Silcor® PMMA HG Data Sheet

Product Description

SILCOR® PMMA HG is a two-component, high performance, fast-curing, cold hand-applied liquid waterproofing membrane. The product is specially formulated MMA with advanced ESSELAC resin technology which produces a tough, continuous, seamless and flexible Polymethylmethacrylate membrane. ESSELAC resin technology comes to GCP from its acquisition of Stirling Llyod which has 50+ years of global track record in servicing infrastructure and commercial projects of varying nature.

SILCOR® PMMA HG can be applied to a variety of substrates included but not limited to concrete, masonry, and steel. 

UNREINFORCED system (Reinforcement optional)

• Buried waterproofing applications over concrete substrates including but not limited to applications with concrete topping slabs, paver & pedestal, vegetative roof and planters. Can be used in both pedestrian and vehicular applications with approved wearing course.
• Buried/covered curb details and upturns
• Concrete, masonry & metal substrates

Fully REINFORCED system

• Includes all the above applications that are UV exposed.

Product Advantages 

High Performance Waterproofing Membrane

• Seamless & fully bonded to substrate
• Strong inter-coat adhesion
• Unlimited overcoating window   
• Concrete can be poured directly over PMMA application
• Suitable for flat deck application - Unaffected by ponding water
• Can directly receive pavers and pedestal
• Root and Rot Resistance (EN testing)

Fast cure and Easy Application

• Unaffected by high humidity
• Can be applied in one or two coats
• Simplifies application to irregular profiles & complex details
• Provides quick access to hard to reach areas
• Rainproof in 1 hour

Superior Durability & Weather Resistance

• Tough & flexible, able to accommodate differential movement
• Excellent crack bridging capability
• Chemical & UV resistance 
   

Installation Temperature

SILCOR® PMMA HG can be applied at temperatures between 32°F - 104°F (0˚C - 40˚C)
SILCOR® PMMA HG Winter Grade 32°F – 60°F (0˚C - ˚15C)
SILCOR® PMMA HG Summer Grade 50°F – 86°F (7˚C - ˚30C)
For application temperatures above 86°F up to 104°F, pot life will be significantly reduced, please contact your local GCP representative.  
 

System Components

GCP has a range of products to complement the SILCOR®  PMMA HG System. These include:

• SILCOR® PMMA Concrete Sealer – Fast-curing, high-strength reactive resin used with SILCOR®  PMMA Powder Cat to form a strong cohesive bond to substrates and seal surfaces.
• SILCOR® PMMA Metal Primer – Fast-curing, high-strength reactive resin used with SILCOR®  PMMA Powder Cat to form a strong cohesive bond to metal substrates.
• SILCOR® PMMA Powder Cat – BPO Initiator to be used with SILCOR®  PMMA HG, Concrete Sealer and Metal Primer
• SILCOR® PMMA Fabric - Polyester mesh used as reinforcement specially designed for compatibility with SILCOR® PMMA HG

Packaging & Storage: 

Storage & Handling

Safety regulations. Storage temperature shall not exceed 77°F (25°C). Store cool and dry, out of direct sunlight. Do not store near open flame or food. The components have a shelf life of one year at a minimum in the original unopened container. If your product is more than twelve months old, you must contact the Technical Service Department before use. Please refer to SILCOR® PMMA HG technical data sheet and details for application instructions. 

Health & Safety

Refer to and read individual component safety data sheets and information sheets for further information. Immediately install entire contents of the pail after mixing, do not exceed recommended pot life of the material.

Coverage

Surface Preparation

Liquid Applied waterproofing systems are dependent on the quality of surface preparation. 

Concrete: The substrate must be dry and free from oil, grease, dirt, bituminous and other contaminants. Unsound concrete and laitance shall be removed by appropriate mechanical means. All the cement dust should then be removed from the substrate. All bug holes, cracks and voids must be cleaned of debris and moisture by vacuum or compressed air and be filled. For suitable materials please contact our Technical Services Department.

Metal: The substrate must be dry and free from oil, grease, dirt and other contaminants. All loose rust and scale must be removed with appropriate mechanical means. For outside applications, PMMA Metal Primer should be applied as soon as possible (4 hours) to newly prepared surfaces

For other substrate preparation and application-related questions contact GCP Technical Services.

For compatibility with other construction materials or where additives, cement replacement or curing compounds have been used please consult the Technical Services Department.

Substrate Bond/Adhesion Test

Prior to full application of the Concrete Sealer or Metal Primer, it is recommended that a bond/adhesion test should be conducted to determine adequacy of substrate preparation and adhesion. The bond/adhesion of the primer to the substrate should be greater than or equal to 290 PSI (2MPa). Some applications may require higher values. If low values are obtained, this would indicate that further preparation is required.

Application

Primer  

The Concrete substrate must be primed with SILCOR® PMMA Concrete Sealer before application of the SILCOR® PMMA HG membrane with a brush or roller. SILCOR® PMMA Concrete Sealer can be applied on minimum 7-day old concrete. Use SILCOR® PMMA Metal Primer for the application on metal. Concrete Sealer or Metal Primer may be brushed or rolled onto clean and prepared substrate. Allow it to be cured completely prior to SILCOR® PMMA HG liquid membrane application. 

Membrane

Use an agitator to mix the SILCOR® PMMA HG resin and PMMA Powder Cat until the liquid is completely homogenous for at least 2-3 minutes.  For application at low temperatures (<50°F), ensure thorough mixing.  Check for undissolved BPO particles. Please contact your local GCP representative for additional questions.

The amount of catalyst powder must be adjusted according to the temperature as given in the table below.

Catalyzed SILCOR® PMMA HG resin is poured onto the primed substrate and spread using a trowel, brush or roller. Other methods such as notched squeegee or skid-leveler are acceptable depending upon contractor preference and substrate regularity.

For vertical surfaces, the material should be applied by brush or trowel in 2 layers of 40 mil each.

Buried Application: For all non-UV exposed applications, SILCOR® PMMA HG can be applied without reinforcement in field. Reinforcement will be required only for details like penetrations, cracks, and joints. SILCOR® PMMA HG can be trafficked or loaded with overburden once fully cured.

UV exposed application: SILCOR® PMMA HG system can be left exposed to UV by using PMMA Fabric as reinforcement in between 2 layers of 40 mil SILCOR® PMMA HG.

Powder Catalyst/BPO Levels

*From 32°F to 86°F, Pot Life ranges between 15-20 minutes.

**For application temperatures above 86°F up to 104°F, pot life will be significantly lower, please contact your local GCP representative.

^{Note: SILCOR PMMA HG system is extremely rapid cure. Excessive mixing may reduce working time of resin.}

Cleaning

All tools should be cleaned with acetone before the material is allowed to cure.

 Physical Properties