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. 232-2PD



Technical Description
SEALTIGHT 3405-Modified Low-Modulus Polymeric Compound is a quality, hot-applied, single-component sealer designated to effectively seal cracks and joints in both Portland Cement and asphaltic concrete surfaces. Provides a soft, flexible crack and joint sealer that remains pliable. Will not become brittle and crack in cold weather nor track in warm weather.

Various State D-3405 Modified Low-Modulus Specifications:
Iowa 4136.02A
Kansas TS109.4
Michigan 914.04A
South Dakota Low-Modulus Specification

Penetration, mm/10
Resilience, %
Flow, cm
Bond, 3 cycles @ -20F (-29C),
200% extension
Wt. per gallon, lbs.
Viscosity, CPS @ 380F
Asphalt compatibility

Recommended Pouring Temp.: 370F (188C)
Maximum Safe Heating Temp.: 390F (199C)

SEALTIGHT 3405-M should be melted in an oil-jacketed melter/applicator equipped with an agitator and separate temperature thermometers for oil bath and melting vat. Sealing may be done at air temperatures of 40F (4C) or higher. (NOTE: Application of sealant into frozen or wet pavement will result in loss of bond and premature failure of the sealant.)

Surface Preparation
The joints and cracks to be sealed must be clean and dry. Dust, dirt and laitance should be removed prior to application.

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 the bottom up, slightly overfilling. Once applied, a follow-up should be done with a soft rubber, U-shaped squeege 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.

NEW CONCRETE PAVEMENT SEALING: Typical joint configuration should be 3/8" (9.54mm) wide with a minimum 1/2" (12.7mm) depth for an approximate 1:1 width-to-depth ratio. Designated joint width and depth is determined by the appropriate highway or pavement authority. SEALTIGHT CERA-ROD Heat-Resistant Backer Rod may be installed in the joint opening to control depth and sealant usage.


55 lb. cartons containing two 27.5 pound blocks individually wrapped in poly bag liners.

Do not heat material to over 390F or polymer degradation and gelation may occur. Reheating or prolonged heating (in excess of 6 hours) without the addition of fresh material could cause the material to gel in the application equipment. A rapid increase in viscosity or stringiness signals the approach of gelation and the material should be promptly discarded. Refer to Material Safety Data Sheet for complete Health and Safety Information

This material last updated November, 2000.

W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.


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