Home > Companies > Instarmac Group plc > Envirobed HA104 Bedding Mortar

An environmentally friendly alternative to resin-based materials, specifically formulated for the bedding of all access covers. It is supplied as a two-component system which contains a blend of special cements, polymer graded aggregates and recycled glass. The combined components provide a high performance mortar, which can accommodate depths of 10–50 mm in one pass.


  • HAPAS approved since 2005.
  • 53 N/mm² compressive strength.
  • Conforms to HA104/09 at three hours.
  • Can be used in the wet.
  • 6.1 N/mm² tensile strength at three hours.


It is specifically formulated for the bedding of ductile ironwork conforming to the Highways Agency Design Manual for Roads and Bridges: Mortars for Bedding Ironwork, HA104/09, part 5, clause 6.1 and is particularly suitable for use in wet weather conditions. With superior compressive, tensile and flexural strengths reached after just three hours, Envirobed HA104® provides all the performance but none of the environmental hazards of traditional resinous materials, such as hazardous waste disposal.

Standard product features

Compressive strength:

  • 1 hour: 30 N/mm².
  • 3 hours: 53 N/mm².
  • 24 hours: 64 N/mm².
  • 7 days: 73 N/mm².
  • 28 days: 78 N/mm².

Tensile strength:

  • 1 hour: 3.3 N/mm².
  • 3 hours: 6.1 N/mm².

Flexural strength (at three hours):

12 N/mm².

Bond strength:

3.5 N/mm².


2298 kg/m³.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-50/303 Cement gauged prescribed mix mortar

Product specification

An important note about specifying



Instarmac Group plc


+44 (0)1827 254400

Product reference

Envirobed HA104

Manufacturer details

Danny Morson Way,
Birch Coppice Business Park,
Staffordshire, B78 1SE
Tel +44 (0)1827 254400
Fax +44 (0)1827 285386
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