IOTA 992 Silicone Structural Glazing Sealant

IOTA 992 Silicone Structural Glazing Sealant

Details

IOTA 992 Silicone Structural Glazing Sealant

1. Two components;  

2. Structural sealing and glazing for curtain wall

 

Features:

1. Two parts , neutral cure to form an extremely tough elastomeric rubber ensuring a durable, flexible, and watertight bond 

2. non-corrosive to metals, coated glass, low-E glass and many other substrates

3. Excellent weatherability and high resistance to UV radiation ,heat and humidity, and ozone

4. Excellent stability through wide temperature range from –50 ℃ to +150 ℃

5. Excellent unprimed adhesion to wide range of substrates

6. High level of mechanical properties

7. Good compatibility with other neutral silicone sealants

 

COLOURS

Part A (base) of IOTA 992 is available in white, part B (curing agent) in black; Black color after mixing.

 

PACKAGING

IOTA 992 is available in kit: part A in 200L drums (net 190L), part B in 20L pails (net 18.5L). 

 

SPECIFICATIONS

IOTA 992 is designed to meet or even exceed the requirements of Chinese national specification GB16776-2005 Silicone Sealant for Structural Glazing Complies with ASTM C 1184

 

Typical properties:

These values are not intended for use in preparing specifications  

Test Method

Property

Unit

Standard

Result  

GB/T 13477 (ISO 7390)

Slump

mm

≤3

0

GB/T 13477 (ASTM D 2377)

Tack free time

h

≤3

0.8

GB/T 13477

Working time (after 20 min.)

 

≤10

2.2

GB/T 531.1 (ISO 7619)

53113477

Hardness

Shore A

2060

43

GB 16776 (ASTM C 792)

Heat Aging

 

 

 

weight loss

%

≤10

3.5

cracking

 

Nil

Nil

chalking

 

Nil

Nil

GB/T 13477 (ISO 8339)

Tensile strength

MPa

 

 

23

 

≥0.60

1.13

90

 

≥0.45

1.02

-30

 

≥0.45

1.62

water immersion

 

≥0.45

1.01

water-UV exposure

 

≥0.45

1.09

adhesion failure

%

≤5.00

0

extension rate at ultimate tensile strength at 23

%

≥100

140

*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 992 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 992 should not be applied:

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

To frost laden or damp surfaces 

For continuous water immersion

When surface temperature below 4℃ or over 50℃  

 

HOW TO USE

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.

 

Mixing and Dispensing

To obtain the optimal performance of IOTA 992, it is recommended that base and curing agent thoroughly mixed using an airless two-part silicone dispensing machine.

 

IOTA 992 should be mixed at a ratio of 9:1~11:1 base to curing agent by volume; or 11:1~13:1 base to curing agent by weight.

 

Lot matching of IOTA 992 base to curing agent is not required. Before use, it is recommended that curing agent be fully stirred to ensure the homogeneity of all components.

992 part B curing agent will react with atmospheric moisture, therefore should not be exposed to air for prolonged periods of time.

 

Priming

Priming is not usually required when using IOTA 992. But it is essential that adhesion is tested prior to use to decide whether to use primer or not. 

 

Masking and Tooling

Areas adjacent to joint may be masked to ensure a neat sealant line. Do not allow mask tape to touch clean surfaces to which the silicone sealant is to adhere. Tooling should be completed in one continuous stroke after sealant application. Masking tape should be removed immediately after tooling.

 

Equipment Cleaning

When not being used, it is recommended that the dispensing equipment be purged either with the base component or flush with suitable solvent.

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