NITIVY ALUMINA FIBRE (ALF)
About NITIVY ALF™
NITIVY ALF™ is continuous Alumina Fibre that was developed using Nitivy’s vinylon(PVA fibre) dry spinning technology.
NITIVY ALF™ is Boron-free Alumina-Silica fibre that is composed of Al2O3 72% and SiO2 28%. Al2O3 and SiO2 are commonly known as representatives of stable metal oxides.
NITIVY ALF™ is a polycrystalline filament whose crystal type is gamma alumina and amorphous silica. The yarn is made up of thousands of fine filaments with a diametre of 7micron, which gives it excellent flexibility and allows it to be transformed into various textiles without the aid of other fibres or wire inserts.
Fabrics,tapes,sleeves,sewing thread and cordage are typical products. At present, there is a growing interest in NITIVY ALF™ filament yarn for use in a wide range of applications which require high temperature operating environments.
Characteristics
1) Excellent thermal resistance.
NITIVY ALF™ retains strength and flexibility in continuous high temperature environments.
2) Great flexibility for the making of textiles.
3) High tensile strength and modulus.
4) Resists corrosion.
5) Superior electrical insulation properties.
6) Does not absorb moisture.
7) Superior thermal insulation properties.
Applications
1) Furnace linings.
2) Heat-Shielding curtains.
3) Roller covers for toughened glass operation.
4) Abrasives for plastic whetstone.
5) Spacers for the heat treatment of metal or other materials.
6) Thermal insulation coverings for the thermocouple, cable and wire.
7) Filters for molten aluminium or other materials.
8) Thermal insulation rings(disks and collars)for diffusion furnaces used in the semi-conductor manufacturing process.
9) Insulators around generator and aircraft/rocket engines.
10) Electrical and thermal insulators for diesel particulate filter(DPF)system.
11) Thermal insulation seals or packing materials.
12) Others.
Summary of Nitivy ALF
Standard Sewing Thread Products
Standard Rope, Cord Products｜Standard Woven Fabric Products
Standard Woven Tape Products｜Standard Braided Sleeving Products
Customized Products
Standard Sewing Thread Products
| Type | Yield (tex) | F.D (μmφ) | Twist (T/m) | Quantity (g/bobbin) | Length (m/bobbin) | O.D* (mmφ) | NOTE |
| T-5760D | 620 | 7 | 170 | 400 | 645 | 1.0 | Hand sewing |
| CT-2560D | 330 | 7 | 180 | 350 | 1,060 | 0.5 | Machine sewing |
| CT-5120D | 660 | 7 | 180 | 350 | 530 | 0.8 | Machine sewing |
Standard Rope, Cord Products
| Type | Form | O.D* (mmφ) | Twist (t/m) | Weight (g/m) | Length (m/bobbin) | Quantity (g/bobbin) |
| RP-18 | Twisted rope | 2 | 100 | 3.8 | 130 | 500 |
| CD-2 | Braided cord | 2 | – | 3.7 | 50 | 185 |
| CD-3 | Braided cord | 3 | – | 5.4 | 50 | 270 |
＊Note ：F.D=Filament diametre, O.D=Outside diametre
＊Note ：Out side diametre “O.D”mentioned in the tables are just for preliminary knowledge
Standard Woven Fabric Products
| Type | Weave | Yield of yarn (tex) | Yarn count(per inch) | Weight (g/m2) | Thickness(mm) | ||
| Warp | Fill | JIS | ASTM | ||||
| 3025-T | Twill | 200 | 30 | 25 | 440 | 0.35 | 0.55 |
| 1111-P | Plain(mesh) | 620 | 11 | 11 | 550 | 0.68 | 0.87 |
| 0909-P | Plain(mesh) | 200 | 9 | 9 | 145 | 0.21 | 0.41 |
| 2626-P | Plain | 133 | 26 | 26 | 280 | 0.21 | 0.31 |
| 2525-P | Plain | 67 | 25 | 25 | 135 | 0.12 | 0.21 |
| 2220-S | Satin | 400 | 22 | 20 | 670 | 0.61 | 0.97 |
| 4018-D | Double twill | 400 | 40 | 18 | 940 | 0.80 | 1.35 |
＊Applied standard to measure thickness (JIS: JIS R3420, ASTM: ASTM D1777).
＊Standard woven fabric products are all 1m width and 30m/roll.
