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. 221


SEALTIGHT HI-SPEC has no equal pound-for-pound for total life-cycle cost efficiency and return on investment.

Technical Description
SEALTIGHT HI-SPEC Polymeric Hot-Applied Sealant is a premium-quality, single-component joint sealing compound. It is formulated with a carefully balanced blend of 100% virgin polymer, asphalt, plasticizers and inert, reinforcing fillers to produce a hot-pour joint sealant with excellent bonding properties, high resiliency, ductility and resistance to degradation from weathering. It will not become brittle at low temperatures; will not flow or migrate from the joint at temperatures up to 140F (60C).

HI-SPEC is recommended for large-scale sealing of joints and cracks in Portland Cement and asphaltic concrete pavements because of its excellent cost efficiency, long sealant life and high return on investment. Typical applications include sealing expansion and contraction joints in concrete highways both transverse and longitudinal joints between concrete pavements and asphaltic shoulders and random cracks in both Portland Cement and asphaltic concrete pavements.

Advantages and Benefits

bulletProvides an economical hot-pour, single-component sealant for large-scale sealing of Portland Cement and asphaltic concrete pavements
bulletRecognized by public and private sector sealing contractors as the "best available" and "most cost efficient" joint sealant
bulletProduces tough, dependable joint seals with exceptional longevity
bulletOffers excellent cohesive and adhesive qualities
bulletResists degradation from weathering
bulletRemains ductile and resilient at low temperatures
bulletWill not flow or migrate at temperatures up to 140F (60C)

Application Tools

 Air Compressor

 Melter-Applicator with Wand



MELTING: HI-SPEC should be melted in a conventional double-boiler, oil-jacketed melter-applicator equipped with an agitator and separate control thermometers for both the oil bath and melting vat. On start-up of the melting kettle, add small quantities of HI-SPEC with the plastic bag liner to the melter.


Only melt enough material to be poured the same day. Material should be added to the melter as the sealant is withdrawn during the sealing operation.

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 be routed out to provide a sealant resevoir 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 the existing crack/loint 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 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.

New Concrete Pavement Sealing - Typical joint configuration should be 3/8" (9.54mm) wide with a 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.

DO NOT DILUTE. Do not heat to temperatures above 390F (199C). Reheating or prolonged (over 6 hours) heating at or above the safe temperature of 390F (199C) could cause this material to gel in the application equipment. A rapid increase in viscosity, accompanied with stringiness, signals the approach of gelation. Should this happen, the material must be rapidly pumped from the melting kettle and discarded. Apply sealant when substrate and air temperatures are 40F (4C) or higher. For optimum sealant performance all material left in the melter-kettle should be drawn off and discarded. Lines should be flushed out clean. Do not dilute with solvent. Read and follow application information and precautions. Refer to Material Safety Data Sheet for complete health and safety information.


50 lb. (22.7 kg) container
55 lb. (24.95 kg) cartons. Each carton contains two 27 1/2 lb. (12.475 kg) buns in polypropylene liners.

ASTM D 3405
Federal Specification SS-S-1401C
FAA Specification Item P-605
Corps of Engineers CRD-C 530

72.2 lbs./ft. (1,158 kg/m). A joint 1/2" x 1/2" (12.7mm x 12.7mm) will require 12.6 lbs./100 linear feet (18.5 kg/100m).

Pour point
Prolonged heating

Asphaltic Concrete Compatibility
370F (188C)
6 hours
Less than .90cm
Less than .3cm
Passed 100% extension @ 0F(-17C)
Passed 50% extension @ -20F (-29C)
More than 60%

This material last updated August, 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