ASTM C416-97(2022)
(Classification)Standard Classification of Silica Refractory Brick
Standard Classification of Silica Refractory Brick
SIGNIFICANCE AND USE
3.1 The presence of certain impurities in silica brick tends to lower their refractoriness and service limits. This classification permits those familiar with refractories to predict the refractoriness of silica brick from their alkali and alumina contents.
SCOPE
1.1 This classification is limited to silica brick meeting the following requirements:
1.1.1 Alumina (Al2O3) content of less than 1.50 %.
1.1.2 Titania (TiO2) content of less than 0.20 %.
1.1.3 Iron oxide (FeO3) content of less than 2.50 %.
1.1.4 Calcium oxide (CaO) content of less than 4.00 %.
1.1.5 Average modulus of rupture of not less than 500 psi (3.45 MPa).
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Aug-2022
- Technical Committee
- C08 - Refractories
Relations
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Aug-2008
- Effective Date
- 01-Aug-2008
- Effective Date
- 10-Apr-2003
- Effective Date
- 01-Jan-1997
Overview
ASTM C416-97(2022): Standard Classification of Silica Refractory Brick is a widely recognized international standard established by ASTM International. This classification system provides rigorous guidelines for evaluating and categorizing silica refractory bricks based on their chemical composition and mechanical properties. The presence of impurities in silica bricks, particularly alkali and alumina content, can significantly affect their refractoriness and service limits. By defining clear parameters, ASTM C416 assists industries in predicting the performance, quality, and suitability of silica bricks for various high-temperature applications.
Key Topics
- Chemical Composition Requirements:
- Alumina (Al₂O₃) content must be less than 1.50%
- Titania (TiO₂) content must be less than 0.20%
- Iron oxide (Fe₂O₃) content must be less than 2.50%
- Calcium oxide (CaO) content must be less than 4.00%
- Mechanical Property:
- Average modulus of rupture not less than 500 psi (3.45 MPa)
- Flux Factor Classification:
- Type A: Flux factor of 0.50 or less, indicating higher purity and refractoriness
- Type B: All other silica bricks in the defined scope
- Testing Methods:
- Chemical analysis using X-ray fluorescence (XRF) and inductively coupled plasma (ICP)
- Modulus of rupture tested according to ASTM C133
Applications
Silica refractory bricks, classified under ASTM C416, play a critical role in industries where high-temperature resistance and chemical durability are essential. Key application areas include:
- Steel and Glass Manufacturing: Silica bricks are extensively used to line furnaces, as they endure high temperatures and aggressive environments without significant deformation.
- Cement and Lime Kilns: The bricks provide excellent load-bearing capability and resist slag and flux attack.
- Thermal Insulation: Their thermal stability makes them suitable for insulating layers in industrial ovens and kilns.
- Incinerators and Power Plants: Used as part of the refractory lining, ensuring safe and efficient operation of combustion chambers.
Their precise classification per ASTM C416 ensures that only silica bricks with specified impurity levels and mechanical strength are selected for the most demanding service conditions, contributing to operational longevity and safety.
Related Standards
The ASTM C416-97(2022) standard references key documents and works in synergy with other ASTM and international standards relevant to refractories and silica bricks, such as:
- ASTM C133: Standard Test Methods for Cold Crushing Strength and Modulus of Rupture of Refractories
- Chemical Analytical Techniques: Standards involving XRF and ICP methods
- World Trade Organization (WTO) TBT Principles: Alignment with international best practices ensures broad global applicability
Practical Value
Adopting ASTM C416-97(2022) promotes quality assurance and enhances the selection process for silica refractory bricks in any industrial process involving high temperatures. By complying with this standard, manufacturers and users can:
- Predict brick performance based on impurity content
- Improve furnace reliability and reduce maintenance costs
- Meet regulatory and safety requirements for refractory materials
- Facilitate international trade by adhering to globally accepted classification principles
Keywords: silica refractory brick, ASTM C416, classification, chemical composition, modulus of rupture, refractories, industrial furnaces, high-temperature insulation, brick standards.
