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1 GELNORM Geltimer GELNORM - Geltimer is an instrument for the automatic determination of the gel time of reaction resins. The design is based on DIN , DIN and EN The test with GELNORM - Geltimer is very easy to perform and gives exceptionally good reproducibility. The automatically measurement can be performed for any reaction resin, for example: Unsaturated polyester resins Epoxy resins Polyurethane resins Acrylic resins Silicone resins With GELNORM Geltimer 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 Geltimer is simple: A stamper made from aluminium or glass 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. DESCRIPTION OF INSTRUMENT GELNORM - Geltimer consists of a control unit and individual test units. The following types are available: Gel - Timer with one test unit (Ref ) Gel - Timer with up to three test units (Ref ) 1 Friction clamp 2 Machine screw 3 Measurement stamper 4 Micro switch 5 Foam ring 6 Test tube 7 Test tube holder 8 Sampler mixture January 2013 / Geltimer_db_e page 1 / 6

2 According to DIN , stampers (Ref ) made of aluminium wire with a coiled head are used. This design provides the same gel time measurement as the glass stamper specified in the specification of DIN but is more economical. The design of the aluminium stamper moreover provides a minimum of surface area, which leads to minimized air inhibition which is especially important for unsaturated polyesters. It is also possible to use a glass stamper (Ø 3 mm, length 230 mm with fused base) according to DIN (Please notice that another stamper attachment clamp (Ref ) is used in this case.) Test tubes are of 160 x Ø 16 mm with lip (Ref ). Time Measurement and Measuring Cycles The control units are provided with digital LCD clock-modules. The automatic digital time measurement gives a reading of 1 second for test durations up to 24 hours. By starting a new measurement the clock is automatically reset to zero. The continuous up-down motion cycle of the stamper is set to 10 seconds as our standard. For individual needs, test units with other motion cycles are available upon request Temperature Measurement A GELNORM Thermbox l lll can be connected to the control unit. The gel time as well as the change of temperature inside the probe can be recorded with the software. The Thermbox l is for 1 Test unit, the Thermbox lll is for 3 Test units. The communication is over USB. Geltime time to reach the gel point after DIN T max maximal temperature t(t max ) time from start to the maximal temperature point Thermbox l Thermbox lll Print Screens from the Software of GELNORM Thermbox The stored data s can be used with excel January 2013 / Geltimer_db_e page 2 / 6

3 Thermostatic bath For good result with a thermostatic bath you should have a repeatable accuracy of the temperature. Thermostatic Bath with silicon-oil, 30 C 150 C It is possible to perform tests at defined temperatures by submersing the portion of the test tube with the reaction resin into a thermostatic bath. The amount of the liquid in the bath should be adjusted such that its level is about 1 cm higher than the level of the reaction resin in the test tube. (Please note, that the volume excluded by the test tube influences the experiment and, hence, it has to be constant in order to reach an optimal reproducibility of the results.) The method is recommended for temperatures from 30 to 140 C. Two different thermostatic baths are available for one (Ref ) and three test units (Ref ). Special supports for the test units enable measuring in a closed thermostatic bath. Electric Heating Block GT with Temperature Controller TC4, 50 C 200 C At temperatures of 50 up to 200 C our Electric Heating Block GT (Ref ) can be used. Temperature control of the heating block is performed with the temperature controller (70.06). Max temperature limiter in the heater Sensor over watching function and Alarm TECHNICAL DATA Actual - intended (Pt100): - range: , 0 C - accuracy: ± 0, 3% (of the scale range ± 1 digit) Intended value: - range: , 0 C - resolution: 0, 1 K - accuracy: ± 0, 3 K Supply voltage: VAC, 50/60 Hz Load output Power max. - Resistive: 1200 W - inductive: 150 W January 2013 / Geltimer_db_e page 3 / 6

