Twin pack PU compound – semi-rigid PU joint filler

flexothane® 80 is a twin pack compound designed to be used as a joint-filler in floors where movement is limited and reinforcing of the edges of the joint is required. Due to its good compressive properties, it helps reinforce the joint against the effect of wheeled traffic.


flexothane® 80 P can be used as a reinforcing joint filler for joints in floors designed to handle heavy wheeled traffic.

  • Tough material, withstands heavy traffic, high abrasion resistance
  • Good chemical resistance to a range of chemicals
  • Can be installed to a flush finish to protect the joint arises in factory or warehouse applications
  • No priming required
Surface Preparation

Thorough preparation of joints is essential if a satisfactory seal is to be obtained. For concrete, stone or masonry surfaces, all traces of dust, laitance, mould release oil, previous sealant and all other foreign materials must be removed by sandblasting or mechanical abrasion, followed by blowing out the joints with dry, oil free compressed air.

Suitable cleaning solvents include abe® thinners no. 3, IPA or MEK. Ensure the solvent is compatible with the substrate prior to cleaning.

Protection of adjacent surfaces

Masking tape applied to areas adjacent to the joint will protect them from contamination and enable the joints to be finished in a neat line. The tape should be applied after the joint has been prepared, prior to any priming or sealing operation and removed after all finishing and tooling operations have been completed, but before the sealant has cured.


Add the contents of the activator container to the base and mix well preferably using a slow speed drill and flat mixing paddle.  Ensure that air is not entrained. If required add graded silica sand, mixing thoroughly to ensure that all the aggregate is well dispersed. Use immediately as the product has a limited pot life.

Typical Physical Properties

Download Technical Datasheet for Typical Properties.


In new floors delay installation as long as possible as shrinkage of the concrete causes progressive opening of the joints. A minimum of 28 days for the concrete to cure is a requirement.  The joint depth should be a minimum of 50 mm. Place a layer of silica sand at the base of the joint and fill with the thoroughly blended flexothane® 80 P to the full depth of the joint by either pouring or pumping in using a closed barrel gun. As a flush finish is required overfill with the compound to create a raised surface.  Check an hour or so after the original application to ensure that some of the jointing material has not seeped away and top up if necessary. The excess material should be shaved or ground flush the next day. Staining of the areas adjacent to the joint can occur and this should be allowed for. No priming is required.


Tooling of sealants is necessary for complete air-free filling of voids and to assist in making contact to the surfaces to which the sealant is applied. The surfaces of the joint should be smoothed with a clean putty knife or spatula.


Tools should be cleaned immediately after use, and before the material has cured, with abe® super brush cleaner followed by washing with soap and water. Once the product has polymerize it may only be removed mechanically.

Model Specification

The two part pourable PU joint sealant will be flexothane® 80 P to assist in protecting and reinforcing the edges of joints as supplied by a.b.e.®

 flexothane® 80 P will be applied in accordance with the recommendations of a.b.e.® 


2 litre kit

Handling & Storage

This product has a shelf-life of 12 months if kept in a dry cool place in the original packaging. In more extreme conditions this period might be shortened.

Health & Safety

Uncured flexothane® 80 P is toxic and should not be allowed contact with skin and eyes. The use of gloves and eye protection is advised. Splashes into eyes should be washed immediately with plenty of clean water and medical advice sought. Ensure the working area is well ventilated during application and drying.

Always wear gloves when working with the material and avoid excessive inhalation and skin contact.

Cured flexothane® 80 P is inert and harmless.

Important Note

This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® endeavours to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot accept any liability for application – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied.

Further Information

Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total

a.b.e.® has a wealth of technical and practical experience built up over the years in the company’s pursuit of excellence in building and construction