CERAMAR – Flexible Foam Expansion Joint

Product Data, W. R. MEADOWS

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ceramar-flexible-foam-expansion-jointFlexible Foam Expansion Joint

CERAMAR is a flexible foam expansion joint filler 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.

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.

  • May be sealed with hot- or cold-applied sealants.
  • User friendly, lightweight, flexible foam…forms or wraps around curved or circular surfaces.
  • Cuts easily on the job with a razor knife…no breakage or waste.
  • Offers high resiliency and 99% recovery qualities…low compression values…non-extruding…minimal water absorption.
  • Resists ultraviolet degradation…will not rot or deteriorate.
  • Non-impregnated…no staining or bleeding.
  • Bonds easily with common cartridge adhesives.
  • Non-gassing.
  • ASTM D 5249, Type 2
  • ASTM D 1752, Sections 5.1 – 5.4, with compression requirement modified to 10 psi (7.03 g/mm²) minimum and 25 psi (17.58 g/mm²) maximum.
  • ASTM D 7174-05
May help contribute to LEED credits:
  • MR Credit 5.1: Regional Materials: 10% Extracted, Processed & Manufactured Regionally
  • MR Credit 5.2: Regional Materials: 20% Extracted, Processed & Manufactured Regionally

Furnished in standard sheets 48″ (1.22m) wide, 10′ (3.05m) long. Also available in precut widths of 2″ to 46″ (50.8mm to 1.17m)


Compression, 50% 13 psi (9 g/mm²) 89.6 kPa
Extrusion 0.1 inch (2.5mm)
Recovery 99.21%
Water absorption, volume % 0.246
*Test Method – ASTM D 545 (1/2″ (12.7mm) thick test specimen)
All technical data is typical information, but may vary due to test methods, conditions and operators.
Thickness Approx.
Wt./100 ft.²
Pcs. Per
Shipping Wt.
Per Bundle
1/4″ (6.4mm) 3.13 lbs. 15.29 kg 100 160 lbs. (72.58 kg)
3/8″ (9.5mm) 4.70 lbs. 22.93 kg 100 240 lbs. (108.86 kg)
1/2″ (12.7mm) 6.25 lbs. 30.52 kg 75 250 lbs. (113.40 kg)
3/4″ (19.1mm) 9.40 lbs. 45.90 kg 50 240 lbs. (108.86 kg)
1″ (25.4mm) 12.50 lbs. 61.03 kg 40 260 lbs. (117.94 kg)

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.

Due to its light weight, CERAMAR will float and must be held in place by compression or with a sealant.

Health and Safety
Refer to Material Safety Data (MSDS) for complete health and safety information.

This material last updated August 2009.


W. R. MEADOWS, INC. designs, manufactures, and markets high-quality building materials for today's construction professionals. Products are sold through an authorized distribution network. The family-owned and operated company focuses on product quality, exceptional service, and trusted integrity since its founding in 1926.
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