ISO 20182:2008

Overview

ISO 20182:2008 is an international standard developed by the International Organization for Standardization (ISO) that specifies the procedure for preparing refractory test panels using pneumatic-nozzle mixing type guns at ambient temperature. It focuses on the gunning process to create test-pieces from refractory materials, crucial for evaluating physical properties in materials testing. This standard excludes plastic gunning mixes, shotcrete type mixes, and mixes containing aggregates susceptible to hydration.

ISO 20182:2008 ensures consistency and accuracy in the preparation of refractory panels, enabling reliable testing outcomes crucial for industrial applications involving refractory materials used in high-temperature environments.

Key Topics

• Scope and Application
  Defines the preparation of refractory test panels by pneumatic-nozzle mixing guns at ambient temperatures, excluding plastic gunning mixes and shotcrete. Specifies that values obtained may differ from those of materials prepared on site.

• Equipment Requirements
  Covers the necessary appareillage, such as pneumatic mixing guns with compatible nozzles, air compressors, mixers, air and water pressure indicators, and suitable rigid support plates for receiving the gunned material.

• Test Panel Preparation Method
  Details the process of transporting refractory material pneumatically, water introduction at the nozzle, and projection onto support plates. Includes parameters such as air and water pressure levels, panel dimensions (minimum 280 mm × 280 mm × 100 mm), and angle of application (60° to 80°).

• Sampling and Mix Handling
  Emphasizes the importance of correct sampling per ISO 8656-1 and use of whole material bags. Pre-wetting recommendations vary by refractory type (dense or insulating), with typical pre-wetting water content ranging from 2%-5% to 5%-12%.

• Testing Conditions and Controls
  Measures such as pH determination of water, material and ambient temperatures, and controlling rebound (material refusal to adhere) to ensure reproducibility. The standard includes permissible variations and recommended operator practices.

• Post-Processing and Reporting
  After projection, panels are cured typically at 20°C-25°C for 24 hours or longer under controlled humidity. Test specimens are obtained by cutting panels, with specific orientation relative to the gunning direction. A comprehensive test report is required, detailing material lot, equipment conditions, process parameters, and any anomalies or deviations.

Applications

ISO 20182:2008 is highly valuable for industries engaged in:

• Refractory Material Testing - providing standard test specimens for quality control, research, and product certification.
• High-Temperature Furnace and Kiln Maintenance - assessing the suitability of gunning mixes used for repair or construction of refractory linings.
• Material Development and R&D - enabling consistent test-piece preparation techniques for evaluating new refractory compositions and formulations.
• Quality Assurance in Production - ensuring repeatability and comparability across batches and suppliers through standardized panel preparation.

This standard supports manufacturers, testing laboratories, and end-users in achieving reliable and reproducible refractory material properties essential for performance in harsh industrial environments.

Related Standards

• ISO 836: Terminology of Refractory Materials
  Provides foundational terminology used in understanding ISO 20182 testing procedures.

• ISO 8656-1: Sampling of Raw and Unshaped Refractory Materials-Part 1: Sampling Schemes
  Offers guidelines on proper sampling techniques critical for preparing representative test samples.

• Other Refractory Testing Standards
  Users of ISO 20182 often reference complementary standards for mechanical strength, thermal shock resistance, and chemical analysis to form a complete assessment of refractory material quality.

Keywords: ISO 20182:2008, refractory test-piece preparation, pneumatic-nozzle mixing guns, gunning refractory panels, refractory materials testing, refractory panel preparation, test procedures, refractory equipment, refractory sampling, refractory mix handling, refractory panel test, refractory quality assurance.