K90100/K90190 Auto Melting Point Unit
Operation and Technical Manual
Page 15
Koehler Instrument Company, Inc.
1595 Sycamore Avenue • Bohemia, New York 11716-1796 • USA
Toll Free: 1-800-878-
9070 (US only) • Tel: +1 631 589 3800 • Fax: +1 631 589 3815
http://www.koehlerinstrument.com • e-mail: [email protected]
Petroleum Testing & Analysis Instrumentation • Custom Design & Manufacturing
4.4 Sample Preparation
The sample is prepared using the following items: clear glass slide, clear round cover
slip, sample preparation jig (0.5 mm thick, 5 mm hole dia), small spatula, finely crushed
sample powder (about 5 mg / sample). Place the jig on one side of the glass slide and
finely spread the powder with the help of the spatula. (Do not stack the sample.) Place the
round cover slip on it. Observe that the sample is homogeneously spread in a well-defined
circle (avoid gaps). Note: Place a round cover slip on the furnace lid. In between the runs,
the furnace lid should be sufficiently cooled.
Useful HINTS :
1. For sample whose melting point is not known, use heating rate : 6 or 12 °C/MIN.
2. For plastics / fibers, use heating rate : 12 °C/MIN.
3.
For ‘Heat & Cool’ Mode, it is recommended to use 1°C/MIN.
4.
It is recommended to use ‘MANUAL’ operation for dark colored samples.
5. For samples, that shrink or become transparent during heating process, increase
sample size and use heating rates: 3, 6 or 12 °C/MIN.
SAMPLE SLIDE
MICRO
–SLIDE
1 MM THICK
22 DIA.
COVER
SLIP
SAMPLE
POWDER
