GUARDIAN WS720 is a High-performance Weather Sealant one-part, cold applied, moisture curing, 100% silicone sealant that is formulated for Joint seal. It has ultra-high elongation and remains very durable. It has good flexibility and a low modulus, so it will maintain its integrity on joints with movement. GUARDIAN WS720 exhibits excellent unprimed adhesion to concrete, steel, and most other construction substrates, provided they are clean, dry and free of dust and frost. It is unaffected by sunlight (ultraviolet rays), ozone, temperature extremes, rain and snow. It has a long service life, under normal conditions it will maintain its physical properties between -60°C to 200°C (-76°F to 392°F).

Properties:

• Horizontal, Vertical joints in concrete, Metals
• Suitable for Extreme joint movement
• Concrete, steel, most construction substrates
• Suitable for roads less curing time

AREAS OF APPLICATION

• Structural attachment of many panel systems
• Recommended sanitary applications
• Panel stiffener applications
• Weather sealing of most common construction materials including glass, ACP
• aluminum, steel, painted metal, EIFS, granite and other stone, concrete, brick and plastics

METHOD OF APPLICATION-SURFACE PREPARATION

New concrete should be allowed to cure and dry for at least 7 days. All joints must be clean, dry, and free of contaminants before the backer rod is installed and GUARDIAN WS720 is applied. If a joint is flushed with water, it should be done only in one direction to reduce contamination.

After drying, the top inch (25mm) of each face should be sandblasted in a separate pass, with the nozzle held at an angle no more than two inches (50mm) from the face.

Dust and loose particles must be blown out of the joint with oil-free compressed air, moving only in one direction. An oily surface may reduce adhesion.

APPLICATION JOINT DESIGN

In general, it is recommended that the depth of GUARDIAN WS720 be equal to one half the joint widths. Ideally, sealant thickness should be between 1/4” (6mm) and 1/2” (12mm) below the surface. The use of a polyurethane or expanded polyethylene foam backer rod prevents undesired threesided adhesion and maintains correct sealant depth. The backer rod must be a snug fit on both sides of the joint throughout its length

HEALTH & SAFETY

GUARDIAN WS720 Adequate ventilation should be provided with the extensive use of this sealant

On direct contact, uncured sealant may irritate eyes. Flush the well with water and call a physician. Avoid prolonged contact with the skin. See Safety Data Sheet (SDS) available on THIS PRODUCT

This product is intended for use only by professional applicators in accordance with the advice given in this document, the SDS and the container(s), and should not be used without reference to the SDS that Royal Way Industries the Middle East has provided to its customers. KEEP OUT OF REACH OF CHILDREN

All work involving the application and use of this product should be performed in compliance with all relevant National, Health, Safety & Environmental standards & regulations.

JOINT DIMENSIONS

The backer rod should be installed at the appropriate depth to provide the correct thickness of GUARDIAN WS720 and recess below the surface, as shown in the table below. The sealant should be applied in one continuous movement with the nozzle set to fill the joint from the bottom up to avoid creating air voids. The sealant should be tooled to force it against the joint faces for maximum adhesion and to provide a recess below the surface, shown below. Excess sealant should be scraped up and removed. If joints are properly recessed, the highway may be returned to traffic as soon as installation and cleanup are completed.

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