AATCC 134:2016 pdf download.Electrostatic Propensity of Carpets
9.1 Test TM 134 Static Unprotected Control Carpet without an underlay (to avoid charging the underlay) and the Static Protected Control Carpet with an underlay at the beginning of each testing session. If the results are outside of the test laboratory’s Control Chart Control Limits, then seek the cause of the deviation and correct the problem. Check relative humidity and temperature (current values and recorded values during the specimen conditioning period) (see 6.1). Test backup Control Carpets if available (see 6.6), reclean soles (see 9.7) and check instrument calibration. Use a blowing-fan. handheld, balanced high-voltage ionizer to neutralize any charge on the underlay pad between tests and prior to testing any specimen. moving it slowly over the entire surface at a height of about l(X)-2(X) mm above it for at least 1 mm.
9.2 Test the specimen once a day until two reproducible voltages are obtained. Voltages are considered reproducible when consecutive tests agree within 10% or 0.5 kV. whichever is greater. Leaving the specimen in the test chamber overnight should allow any static charges to be dissipated. This process may be accelerated by using a blowing-fan, balanced high-voltage ionizer to neutralize any charges. If an ionizer is used to thoroughly neutralize the specimen (held about l(X)-2(X) mm above the specimen and moved slowly over its entire surface, requiring approximately 1-2 mm). the same specimen may be retested the same day.
9,3 Test the specimen over the standard underlay (see 6.5), which is placed on the grounded metal plate.
9.3.1 Residual static charges on the specimen and underlay have been found to be a major source of error. Residual charges should decay naturally over a period of several hours. Specimens should he hung undisturbed 11w a minimum of 4 h, or thoroughly neutralized with a blowing-fan. balanced high-voltage ionizer. prior to each testing, as above.
9.3.2 Lay the underlay on the grounded metal plate, rubberized side up. Avoid dragging the underlay across the surface or rubbing different parts of it together.
9.3.3 If a blowing-fan, balanced high- voltage ionizer is available, thoroughly and slowly cover the entire surface of the underlay with the ionizer output. holding the ionizer about 100-200 mm above the underlay. This will neutralize any residual charges from handling.
9.3.4 Lay the specimen on the underlay carefully to avoid excessive friction against the mat or rubbing different parts of it together.
9.3.5 If a blowing-fan, balanced highvoltage ionizer is available, thoroughly and slowly cover the entire surface of the sample with the ionizer output, holding the ionizer about 100-200 mm above the sample. This will neutralize any residual charges from handling.AATCC 134 pdf download.