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Professional Terms for Refractory Materials 4

Nov 08, 2023

091. no cement castable /NCC

Deflocculated castable (050) without hydraulic cement.

092 open crack open crack

Cracks or cracks on the surface of refractory products with a length greater than 10 mm and a width greater than 0. 2 mm.

093. open pores

Under specified test conditions, the pores of the refractory material (108) sample immersed in the liquid can be filled by the liquid. Note: In principle, these pores are directly or indirectly connected to the atmosphere.

094. organic bond organic bond

A combination formed by hardening of organic matter at room temperature or slightly higher temperature (013).

095. Breathability permeability

The performance of refractory materials (108) in allowing gas to pass under a certain pressure difference, usually expressed in terms of air permeability.

096. Permanent change in dimensions on heating/permanent linear change/PLC

The linear expansion or contraction that remains after the refractory material (108) is heated to a specified temperature without external force, kept warm for a certain period of time, and cooled to normal temperature.

097. Pitch/tar bonding

Bond (013) created by bitumen/tar in pressed non-burn refractory material (108).

098. Pitch impregnation is a process in which liquid asphalt or tar is infiltrated into refractory products after molding or firing (060).

099. Plastic refractory/mouldable refractory

It is an unshaped refractory material (138) that is composed of aggregate (003), fine powder (059), binder (010) and liquid, has good working performance (141), is heated and hardened after construction, and can be used directly according to the delivery status. Note: Refractory plastics are usually delivered in pre-made soft strips and blocks, and are constructed using mechanical or manual pounding methods.

100. pre-formed shape

The unshaped refractory material (138) is poured or molded into a certain shape and pre-treated to facilitate direct masonry.

101. Refractory ceramic fiber hard products pre-formed shape (rigid)/pre-formed rigid ceramic fiber

Hard block products made of refractory ceramic fibers (026) added with inorganic or organic binders (010) with or without heat treatment.

102. Concave-convex Protrusion/Indentation

Uneven defects on the surface of refractory products produced during the pressing or firing process.

103. pyrometric cone equivalent/PCE

The cone number of the standard temperature measuring cone (104) is used to indicate the refractory resistance of the refractory material sample (110). The method is to place the standard temperature measuring cone and the sample cone of two adjacent cone numbers on the frustum at the same time. Heating under specified conditions, compare the consistency of the bending degree of the sample cone and the standard temperature measuring cone to determine the cone number of the sample cone.

104. Standard temperature measuring cone pyrometric reference cone/cone

A truncated oblique triangular pyramid with edges of a specific composition and specified shape and size, which can be installed and heated under specified conditions, and when the set temperature is reached, its cone bends in a determined manner.

105. ramming

Construction method of repeatedly impacting unshaped refractory materials (138) into shape.

106. ram mix/ramming mix

It is an unshaped refractory material (138) composed of aggregate (003), fine powder (059), binder (010) and necessary liquid. It has no adhesion before use and is constructed by pounding (105) method. Note: Use the ramming material in the delivery state or after adding liquid.

107. (Standard temperature measuring cone) reference temperature/temperature of collapse

When the standard temperature measuring cone (104) placed on the frustum is heated at the specified heating rate under specified conditions, the temperature at which the cone tip bends to the frustum surface.

108. Refractory (n)/refractory product/refractory material

Refers to non-metallic materials whose physical and chemical properties are suitable for use in high-temperature environments, but it does not rule out that some products may contain a certain amount of metallic materials.

109. Refractory castable castable

A non-adhesive mixture consisting of aggregate (003), fine powder (059) and binder (010). It is usually delivered in a dry state and can be poured (024) after being mixed with water or other liquids.

110. Refractoriness refractory materials (108)

The ability to resist high temperatures without melting under no load conditions.

111. Softening temperature under load/R-U-L

The temperature at which the refractory material (108) undergoes specified deformation under a constant load under specified heating conditions.

112. Regular castable

Refractory castables (109) containing cement, hydration bonding (074), and not containing deflocculant (049), the calcium oxide content (mass fraction) introduced by the cement is greater than 2.5%.

113. resilience

The ability of refractory ceramic fiber (026) products to return to their original shape after being compressed by 50%. Note: Resilience is the ratio of the thickness of the refractory product to the initial thickness after the pressure is applied to compress the product to 50% of the original thickness.

114. resin bonding

Refractories containing resin (018) are heated at lower temperatures (below 800°C) due to the bonding produced by the resin (013).

115. resistance to acid

The ability of refractory materials (108) to resist acid attack. It is usually expressed as the percentage of mass loss after the material is etched in a specified acid.

116. segregation

During the production process of refractory materials (108), aggregates or fine powders are concentrated due to the separation of aggregates (003) and fine powders (059).

117. shaped insulating product

Shaped refractory materials (109) with true porosity (135) not less than 45%.

118. shot content

The percentage of the non-fibrous material in the refractory ceramic fiber (026) that passes through the 75 μm standard sieve to the total amount of the sample.

119. Silica refractory

The silica content (mass fraction) is not less than 93% of refractory materials with natural quartzite as the main raw material (108).

120. siliceous refractory

Refractory materials with a silica content (mass fraction) of not less than 85% and less than 93% (108).

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