ASTM D7185-19
(Specification)Standard Specification for Low Toluene Low Dioxane (LTLD) Benzene
Standard Specification for Low Toluene Low Dioxane (LTLD) Benzene
ABSTRACT
This specification covers the requirements for a grade of benzene known as low toluene low dioxane (LTLD) benzene. Sampled materials shall meet specified values of the following physical and chemical properties: purity; toluene content; sulfur content; thiophene content; nonaromatic hydrocarbons content; nitrogen content; acid wash color; color in Pt-Co scale; 1,4 dioxane content; anhydrous basis solidification point; water content; and total chlorides.
SCOPE
1.1 This specification covers a grade of benzene known as Low Toluene Low Dioxane (LTLD) Benzene.
1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 Consult current OSHA regulations, supplier’s Safety Data Sheets, and local regulations for all materials used in this specification.
1.5 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-Oct-2019
- Technical Committee
- D16 - Aromatic, Industrial, Specialty and Related Chemicals
- Drafting Committee
- D16.01 - Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives
Relations
- Effective Date
- 01-Nov-2019
- Effective Date
- 01-Jan-2024
- Effective Date
- 01-Jan-2024
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Nov-2023
- Effective Date
- 15-Aug-2020
- Effective Date
- 01-Jun-2020
- Effective Date
- 01-Jun-2019
- Effective Date
- 01-Jun-2019
- Effective Date
- 01-Nov-2018
- Effective Date
- 01-Jun-2017
- Effective Date
- 01-Apr-2017
- Effective Date
- 01-Jul-2015
- Effective Date
- 01-Jul-2015
- Effective Date
- 01-Jun-2015
Overview
ASTM D7185-19, the Standard Specification for Low Toluene Low Dioxane (LTLD) Benzene, outlines essential requirements for a specialty grade of benzene with specifically limited toluene and dioxane content. Developed by ASTM International, this standard helps ensure consistent quality and safety for benzene used in industrial and laboratory environments. The specification covers key physical and chemical properties, sampling, and testing procedures, providing critical guidance for manufacturers, suppliers, and purchasers of LTLD benzene.
Key Topics
- Purity Requirements: LTLD benzene must meet a minimum purity level, clearly defined by mass and weight percentage.
- Contaminant Limits: Strict maximum allowable levels are set for:
- Toluene content
- Thiophene content
- 1,4 Dioxane content
- Nonaromatic hydrocarbons
- Total chlorides
- Sulfur and nitrogen (when agreed upon)
- Physical Properties: Includes criteria for:
- Acid wash color
- Platinum-Cobalt scale color
- Anhydrous solidification point
- Water content
- Visual appearance (free of haze, particulates, or suspended matter)
- Test Methods: The standard specifies recognized ASTM methods for evaluating each property. Producers and users should agree on a referee test method when multiple methods are listed.
Applications
Low Toluene Low Dioxane Benzene is essential for applications requiring high chemical purity with minimal contamination from common benzene impurities such as toluene and dioxane. Typical use cases include:
- Chemical Manufacturing: As a feedstock or reagent where strict chemical composition is critical to process outcomes.
- Analytical Laboratories: When high-purity solvents are necessary to prevent interference in sensitive analyses or syntheses.
- Pharmaceutical Industry: For applications where contaminants could impact product quality or regulatory compliance.
- Quality and Compliance: The specification aids both producers and consumers in meeting regulatory, health, and safety requirements for handling, storage, and use of benzene.
To ensure safety and compliance, users must reference relevant OSHA regulations, supplier safety data sheets (SDS), and local legislative requirements.
Related Standards
ASTM D7185-19 is supported by a range of referenced test methods and specifications that ensure accurate sampling and analysis, including:
- ASTM D848: Acid Wash Color of Industrial Aromatic Hydrocarbons
- ASTM D7360 or D7504: Analysis of Benzene by Gas Chromatography
- ASTM D852 / D6875: Solidification Point
- ASTM D6304 / E1064: Water Content by Coulometric Karl Fischer Titration
- ASTM D5386 / D8005: Color of Liquids (Platinum-Cobalt Scale)
- ASTM D5194 / D5808: Chloride Analysis in Aromatic Hydrocarbons
- ASTM D4735 / D7011: Trace Thiophene Detection
In addition, Practice E29 outlines the rounding procedure for conformance with specification limits. The standard is in alignment with international trade principles as outlined by the WTO Technical Barriers to Trade Committee.
