ISO-PUR® K7065
Compressible casting resin for rail casting
ISO-PUR® K7065
ISO-PUR® K7065 is a mineral-filled, cold-curing 2-component polyurethane casting resin based on polyether and polyester polyols cured with polymeric aromatic diisocyanates. By mixing the components, a cross-linked, permanently elastic plastic material is formed. The elastic properties of the material garantee good vibration damping of components that are subject to corresponding mechanical loads, e.g. for the casting of track systems or rails, or their supports. ISO-PUR® K7065 is equipped with special fillers that give the material compressible properties even when embedded. The material is hydrophobic and electrically insulating in both its liquid and cured state. ISO-PUR® K7065 does not contain any plasticisers and does not tend to become brittle. The material has excellent hydrolysis resistance. The system is characterised by very little shrinkage during curing. The mass has good corrosion protection properties. Due to the high proportion of natural materials, ISO-PUR® K7065 can be considered environmentally friendly and sustainable. The pro-duct is RoHS compliant according to EU Directives 2011/65/EU (“RoHS”) and 2015/863/EU (“RoHS III”).
Area of application
Especially suitable for the casting of rails.
Technical data
Resin
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Grey black
Approx. 10000 mPas
Approx. 5000 mPas
Approx. 1,10 g/cm³
Hardener
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23°C)
Braun
Approx. 130 mPas
Approx. 120 mPas
Approx. 1,23 g/cm³
Mixture
Mixing ratio resin : hardener
8 : 1 parts by weight
Colour
Grey black
(other colours on request)
Density (23oC)
Approx. 1,13 g/cm³
Pot life (23°C) /
Gel time (23°C)
Approx. 10 min
Approx. 20 min
Mixed viscosity (25°C; rot.; 1 s-1)
Approx. 7500 mPas
Mixed viscosity (25°C; rot.; 10 s-1)
Approx. 4000 mPas
Cured product
Under standard curing condition
(14 days 23°C / 50% relative humidity) unless otherwise stated
Hardness Shore A
(23°C; 14d RT 50% rel. h.) /
Hardness Shore A
(23°C; oven curing: 4hRT + 24h80°C)
Approx. 67
Approx. 67
Hardness Shore D
(23°C; 14d RT 50% rel. h.) /
Hardness Shore D
(23°C; oven curing: 4hRT + 24h80°C)
Approx. 15
Approx. 15
Glass transition temperature (midset)
Approx. -28°C
Tensile strength (5A specimen)
(2 mm thickness; speed: 10 mm/min; 23°C)
Approx. 1,70 N/mm2
Elongation at break (5A specimen)
(2 mm thickness; speed: 10 mm/min; 23°C)
Approx. 55%
Tear resistance
(W-specimen; incision; speed: 10 mm/min; 23°C)
Approx. 2,20 N/mm
Water absorption after 28 days
in water (immersion; 23°C)
Approx. 5,40%
Water vapour permeability
(75% relative humidity; 23°C; 1 mm thickness)
Approx. 5,10 ×10-6 g/(day×mm2)
Spring index / statistical stiffness (DIN 45673-8)
Approx. 110 (kN/mm)/m
Storage and transport
Store containers in a dry and airtight container at 10 – 35°C. Can be kept for at least 12 months in originally sealed containers under the conditions mentioned. Short-term deviations during transport and storage are acceptable.
Cleaning
To ensure good adhesion of the cast resin the cus-tomer should individually test the suitability of the involved surfaces. Possible pre-treatments like cleaning, activation processes etc. should be also taken into account. The contact surfaces should be free of dirt such as dust, grease or water.
Processing
Stir up the resin container thoroughly before use to remove any possible sedimentation. Weigh the resin and hardener in the desired mixing ratio and mix for 1 – 3 minutes (depending on mixed quantity and processing time). Apply suitable mixing speed in order to ensure complete homogeneous mixing without introducing too many air bubbles into the reaction mass. The ideal processing temperature is 20 – 25°C. In general, curing is delayed at lower temperatures and accelerated at higher temperatures. Before casting, a homogeneous mass, free of streaks, must be obtained. Then pour immediately and do not scrape the mixing vessel. Air bubbles in the reaction mass can be removed before the end of the potlife by evacuating the material or carefully fanning the surface with a hot air gun. The material is particularly suitable for machine casting.
The EC safety data sheet provides information on safety-relevant product properties.
Hardener component (containing diisocyanate): As of August 24, 2023, appropriate training must be provided before industrial or commercial use.