IOTA 998 Silicone Weatherproofing Sealant

IOTA 998 Silicone Weatherproofing Sealant

Details


IOTA 998 Silicone Weatherproofing Sealant

1. weatherproofing joint seal for the curtain wall

2. ±25% movement capacity

 

PRODUCT FEATURES

1.Excellent weatherability, virtually unaffected by sunlight, rain, snow and ozone 

2.Neutral cure-suitable for use on metals, coated glass, aluminum panels, terracotta panels, concrete materials, galvanized steel and many other substrates.

3.Extension/compression movement capability of up to ±25 percent of the original joint width

4.Excellent resistance to temperature extremes, stable and flexible over the temperature range from –50 to +150 ℃

5.Excellent unprimed adhesion to a wide variety of building materials  

6. Easy of application-ready to use as supplied  

7. Good compatibility with other neutral silicone sealants

 

COLOURS

IOTA 998 is available in black, gray, white and other customized colours.

 

PACKAGING

IOTA 998 is available in disposable cartridges (net 300ml) and sausages (net 590ml)

 

SPECIFICATIONS

IOTA 998 is designed to meet or even exceed the requirement of Chinese specification JC/T 882-2001 25HM Complies with ASTM C 920

 

Typical properties

These values are not intended for preparing specifications.

Test Method

Property

Unit

Standard

Result

GB/T 13477 (ISO 7390)

Slump

mm

≤3

≤3

0

0

GB/T 13477 (ISO 8394)

Extrusion rate

ml/min

≥80

856

192

GB/T 13477(ASTM D 2377)

Tack free time

h

≤3

1.1

GB/T 13477 (ISO 7389)

Extension recovery

%

≥80

97

GB 16776 (ISO 10563)

Weight loss

%

≤10

5.6

GB/T 13477 (ISO 8339)

Modulus at 23

MPa

 

0.4

0.84

GB/T 13477 (ISO 11600)

Movement capability

%

±25

±25 

GB/T 13477

Extension/compression rate

%

±25

±25

GB/T 13477

Adhesion at fixed stretch

 

No failure

No failure

GB/T 13477

Adhesion after heat contract and cold extension

 

No failure

No failure

GB/T 13477

Adhesion after UV-water exposure

 

No failure

No failure

*GB: Chinese National Standard   

 ASTM: American Society for Testing and Materials 

 ISO: International Standardization Organization

The “GB” testing method is equivalent or partly equivalent to that in the “()”

 

STORAGE AND SHELF LIFE

IOTA 998 should be stored at or below 27℃ in original unopened containers. It has a shelf life of 12 months from the date of manufacture.

 

LIMITATIONS

IOTA 998 should not be applied:

As structural sealant;

To the materials that bleed oils , plasticizers or solvents, such as impregnated wood, oil-based caulks;

In totally confined spaces as sealant requires atmospheric moisture for cure;

 To frost laden or damp surfaces;

For continuous water immersion;

When substrate surface temperature below 4℃ or over 50℃ to copper, zinc or lead coated surfaces.

 

Surface Preparation

Clean all joints removing all foreign matter and contaminants such as oil, grease, dust, water, frost, old sealants, surface dirt, or glazing compounds and protective coatings.

 

Application Method

Install back-up materials or joint fillers, setting blocks, spacer shims, and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required for non-porous surfaces, but may be necessary for optimal seal performance of certain porous surfaces. So adhesion test is always recommended.

 

Apply IOTA 998 in a continuous operation using dispensing guns. Before a skin forms, tool the sealant with light pressure to spread the sealant against the backing materials and joint surfaces. Remove masking tape as soon as the bead is tooled.


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