Protos Ultrabloc

Multifilament para-aramid yarn for fibre optic cables

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Coats Protos Ultrabloc is two to three times more water absorbent than other yarns of its kind, thanks to its unique coating. It also offers some of the lowest dusting and shedding in the fibre optic industry. This helps reduce machine downtime and improves cleanliness and safety during cable manufacture.

Protos Ultrabloc is a super absorbent, water-swellable coated para-aramid yarn for use in cable strength members and water-blocking binders.

Available in both standard modulus (Type A) and high modulus (Type B).

Discover how Protos Ultrabloc can transform your products. Download our product information sheet or by contact one of our experts.


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.