Hydrocell XL is a cross-linked, closed cell, semi-rigid, non-absorbent polyethylene joint filler, used for forming or filling movement joints in concrete, brickwork and blockwork. The product provides excellent support for sealants subject to hydrostatic pressure and is particularly recommended for water retaining or water excluding structures.

General information

Uniclass 2015

Pr_35_90_87_27 Expanded polyethylene (PE) foam stripsPrimary


E40/520 Sheet joint filler

F30/610 Movement joints with sealant

F30/76 Movement joints with sealant

P12/385 Sealant backing material

Specification data - Expanded polyethylene (PE) foam strips

Product Reference

Hydrocell XL

Standard product features


  • Recovery: 98% after 50% compression.
  • Compressive strength: 0.15 N/mm².
  • Water absorption: < 0.05% by volume.
  • Weathering test: No disintegration.
  • Chemical resistance: excellent resistance to acids, alkalis, oxidising agents and biological deterioration.


  • Water Authorities Association, Civil Engineering Specification for the Water Industry 4th Edition, Clause 2.124
  • DTp Specification for Highway Works, December 1991, Series 1000, Clause 1015.
  • BS 5628, Part 3: Code of Practice for the Use of Masonry.
  • Drinking Water Inspectorate Regulation 31(4)b of the Water Supply (Water Quality) Regulations 2000 and 2001.

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