ELASTOSIL® RT 724
ELASTOSIL® RT 724 is a pasty, thixotropic, addition-curing, 2-part silicone rubber that cures to a soft silicone rubber either by UV-light exposure or heat exposure when mixed with the platinum catalyst part ELASTOSIL® CAT UV or ELASTOSIL® CAT PT.
• 10:1 mixing ratio
• Pasty, thixotropic
• Easy dispensing
• Compatible with addition curing silicones
• Room temp curing with ELASTOSIL® CAT PT
• Fast curing with ELASTOSIL® CAT UV after UV-light activation
• Good bonding to glass, PA6 or PBT
Silicone rubber dam material for optical bonding of displays.
ELASTOSIL® RT 724 is fully compatible with platinum curing WACKER SilGel® and can be even cured wet-in-wet.
All surfaces must be clean and free of contaminants that will inhibit the cure ELASTOSIL® RT 724.
Examples of inhibiting contaminants are sulfur contain-ing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds.
ELASTOSIL® RT 724 contains the crosslinker, ELASTOSIL® CAT PT or CAT UV contains the platinum catalyst.
The two components should be thoroughly mixed at a 10 : 1 ratio by weight or volume by means of a static mixer.
The system ELASTOSIL® RT 724 / ELASTOSIL® CAT UV (10:1) is activated by direct UV irradiation.
We recommend to use a mecury bulb (e.g. Fe-beam) emitting UV-light of 250-350 nm, preferred 280-320 nm (UV-B).
UV-C light below 250 nm should be excluded, e.g. by means of Quartz filter glas.
Typical UV-light intensity used is 150-200 mW/cm2, typical UV-light dose for curing is 1.5-3 J/cm2
Typical UV-light exposure is 150 mW/cm2 intensity for 20 sec, resulting in a UV-light dose of 3 J/cm2.
Less UV-light dose will increase curing time, higher UV-light dose will shorten curing time.
Maximum dam height for the UV-activation is limited to 2-3 mm depending on the UV-light bulb used.
The system ELASTOSIL® RT 724 / ELASTOSIL® CAT PT (10:1) is cured thermally.
For fast cure, we recommend to use a vented oven or the like.
ELASTOSIL® RT 724 should be stored dry and cool in the tightly closed original container.
The 'Best use before end' date of each batch appears on the product label.
Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.