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                                                                   Product Information Sheet


Isofrax鈩? 1260C Fibre
Introduction
Isofrax鈩? Thermal Insulation from Unifrax is a revolutionary
new fibre that utilizes a unique, patented silica-magnesia
chemistry to solve a variety of demanding, high temperature
application problems. Isofrax 1260C Fibre is the product of
a long-term research and development effort by Unifrax to
produce a fibre which has the high temperature performance
characteristics required in many applications at temperatures
up to 1260掳C/2300掳F and also meets European and German
regulatory requirements. Isofrax 1260C Fibres provide:
鈥? High temperature stability
鈥? Low thermal conductivity
鈥? Low heat storage
鈥? Thermal shock resistance
鈥? Low weight
Isofrax 1260C Fibre exhibits excellent chemical stability and
Typical Product Properties
resistance to attack from most corrosive agents. Exceptions
include hydrofluoric acid, phosphoric acid and strong alkalies. Colour Bluish White
Isofrax 1260C Fibre also provides superior wetting resistance Melting Point >1500掳C (2730掳F)
to molten aluminum alloys at high temperatures. Temperature Grade 1260掳C (2300掳F)
Recommended Operating Temperature1 1260掳C (2300掳F)
Product Forms Specific Gravity 2.54 g/cm3
Isofrax 1260C Fibre is available in two product forms. The
Isofrax 1260C Fibre has a temperature rating of 1260掳C,
standard Isofrax 1260C Fibre can be utilized in high temper-
but can withstand short-term temperature excursions above
ature applications that require a longer fibre which provides
1260掳C with moderate shrinkage. It is this safety margin which
additional strength to the finished product. Standard Isofrax
allows Isofrax to be used in many demanding applications.
1260C Fibre provides several advantages to the vacuum for-
The following graph illustrates the shrinkage characteristics
mer, including reduced forming times, lower product densities,
of vacuum formed boards using Isofrax 1260C Fibre and
and improved drying times due to the lower weight of the
other high temperature fibres:
finished product.
Isofrax 1260C Chopped Fibre was engineered to provide
the vacuum former with a material which allows formation of Thermal Shrinkage
complex shapes, a smooth surface finish and improved prod- (25mm (1z), 256 kg/m3 (16 pcf) vacuum formed board)
uct details. These two grades of fibre have been developed
10
to provide vacuum formers with an appropriate fibre for a
wide range of finished product forms.
8
% Linear Shrinkage (24 hrs)




Applications
Isofrax鈩?
Isofrax 1260C Fibre can be used in the manufacture of many 6
RCF
high temperature product forms such as felts, boards, papers,
and vacuum cast shapes. This product can also be used Insulfrax鈩?
4
as a high temperature fill or packing material in a variety of
Mineral Wool
applications, such as refractory expansion joints, furnace
base seals, tube seals, and for packaging around burner tiles. 2
Additional applications for Isofrax 1260C Fibre include:
鈥? Reinforcement or fillers in friction materials and composites 0
掳C 538
鈥? Thixotropic agents in coatings and adhesives 760 982 1260 1400
掳F 1000 1400 1800 2300 2552
Temperature
Typical Product Parameters
Isofrax 1260C Fibre is produced on the Unifrax Corporation鈥檚
SEF furnaces which utilize a proprietary mechanical spinning
process and the latest process control technology. This state-
of-the-art manufacturing technology results in the following
typical product parameters for Isofrax 1260C Fibre:
Parameter Isofrax 1260C Fibre Isofrax 1260C Chopped FIbre
Chemical Analysis (%) SiO2 鈥? 72 to 77 SiO2 鈥? 72 to 77
MgO 鈥? 19 to 26 MgO 鈥? 19 to 26
Trace Elements 鈥? 0 to 4 Trace Elements 鈥? 0 to 4
Average FIbre Diameter 3.0 to 4.5 3.0 to 4.5
(microns)
Fibre Index (%)2 40 to 50 40 to 50
Settle Volume3 450 250
Packaging 20 kg or 40 lb. bags 20 kg or 40 lb. bags

Data are average results of tests conducted under standard
procedures and are subject to variation. Results should not
be used for specification purposes. For additional information
about product performance or to identify the recommended
product for your application, please contact the Unifrax
Application Engineering Group at 716-278-3899.

Insulating Value
The following table summarizes the insulating character-
istics of Isofrax 1260C Fibre (note that this analysis is based
on 256 kg/m3 (16 pcf) vacuum formed board produced with
Isofrax 1260C Fibre):
Insulation Thickness 25mm (1z) 51mm (2z) 102mm (4z) 203mm (8z)
Hot Face Cold Face (掳C/掳F) (掳C/掳F) (掳C/掳F) (掳C/掳F)
650掳C (1202掳F) (150/301) (103/218) (71/161) (52/126)
870掳C (1598掳F) (205/401) (142/287) (98/207) (68/154)
1100掳C (2012掳F) (267/511) (187/368) (128/262) (87/189)
All heat flow calculations are based on a surface emissivity factor of 0.90, an ambient temperature of 27掳C (80掳F) and
zero km/h (mph) wind velocity, unless otherwise stated.


Health and Safety Information Notes:
(1) The recommended operating temperature of Isofrax
Isofrax Thermal Insulation from Unifrax, according to
1260C Fibre is determined by irreversible linear change
Directive 97/69/EC, possesses a fibre chemistry within
criteria, not melting point.
the regulatory definition of a 鈥渕an-made vitreous (silicate)
(2) Fibre Index is measured using the conical elutriation
fibre with random orientation with alkaline oxide and alkaline
method.
earth oxide content greater than 18% by weight.鈥? Isofrax
(3) Settle volume is a measurement used to indicate the
fibres have been tested pursuant to EU protocol ECB/TM/26,
physical dimensions (i.e. diameter, length) of a fibre.
Revision 7, Nota Q, Directive 97/69/EC, with results that
A larger number indicates the fibre has larger physical
are below regulatory thresholds. As a result, Isofrax
dimensions, such as diameter and/or length.
Thermal Insulation does not require additional labeling,
further testing or special handling practices. In addition,
Intratracheal Instillation Biopersistence Testing per the
German Hazardous Substance Ordinance has been
conducted on Isofrax fibres with results that are below
German regulatory thresholds. Refer to the product Material
Safety Data Sheet (MSDS) for recommended work practices
and other product safety information.




Form C-1451 English Unifrax Corporation Unifrax GmbH
Effective 1/00
Corporate Headquarters Hanns-Martin-Schleyer-Str. 30
漏1999, Unifrax Corporation
All Rights Reserved 2351 Whirlpool Street 47877 Willich, Germany
Printed in USA
Niagara Falls, New York 14305-2413 Telephone: 49-2154-94780
Page 2 of 2
Telephone: 716-278-3800 Telefax: 49-2154-947810
Data are average results of tests conducted under standard procedures and are subject
to variation. Results should not be used for specification purposes. The following are trade- Telefax: 716-278-3900 Web Address: www.unifrax.com
marks of Unifrax Corporation: Isofrax鈩? Thermal Insulation, Insulfrax鈩?
Web Address: www.unifrax.com Email: info@unifrax.com
Email: info@unifrax.com

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