ASW application recommendations. ASW dams should be placed far enough from the weld area to avoid exposure to temperatures in excess of 300f (149C). A pyrometer or temperature indicating material can be used to determine this point. ASW which has been charred may not dissolve but will instead fracture into small pieces when water is introduced to remove the dams. Dissolvo tape is backed with a silicone release paper which is peeled off before use.

ASW tape has sufficient tack to anchor dams securely in place, however, in very dry climates, or where maximum adhesion is required lightly dampen the adhesive side with water and apply immediately. In addition to selecting the location at which purge gas is to be introduced, a vent for the displaced air should be carefully selected so that no air remains trapped. All other open areas should be sealed to prevent leakage.

ASW also has many Industrial applications. ASW paper can be used in vertical pipes to catch falling debris and block air drafts, or as a floor cover to keep dirt out of drains without impeding water drainage. ASW tape can be used as a water soluble masking or grinding tape.

ASW is nontoxic and non-corrosive. When dissolved, the solution is slightly alkaline.

ASW materials are free of substances regarded as harmful to stainless steel and other metal pipes. Trace elements present in ASW are insignificant. The following is a typical chemical analysis of ASW.

Water Leachable Chlorides 150PPM (ASTM D 512-81) Sulphur 30PPM (ASTM D 129-78)

Halogenated Compounds 200PPM (ASTM D 808-81) Lead

* Less than 1PPM Mercury

* Less than 1PPM Cadmium

* Less than 1PPM Nitrate

* Less than 1PPM

* Spectro Photometric Analysis

ASW quality control procedures. Dissolvo maintains a comprehensive QC/QA plan to meet the critical requirements of the nuclear and fossil-fuel power plant construction industries. Where required, certifications and copies of the test reports can be furnished.

ASW grades and sizes. ASW products are available in several grades and sizes to meet all your purge dam requirements. Simply select the size and grade best suited for your particular application. Grade. Available Size. Description Recommended Use.

Grade. Available Size. Description Recommended Use.

ASW-35 is a lightweight paper for use in pipes up to 4" in diameter.

8-1/2" x 11" Sheet

17" x 22"Sheet

9" x 165' Roll

15-1/2" x 165' Roll

ASW-40 is light weight coated paper recommended for use in all pipe sizes where greater gas retention is required.

20-1/2" x 165' Roll

ASW-60 is a heavy weight Paper recommended for use in pipes over 4" in diameter.

15-1/2" x 22" Sheet

15-1/2" x 165' Roll

31" x 165' Roll

ASWT-Tape (Welding Adhesive Tape) is compatible with all grades of ASW. WAT is a pressure sensitive, water soluble tape recommended to hold in position, and when needed, to splice two or more pieces of Dissolvo paper.

1" x 300' Roll

2" x 300' Roll

ASW storage and handling.

Dissolvo should be stored in its original packaging avoiding water contact and extreme heat. To prevent deterioration from exposure to the elements, it is recommended that unused Dissolvo materials be returned to their original poly and kraft wrappings. The package should be resealed if Dissolvo is not to be used for several days or more. Dissolvo is available from your state distributor or your local welding supplier.