IEC SYSTEM FOR CONFIRMITY TESTING
AND CERTIFICATION OF ELECTRICAL
EQUIPMENT
COMMITTEE OF TESTING LABORATORIES
TESTING AND MEASURING EQUIPMENT/ALLOWED SUBCONTRACTING
IEC 62321-7-1 ED. 1.0 (2015-09)
Part 7-1: Determination of certain substances in electrotechnical products: Hexavalent
chromium - Presence of hexavalent chromium (Cr(VI)) in colourless and coloured
corrosion-protected coatings on metals by the colorimetric method
PROVISIONAL
(to be approved at the 53rd CTL Plenary meeting 2016)
R = Required to be at Lab
S = May be subcontracted
W = May be witnessed at MTL
SF = Specialized Facility
3PPS = Three Phase Power Supply required
2015-10-19
1(3)
IEC 62321-7-1 ed 1.0 (2015-09)
IEC SYSTEM FOR CONFIRMITY TESTING
AND CERTIFICATION OF ELECTRICAL
EQUIPMENT
Clause
Measurement/testing
4
4.1
4.2
Reagents
General
Reagents
5
5.1
Apparatus
General
5.2
Apparatus
2015-10-19
COMMITTEE OF TESTING LABORATORIES
Testing / measuring equipment / material needed Subcontracting
Use only reagents of recognized analytical grade, unless otherwise specified
1,5-diphenylcarbazide, analytical reagent grade
Potassium dichromate (K2Cr2O7) stock solution (see IEC 62321-7-1, clause
4.2 b) for details)
Potassium dichromate (K2Cr2O7) equivalent comparison standard solutions
(see IEC 62321-7-1, clause 4.2 c) for details)
Acetone, analytical reagent grade
Orthophosphoric acid (H3PO4) solution (75 % (m/m)), analytical reagent
grade
Water: Grade 1 specified in ISO 3696, which shall be free of interferences
All re-usable labware (glass, quartz, polyethylene, polytetra fluoroethylene (PTFE), etc.) including the sample containers shall be
soaked overnight in laboratory-grade detergent and water, rinsed
with water, and soaked for 4 h or more in a 20% (v/v) HNO 3 or in a
mixture of dilute acids (HNO 3 :HCl:H 2 O = 1:2:9 by volume) followed
by rinsing with water. Alternative cleaning procedures are permitted,
provided adequate cleanliness can be demonstrated th rough the
analysis of method blanks
Analytical balance with an accuracy of 0,10 mg
Thermometer or other temperature measurement device capable of
measuring up to 100 °C
Boiling chips
Volumetric glassware: Class A glassware, 100 ml, or equivalent of
acceptable precision and accuracy. Alternative volumetric equipment
(e.g. automatic dilutors) with equivalent precision and accuracy can
be used
Assorted calibrated pipettes: Class A glassware or other with
equivalent precision and accuracy
2(3)
S
S
IEC 62321-7-1 ed 1.0 (2015-09)
IEC SYSTEM FOR CONFIRMITY TESTING
AND CERTIFICATION OF ELECTRICAL
EQUIPMENT
Clause
Measurement/testing
COMMITTEE OF TESTING LABORATORIES
Testing / measuring equipment / material needed Subcontracting
Borosilicate glass or quartz beaker with volume graduation of
250 ml, or equivalent
Heating device: capable of maintaining boiling of the extraction
solution
Filter membranes (0,45 m), cellulose-based or polycarbonate types
preferred
Silicon carbide (SiC) grinding paper with 800 grit size, or equivalent
Watch glass
Colorimetric instrument: either a spectrophotometer for use at
540 nm providing a light path of 1 cm or longer; or a filter photometer
providing a light path of 1 cm or longer and equipped with a
greenish-yellow filter having maximum transmittance near 540 nm
Note: The presence of equipment alone does not indicate a satisfactory situation. Assessors must evaluate the
equipment design, calibration, uncertainty and documentation to ensure compliance with the directions of the
standard. The requirements of ISO IEC 17025 regarding validation are applicable, as the tests of this standard
are not standardized tests.
2015-10-19
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IEC 62321-7-1 ed 1.0 (2015-09)