EN 993-3:1997

Overview

EN 993-3:1997 is a European test standard published by CEN that specifies methods of test for dense shaped refractory products containing carbon. The standard applies to refractories based on oxides where carbon is present either in elemental form (for example, graphite) or as carbonaceous binders and additives such as pitch, tar or resin. It was adopted nationally in some countries (e.g., SIST EN 993-3:1998).

This part of the EN 993 series provides harmonized guidance on sampling, conditioning and laboratory test procedures tailored to the specific behavior of carbon-containing dense refractories.

Key Topics

The standard focuses on test methods and practical considerations that reflect the presence of carbon in dense shaped refractories. Key technical topics typically covered include:

• Scope and applicability for oxide-based dense refractories with carbon additions
• Sampling and specimen preparation procedures appropriate for shaped products
• Conditioning and pre-test handling to account for carbonaceous constituents
• Physical property evaluation, including density and porosity assessments
• Mechanical property assessment under relevant laboratory conditions
• Thermal and dimensional stability testing considerations for carbon-containing materials
• Oxidation and chemical resistance aspects related to carbon in the matrix
• Reporting requirements and interpretation of test results for quality control

(EN 993-3 concentrates on test method requirements and does not alter product performance limits - it standardizes how tests are performed and reported.)

Applications

Who uses EN 993-3:1997 and why:

• Refractory manufacturers - to establish and verify quality control testing for carbon-containing dense shaped products.
• Materials and process engineers - when specifying refractories for high-temperature applications where carbon imparts properties such as thermal shock resistance, erosion resistance or conductivity.
• Quality assurance laboratories - to perform standardized, repeatable tests for production acceptance and certification.
• Steel, foundry, glass and non-ferrous industries - where carbon-containing refractories are used in linings, blocks, bricks and specialized shaped components.
• Inspection and certification bodies - for conformity assessment and comparative evaluation of products.

Using EN 993-3 supports consistent test data, helps reduce disputes over product performance, and informs material selection for demanding high-temperature services.

Related Standards

• Other parts of the EN 993 series covering dense shaped refractory products (general requirements and other material-specific parts).
• National and international standards on refractory testing and terminology (CEN/ISO documents and national adoptions).

Keywords: EN 993-3:1997, carbon-containing refractories, dense shaped refractory products, refractory testing, graphite refractories, pitch tar resin, refractory quality control.