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102.jpg (3709 bytes)  Castertip Type NKO

ZIRCAR Castertip Type NKO is a rigid combination of refractory ceramic fiber and inorganic binders. This high strength, low mass refractory material is a main stay "low mass hard tip" used on continuous thin strip aluminum casting equipment.

NKO is a high strength material designed with multiple uses on continuous thin strip aluminum casting equipment. NKO is completely inorganic and exhibits excellent non-wetting properties. Possessing smooth surfaces and uniform consistency, it is compatible with many refractory coatings including boron nitride and refractory ceramic fiber paper linings.

Standard NKO is offered in nominal 40 pcf density in the form of a sheet. It is easily shaped with common wood working tools to yield castertips, baffle boards and other shapes.

Custom NKO is commonly supplied as a pre-shaped castertip that need not be ground to its final contour directly on the caster rolls. It's low thermal conductivity and excellent hot strength make it a superior product for casting thin gauge aluminum alloys.


Typical Composition, wt % 





< 0.25


< 0.05


< 0.05

Loss on Ignition, %


Surface Area, m/g


Density, g/cc (pcf)

0.64 (40)

Modulus of Rupture**, MPa (psi)

3.1 (450)

Hardness, average, A scale


Linear Shrinkage, %  
    24 hrs at 800C (1472F) 0.4
    24 hrs at 1000C (1832F) 2.2


Properties expressed parallel to thickness

Properties expressed perpendicular to thickness


Castertips, end dams and baffle boards for continuous casting of aluminum strip.

Launders, distribution boxes, pouring spouts, hot tops and other shapes involving molten metal contact.

Backup thermal insulation in furnaces and thermal process systems operating to high temperatures.

High temperature setters, supports and process fixtures.

Thermal insulation in hot appliances.

msds.jpg (1069 bytes)MATERIAL SAFETY DATA SHEETmsds.jpg (1069 bytes)


 Custom fiberglass mesh re-enforcement incorporated in Castertip body

 Castertips in case ready for shipment.

Custom boards, shapes, such as castertips, and other preparations are available on request. Our forming processes, large inventory of custom tooling and state of the art machining techniques allow a wide variety of sizes and shapes to be made. Special geometries such as disks, rings and custom-machined shapes and others can be fabricated. Tight tolerance machining, compositional variations and the application of surface rigidizers and hardening agents are available.

Custom Castertips can be made to fit virtually every style of twin roll caster. In house mold making capabilities are waiting to be put to work on the profile tip you require. The following are a few of the profiles available. Click on the listing for more information.

Profile 3 Profile 4 Profile 6 Profile 7
12.875" Radius 19.5" Radius 22.047" Radius 30.844" Radius

Please contact us with your special requirements. We are pleased to contact you if you would like more information or want to discuss custom product availability and pricing. 

To Order

Custom castertips:  specify quantity, product type, profile, width and depth. Example: 50ea, NKO, Profile 6, 60in.W x 14.25 in.D.

Custom boards: specify quantity, product type and size. Example: 12ea, NKO, 12in.W x 31.5in.L x 1.2in.T

Custom boards, shapes and preparations: specify quantity, product type and description (by supplying drawings, sketches, written descriptions or material specifications).

Copyright 2002  ZIRCAR Ceramics, Inc.