Kommerling GD 677NA is a 2-component polyurethane sealant. Kommerling GD 677NA demonstrates high strength and elasticity. It has excellent adhesion to clean surfaces such as glass, aluminum, galvanized and stainless steel. Primers are not required.

NOTE:
The foregoing information is published as general information only. The listed properties and performance characteristics are typical values and are not to be interpreted as manufacturing specifications.

Kommerling GD 677NA is designed to be used as a secondary edge sealant for dual-seal insulating glass units and is widely used in the manufacture of high-end wood windows.

Kommerling GD 677NA demonstrates excellent adhesion to glass surfaces and most IG spacer systems including aluminum, anodized aluminum, stainless steel, and tin plated steel. It has been formulated to work in hand-gunning as well as fully automated robotic application.

Typical application rates are a minimum 4.0mm depth for gas-filled IG units. (However, when determining sealant volume to apply, unit size, weight, and glazing system design need to be evaluated for proper IG assembly design).

Substrate Preparation:
The surfaces to be bonded must be dry, clean and free from dust and grease. Glass surfaces should be thoroughly cleaned by hand or machine with non-film forming, low residue detergent and rinsed thoroughly with clean hot water.

Application:
When using automatic mixers observe the correct setting of the dosing cylinder. The mixing ratio is 10: 1 by volume and 10: 0.65 by weight. The two-component mixture must be applied within approximately 15 minutes (pot life at 23^oC / 73^oF). At a higher temperature, the pot life is shorter.

Prepare only the amount that can be applied within this period of time.

As temperature increases, pot life decreases. General pot life data for Kommerling 677NA is as follows:

15 minute pot life at 20^oC (68^oF) material temperature

8 minute pot life at 30^oC (86^oF) material temperature4 minute pot life at 40 ^oC (104^oF) material temperature

Note: The mixing ratio of Part A to Part B can go to 10: 1.1 by volume without a detrimental affect on mechanical properties. Undercatalyzing must be avoided.

Curing:
Kommerling GD 677NA should not be applied below 10^oC (50^oF). The curing speed of Kommerling GD 677NA depends on the ambient temperature of the units after fabrication:

• At 10^oC (50^oF) the curing time doubles or triples.

   

• At 30^oC (86^oF) curing times are shortened by 50%.

• A tack free surface is reached after approximately 5 hours at 23^oC (73^oF). IG units should not be moved or subjected to excessive stresses until sealant has nearly reached full cure.

Cleaning:
Citrus based solvents can be used to clean tools and equipment immediately after use to remove fresh uncured material.

Equipment:
The following equipment is suitable for applying Kommerling GD 677NA:GRACO Hydra-Mate Shovel Pumps equipped with King air motors, GRACO Hydramate Shovel Pumps equipped with Bulldog^® air motors and 1-1/4" supply line, Reinhardt Technik Pumps, Schwartz, Lisec and Bystronic automated lines.

Kommerling GD 677NA is available in the following standard packages:

Storage and Shelf Life

Store material in original unopened packaging at temperatures between 40°F-90°F. Shelf life is 9 months when stored as recommended.

Safety
Prior to working with this or any product consult product label and Material Safety Data Sheet (MSDS) for necessary health and safety precautions.

CAUTION:
All statements and technical information in this document are based on tests or data that ADCO believes is reliable. However, ADCO does not warrant or guarantee the accuracy or completeness of this information. The user has sole knowledge and control of factors that can affect the performance of ADCO’s products in the user’s intended application. It is the user’s responsibility to conduct tests to determine the compatibility of ADCO’s product with the design, structure, and materials of the user’s end product and the suitability of ADCO’s product for the user’s method of application and intended use. The user assumes all risk and liability arising out of such use.