EN
ZHEN 60903: 2003 + Amendment 15049 and 16512
Live working. Gloves of insulating material.
Electrically resistant gloves are tested to EN 60903: 2003. Standard assessments include checks on dimensions, finish, marking and packaging plus tests on basic mechanical performance, dielectric properties, the effects of various ageing treatments and thermal tests. The basic mechanical performance tests cover tensile strength and elongation at break, puncture resistance and tension set. Several performance levels are available for the dielectric tests up to a maximum use voltage of 36,000V ac or 54,000V dc.
High Voltage Test
The gloves are filled with water and immersed in a tank of water. One electrode is placed inside the glove and another in the tank of water. The voltage between the two electrodes is gradually increased up to a defined level where it is held for a preset time. While the voltage is applied, any leakage current between the two electrodes is measured and must not exceed defined limits. The voltage is then increased further to ensure the gloves do not suffer any form of mechanical breakdown (such as puncturing). The test is also carried out using gloves that have been exposed to various pre-treatments.
Tensile Test
A tensile test machine is used to gradually extend dumbbell shaped specimens that have been cut from the gloves. During this process both the force applied to the specimen and the extension of the specimen are recorded. The test is carried out using samples that have been subject to a pretreatment, the results for which are compared to those which have not.
Ozone Machine
This consists of a chamber, for storing samples such as those cut from gloves, plus equipment for generating ozone at set concentrations while also controlling temperature and humidity within the chamber. Glove samples are stored in the chamber for a defined period of time before being visually assessed and subject to electrical proof tests to assess any possible degradation.