPRAY OF LIQUID

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EN 463 - TEST METHOD FOR PENETRATION BY JETS OF LIQUID

"Determination of resistance to penetration by a jet of liquid (Jet Test)"

Explanation of Test Method:

A jet nozzle filled with a fluorescent challenge liquid is positioned 1-meter from a test subject wearing the chemical protective clothing being tested (and an absorbent coverall underneath to help detect penetration). The liquid jet is directed at the test material for five seconds and allowed to dry for two minutes there after. The sample is then removed and inspected for any penetration by the challenge liquid. A pass or fail is determined by the size of the stains on the garments from penetration by the challenge liquid if there is any.

Penetration Defined:

The physical transport of a chemical from one side of a material to the other side of the material, such as through imperfections, tears, holes, etc.

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EN 464 PRESSURE TEST METHOD

  "Determination of Leak-Tightness of Gas-Tight Suits (Internal Pressure Test)"

Explanation of Test Method:

Establishes the integrity of totally encapsulated 'gas-tight' chemical suits. Performed on each suit after manufacture and periodically thereafter. A suit is inflated with air to a specified pressure and the pressure drop is measured over time. A maximum allowable pressure drop constitutes pass / fail during the test.

Pressure Test Defined:

This test measures whether or not a totally encapsulating suit is 'gas tight'. All Type 1 and 1ET suits must pass this test before leaving the manufacturing facilities. A pressure test kit is also available to customers for pressure testing suits internally.

The end user does not have to adopt this test as an internal standard. End-users of garments are free to adopt any testing procedures they want. There is work currently ongoing through the CEN and ISO to amend this test method to bring it into line with the revised (May 1997) ASTM 1052 internal pressure test, because it is felt the current test is too severe and potentially damaging to some materials.

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EN 468 TEST METHOD FOR RESISTANCE OF PENETRATION BY SPRAY OF LIQUID

"Determination of resistance to penetration by spray (Spray Test)"

Explanation of Test Method:

A test subject wearing the chemical protective clothing being tested (and an absorbent coverall underneath the garment) is placed on the geometric center of a turntable. Spray nozzles containing a fluorescent challenge liquid are positioned around the test subject at a distance of approximately 1-meter. The liquid is then sprayed for 1 min at the test subject as he/she is rotated on the turntable through 360°. During the spray period the test subject alternately raises each foot approximately 20 cm from the turntable 25 to 35 times with the arms straight and swinging back and forth in unison with the legs. The clothing is then allowed to dry for two minutes. Next the chemical protective clothing being tested is removed and the inside of the garment as well as the absorbent coverall is examined visually for signs of penetration. A pass or fail is determined by the size of the stains on the garment from penetration by the challenge liquid if there is any.

Penetration Test Defined:

The physical transport of a chemical from one side of a material to the other side of the material, such as through imperfections, tears, holes, etc.