ISO-PUR® K2000
Universal filled PUR casting resin for cable accessories up to 10 kV.
Training required
Cable assembly cast with certified 1 kV casting resin ISO-PUR® K2000
ISO-PUR® K2000 is a mineral-filled, cold-curing 2-component polyurethane-based casting resin, especially for potting low-voltage cast resin cable joints. The hydrophobic resin is based on poly-ether polyols, ester polyols and non-combustible minerals. The hardener consists of aromatic polyisocyanates (pMDI type) that exhibit very low vapour pressure. ISO-PUR® K2000 is free of halogens and plasticisers. Cured castings comply with the norm VDE 0291 part 2 draft 6/97 for viscoplastic moulding materials (RLS-W type). Mouldings made of ISO-PUR® K2000 do not tend to become brittle. The compound has good corrosion protection properties and high adhesion to metal, ceramics and many plastics (PVC, PE, XLPE). ISO-PUR® K2000 is used in cast resin cable joints up to 10 kV. The product is RoHS compliant according to EU Directives 2011/65/EU (“RoHS”) and 2015/863/EU (“RoHS III”).
Technical data
Resin
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density (23oC)
Beige
Approx. 5200 mPas
Approx. 3000 mPas
Approx. 1,45 g/cm³
Hardener
Colour
Viscosity (25°C; rot.; 1 s-1)
Viscosity (25°C; rot.; 10 s-1)
Density(23oC)
Brown
Approx. 130 mPas
Approx. 120 mPas
Approx. 1,23 g/cm³
Mixture
Mixing ratio resin : hardener
Colour
4,5:1 parts by weight
Beige (other colours on request)
Density (23oC)
Approx. 1,39 g/cm³
Pot life (23°C)
Gel time (23°C)
Approx. 10 min
Approx. 15 min
Mixed viscosity (25°C; rot.; 1 s-1)
Mixed viscosity (25°C; rot.; 10 s-1)
Approx. 1800 mPas
Approx. 1500 mPas
Dielectric strength
Approx. 7 kV/mm
Maximum curing temperature (300 ml)
Approx. 75°C after 18 min
CO2 separation
During curing under the influence of water
< 10 ml
Cured product
Mixing ratio resin : hardener
Under standard curing conditions
4,5 : 1 parts by weight
(14 days 23°C / 50% rel. humidity) unless otherwise stated
Code letter (VDE 0291 E 6/97)
L-R-W
Physical structure
Bubble-free, homogeneous
Hardness Shore D
(23°C; 14d RT 50% rel. h.)
Hardness Shore D
(23°C; oven curing: 4hRT + 24h80°C)
Approx. 50
Approx. 55
Long-term temperature resistance
Short-term temperature resistance
Approx. 130°C
Approx. 180°C
Glass transition temperature (midset)
Approx. 12°C
Tensile strength (5A specimen)
(2 mm thickness; speed: 10 mm/min; 23°C)
Elongation at break (5A specimen)
(2 mm thickness; speed: 10 mm/min; 23°C)
Approx. 7,50 N/mm2
Approx. 100%
Tear resistance
(W-specimen; incision; speed: 10 mm/min; 23°C)
Approx. 11 N/mm
Dielectric strength (VDE 0291 T 2)
Approx. 20 kV/mm
Hydrolysis resistance test (VDE 0291 E 6/97)
Passed
Water absorption
After 28 days in water (immersion; 23°C)
Approx. 0,80%
Water vapour permeability
(75% relative humidity; 23°C; 1 mm thickness)
Approx. 6,00×10-7 g/(day×mm2)
Storage and transport
Store in a dry and airtight, closed container at 10 – 35°C. Can be stored for at least 12 months in original sealed containers under the above conditions. Short-term deviations during transport and storage are acceptable.
Cleaning
To ensure good adhesion of the cast resin the customer should individually test the suitability of the involved surfaces. Possible pre-treatments like cleaning, activation processes (plasma process) etc. should also be taken into account. The contact surfaces should be free of dirt such as dust, grease or water. For cleaning we recommend ISO-RC® Degreaser for wipe degreasing or ISO-RC® Flux-Off + ISO-RC® Spraywash for spray degreasing (available in 400 ml spray cans).
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. When using a double chamber bag, empty the corners thoroughly and knead for 3 minutes. Before casting, a homogeneous mass, free of streaks, must be obtained. Pour immediately afterwards and do not scrape the mixing vessel. Air bubbles that have been stirred in, can be removed before the end of the potlife by evacuating the material or carefully fanning the surface with a hot air gun. Machine casting is also possible.
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.