Practical Value
By adhering to ASTM D7185-19, organizations can confidently assure the quality, purity, and compliance of LTLD benzene in diverse industrial and scientific settings. This reduces the risk of process contamination, enhances reproducibility in research, and supports conformance with both customer specifications and global regulatory frameworks.
Keywords: ASTM D7185, LTLD benzene, low toluene benzene, low dioxane benzene, benzene specification, chemical purity standards, industrial benzene, ASTM standards.
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Frequently Asked Questions
ASTM D7185-19 is a technical specification published by ASTM International. Its full title is "Standard Specification for Low Toluene Low Dioxane (LTLD) Benzene". This standard covers: ABSTRACT This specification covers the requirements for a grade of benzene known as low toluene low dioxane (LTLD) benzene. Sampled materials shall meet specified values of the following physical and chemical properties: purity; toluene content; sulfur content; thiophene content; nonaromatic hydrocarbons content; nitrogen content; acid wash color; color in Pt-Co scale; 1,4 dioxane content; anhydrous basis solidification point; water content; and total chlorides. SCOPE 1.1 This specification covers a grade of benzene known as Low Toluene Low Dioxane (LTLD) Benzene. 1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 Consult current OSHA regulations, supplier’s Safety Data Sheets, and local regulations for all materials used in this specification. 1.5 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.
ABSTRACT This specification covers the requirements for a grade of benzene known as low toluene low dioxane (LTLD) benzene. Sampled materials shall meet specified values of the following physical and chemical properties: purity; toluene content; sulfur content; thiophene content; nonaromatic hydrocarbons content; nitrogen content; acid wash color; color in Pt-Co scale; 1,4 dioxane content; anhydrous basis solidification point; water content; and total chlorides. SCOPE 1.1 This specification covers a grade of benzene known as Low Toluene Low Dioxane (LTLD) Benzene. 1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 Consult current OSHA regulations, supplier’s Safety Data Sheets, and local regulations for all materials used in this specification. 1.5 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 D7185-19 is classified under the following ICS (International Classification for Standards) categories: 75.160.20 - Liquid fuels. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D7185-19 has the following relationships with other standards: It is inter standard links to ASTM D7185-17, ASTM E1064-24, ASTM D5194-24, ASTM E2680-23, ASTM D5808-23, ASTM D7536-20, ASTM D7184-20, ASTM D7184-15(2019)e1, ASTM D7011-15(2019), ASTM D7183-18a, ASTM D7504-17a, ASTM D7504-17, ASTM D7504-15e1, ASTM D7504-15, ASTM D8005-15. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D7185-19 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: D7185 −19
Standard Specification for
Low Toluene Low Dioxane (LTLD) Benzene
This standard is issued under the fixed designation D7185; 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.
1. Scope D5194 Test Method for Trace Chloride in Liquid Aromatic
Hydrocarbons
1.1 This specification covers a grade of benzene known as
D5386 Test Method for Color of Liquids Using Tristimulus
Low Toluene Low Dioxane (LTLD) Benzene.
Colorimetry
1.2 The following applies to all specified limits in this
D5808 Test Method for Determining Chloride in Aromatic
standard: for purposes of determining conformance with this
Hydrocarbons and Related Chemicals by Microcoulom-
standard, an observed value or a calculated value shall be
etry
rounded off “to the nearest unit” in the last right-hand digit
D6875 Test Method for Solidification Point of Industrial
used in expressing the specification limit, in accordance with
Organic Chemicals by Thermistor
the rounding-off method of Practice E29.
D7011 Test Method for Determination of Trace Thiophene
1.3 The values stated in SI units are to be regarded as the
in Refined Benzene by Gas Chromatography and Sulfur
standard. The values given in parentheses are for information
Selective Detection
only.
