High density, compressible closed cell, polyethylene filler for movement joints in civil/ structural works and water retaining structures

Product Applications

AEROFIL® 2 is designed for water retaining structures such as reservoirs, sea walls subject to thermal movement and wave action, and heavily trafficked floors such as pedestrian areas, factory flooring and elevated structures.

Aerofil 2’s high compressive strength and density combined with low load transfer characteristics make it ideal for creating joints in large in-situ concrete sections without distortion from wet concrete and vibrating techniques.

Its inherent compressive strength and stiffness provides excellent resistance to water pressure so that the subsequent surface sealant is supported to prevent adhesion failure at the shoulders of the joint. The closed cell construction prevents moisture absorption.


Spot bond in position using Pak Adhesive at approximately 10-12 sq m per litre to bond to the substrate after cutting to size with a stanley knife or similar. (Full coverage 5 sq m per litre per face, 2.5 m2 bonded area).

Specification Compliance

Department of Transport, Specification for Highway Works 1991, Clause 1015 (low compression for bridge expansion joints). Scottish Office Industry Department, Welsh Office, Department of the Environment for Northern Ireland.

NBS Specification Clause

Refer to Clause E40 520.

Typical Slab/Wall Expansion Joint

    Physical Properties

    Property Typical Results
    Density 60 ± 10% kg/m3
    Water absorption after 24 hours < 2%
    Compressive strength @ 25% strain 165 ± 20% kN/m2
    Chemical Resistance Inert to most dilute acids and alkalis, resistant to oil and hydrocarbons
    Operating Temperatures -40°C to +90°C

    Product Advantages

    • High density - provides support for surface sealants subject to hydrostatic pressure.
    • Non-extruding - will not be displaced by compressive loads and movement.
    • Resilient - will not distort under load from wet concrete.
    • Deformable - accepts movement with low load transfer.
    • Recovery - 95% after 25% compression.
    • Closed cell - prevents water absorption.
    • Chemically resistant - inert to most dilute acids and alkalis, resistant to oil and hydrocarbons, rot proof

    Details shown are typical illustrations only and not working drawings. For assistance with working drawings and additional technical advice please contact GCP Technical Services.


    Aerofil 2 Boards 0.8 m x 2.0 m (1.6 m²)
    Thicknesses 10 mm, 20 mm, 25 mm, 50 mm
    Ancillary Products  
    Pak Adhesive Pak Adhesive 5 litre can (full coverage approx. 5 m2 per litre - 2.5 m2 bonded area)
    Complementary Materials 2 part polysulphide sealants

    All test results shown in this data sheet are determined under laboratory conditions and with the product sample taken directly from stock in its original packing without any alteration or modification of its component parts.

    Health and Safety

    There is no legal requirement for a Safety Data Sheet for Aerofil 2. For health and safety questions on these products please contact GCP Applied Technologies Products Ltd.

    For Pak Adhesive and GCP Sealants read the product label and Safety Data Sheets (SDS’s) before use. Users must comply with all risk and safety phrases. SDS’s can be obtained from GCP Applied Technologies or from our web site at | United Kingdom customer service: +44 (0) 1480 478421

    We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

    AEROFIL is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

    © Copyright 2018 GCP Applied Technologies, Inc. All rights reserved.

    This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

    Last Updated: 2022-11-24