Inorganic hardeners

Hardeners are intended for processing mullite silica glass fibre refractory materials and products based thereon, refractory ceramic fibre in order to increase their surface resistance to mechanical abrasion, to erosion from gas flows, when interacting with molten non-ferrous metals with an application temperature of up to 1,300 °C.
Inorganic hardeners

Physical and chemical parameters

Parameter name

ONT-I

ONT-II

ONT-III

Application temperature, °С 

1300

1260

1300

PH of liquids, pH unit value

1-5

8-11

-

Density, g/cm3, within

1,5-1,7

1,1-1,3

-

The "-" sign means that the indicators are not standardized.

The hardeners are not interchangeable. ONT-I, ONT-II, ONT-III are intended for all products of Kao-, Cera-, mullite-siliceous glass fiber heat-insulating refractory materials and products based thereon manufactured by Sukhoy Log Refractories JSC.

The ONT-I and ONT-II grade hardeners are transported at an ambient temperature of not lower than +2 °C; for the ONT-III grade hardener, there is no temperature limitation during transportation.


Regulatory documentation: STO 05802307-1-005-2023

Contact us

How to order

To place an order for the product supply, please do the following:
  1. On your company's letterhead, fill out an application, which shall include:
    • name of the requested product (or technical specifications thereof),
    • required amount,
    • estimated delivery time,
    • contact details.
  2. When ordering non-standard products (according to drawings), please attach the drawings of the requested product and indicate the dimensional tolerances.
  3. The completed application and drawings can be sent:
    • by email: tdom@slsoz.ru
    • by fax: (34373) 64 3 42; 64 4 63
    • or use the feedback form on the right

Write us

Contact us with any questions or place an order using the form. To place an order for the product supply, please do the following:

1. On your company's letterhead, fill out an application, which shall include:

    •  name of the requested product (or technical specifications thereof)

    •  required amount

    •  estimated delivery time

    •  contact details. 

2. When ordering non-standard products (according to drawings), please attach the drawings of the requested product and indicate the dimensional tolerances.