GB/T 5990-2021 (English Version) PDF

Scope: This document describes the test methods for the determination of the thermal conductivity of refractory materials by the cross-hot wire method and the determination of the thermal conductivity, thermal diffusivity and specific heat capacity of refractory materials by the parallel hot-wire method. The cross hot wire method is suitable for measuring carbon-free refractory materials with a temperature not greater than 1250 ℃, a thermal conductivity of less than 1.5 W/(m·K), and a thermal diffusivity not greater than 5×10-6 m2/s. The parallel hot wire method is suitable for measuring non-conductive refractory materials with a temperature not greater than 1250 ℃ and a thermal conductivity less than 25 W/(m·K). This document also applies to powdered and granular refractory materials. Note 1: The thermal conductivity of unfired bricks and monolithic refractory preforms is affected by the dehydration of residual water after hardening or solidification during heating, and the samples can be pretreated. Details such as the method and degree of pretreatment and the holding time of the sample when measuring the temperature are beyond the scope of this document and must be agreed upon by both parties. Note 2: It is generally difficult to measure heterogeneous materials, especially materials containing fibers. The measurement of such materials using this method is agreed by both parties.

GB/T 5990-2021 Referenced Document

GB/T 10325 "Shaped refractory products—Rule of acceptance,sampling and inspection"
GB/T 4513.5 Monolithic (unshaped) refractory products—Part5： Preparation and treatment of test pieces
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

2021 GB/T 5990-2021 Refractory materials—Determination of thermal conductivity, specific heat capacity and thermal diffusivity(hot-wire method)
2006 GB/T 5990-2006 Refractory materials. Determination of thermal conductivity. Hot-wire method
1986 GB/T 5990-1986 Shaped insulating refractory products--Test method of the thermal conductivity (hot wire method)

$Refractory materials—Determination of thermal conductivity, specific heat capacity and thermal diffusivity(hot-wire method)$