Alumina-silica yarns, sewing threads, woven fabrics, woven tapes and sleeving braids

Alumina-silica yarn is made up of thousands of filaments, giving it excellent flexibility and stability for transformation into textiles, without the aid of other organic or metal fibres.

Products include 2- and 3-ply yarns, hand and machine sewing threads, rope and cord, woven fabrics, woven tapes and braided sleeving.

We supply the full range of NITIVY ALF® alumina-silica products

NITIVY ALF is a boron-free alumina-silica fibre that is composed of Al2O3 72% and SiO2 28%, which is commonly known as a representative stable metal oxide material. NITIVY ALF is a polycrystalline filament whose crystal type is gamma alumina and amorphous silica with a fine filament diameter of 7 micron.

Textile properties include good chemical resistance, thermal shock resistance and superior electrical insulation properties. They are also corrosion-resistant and do not absorb moisture. NITIVY ALF is inherently colourless, but can be coloured with inorganic pigment red, black and blue. Pigments are stable up to 700/800°C.

There is a growing interest in NITIVY ALF filament yarn for use in a wide range of applications which require high temperature operation environments.

NITIVY ALF product details and specifications

View details and specifications of our range of alumina-silica products.

Characteristics & applications of NITIVY ALF alumina-silica fibre

Alumina-silica properties

Colour and form
White, continuous filament
Chemical composition
72% Al2O3 / 28% SiO2
Tensile strength
Tensile modulus

Alumina-silica applications

  • Thermal insulation rings (discs and collars) for diffusion furnaces used in the semi-conductor manufacturing process
  • Furnace linings
  • Heat-shielding curtains
  • Thermal insulation seals or packing materials
  • Thermal insulation coverings for thermocouple cables and wires
  • Roller covers for tempered glass plate manufacturing
  • Filters for molten aluminium or other metals
  • Spacers for the heat treatment of metal or other materials
  • Abrasive for plastic wetstone
  • Insulators around generator and aircraft/rocket engines
  • Catalyst carriers
  • Electrical and thermal insulators for diesel particulate filter systems (DPF)
  • and many others…

NITIVY ALF is a trademark of Nitivy Co. Ltd. in Japan and other countries.

Contact us

To place an order or request further information on NITIVY ALF alumina-silica products, please call +44 (0) 1538 385888, email, or complete the enquiry form.