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. 323


Provides recovery qualities of over 99% with virtually no water absorption.

SEALTIGHT CERAMAR Flexible Foam Expansion Joint provides an excellent joint filler and back-up material for either horizontal or vertical expansion/
contraction joints and for stress and pressure relief in concrete pavements.

Technical Description
SEALTIGHT CERAMAR Flexible Foam Expansion Joint Filler is composed of a unique synthetic foam of isomeric polymers in a very small, closed-cell structure. Gray in color, CERAMAR is a lightweight, flexible, highly resilient material offering recovery qualities of over 99%. The compact, closed-cell structure will absorb almost no water.

SEALTIGHT CERAMAR Flexible Foam Expansion Joint Filler provides an excellent joint filler and back-up material for use in either horizontal or vertical applications where expansion and contraction movements must be accommodated. CERAMAR is compatible with all currently popular cold-applied sealants, caulks and hot-pour joint sealing compounds. It is lightweight and easy to cut or form in the field without waste.

CERAMAR compresses easily for use with shrinkage-compensating concrete and it may be used to relieve stress and pressure in concrete pavements.

HIGHLY FUNCTIONAL JOINTING AND SEALING SYSTEM: Two excellent SEALTIGHT Products, CERAMAR and GARDOX Horizontal Sealant, may be used together to provide an excellent horizontal sealing system for plaza decks, sidewalks, driveways, commercial and industrial floors. Refer to SEALTIGHT GARDOX Catalog No. 226.

Advantages and Benefits

bulletMay be sealed with hot or cold-applied sealants
bulletUser friendly, lightweight, flexible foam...forms or wraps around curved or circular surfaces
bulletCuts easily on the job with a razor knife...no breakage or waste
bulletOffers high resiliency and 99% recovery qualities...low compression values...non-extruding...minimal water absorption
bulletResists ultraviolet degradation...will not rot or deteriorate
bulletNon-impregnated...no staining or bleeding
bulletBonds easily with common cartridge adhesives

Application Tool


Utility Knife

For horizontal applications, position CERAMAR against the forms, at interrupting columns and objects or adjacent to abutting structures before placing the concrete. Vertical applications may call for CERAMAR to be placed between panels, panel-to-column joints or in block wall joints prior to sealing.

CERAMAR may be used with all hot- and cold-applied sealants.

Furnished in standard sheets 48" (1.22m) wide, 10' (3.05m) long. It is also available in precut widths of 2" to 46" (50.8mm to 1.17m)

CERAMAR meets the requirements of ASTM D 5249, Type 2, ASTM D 1752, Sections 5.1 through 5.4, with the compression requirement modified to 10 psi (7.03 g/mm) minimum and 25 psi (17.58 g/mm) maximum. It is non-gassing and is compatible with hot-pour joint sealants.

1/4" (6.4mm)
3/8" (9.5mm)
1/2" (9.5mm)
3/4" (19.1mm)
1" (25.4mm)
Wt./100 ft.
3.13 lbs.
4.70 lbs.
6.25 lbs.
9.40 lbs.
12.50 lbs.
15.29 kg
22.93 kg
30.52 kg
45.90 kg
61.03 kg
Pcs. Per
 Shipping Wt.
Per Bundle
160 lbs. (72.58 kg)
240 lbs. (108.86 kg)
250 lbs. (113.40 kg)
240 lbs. (108.86 kg)
260 lbs. (117.94 kg)

 Typical Physical Properties*
1. Compression, 50%
2. Extrusion
3. Recovery
4. Water absorption, volume %
*Test Method - ASTM D 545
(1/2" (12.7mm) thick test specimen)
13 psi (240 g/mm)
0.1 inch (2.5mm)

Due to its light weight, CERAMAR will float and must be held in place by compression or with a sealant. Read and follow application information, precautions and Material Safety Data information.

This material last updated August, 2000.

Products for Concrete Performance
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