April 10,2000


Mr. Harald Muench
Koester American Corporation
1206 Laskin Road
Suite 201 E
Virginia Beach, Virginia 23451

Subject: Report of Water Vapor Transmission Test Law Project Number 50160-0-3481.01.832

Dear Mr. Muench:

Law Engineering and Environmental Service, Inc. (Law) has completed the water vapor transmission testing of Koester's coating VAP 1-2000. The purpose of the testing was to measure the water vapor transmission through the coating using the ASTM E96-95 technique. This report presents the test procedures and test results.

TEST PROCEDURES

Law performed the testing in accordance with ASTM E96-95, Standard Test Method for Water Vapor Transmission of Materials. Three test specimens consisting of cement-mortal" disks measuring 4 inches in diameter and 0.25 inch in thickness were prepared by Law and shipped to Koester. Koester applied their coating to one side of the disks and returned them to Law for testing.

The wet method of ASTM E96-95 was performed. Wax sealant was used to seal the disks to the test dishes. The samples were sealed to the test dishes with the coated side of the samples facing away from the contents of the test dishes. The samples were kept and monitored in the laboratory conditions of 74 +- 2 °F and 55 +- 2 % relative humidity. The exposure was conducted for 3 weeks after which time it was discontinued per Mr. Muench's request.

TEST RESULTS

Test results are presented in the attached table. Thank you for the opportunity to work with you on this project. Should any question arise concerning this test report, please call us at (404) 817-0255.

Sincerely.

LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.

Wenfeng Li Staff Professional

Nhan H. Nguyen Project Engineer