MasterProtect EL 850: Silicone-modified, anti-carbonation, elastomeric waterproof coating

Formerly: Silflex

How does MasterProtect EL 850 work?

MasterProtect EL 850 is a water-based, silicone-modified, elastomeric coating for waterproofing exterior surfaces. It has superior crack-bridging ability with a total elongation of 700%. It retards carbonation of concrete. It complies with Federal Specification TT-C-555B, Type II.

Recommended uses:

  • Exterior
  • Vertical surfaces
  • Above grade

What are the unique features of MasterProtect EL 850?

  • Available in a broad range of colors
  • Resists wind-driven rain; helps prevent water penetration into the substrate
  • Breathable to allow water vapor to escape
  • Excellent adhesion, bonds securely to substrate for long-term durability
  • Excellent hiding power
  • Low VOC content for broad compliance across all regions
  • Resistant to dirt pickup

What are the benefits of MasterProtect EL 850?

  • Silicone-modified acrylic formula is recoatable
  • High elongation and recovery for durable performance over dynamic cracks
  • UV resistance provides excellent color retention for a long-lasting, attractive finish
  • Effective carbon dioxide diffusion barrier, protects embedded steel from corrosion
  • Flexibility at very low temperatures makes it suitable for all climates

US / Canada Product Information

Data Guide

Data Guide (French)

Data Guide (Spanish)

Certification Letter

Guide Spec

LEED Letter

Safety Data Sheets (SDS):

MasterProtect EL 850 - Color Series Medium

MasterProtect EL 850 - Color Series Neutral

MasterProtect EL 850 - Color Series Pastel

MasterProtect EL 850 - Color Series Ultra Deep

MasterProtect EL 850 - Tint Base

MasterProtect EL 850 - Medium Tint Base

MasterProtect EL 850 - Neutral Tint Base

MasterProtect EL 850 - Pastel Tint Base

MasterProtect EL 850 - Ultra Deep Tint Base

Mexico - Spanish

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Safety Data Sheet (SDS)

Find all available safety data sheets for this product.

Product Certifications

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Related Literature

Certification Letter

pdf (74.76 Kb)

Certification Letter

pdf (77.31 Kb)

Data Guide

pdf (206.17 Kb)

Guide Spec

doc (172.50 Kb)

LEED Letter

pdf (109.19 Kb)

Wall Coatings Selector Guide

pdf (529.62 Kb)

zip (56.01 Kb)