MOPAS XS Polisher

High Performance Paint Cross Section Making

The MOPAS polisher is a device for making highly polished surfaces of embedded paint cross sections. It was developed to avoid the accumulation of resin films on the polished surface caused by keeping the resin block between your fingers on the “sand” paper and/or polishing cloths. The MOPAS polisher clamps the sample block in a jig. That way the block can’t move or change position with respect to the rough polishing material. This ensures clean cuts and a great final polish.

 The MOPAS  Cross section Polishing Holder

Hand polishing of embedded paint block leads to uneven cross section surfaces unfit for advanced microscopic spectroscopy. The Molecular Painting Studies Group (MOPAS) at AMOLF developed a resin block holder for an improved polished surface using dry polishing technique on Micromesh clothes. The CPH is also suitable for making thin sections up to about 15 micron.

The present generation MOPAS CPH7 is now available for sale from JAAP Enterprise. Conservation and Art Research Departments in museums and institutions in Europe, America and Australia are using it now.

polijster A

Improvements are reported in imaging Fourier Transform micro-spectroscopy (micro-FTIR), Raman micro-spectroscopy, secondary ion mass spectroscopy, Xray Photonelectron spectroscopy (XPS) and antibody mediated surface analysis.

MOPAS CPH7 has 5 exchangeable jigs for different resin block morphologies. The fine regulation of the feed system makes micrometer advancing possible. The ceramic ring keeps the resin block surface level with respect to the Micromesh cloth.

 

Top view

polijster zijkant

The central hole gives access to the screw that fastens the jig at the bottom. The holes marked with 1, 2 or 3 dots give access to screws that adjust the angle of the jig. The other holes contain the spring that keep the jig in position.

The ceramic crown hardness 9 is the contact with the sanding and polishing surface. The ring fixes the position of the lower part of the polisher with respect to the resin sample block.

 Side view

polisher onderzijde plus klein monster

Bottom view

Embedded samples are mounted in the jig with positioning screws. The position of the sample block surface is set by adjusting the position of the ceramic ring. For grinding position about 50 microns above the plane determined by the ceramic feet is best. For polishing the ceramic ring position must be fixed before moving from the 4000 via 6000 to 8000 or 12 000 mesh polishing clothes.

Five different jigs are available:

a. flat for glue mounting
b. square resin block mounting
c. round resin block mounting
d. Easysection ™ mounting
e. thin resin block mounting

Jig a, b and e are standard delivery
Special dedicated jig can be designed upon request.

jigs for mopas xs

Tips for best results:
Request PDF Do’s and Don’ts in polishing with the CPH7

Micromesh polishing clothes gives best results. Use 15 cm wide cloth either square or rectangular (15×20 cm). Micromesh clothes can be ordered from JAAP Enterprise.

Users by conservators and research labs in Europe, the USA and Australia:

UK: National Gallery London; Courtauld Institute of Art London; Art Access and Research London.
NL: Rijksmuseum Amsterdam; Mauritshuis The Hague; Frans Hals Museum Haarlem; Rijksdienst Cultureel Erfgoed Amsterdam; several private conservators.
D: Doerner Institute Munich; Bayerisches Landesamt fur Denkmahl Plege Munich; Technische Universitaet Munich
DK: SMK Kopenhagen
N: IAKH Conservation Oslo
B: KIK-IRPA Brussels
CH: SIK-ISEA Zurich; HKB Bern
P: Universidade Nuova Lisboa Lisbon
USA: National Gallery of Art Washington; Metropolitan Museum New York; MOMA New York; Art Institute of Chicago; Library of Congress Washington; University of Brooklyn New York; NU-ACCESS Chicago
Australia: University of Technology Sydney

Publications: