B-Time determination on the
B-Timing Plate provides information on the curing
behavior of resins capable of heat-hardening, namely the
reaction time at a given temperature after which resins
(solid, liquid, or solvent-containing resins of a known
concentration) change to the B-state. This B-Timing
Plate according to DIN 16 916 is mainly used for
Phenolic resins.
Our standard
B-Timing Plate has four depressions in the heating
plate, accepting one sample each. Plates without
depressions are also available. The temperature is
precisely controlled with our temperature controller
TC-3.
GEL TIME DETERMINATION OF POWDER
COATINGS
According to DIN 55 990, the gel time of powder coatings
is the time required to melt a specimen at a laid down
temperature, using a specific test apparatus, and to
achieve a gel - like consistency.
For the
determination of the gel time of powder coatings, our
Heating Block PL in accordance with the German Standard
DIN 55 990 (ref. 30.45) with a spherical depression
(mould) is used.
The
temperature is precisely controlled with our temperature
controller TC-3.
The automatic GELNORM®-Gel Timer TC for the measurement of gelation time under standardised
conditions is easy to use and the results show exceptionally good reproduceability with all reaction resins
such as:
unsat. Polyester resins Epoxid
resins
Polyurethane resins
Acrylic resins
Silicone resins etc.
The instrument incorporates a switch-off mechanism that responds to pressure: the gelation time limit is
reached when the measuring stamper meets a defined reaction force in the reaction resin. As a result of
this automatic switch-off system, the size of resin sample employed is not limited. The disposable
stamper of stainless steel wire carries out a defined reciprocating movement as soon as the instrument is
set in operation and, when the change in viscosity is reached, a built in timer is stopped and the gelation
time can be read off.
GELNORM® - DE is a novel measuring instrument for establishing the curing reaction of two-component
reaction resin systems (thermoset resins). The new instrument is based on the determination of a function
of electical conductivity as well as the capacitance of a resin sample. This electrical function enables to
trace the curing process over the whole regime of the chemical reaction.
The electric function as determined with GELNORM - DE is inversely proportional to the viscosity of a
polymer sample. Hence, the instrument provides new possibilities to investigate the curing reaction of
reaction resins such as:
With GELNORM - Gel Timer it is
possible to evaluate all factors which influence the gel
time of reaction resins such as type and quantity of
hardener, accelerator, inhibitor, filler, pigments, as
well as temperature and moisture. The instrument is
extremely easy to operate and normally needs no
maintenance.
The principle
of measurement of GELNORM - Gel Timer is simple: A
stamper made from aluminium or glas performs an up-down
cycle in a thermostatized test tube filled with resin.
When the point of gelation is reached, the test tube is
pulled up by the stamper. This stops the clock which was
started at the beginning of the experiment and the gel
time can be read of.
GELNORM® - MED is a measuring
instrument for the hard setting sequence of two
component systems, which either have a high initial
viscosity or in which the viscosity rises to very high
values during the hard setting process. The instrument
is also suitable for systems that have a filler type
starting viscosity: the viscosity of such systems cannot
be measured with conventional rotational viscometers.
GELNORM® - RVN is an instrument
for the automatic determination of the pot life of
reaction resins based on the measurement of the relative
viscosity. Applications include:
Unsaturated polyster resins
Silicone resins
Epoxy resins
Polysulfide rubbers
Polyurethane resins
Silicone rubbers
Acrylate resins
GELNORM - RVN can be used for
structurally viscous, thixotropic and very slow
hardening reaction resins. Highly filled systems such as
primers and fillers can be tested with this instrument
as well as adhesives.
