LyTherm Ceramic Rollboard

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LyTherm® Rollboard paper is a lightweight refractory material processed from a blend of high purity alumina-silica fibers into a highly flexible, uniform insulation media. It is recommended for continuous use at temperatures up to 2300°F(1260°C).

LyTherm® Rollboard is a utility grade paper that has low shrinkage, good handling strength, and low thermal conductivity. It contains a small amount of organic binder for processing, which makes it flexible, yet reduces off gassing and odor during use. It’s flexibility allows it to be wrapped or rolled to fit most complex configurations.



·        Excellent corrosion resistance

·        Good dielectric strength

·        High fired tensile strength

·        Good flame resistance

·        Easy to cut, wrap, or form

·        Temperature stability

·        Resilient

·        Thermal Shock resistant

·        Low thermal conductivity

·        Low heat storage

·        Light Weight

·        High heat reflectance

Typical Applications

Testing/Engineering Services 

·        Asbestos paper replacement

·        Investment cast mold wrap insulation

·        One-time consumable insulating applications

·        Backup lining for metal troughs

·        Hot top linings

·        Applications where low binder content is required

·        Thermal and electrical insulation

·        Upgrade for fiberglass paper and blanket products

·        Thermal imaging for performance validation

·        Thermal conductivity for material characterization

·        Thermal modeling for engineering solutions



 Physical Properties

Melting Point, °F (°C)

 3200 (1760)

Use Limit, °F (°C)

 2300 (1260)

LOI, %


Density, lb/ft3(kg/m3 )

 10 (160)

Dielectric Strength, V/mil


Mullen Burst, psi


 Chemical Properties %

 Al2 O3




 Na2 O


 Fe2 O3




 Tensile Strength lb/in (kg/25mm)

Machine Direction Tensile

 5.51 (2.46)

Cross Direction Tensile

 5.51 (2.46)

 Apparent Thermal Conductivity

Mean Temperature, °F (°C)

Thermal Conductivity BTU in/hr ft2 °F (W/mK)

75 (167)

 0.300 (0.043)

 177 (350)

 0.390 (0.056)

260 (500)

 0.468 (0.068)

 343 (650)

 0.548 (0.079)


Technical Data Sheet

Lydall - Lytherm Rollboard Paper.pdf