Interline 921

Description

A two component, solvent free, chemically resistant epoxy phenolic caulking compound formulated to provide ease of application, and greater flexibility in scheduling of tank lining applications.

Where To Use

As a versatile caulking compound suitable for application by standard airless spray equipment in both new construction situations, and for refurbishment of corroded tanks. The extended recoat window afforded by Interline 921 allows increased flexibility in working practice, and improved scheduling of contracts to allow more rapid return to service. Interline 921 caulking compound should be used for the treatment of weld seams, lap joints, kerb angles and other surface irregularities to provide a smooth uniform transition between uneven surfaces, prior to the application of Interline glass reinforced laminate systems.

Technical Information

Apply by airless spray only. Application by other methods, e.g. brush or roller, may require more than one coat and is suggested for small areas only or initial stripe coating.
Interline 921 can be applied by standard 63:1 ratio airless spray equipment when the paint temperature is maintained between 59-77°F (15-25°C). At lower temperatures an in-line heater of a suitable pressure rating may be used to assist with pumping and atomization of the product. Additionally, Interline 921 is suitable for application by plural component airless spray equipment capable of accurate proportioning, which allows more flexible application at high temperatures.

Due to pot life limitations, airless spray using plural component spray equipment is normally required for applications at temperatures greater than 77°F (25°C). Heavily pitted areas should be stripe coated by brush, to ensure good “wetting” of the surface. 

Fill deeply pitted areas by manual knife application or squeegee, to provide a level finish, flush with the adjoining surface. Surface temperature must always be a minimum of 5°F (3°C) above dew point. Do not apply at steel temperatures below 50°F (10°C). 

The climatic conditions within the tank must be controlled to maintain a maximum relative humidity of 70% at all temperatures. Exposure to unacceptably low temperatures and/or high humidities during, or immediately after, application may result in incomplete cure and surface contamination that could jeopardize subsequent intercoat adhesion. Note: VOC values are typical and are provided for guidance purpose only. These may be subject to variation depending on factors such as differences in color and normal manufacturing tolerances.