Frequently Asked Questions
ASTM C416-97(2022) is a standard published by ASTM International. Its full title is "Standard Classification of Silica Refractory Brick". This standard covers: SIGNIFICANCE AND USE 3.1 The presence of certain impurities in silica brick tends to lower their refractoriness and service limits. This classification permits those familiar with refractories to predict the refractoriness of silica brick from their alkali and alumina contents. SCOPE 1.1 This classification is limited to silica brick meeting the following requirements: 1.1.1 Alumina (Al2O3) content of less than 1.50 %. 1.1.2 Titania (TiO2) content of less than 0.20 %. 1.1.3 Iron oxide (FeO3) content of less than 2.50 %. 1.1.4 Calcium oxide (CaO) content of less than 4.00 %. 1.1.5 Average modulus of rupture of not less than 500 psi (3.45 MPa). 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
SIGNIFICANCE AND USE 3.1 The presence of certain impurities in silica brick tends to lower their refractoriness and service limits. This classification permits those familiar with refractories to predict the refractoriness of silica brick from their alkali and alumina contents. SCOPE 1.1 This classification is limited to silica brick meeting the following requirements: 1.1.1 Alumina (Al2O3) content of less than 1.50 %. 1.1.2 Titania (TiO2) content of less than 0.20 %. 1.1.3 Iron oxide (FeO3) content of less than 2.50 %. 1.1.4 Calcium oxide (CaO) content of less than 4.00 %. 1.1.5 Average modulus of rupture of not less than 500 psi (3.45 MPa). 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM C416-97(2022) is classified under the following ICS (International Classification for Standards) categories: 81.080 - Refractories. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C416-97(2022) has the following relationships with other standards: It is inter standard links to ASTM C133-24, ASTM C133-97(2008), ASTM C133-97(2008)e1, ASTM C133-97(2003), ASTM C133-97. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C416-97(2022) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C416 −97 (Reapproved 2022)
Standard Classification of
Silica Refractory Brick
This standard is issued under the fixed designation C416; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
Institute of Standards and Technology and other appropriate sources.
1. Scope
1.1 This classification is limited to silica brick meeting the 3. Significance and Use
following requirements:
3.1 Thepresenceofcertainimpuritiesinsilicabricktendsto
1.1.1 Alumina (Al O ) content of less than 1.50 %.
2 3
lower their refractoriness and service limits. This classification
1.1.2 Titania (TiO ) content of less than 0.20 %.
permits those familiar with refractories to predict the refracto-
1.1.3 Iron oxide (FeO ) content of less than 2.50 %.
riness of silica brick from their alkali and alumina contents.
1.1.4 Calcium oxide (CaO) content of less than 4.00 %.
4. Basis of Classification
1.1.5 Average modulus of rupture of not less than 500 psi
(3.45 MPa).
4.1 Flux Factor—Silica brick are classified on the basis of
impurities by the use of a “flux factor,” which is equal to the
1.2 This standard does not purport to address all of the
percent of alumina plus twice the percent of total alkalies.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.2 Types:
priate safety, health, and environmental practices and deter-
4.2.1 Type A—Silica brick having a flux factor of 0.50 or
mine the applicability of regulatory limitations prior to use.
less.
1.3 This international standard was developed in accor-
4.2.2 Type B—All other silica brick falling within the scope
dance with internationally recognized principles on standard-
of this classification.
ization established in the Decision on Principles for the
5. Test Methods
Development of International Standards, Guides and Recom-
5.1 The properties listed in this classification shall be
mendations issued by the World Trade Organization Technical
determined in accordance with the following ASTM methods:
Barriers to Trade (TBT) Committee.
5.1.1 Modulus of Rupture—Test Methods C133.
2. Referenced Documents
5.1.2 Chemical Analysis—XRF and ICP.
2.1 ASTM Standards:
6. Retests
C133 Test Methods for Cold Crushing Strength and Modu-
6.1 Because of variables resulting from sampling and the
lus of Rupture of Refractories
lack of satisfactory reproducibility in tests conducted by
NOTE 1—Chemical analysis of refractory products is determined by a
different laboratories, the material may be resampled and
combination of X-ray fluorescence (XRF)
...
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