Properties; General; Warranty; Physical Properties Of The Glass-Ceramic Material - SI Analytics SLK 1 Manual De Instrucciones

1 Properties

General

The laboratory hot plates with glass-ceramic heating surface are used primarily to heat up aqueous
solutions not containing any inflammable components in glass vessels. As the interior of the laboratory hot
plates and the glass-ceramic heating surface become hot, all other applications should be checked
carefully to establish whether they could give rise to hazardous situations.
The glass-ceramic material of the SI Analytics laboratory hot plates has special thermal properties. The
glass-ceramic heating surface is virtually free of thermal expansion and can withstand temperature
fluctuations from - 200 ° C to + 700 °C. Ice-cold water can be poured over a hot glass-ceramic heating
surface without causing any damage.
Besides its thermal properties, the glass-ceramic material also has the chemical stability and surface
quality of glass. Owing to its high infrared permeability, heat energy is transmitted quickly with only little
loss. The residual-heat indicator of the laboratory hot plates warns of burning hazards. The residual heat
can be used in an energy-saving manner to pre-heat another vessel.
The glass-ceramic surfaces remain level, are pore-free and do not have any restricting frames or corners
where dirt could accumulate. The laboratory hot plates of SI Analytics are therefore easy to clean.
The back panel of the laboratory hot plates contains a borehole with an M8 thread to take a 10 mm ∅ ∅ ∅ ∅
tripod rod (not included in the scope of supply, Order No. Z 601).
The functions of the laboratory hot plates are controlled by sensor keys.
Limitations on use are described in the chapter "Warning and safety instructions".

Warranty

We hereby guarantee the designated piece of equipment against any manufacturing defects arising within
two years from the date of purchase. The warranty covers restoration of functionality, but no further claims
to compensation.
In case of improper use or unauthorised opening of the device, the warranty will be rendered invalid. Parts
subject to wear, such as for example the radiant heater elements, are excluded from the warranty, as are
breakage of the glass-ceramic plate and corrosion damage resulting from improper use in an aggressive
atmosphere.
To establish obligations under the guarantee, we kindly request you to send the equipment to us carriage
or postage-free together with the sales receipt showing the date of purchase.

Physical properties of the glass-ceramic material

Coefficient of thermal expansion :
Density ρ:
Module of elasticity E:
Knoop hardness under 1N load:
Maximum temperature stability: Tmax permanent:
Static load capacity: surface load:

Chemical properties of the glass-ceramic material

Hydrolytic resistance DIN ISO 719:
Alcali resistance
Acid resistance
The SLK 1 and SLK 2 laboratory hot plates including their radiant heater elements in the respective
heating zone are suitable for quickly heating up liquids. The highest heat intensity, i.e. << 9 >>,
corresponds to a heating output of 1.2 kW or 1.8 kW, respectively.
An over-temperature protection facility prevents the laboratory hot plates from overheating.
DIN 52 322 / ISO 685:
DIN 12 116:
13
+ 20 ... + 300 ° C: - 0.25
+ 20 ... + 700 ° C: + 0.10
3
2.58 g / cm
2
92 kN / mm
> 575 HK (test according to ISO 9385)
700 ° C; temporary (max. 1 min.): ≤ 850 ° C
0.1 kp / cm2 (approx. 1 N / cm2)
Hydrolytic class 1
Class 2
Class 3
-6 1
10 K-
10 - K -
6 1