4 TEST PROCEDURE Preparing the test mixture Weigh 100 g of reaction resin (deviation of 1 % permitted according to DIN ) in a beaker. Weigh hardener and accelerator according to instructions, accurate to 0, 01 g. After mixing well for approx. 1 minute, place the sample mixture in a test tube (160 x Ø 16 mm, net weight approx. 10 g) up to a height of abt. 70 mm (weight of resin approx. 12 g). Test tube and resin mixture should have a total weight of 22 g. To obtain exact and reproducible results, it is essential to pay attention to the total weight. The time between completion of mixing the sample and starting the test should be less than one minute. Performing the test Place the test tube (including support spring) with the sample into the support of the test unit. Attach the support spring to the micro switch. Press the start button on the control unit. The button cannot be activated until the sample is attached to the micro switch. After having pressed the start button, the clock is started. Insert the stamper into the sample and attach to the clamp. When the gel point is reached, the stamper remains in the sample; the drive motion lifts the test tube and, via the micro switch, stops the clock. For the simultaneous determination of the maximum temperature T max the GELNORM -Therm-Box with an attached Ni-Cr-Ni-thermopile is connected to the control unit. The thermopile is inserted into the reaction resin together with the stamper at the beginning of the test. Test tube and stamper are thrown away after the test. There is no cleaning necessary. Test unit with optical sensor: Place the test tube (including cover plate, see Page 5) with the sample and stamper into the test unit, press the start button on the control unit and fix the stamper into the clamp by tightening the screw. Upon reaching the gel point, the stamper can no longer retract from the sample, the test tube is lifted with the up-ward motion of the stamper and the clock is stopped via the signal created by the micro switch or the optical sensor. Test units with optical sensor allow for adjustment of the switch-off level (i.e. the level to which the test tube has to be elevated to stop the test). The standard setting is ca. 6 mm. For the simultaneous determination of gel time, maximum temperature T max, and t(t max ), the GELNORM - Therm-Box with an attached Ni-Cr-Ni-thermocouple is connected to the control unit. The thermocouple is inserted into the reaction resin together with the stamper at the beginning of the test. The data collected with GELNORM - Therm-Box 1-3 are transferred to a computer and can be displayed and archived with the provided software January 2013 / Geltimer_db_e page 4 / 6

5 1 Main power supply 2 2 Clock 3 Power control lamp 3 4 Start button 4 5 Clamp 6 Stamper 7 Opto - Switch 8 Limiter 11 9 Test tube 160 x Ø 16 mm 10 Resin sample Supply cable 12 Connection for test unit 13 Connections GELNORM Therm-Box 1 or 3 14 Fuse 500 ma Technical Data Test Unit Geltimer Time 99h 59min 59s Accuracy, 1 sec Cycle 10 sec Other cycle is possible on request Dimension, 130 mm, H = 361 mm Weight, 2.5 kg Material, Aluminium eloxiert Environment, -30 C 50 C Power, 230 VAC oder115 VAC from, ST1 / ST3 Thermbox l (160.81) or lll ( ) Temperature and geltime measuring GELNORM Thermbox l or lll Thermocouple Ni-Cr-Ni, 5m, incl. Software and USB cable Controller for Test Units1-3: 1 with ST/1 / 3 with ST/3: Weight Controller ST/1 with Test Unit: 4.6 kg Controller ST/3 with 3 Test Units: 9.6 Kg Weight Test Unit: 2.5 kg Technical changes without prior notification. Images and weight may deviate slightly from the original. January 2013 / Geltimer_db_e page 5 / 6

6 CODE, ITEM NUMBER GELNORM - Geltimer, complete test unit for 1 channel pcs. control unit ST/1 (20.15) 1 pcs. test unit (20.17) mechanical switch 100 pcs. stampers (20.30) GELNORM - Geltimer, complete test unit for 1 channel pcs. control unit ST/1 (20.15) 1 pcs. test unit (20.18) optical switch 100 pcs. stampers (20.30) Options for the 1 channel system GELNORM - Thermbox l, incl. software Thermostatic Bath for 1 test unit With Holder for the glass tube and cover for thermostatic bath 20.51H Thermo block GT at 200 C, 230 VAC or 115 VAC Temperature Controller TC-4, C, VAC GELNORM - Geltimer, 3 test units: pcs. control unit ST/3 (20.14), 3 pcs. test units (20.17) mechanical switch, 100 pcs. stampers (20.30), GELNORM - Geltimer, 3 test units: pcs. control unit ST/3 (20.14), 3 pcs. test units (20.18) optical switch, 100 pcs. stampers (20.30), Options for the 3 channel system GELNORM - Thermbox lll, incl. software Thermostatic Bath for 3 test units With 3 Holders for the glass tube and 1 cover for thermostatic bath 20.53H 3 x Thermo block GT at 200 C, 230 VAC or 115 VAC x Temperature Controller TC-4, C, VAC Accessories for both GELNORM - Geltimers 1 and 3 channel Package of stampers for measuring the gel time (alu), 500 pcs. L = 235 mm Package of stampers for measuring the gel time (steel), 500 pcs, l = 235 mm Package of test tubes 16 x 160 mm, 100 pcs Support Springs, 4 pcs Clamps for Alustamper, 3 pcs Accessories for the Thermbox l and lll Thermocouple NiCr-Ni, 5 m January 2013 / Geltimer_db_e page 6 / 6