Sample Preparation

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Grinding Papers for HK-Sample Preparation Machines

For spectrometer sample preparation on disc grinders - mainly steel- and Ni-base materials - grinding papers of corundum, silicon carbide and zirconium oxide are used.

The most common and economic grinding papers are corundum papers.

SiC-papers are generally superior in grinding performance, however they are more expensive than corundum papers and should not be used for softer materials like pure iron because of C and Si contamination.

Zirconium oxide papers are preferred by many users because of their longer life time and because Zr is uncritical in most applications. They are a bit more expensive than the others.

Grinding papers furthermore differ in paper backing, but the main difference is grit size. A grit 40-paper is mostly used for pre-grinding, grit 60 is the standard grit size and grit 80 is used only for finer grinding and special application. The selection of suitable grinding papers depends on the material type to be grinded and also on the analysis to be done, e.g. optimum surface preparation for N-determination by OES-spark spectrometers.

We offer:

Disc grinder HK200
dry seal (self adhesive) grinding papers, ě 200mm
HK-PAP200K/40 corundum paper, grit 40
HK-PAP200K/60 corundum paper, grit 60
HK-PAP200K/80 corundum paper, grit 80
HK-PAP200Z/40 zirconium oxide, grit 40
HK-PAP200Z/60 zirconium oxide, grit 60
HK-PAP200/S silicon carbide papers on request
Disc grinder HK350
grinding papers with centre hole, ě 350mm
HK-PAP350K/40 corundum paper, grit 40
HK-PAP350K/60 corundum paper, grit 60
HK-PAP350Z/40 zirconium oxide, grit 40
HK-PAP350Z/60 zirconium oxide, grit 60
HK-PAP350S/.. silicon carbide papers on request

Cup stones for HK150 and HK150EXS pendulum grinders

Cup stones are characterized by material type, grain size, hardness and structure. The materials are mainly corundum and silicon carbide. The grain size primarily determines the cutting performance and thus the surface condition of the sample. A grain size of 30-60 is considered to be medium grain size. The hardness indicates how solid a grain is bonded in the stone. This is expressed by letters ranging from D = very soft to T = very hard. The structure of a stone describes the distance of the grains among each other and is labelled from 0 = very narrow up to 14 = very open.

Hard materials, e.g. white structured cast iron for spectrometric analysis, is grinded with open, soft stones. Those stones have a relatively higher consumption, but because of more grain loss they have a good grinding performance on hard materials with a relatively low heat development, avoiding so called 'blue grinding'. The choice of a suitable grinding stone depends on the material/sample type, the optimal stone for a certain material quality can only be determined empirically. For different material applications we offer universal high grade pink corundum stones, article no. HK-T46J or HK-T32J - medium grain size, open stones suitable for hard materials, too.

Silicon carbide stones of medium hardness have prolonged life time, but they tend to 'blue grinding', because of less heat transportation, which results in loss of carbon on the sample surface. The use of such stones requires very careful grinding practices. Sample preparation of pure irons, zero samples, should never be made by silicon carbide stones because of contamination of C and Si. However, on request we can also offer such a stone, under art.-no. HK-T49M.