Coats Ultrabloc F

Ultrabloc F

Superior tensile strength compared with other water blocking yarns in the market

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Coats Ultrabloc F has been designed to reach the top level of swellable power yarns.

Made from a 1st quality high tenacity polyester fibre and a last generation super absorber polymer, this yarn has superior tensile strength compared with other water blocking yarns in the market.

The main characteristic for Ultrabloc F is its immediate reaction against water. We have incorporated several new yarns with low weights: 33, 43 and 67 tex. These yarns can be manufactured in several sizes and wound on cardboard tubes based on customer requirement.

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Features and Benefits

  • Flat yarns with regular and continuous width and thickness. This allows them to be incorporated inside the buffer tube for dry/dry cable designs
  • Smooth coating, does not create any interference in cable surface
  • First quality raw material
  • Few dust during manipulation
  • Non-conductive material
  • Excellent swelling values compared with other water blocking yarns
  • Fast reaction against water


Since conditions and applications vary considerably in the use of a product, the customer and/or user should assure herself or himself that the product meets end customer requirements and is suitable for the intended end use. Coats accepts no liability for unsuitable or improper use or application of products.

Information provided above is based on current averages and should be taken only as indicative. Coats accepts no liability for the preciseness and correctness of the information provided.

Product information sheets are updated from time to time, please be sure you are referring to the most recent publication. Coats supports customers with advice on individual applications on request; if you have any questions or concerns, please contact us.