D7183 Test Method for Determination of Total Sulfur in
Aromatic Hydrocarbons and Related Chemicals by Ultra-
1.4 Consult current OSHA regulations, supplier’s Safety
Data Sheets, and local regulations for all materials used in this violet Fluorescence
specification. D7184 Test Method for Ultra Low Nitrogen in Aromatic
Hydrocarbons by Oxidative Combustion and Reduced
1.5 This international standard was developed in accor-
Pressure Chemiluminescence Detection
dance with internationally recognized principles on standard-
D7359 Test Method for Total Fluorine, Chlorine and Sulfur
ization established in the Decision on Principles for the
in Aromatic Hydrocarbons and Their Mixtures by Oxida-
Development of International Standards, Guides and Recom-
tive Pyrohydrolytic Combustion followed by Ion Chroma-
mendations issued by the World Trade Organization Technical
tography Detection (Combustion Ion Chromatography-
Barriers to Trade (TBT) Committee.
CIC)
2. Referenced Documents
D7360 Test Method for Analysis of Benzene by Gas Chro-
matography with External Calibration
2.1 ASTM Standards:
D7457 Test Method for Determining Chloride in Aromatic
D848 Test Method for Acid Wash Color of Industrial Aro-
Hydrocarbons and Related Chemicals by Microcoulom-
matic Hydrocarbons
etry
D852 Test Method for Solidification Point of Benzene
D3437 Practice for Sampling and Handling Liquid Cyclic D7504 Test Method for Trace Impurities in Monocyclic
Aromatic Hydrocarbons by Gas Chromatography and
Products
D4735 Test Method for Determination of Trace Thiophene Effective Carbon Number
in Refined Benzene by Gas Chromatography D7536 Test Method for Chlorine in Aromatics by Mono-
chromatic Wavelength Dispersive X-ray Fluorescence
Spectrometry
This specification is under the jurisdiction of ASTM Committee D16 on
D8005 Test Method for Color of Clear Liquids (Platinum-
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
bility of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and
Cobalt Scale)
Their Derivatives.
E29 Practice for Using Significant Digits in Test Data to
Current edition app
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7185 − 17 D7185 − 19
Standard Specification for
Low Toluene Low Dioxane (LTLD) Benzene
This standard is issued under the fixed designation D7185; 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.
1. Scope
1.1 This specification covers a grade of benzene known as Low Toluene Low Dioxane (LTLD) Benzene.
1.2 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard,
an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing
the specification limit, in accordance with the rounding-off method of Practice E29.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 Consult current OSHA regulations, supplier’s Safety Data Sheets, and local regulations for all materials used in this
specification.
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D848 Test Method for Acid Wash Color of Industrial Aromatic Hydrocarbons
D852 Test Method for Solidification Point of Benzene
D1685 Test Method for Traces of Thiophene in Benzene by Spectrophotometry (Withdrawn 2009)
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D4492 Test Method for Analysis of Benzene by Gas Chromatography (Withdrawn 2018)
D4735 Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography
D5194 Test Method for Trace Chloride in Liquid Aromatic Hydrocarbons
D5386 Test Method for Color of Liquids Using Tristimulus Colorimetry
D5808 Test Method for Determining Chloride in Aromatic Hydrocarbons and Related Chemicals by Microcoulometry
D6304 Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl
Fischer Titration
D6875 Test Method for Solidification Point of Industrial Organic Chemicals by Thermistor
D7011 Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography and Sulfur Selective
Detection
D7183 Test Method for Determination of Total Sulfur in Aromatic Hydrocarbons and Related Chemicals by Ultraviolet
Fluorescence
D7184 Test Method for Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative Combustion and Reduced Pressure
Chemiluminescence Detection
D7359 Test Method for Total Fluorine, Chlorine and Sulfur in Aromatic Hydrocarbons and Their Mixtures by Oxidative
Pyrohydrolytic Combustion followed by Ion Chromatography Detection (Combustion Ion Chromatography-CIC)
D7360 Test Method for Analysis of Benzene by Gas Chromatography with External Calibration
D7375 Test Method for Trace Quantities of Water in Aromatic Hydrocarbons and Their Mixtures by Coulometric Karl Fischer
Titration (Withdrawn 2017)
This specification is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives.
Current edition approved June 1, 2017Nov. 1, 2019. Published June 2017November 2019. Originally approved in 2006. Last previous edition approved in 20162017 as
D7185 – 16.D7185 – 17. DOI: 10.1520/D7185-17.10.1520/D7185-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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