International Interline 921

International Interline 921 is 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.

Best Uses

International Interline 921 is a versatile caulking compound suitable for application by standard airless spray equipment in both new construction solutions, 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.

Application

All surfaces to be coated should be clean, dry and free from contamination. Prior to paint application all surfaces should be assessed and treated with ISO 8504:2000.

Oil or grease should be removed in accordance with SSPC-SP1 solvent cleaning.

Abrasive Blast Cleaning

This product must only be applied to surfaces prepared by abrasive blast cleaning to SA21/2 (ISO 8501 - 1:20017) or SSPC SP10. A sharp, angular surface profile of 75-100 microns is recommended.

Interline 921 must be applied before oxidation of the steel occurs. If oxidation does occur the entire oxidised area should be reblasted to the standard specified above.

Surface defects revealed by the blast cleaning process should be ground, filled or treated in the appropriate manner.

Where local VOC regulations allow, surfaces may be primed with Interline 982 to 15-25 microns (0.6-1.0 mils) dry film thickness before oxidation occurs. Alternatively, the blast standard can be maintained by use of dehumidification.

Interline 982 can hold a blast for up to 28 days in the semi-protected environment of a tank interior. If moisture is present on the surface, oxidation will occur and reblasting will be required.