Product Overview

MC-Dur Elastic is the elastomeric variant in the MC-Bauchemie MC-Dur facade protection coating range — occupying the specific performance niche between rigid acrylic anti-carbonation coatings (such as MC-Dur 1200) and full exterior wall sealant systems, by combining the CO2 diffusion resistance of an anti-carbonation coating with the crack-bridging elasticity of an elastomeric membrane coating. The fundamental technical distinction between MC-Dur Elastic and a standard rigid anti-carbonation coating (MC-Dur 1200 or similar) is elongation at break: a rigid acrylic anti-carbonation coating has elongation at break of 30 to 100 percent and will crack when applied over a substrate hairline crack that subsequently opens further from thermal or structural movement; MC-Dur Elastic has elongation at break of 150 to 300 percent (depending on dry film thickness and temperature), which allows it to bridge hairline cracks of 0.3 to 0.5 mm width at ambient temperature without the coating film tearing open. This crack-bridging performance is essential for the concrete facades of the vast majority of Indian residential and commercial buildings that are 10 to 30 years old — virtually all of which have developed hairline thermal cracks and surface crazing from the large diurnal and seasonal temperature cycles of the Indian climate (temperature range from 5 degrees Celsius in North Indian winter to 45 to 48 degrees Celsius in summer — a 40 to 43 degree Celsius annual swing that generates significant cyclic thermal strain in concrete elements). These hairline cracks (typically 0.05 to 0.3 mm width) do not affect the structural integrity of the building but provide direct ingress paths for CO2 and water to the reinforcement, accelerating carbonation and corrosion. MC-Dur Elastic seals these cracks and provides a continuous CO2 and water barrier across the entire facade surface. Space Arc Engineering supplies MC-Dur Elastic for building renovation contractors, facade waterproofing applicators, property maintenance companies, and housing society maintenance engineers in Ghaziabad, Delhi NCR, Noida, and Uttar Pradesh.

Applications

• Concrete facade protection and renovation of residential apartment buildings and housing societies — application of MC-Dur Elastic to the external reinforced concrete and plastered concrete surfaces of residential apartment towers, housing society blocks, and multi-storey residential buildings in Delhi NCR, Noida, Greater Noida, Ghaziabad, and Uttar Pradesh that show: hairline thermal cracking and surface crazing; carbonation-induced reinforcement corrosion evidenced by rust staining or concrete spalling at reinforcement cover; surface erosion and deterioration of the original paint or texture coat; the complete facade renovation system using MC-Dur Elastic typically consists of surface preparation (Karcher pressure washing, grinding of loose paint and carbonated surface layer), substrate repair of spalls and cracks (MC-Nafufill N or MC-RocTec 45), primer coat (MC-Dur sealer or acrylic primer), and two to three coats of MC-Dur Elastic to achieve the 200 to 300 micrometre DFT required for crack-bridging and CO2 barrier performance
• Carbonation protection coating for commercial and institutional buildings — application to the concrete facades of commercial office buildings, shopping malls, industrial buildings, hospitals, schools, and government buildings with exposed or painted reinforced concrete facades where ongoing carbonation and corrosion of reinforcement is causing facade deterioration; the investment in MC-Dur Elastic as a preventive or early-intervention coating is significantly more cost-effective than waiting for corrosion to advance to the spalling stage and then executing expensive structural concrete repair and re-coating
• Bridge abutment and pier face anti-carbonation coating in urban environments — application to the vertical and soffit faces of reinforced concrete bridge abutments, wing walls, and pier caps on road and rail bridges in high-traffic urban environments where vehicle exhaust CO2 concentrations are elevated (CO2 levels in congested urban traffic can reach 0.1 to 0.5 percent by volume — 3 to 15 times the average atmospheric level of 0.03 to 0.04 percent) and carbonation rates in unprotected concrete are correspondingly accelerated; MC-Dur Elastic provides the long-term CO2 diffusion barrier required in these high-exposure locations and the crack-bridging capability to accommodate the small-amplitude vibration-induced microcracking in bridge elements without coating film rupture
• Renovation of water storage tanks, overhead tanks, and service reservoir walls — the exterior surface of reinforced concrete water tanks and service reservoirs is an important application for MC-Dur Elastic: the interior is kept full of water (maintaining high internal humidity), the exterior is exposed to the weather with no protection in most existing tanks, and the high internal humidity combined with the exterior-to-interior RH gradient creates conditions that accelerate carbonation on the dry exterior face; the elastomeric coating accommodates the thermal movement in tank walls (which cycle from full to empty — a temperature and load change) without cracking

Key Advantages

• Crack-bridging capability to 0.3 to 0.5 mm at ambient temperature — bridges static and dynamic hairline cracks present in the concrete or plaster substrate without the coating film cracking open at the crack location; at the elongation at break of 150 to 300 percent, the elastomeric film can accommodate the crack width variations caused by daily and seasonal thermal cycling without fatigue failure — the most important performance distinction of MC-Dur Elastic versus a rigid anti-carbonation coating for Indian building facades that invariably have thermal hairline cracks
• High CO2 diffusion resistance (SD value) for long-term carbonation protection — MC-Dur Elastic at the recommended dry film thickness (200 to 300 micrometres total in 2 to 3 coats) provides an equivalent air layer thickness (SD value) to CO2 diffusion equivalent to several metres of air — providing the same CO2 diffusion resistance as 20 to 50 mm of dense concrete; this CO2 barrier function retards the carbonation front advance in the existing concrete below the coating, protecting reinforcement in cover zones that have already lost alkalinity or have a low residual carbonation margin
• Excellent water vapour permeability (breathable coating) — despite its high CO2 and water diffusion resistance, MC-Dur Elastic maintains adequate water vapour permeability (SD value to water vapour below 2 metres per EN ISO 7783) allowing the concrete substrate to breathe and internal moisture vapour to escape through the coating without causing blistering; a non-breathable coating applied to moist concrete substrate (common in Indian conditions after monsoon) would blister and delaminate — the breathability of MC-Dur Elastic prevents blistering even when applied in moderate humidity conditions
• UV stability and exterior weather resistance for Indian climate conditions — MC-Dur Elastic is formulated for exterior use with a UV-stable acrylic polymer base that resists chalking, colour fading, and embrittlement from ultraviolet radiation — the primary ageing mechanism for exterior coatings in Indian conditions where UV irradiance levels (particularly in North India summer) are 30 to 50 percent higher than in northern Europe; the UV stability ensures the coating maintains its elastomeric crack-bridging performance throughout its design service life of 10 to 15 years without the embrittlement that would occur with a non-UV-stabilised elastomeric coating