O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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NO. 231-PD

SEALTIGHT® DIRECT FIRE
PARKING LOT SEALANT (PLS)

Precautions
PLS can be reheated several times. The material will not gel when overheated or heated for extended periods. Temperatures above 400°F for extended periods (over 6 hours) will begin to soften the material. If heated above 450°F, the material will begin to degrade and lose its flexibility.

Surface Preparation
The joints and cracks to be sealed must be clean and dry. The cleaning operation can be performed using a router, wire brush, oil-free compressed air, sand blaster, heat lance or other acceptable method. Curing compounds on interfaces must be removed by sandblasting. Dust, dirt and laitance should be blown out of the joint with oil-free compressed air immediately preceding the sealing operation. Sidewalls must be stable and intact. Air and pavement temperatures should be above freezing at time of sealant application.

Concrete or asphaltic Pavement and Maintenance Sealing - For ideal sealing with maximum effectiveness, it is suggested that cracks or joints should be routed out to provide a sealant reservoir 1/2" (12.7mm) wide with a minimum depth of 1/2" (12.7mm). This provides for a 1:1 width-to-depth ratio. For joints 1" (25.4mm) wide, the suggested depth is 1/2" (12.7mm) minimum.

Proper routing should be slightly larger than existing crack/joint to ensure proper adhesion to sidewalls.
The sealant should be applied into the crack/joint from bottom up, slightly overfilling. Once applied, a follow-up should be done with a soft, rubber, U-shaped squeegee to form a wipe zone of approximately 3-4 inches (76.2-101.6mm) wide along the crack/joint and flush with the highway or pavement surface. To control and maintain the suggested joint depth and sealant usage, SEALTIGHT CERA-ROD Heat-Resistant Backer Rod may be installed in the joint opening.

USE AND APPLICATION

LIMITED WARRANTY
W.R.MEADOWS,INC. warrants that at the time and place we make shipment, our material will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. Read complete warranty. Copy furnished upon request.

Disclaimer
The information contained herein is included for illustrative purposes only, and to the best of our knowledge, is accurate and reliable. W.R.MEADOWS,INC. cannot however under any circumstances make any guarantee of results or assume any obligation or liability in connection with the use of this information. As W.R.MEADOWS, INC. has no control over the use to which others may put its product, it is recommended that the products be tested to determine if suitable for specific application and/or our information is valid in a particular circumstance. Responsibility remains with the architect or engineer, contractor and owner for the design, application and proper installation of each product. Specifier and user shall determine the suitability of
products for specific application and assume all responsibilities in connection therewith.

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Copyright © 2002 O'Brill Company
Last modified: August 09, 2004