Retsch PP 25 - Manual (Page 17)

Operating the machine
17
Usually 20% wax is mixed in with the sample material. The mixing ratio here is 1
part wax and 4 parts sample material.
Essentially, this improves the durability and surface of the pellets for the
subsequent XRF analysis.
We recommend the Retsch MM400 for producing a homogeneous mixture of
sample material and the wax. Use a plastic beaker made of polystyrenefor mixing
(Art. no. 22.041.0003) and 4 grinding balls made of polyamide (Art. no.
05.368.0042).
The following parameters are recommended for the MM400 to ensure mixing
instead of grinding.
• Time = 2.00 min
• Frequency = 15 Hz
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5.4 Instructions on Handling the Die Tool and the Pressing Plates
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NOTE
Sample residue clinging to the die tool can be very corrosive depending on the
material and composition (e.g. salt residue) and cause irreparable damage to the
die tool. Please therefore clean the entire die tool thoroughly with water and then
with alcohol.
Store the die tool and its individual parts in as dry a place as possible until they are
used again.
Never scratch the pressing plates with a sharp object. You can remove hardened
sample residue with blotting paper or filter paper.
To protect the pressing plates, put them into the supplied boxes after cleaning.
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5.5 Operating the Die Tool
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5.5.1 Preparing the die tool
NOTE
Before using the die tool parts for the first time, please clean them with an organic
detergent in order to remove any oil residue.
• Remove every bit of dirt from the die tool.
Fig. 4: Inserting the slide
• • Push the slide (S) into the basic body of the die tool (P). The
ventilation or evacuation boreholes (SB) should point upwards during this
procedure.
S
P
SB