Standard Woven Tape Products
| Type | Weave | Yield of yarn (tex) | Yarn count (per inch) | Weight (g/m2) | Thickness(mm) | Width (mm) | ||
| Warp | Fill | JIS | ASTM | |||||
| TP-25S | Twill | 200 | 30 | 22 | 11 | 0.32 | 0.53 | 25 |
| TP-25D | Twill | 600 | 48 | 11 | 37 | 1.20 | 1.87 | 25 |
| TP-30S | Plain | 200 | 30 | 22 | 13 | 0.32 | 0.45 | 30 |
| TP-50S | Plain Twill | 200 | 30 | 22 | 22 | 0.32 | 0.45/0.53 | 50 |
＊Standard woven tape products are all 30m/roll.
＊Applied standard to measure thickness(JIS:JIS R3420,ASTM:ASTM D1777).
Standard Braided Sleeving Products
| Type | Yield of yarn (tex) | I.D (mm) | Weight (g/m) | Picks | Quantity(m/roll) |
| SV-1-XP | 33 | 0.3 | 0.7 | 16 | 50 |
| SV-1-SP | 67 | 0.5 | 1.3 | 16 | 50 |
| SV-1 | 133 | 1 | 2.4 | 16 | 50 |
| SV-2 | 200 | 2 | 3.7 | 16 | 50 |
| SV-6 | 6 | 12 | 24 | 50 | |
| SV-12 | 12 | 24 | 48 | ab.25 | |
| SV-16 | 16 | 38 | 64 | ab.25 | |
| SV-20 | 20 | 44 | 84 | ab.25 | |
| SV-40 | 40 | 91 | 96 | ab.40 | |
| SV-60 | 60 | 182 | 96 | ab.50 | |
| SV-85 | 400 | 85 | 333 | 96 | ab.40 |
| SV-95 | 95 | 390 | 96 | ab.30 |
＊Please contact us if you have special requests or enquiries regarding length or quantity.
Customized Products
・Chopped Yarn : Cut into hoping seizes(1-50mm).
(We recommend using this for reinforcement.)
・Packings : round(5-40mmΦ), square(4-40mm).
・Coloured Yarn : Coloured with inorganic pigment(red, blue, black).
(Not lose its colour even at high temperature.)
・High Purity Grade ALF
Note ：Please contact us if you have any requests or enquiries regarding ALF customized products.
Typical Properties
| Item | Type | ALF |
| Colour | Colourless | |
| Appearance | Continuous | |
| Filament diametre (μｍ) | 7 | |
Chemical composition(％) | Al2O3 | 72 |
| SiO2 | 28 | |
| Density(g/cm3) | 2.9 | |
| Crystal phase | γ-Al2O3 | |
| Tensile strength(kgf/mm2) | 200 | |
| Tensile modulus(kgf/mm2) | 17,000 | |
・Please contact us if you have special requests regarding chemical composition.
・Suggested service temperature for use is just for preliminary knowledge and is not guaranteed.
・It is necessary to do trials in the actual atmosphere of your facility before developing specifications.
Strength retention after exposure to high temperature
Bending resistance comparison of filament diametre
Thermal Insulation Rings
The thermal insulation rings were developed as thermal insulator for diffusion furnace, CVD equipment, etc in semi-conductor manufacturing process at temperature of up to 1,300℃.
The thermal insulation rings are high quality hand-made products that are fabricated with a combination of ALF™ textiles as outer material, ceramic fibre products(mainly the blanket and board)as inner material and ALF™ sewing thread.
The thermal insulation rings are designed in accordance with customers’ specific requests in order to fit various quartz or silicon carbide tubes in the furnace.
There are two types of thermal insulation rings. One type is regular grade. The other type is high purity grade. At present insulation rings gradually are going toward high purity grade type.
ALF™ textiles and ceramic fibre products are sized by organic resins.We do“heat cleaning”for thermal insulation rings before we send them to your factory in order to avoid contaminating your furnaces.
Characteristics
1) Long life for using ALF™ fabrics (compared with silica or quartz).
2) High energy saving because of excellent sealing capability.
3) Reduced contamination.
4) No vaporized substances at high temperatures(ALF™ is Boron-free Alumina-silica fibre).
5) Availability of fabricating various forms for customer’s specific requests.
6) Reduced downtime.
7) Smooth temperature profile.
Composition of Materials
HIGH PURITY | STANDARD | |
Outer insulation Material | Alumina-cloth HG-3025-T | Alumina-cloth 3025-T |
Inner insulation material | Ceramic Fibre HP Blanket Ceramic Fibre HP Board CeramicFibre HPHardenedBoard | Ceramic Fibre Blanket Ceramic Fibre Board CeramicFibre HardenedBoard |
Sewing Thread | Yarn HG-T-5760D | Yarn T-5760D |
Strings | Braided Sleeve HG-SV-4 | Braided Sleeve SV-4 |