THERMOSIL ASBESTOS MILLBOARD

Thermosil Industrial Insulation Millboard (Asbestos)

Product Characteristics

• Is made from a blend of high quality Chrysotile Asbestos Fibre and other non-combustible Ingredients

• Is compactly bound

• Is strong with a smooth surface

• Is available in a wide range of thicknesses to cater to all needs

• Has rigidity as well as flexibility

• Has low thermal conductivity

• Has high temperature resistivity

• Can be easily cut, punched or wet moulded

• Gives clean edges while cutting gaskets

Applications

• A versatile material used for widely divergent applications:

For Insulation:

• In electric arc, induction and other furnaces

• In Boilers and ovens

• In kerosene wick stoves

• In domestic appliances like Electric Irons, Heaters

• In steam and hot air pipelines and ductings

For Automobiles Gaskets

• In cylinder head and exhaust manifold gaskets

For Padding:

• In ball mills

• In expansion joints

• In steel strip industry

For Construction of Roller Conveyors:

• In Sheet Glass Industry

• In Annealing Furnaces

For Fire Safety:

• In Fire-proof Safes and Cupboards

• In Fire-check Doors

For Environmental Safety:

• As covers for ladles, ingots, etc. to protect workmen

• As base mat for placing hot metals in steel & aluminium industries

For Protection of Plant and Equipment:

• As gaskets while pouring Molten Metals in steel & Aluminium industries

• As lining below the mould in the Casting Industry

Specification Compliance

• GOST 2850 : 1958

• JSS 5640-4:1975

• BHEL AA 21525 & PS 21502B

• DGS & D G/ Misc./ 81C

• OFM No. 62.020

• ASTM Classification : F 104F 132000

Available Grades

ALPHA :Commercial grade
TS-101/NE-1001: General purpose grades for high temperature insulation. ( Both grades have similar properties )
TS-301: Superior grade for specialized applications e.g. automobile gaskets, sheet glass roller conveyors, padding in the steel strip industry etc.
AI-111: Single lamination millboard made on a new Fourdrinier machine.
AI-333: Superior grade of single lamination millboard for automobile gaskets- available in rolls or sheets.Single lamination millboard made on a new Fourdrinier machine.
 

Asbestos Paper

• Made from Superior grades of asbestos fibre on Fourdrinier machine.

• User for Electrical and thermal insulation.

• Available in roll form from 0.25- 0.50 mm thickness.

Standard Size

• 1 mtr X 1mtr (other sizes available on request)

• Below1.0 mm in rolls of 1.2 mtrs width

High Density Arc & Heat Resistant Cement Boards (Asbestos)

THERMOSIL High Density Arc and Heat Resistant Boards are manufactured from carefully selected and treated Raw Asbestos Fibre and special grades of cement. The particular properties of the material are obtained by maintaining precision control of the blend, rate of mixing, addition of predetermined quantities of water and chemicals and then compressing the mix into sheet form under extremely high pressure. The sheets are then kept for maturing for several weeks under conditions of controlled humidity and temperature.

Distinctive Properties

THERMOSIL High Density Boards are versatile materials which combine the following distinctive properties not available in any other individual material:

·             Good thermal stability at high temperatures

·             Low contact thermal shock thus eliminating fracture in items like glass components

·             Low thermal conductivity

·             High temperature resistance

·             Good anti-tracking properties

·             High arc resistance

·             Ability to withstand high frequencies

·             High strength even at high temperatures

·             Extremely hardwearing leading to long product life cycle.

·             Easy machineable without splitting or chipping

·             Easy fixing by fasteners or adhesives

·             Suitability as fire check barriers

·             Good alkali resistance

·             Non –metallic thus controlling problem of induced currents

·             Availability in high thickness blocks of up to 100 mm leading to convenient manufacturing of components

·             Non-rusting

Applications

The distinctive properties of THERMOSIL High Density Boards lead to their applications in numerous diverse areas. Some of these applications are:

·             In Arc chutes and deflector plates on air-break circuit breakers, contactors and fuse gear

·             As spacer strips and end packing blocks in distribution transformers

·             For the control and extinction of electric arcs

·             For handling and transferring hot glass components in the moulding areas, conveyor systems and annealing lehrs

·             For manufacture of jigs, dies, moulds, guides, buffer strips, tubes, rods and other machined components

·             As core plates in foundries and in furnaces

·             For insulation of heated plattens in presses

·             For insulation of coils, as top plate or support blocks in induction furnaces

·             As guide strips or splash boards in handling of molten metals on hot castings

·             For transportation of hot metal and pot line insulation in the aluminium industry

·             As fire barriers or fire check doors

Available Grades

UNTREATED:

THERMOSIL High Density Boards are available in the following grades:

HD-31   General purpose natural grade suitable for most of the required applications.

HD-35   Special grade for specific requirements. Only manufactured against order.

TREATED:

The natural grade has high water absorption which can result in unsatisfactory electrical insulation if used in situations where such water absorption can occur. Silicone Resin impregnated material (SR Grade) is recommended for such applications. This eliminates the necessity of coating the edges with varnish after cutting. Silicone Resin has been chosen because it has a higher operating temperature in comparison to other available Resins. The minute pores in the Boards are filled with Silicone Resin, increasing the electrical strength and lowering moisture absorption from 15% to about 1%. There is also some burning of Resin at the point of contact with the arc but this is localized and is self extinguishing.
SR grade does not replace HD grades but is intended for application where superior electrical properties are required such as in arc chutes and barriers for H.V. air break switchgear. SR grade is available in thickness range of 3.2 mm to 38 mm.

THERMOSIL (High Density Arc & Heat Resistant Boards)

TECHNICAL DATA FOR UNTREATED GRADES

Mechanical Properties

Electrical Properties

Thermal Properties

Specification Compliance

HD Grades meet the requirments of: BS 3497: 1979 & IS  4248: 1967 (Class1)
                                                     BHEL AA21516

Sheet Size  1225 X 1080 mm (trimmed).                                         *  Special sizes on request.

Thicknesses Available