Stonel Associates, Inc.
25 Flint Ridge Road
Monroe, CT 06468
(203) 452-0470

Report No. 0221.3 Date: 07-MAR-01

Re: Polylok Riser - P/N 3009 and Lid - P/N 3009C

Test Conducted For: Polylok Inc.
173 Church Street
Yalesville, CT 06492
Attn: Harry Plander V.P.

Tests performed At: United Concrete Products, Inc.
173 Church Street
Yalesville, CT 06492

Tests Witnessed By: George E. Nelson on 21-FEB-01

Items Tested: Four (4) Riser columns with Lids, secured and equally spaced, in a common six (6) inch slab of concrete. Each column consists of seven (7) HDPE injection molded Risers and one (1) HDPE injection molded Lid. Each Riser column is 20 inches in diameter and 42 inches in height. The Riser and Lid joints contain foam seals and all sections are secured together with number 10 x 1 1/2 inch long stainless steel sheet metal screws.

Object of Testing: On one Riser column, to determine the side pull force required to cause catastrophic top Riser failure, measured with a Dillon 10,000 pound Dynamometer, while the fourth Riser is firmly supported against the pulling force.

Findings: A two-ply heavy-duty nylon sling was positioned on one column in the upper area of the seventh (top) Riser. The fork of a 10 ton heavy duty lift truck was positioned against the top of the fourth Riser, in line with the nylon sling. The sling was linked to a 6,000 lb. capacity Lug-All rachet cable puller next to the Dynamometer and the loose end was secured on the frame of the lift truck.
The top Riser withstood a direct pull of 2,000 lbs. and showed no visible indication of failure. At 2,500 lbs. the top two Risers broke from the column, while the other five Risers were intact with the bottom Riser still secured in the concrete slab.

Respectfully submitted,

George E. Nelson
Stonel Associates, Inc.