Sigma Test and Research Centre : Laboratory Testing,Quality Control,Testing Services
    • Refractory Testing

Creep Test:

Creep testing of materials at high temperatures is a very important field of study at many levels of industry.  Accurate high temperature creep data is absolutely essential for the proper design and construction of any structural element operating at elevated temperatures.  As such, ways of improving upon conventional creep testing methods at high temperature are highly sought after.
Test Method: IS: 1528 (P-18)1993

Permanent Linear Change:

This test helps in determining the critical linear markings and measurements in green condition, after drying and after firing. The permanent change in dimensions is measured as permanent linear change.
Test Method: IS: 1528 (P-6)1974

Pyrometric Cone Equivalent:

This test helps in determining the fireclay variations, mining control, and developing raw material specifications.
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Refractories Under Load:

This test helps in determining the deformation behavior of refractory ceramic products subjected to a constant load and increasing temperature.
Test Method: ISO 1893

Abrasion Test:

This test helps in determining the relative abrasion resistance of refractory brick at room temperature. This test method can also be applied to castable refractories.
Test Method:

Air permeability Test:

This test helps in determining the measurement of the air permeability of textile fabrics. This test method applies to most fabrics including woven fabrics, nonwoven fabrics, air bag fabrics, blankets, napped fabrics, knitted fabrics, layered fabrics, and pile fabrics. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.
Test Method:

Petrographic analysis by Optical Microscopy:

This test helps in determining the the microscopic analysis of materials using thin sections or polished surfaces.
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Acid Resistance Test:

This test helps in determining the acid resistance capacity of the refractory material.
Test Method: IS: 4860-1968

Thermal Conductivity:

Thermal conductivity depends upon the chemical and mineralogical compositions as well as the glassy phase contained in the refractory and the application temperature. The conductivity usually changes with rise in temperature. In cases where heat transfer is required though the brick work, for example in recuperators, regenerators, muffles, etc. the refractory should have high conductivity. Low thermal conductivity is desirable for conservation of heat by providing adequate insulation.
Test Method: IS: 1528 (P-16)1991

Particle Size:

This test helps in determining the percentile quantity of particles of known diameter within a sample. The specimen can be either passed through a set of standard sieves in its natural state, or if a significant amount of binding material is present, such as clay, then the sample can first be washed over a small aperture sieve to remove the binding material.
Test Method: IS: 1528 (P-14) 1974

Water absorption:

The amount of water that a refractory can absorb is measured by the water absorption test. The results of water absorption tests are used for quality assurance.
Test Method: IS 3495 (P-2)1992

Apparent Porosity:

Apparent porosity, water absorption, apparent specific gravity, and bulk density are primary properties of burned refractory brick and shapes. These properties are widely used in the evaluation and comparison of product quality and as part of the criteria for selection and use of refractory products in a variety of industrial applications.
Test Method: IS: 1528 (P-8)1974

Cold Crushing Strength:

This test helps in determining the strength of a brick. It tells us how much load that refractory can bear in cold conditions. The concept of testing CCS of a refractory material has perhaps, come from metallurgy. This is because for any refractory brick it is rather; rare that it would fail simply due to load on it in cold condition and therefore, the determination of cold crushing strength does not appear to be important from that point of view.
Test Method: IS: 1528 (P-4)1974

Bulk Density:

A useful property of refractories is bulk density, which defines the material present in a given volume. An increase in bulk density of a given refractory increases its volume stability, its heat capacity, as well as resistance to slag penetration.
Test Method: IS: 1528 (P-12)2009

Modulus of Rupture:

The modulus of rupture (MOR) is the maximum surface stress in a bent beam at the instant of failure. One might expect this to be exactly the same as the strength measured in tension, but it is always larger because the volume subjected to this maximum stress is small, and the probability of a large flaw lying in the highly stressed region is also small.
Test Method: IS: 1528 (P-5)1993, IS: 1528 (P-15)1991

Dimensional check:

Refractory materials must maintain dimensional stability under extreme temperatures (including repeated thermal cycling) and constant corrosion from very hot liquids and gases. The standard for refractory materials restricts compressive creep (deformation at a given time and temperature under stress) for normal working conditions to no more than 0.3 percent in the first 50 hours.
Test Method: IS: 1077-1992, IS: 10570-1983