Centrecoat MMA Joint Seal

Part A: UN1866 (Class: 3, Pk Grp: II), Part B: UN3106 (Class: 5.2)
A two pack, pourable, flexibilised methacrylate sealant suitable for direct pouring into horizontal floor joints.
Available in 1 and 2 Litres in Light Grey. Tintable to RAL numbers upon request.
From £42.48 £35.40
In stock
Only %1 left
Product Description

Centrecoat MMA Joint Seal is a light grey, two pack, pourable, flexibilised methacrylate sealant suitable for direct pouring into horizontal floor joints in warehouses and factories.

Best Uses

Centrecoat MMA Joint Seal is formulated to seal floor joints in food factories and warehouses where heavy vehicular trafficking occurs. Centrecoat MMA Joint Seal is hard and tough enough to protect arris edges from heavy wheel loading, but possesses sufficient flexibility to accommodate a degree of movement (10% of the joint width). Centrecoat MMA Joint Seal is particularly suitable for filling saw cut joints in long strip floor construction.

  • Excellent adhesion to concrete
  • Tough and resilient
  • Suitable for wide joints
  • Highly resistant to water
  • Easy to apply
  • Fast curing, even at very low temperatures
  • Hygienic and easily cleanable

Joint Design
When using Centrecoat MMA Joint Seal, the joints shall be designed to ensure that concrete movement due to shrinkage and temperature fluctuations does not  exceed 10% of the joint width. For joints up to 12mm wide, the depth of sealant should be equal to the width. For joints over 12mm wide the depth of the sealant should not exceed 20mm. Joints over 25mm wide are permissible with Centrecoat MMA Joint Seal.


New concrete floors shall be a minimum of 21 days old. Joint surfaces shall be sound, clean and free from laitance, dust and other contaminants. Joint arrises are best prepared by grinding or power wire brushing, ensuring that all spoil and residual dust is removed by blowing with dry, oil free, compressed air. For best results, prime the joint edges using Centrecoat MMA Joint Seal and allow to cure for a minimum of 45 minutes. Debonding tape should be used in the base of the joints otherwise a polyethylene foam backing strip should be inserted to the appropriate depth.

Centrecoat MMA Joint Seal is supplied as a two pack material consisting of the BASE component, and the CATALYST component. Pour the entire contents of the CATALYST container into that of the BASE component, and thoroughly mix until a uniform consistency has been achieved.

The mixed material may be poured directly into the prepared joints to level. Alternatively Centrecoat MMA Joint Seal may be poured into empty cartridge tubes and gunned into the joints using a sealant gun. It may be necessary to top up to level after a few minutes when the sealant has settled into irregularities.

Clean equipment with Centrecoat MMA Tool Cleaner immediately after use.

Centrecoat MMA Joint Seal will have cured sufficiently after 1 hours cure @ 20°C to allow full trafficking.  Full chemical resistance will be achieved following 24 hours cure @20°C.  At lower temperatures cure times will be increased.  Pre-accelerated grades of the material can be provided for sub-zero application.

Technical Details
Components: Two Pack
Type: MMA
Stock Colours: Light Grey
Tintable: Yes, to most RAL codes. Please note, bespoke tints are non refundable / exchangeable
VOC Content:
Volume Solids:
Suitable Substrates: For concrete floors
Application Method: Sealant Gun
Theoretical Coverage: A 1 litre pack of sealant is sufficient for 10 linear metres with a 10mm x 10mm joint
Wet Film Thickness (WFT):
Dry Film Thickness (DFT):
Induction Time: -
Pot Life: 20 minutes at 20°C
Full Traffic: 1 hour at 20°C
Full Chemical Resistance: 24 hours at 20°C
Cleaner / Thinner: Clean equipment with Centrecoat MMA Tool Cleaner immediately after use.
Shelf Life: Store in dry conditions, out of direct sunlight, at temperatures between 10°C and 20°C. Adequate ventilation of the storage area should be provided. Keep container tightly closed when not in use Centrecoat MMA Joint Seal has a minimum shelf life of 6 months when stored in original, unopened containers in accordance with manufacturer’s instructions.
Packaging: Available in 1 and 2 Litres

The manufacturers data sheets are available for download from this website. It is your responsibility to read and understand all aspects of the data sheets before you place an order and prior to application. Please pay special attention to the preparation, mixing and application temperatures of the product, cleaning of substrate and environmental factors such as temperature, rain etc. Quoted coverage rates are based on the manufacturers theoretical rates and may vary depending upon substrates absorption, texture and application. We always recommend a test is carried out to ensure suitability.

Customer further agrees that Promain have no liability for any errors or omissions contained within the Product Data Sheets and are not liable for failure due to misapplication or inadequate substrate cleaning and preparation. For more information please refer to our Terms & Conditions.

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