Guardian - WS720 Weather Proofing Silicone Sealant - Permanent & Flexible - Grey 300ml Tube

Brand: Guardian

Specification:

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 (within one hour) allows traffic soon after curing. 

Area 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.

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.

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.

Storage And Shelf Life

GUARDIAN WS720 should always be stored in dry and covered areas. The product should not be exposed to direct sunlight or be kept near any source of heat. Store in indoor at 25 C. The product Shelf life is up to 12 months when stored as per the recommended storage conditions.

Warranty

Royal Way Industries Middles East warrants that its products will meet its specifications. Royal Way Industries Middle East shall in no event be liable for incidental or consequential damages. Except as expressly stipulated, liability, expressed or implied, is limited to the stated selling price of any defective goods. 

Health And Safety

GUARDIAN WS720 Adequate ventilation should be provided with the extensive use of this sealant. On direct contact, uncured sealant may irritate eyes. Flush well with water and call a physician. Avoid prolonged contact with skin. See Safety Data Sheet (SDS) available on this product.

Recommended Joint Dimensions & Estimated Sealant Consumption

Joint Width (mm)                                  6          10        12        20       25 

Backer Rod diameter                           10        13        16        25       30

Backer Rod recess below surface      12        12        12        16       24 

Sealant Thickness                                6          6          6          10       12 

Sealant recess below surface              6          6          6          6         12 

Est. linear meter/liter                            24        16        12         5         3

GUARDIAN WS720 in 300 ml cartridges and 600 ml aluminum sausages

Technical Specification

Type: 100% silicone, One Component 

Appearance: Smooth, Non-Slump Paste 

Temperature Range‡ 

Application Temperature Range: Ambient up to 50°C (120°F) 

Useable Temperature Range: -60°C to 200°C (- 76°F to 392°F)

Drying Time* 

Tooling/Skin-Over Time: 20 minutes max @ 25˚C ± 2˚C 

Tack Free Time: 120 minutes @ 25˚C ± 2˚C 

Cure Time: 48-72 hours 

Full Physical Characteristics: 7 days

Physical Properties 

(Typical properties - values not to be used as specifications) 

Uncured 

Specific Gravity:  1.29 ± 0.02 

Slump/Sag Nil Cure System: Neutral - Moisture Cure 

Cured At Standard Conditions* for 7 Days 

Durometer Hardness (ASTM D2240, Shore A): 22±2 points 

Tensile Strength (ASTM D412): 150 psi ±5 (10.5 kg/cm2) 

Elongation at Break (ASTM D412): 700% 

Joint Movement Capability (ASTM C719): ± 50% 

Accelerated Weathering (ASTM C793- 91): Nil, UV resistance