DeFelsko Certified Thickness Standards for Coating Thickness Gage Overview
Overview
DeFelsko Certified Thickness Standards are used to verify the accuracy and operation of coating thickness gages. They are an important component in fulfilling both ISO/QS-9000 and in-house quality control requirements. Contracts often specify that coating thickness measurements be taken by gages whose measurement accuracy is traceable to a National Metrology Institute such as NIST or PTB.
Standards are typically purchased as an accessory to DeFelsko coating thickness gages. Many customers find it more practical to verify the accuracy of their own gages in-house, rather than utilize DeFelsko’s calibration services. This is particularly true when many gages are in use and/or when accuracy verification is performed often.
Five types of coating thickness standards available. Click on each heading for more info.
DeFelsko Certified Coated Metal Plates
Certified Coated Metal Plates are the best solution for verifying the calibration, accuracy and operation of most magnetic, eddy current or ultrasonic coating thickness gages including magnetic pull-off gages as well as many competitive models. They fulfill both ISO and in-house quality control requirements. At ±0.43 µm (±0.017 mil), Certified Coated Metal Plates are our most accurate solution.
DeFelsko Certified Polystyrene Blocks
Certified Polystyrene Blocks are for use with gages that measure over 1500 µm (60 mils). They have an accuracy of ±(2.5 µm + 0.05% of thickness) = ± (0.1 mil + 0.05% of thickness).
DeFelsko Certified Plastic Shims
Certified Plastic Shims (foils) provide an economical alternative to coated metal plates. They have a reduced accuracy of ±2 µm (±0.08 mil). A coating thickness gage measures shim thickness when this shim is placed over a smooth metal surface (zero plate). Alternatively, they can be placed over an uncoated metal substrate. They are not suitable for use with magnetic pull-off gages.
DeFelsko Non-Certified Plastic Shims
Non-Certified Plastic Shims (foils) provide a quick operational check of the instrument and they allow the user to perform practice measurements when placed over metal. They are not suitable for use with magnetic pull-off gages.
Zero plates are uncoated steel (1018 steel) or aluminum (6061-T6) disks. A zero plate is included with most coated metal sets. The first gage measurement is on a zero plate to verify that the gage measures zero correctly. Electronic gages can usually be adjusted to “0” if necessary. A zero plate is also a convenient base onto which a plastic shim or polystyrene block can be placed for measurement. Plate Diameter: 38 mm (1.5")
