ASTM D3235-23

Standard Test Method for Solvent Extractables in Petroleum Waxes

SIGNIFICANCE AND USE
5.1 The solvent extractables in a wax may have significant effects on several of its properties such as strength, hardness, flexibility, scuff resistance, coefficient of friction, coefficient of expansion, melting point, and staining characteristics. Whether these effects are desirable or undesirable depends on the intended use of the wax.
SCOPE
1.1 This test method covers the determination of solvent extractables in petroleum waxes.  
1.2 The values stated in SI units are to be regarded as standard.  
1.2.1 Exception—The values given in parentheses are for information only.  
1.3 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.  
1.4 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: 30-Sep-2023
• ICS: 75.080 - Petroleum products in general
• ICS: 75.100 - Lubricants, industrial oils and related products
• ICS: 75.140 - Waxes, bituminous materials and other petroleum products
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.10 - Properties of Petroleum Waxes and Alternative Wax-like Materials

Relations

• Replaces: ASTM D3235-16e1 - Standard Test Method for Solvent Extractables in Petroleum Waxes
• Effective Date: 01-Oct-2023
• Refers: ASTM D4175-23a - Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• Effective Date: 15-Dec-2023
• Refers: ASTM D4175-23e1 - Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• Effective Date: 01-Jul-2023
• Refers: ASTM D4175-23 - Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• Effective Date: 01-Jul-2023

Overview

ASTM D3235-23, Standard Test Method for Solvent Extractables in Petroleum Waxes, is a key international standard published by ASTM International. This document provides a precise method for determining the amount of solvent extractables present in petroleum waxes. Solvent extractables, which are materials soluble in certain organic solvents but not part of the wax itself, can impact critical properties such as strength, hardness, flexibility, scuff resistance, coefficient of friction, expansion, melting point, and staining characteristics. The standard is crucial for quality control, research, and application development across industries utilizing petroleum waxes.

Key Topics

• Scope and Applicability

  • Covers the quantitative analysis of solvent extractables in all types of petroleum waxes using a specified solvent extraction method.
  • Designates SI units as the standard measurements.
  • Addresses the importance of safety, health, and environmental practices during test execution.

• Significance and Use

  • Highlights the ways solvent extractables influence product performance in end-use applications.
  • Stresses that the desirability of specific extractables levels depends on the wax’s intended function.

• Test Method Summary

  • Involves dissolving a wax sample in a 50% methyl ethyl ketone and 50% toluene mix, cooling to precipitate the wax, filtering, evaporating the solvent, and weighing the residue to determine extractables.
  • Ensures consistent and repeatable results for quality assurance.

• Precision and Reporting

  • Outlines the repeatability and reproducibility expectations for interlaboratory consistency.
  • Requires reporting results to the nearest 0.1% by mass.

Applications

ASTM D3235-23 is widely applied in the following fields:

• Quality Control of Petroleum Waxes

  • Ensures waxes meet the necessary specifications for various commercial and industrial uses by accurately monitoring solvent extractables content.

• Product Development

  • Supports formulation of waxes with tailored properties for different applications, such as packaging, polishes, coatings, and candles.

• Regulatory Compliance

  • Assists manufacturers and laboratories in adhering to international and organizational standards when exporting or certifying wax materials.

• Performance Optimization

  • Provides data critical for optimizing wax performance by correlating extractables levels with physical and chemical properties.

• Research and Laboratory Testing

  • Standardizes comparative studies on wax composition, aiding scientific progress and material innovation.

Related Standards

Several ASTM standards are closely related to ASTM D3235-23 and often used in parallel for comprehensive testing of petroleum products:

• ASTM D4175 – Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
• ASTM E1 – Specification for ASTM Liquid-in-Glass Thermometers, essential for precise temperature measurements in laboratory testing
• ASTM E128 – Test Method for Maximum Pore Diameter and Permeability of Rigid Porous Filters, used for evaluating filtration apparatus

These related documents provide supporting definitions, apparatus specifications, and additional methodologies to ensure reliable testing and consistency across laboratories.

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Keywords: ASTM D3235, solvent extractables, petroleum waxes, wax testing, standard test method, quality control, wax properties, laboratory analysis, ASTM standards

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: D3235 − 23
Standard Test Method for
Solvent Extractables in Petroleum Waxes
This standard is issued under the fixed designation D3235; 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* 4. Summary of Test Method
1.1 This test method covers the determination of solvent 4.1 The sample is dissolved in a mixture consisting of 50 %
by volume methyl ethyl ketone and 50 % by volume toluene.
extractables in petroleum waxes.
The solution is cooled to −32 °C (−25 °F) to precipitate the
1.2 The values stated in SI units are to be regarded as
wax, then filtered. The solvent extractables content is deter-
standard.
mined by evaporating the solvent from the filtrate and deter-
1.2.1 Exception—The values given in parentheses are for
mining the mass of the residue.
information only.
1.3 This standard does not purport to address all of the 5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 The solvent extractables in a wax may have significant
responsibility of the user of this standard to establish appro-
effects on several of its properties such as strength, hardness,
priate safety, health, and environmental practices and deter-
flexibility, scuff resistance, coefficient of friction, coefficient of
mine the applicability of regulatory limitations prior to use.
expansion, melting point, and staining characteristics. Whether
1.4 This international standard was developed in accor-
these effects are desirable or undesirable depends on the
dance with internationally recognized principles on standard-
intended use of the wax.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
6. Apparatus
mendations issued by the World Trade Organization Technical
6.1 Filter Stick and Assembly, consisting of a 10 mm diam-
Barriers to Trade (TBT) Committee.
eter sintered glass filter stick of 10 μm to 15 μm maximum pore
diameter as determined by the method in Appendix X1,
2. Referenced Documents
provided with an air pressure inlet tube and delivery nozzle. It
2.1 ASTM Standards:
is provided with a ground-glass joint to fit a 25 mm by 170 mm
D4175 Terminology Relating to Petroleum Products, Liquid
test tube. The dimensions for a suitable filtration assembly are
Fuels, and Lubricants
shown in Fig. 1.
E1 Specification for ASTM Liquid-in-Glass Thermometers
NOTE 1—A metallic filter stick may be employed if desired. A filter
E128 Test Method for Maximum Pore Diameter and Perme-
stick made of stainless steel and having a 12.7 mm (0.50 in.) disk of
ability of Rigid Porous Filters for Laboratory Use
10 nm to 15 nm maximum pore diameter, as determined by Test Method
E128, has been found to be satisfactory. The metallic apparatus is inserted
into a 25 mm by 150 mm test tube and held in place by means of a cork.
3. Terminology
6.2 Cooling Bath, consisting of an insulated box with
3.1 Definitions:
30 mm 6 5 mm (1.2 in. 6 0.2 in.) holes in the center to
3.1.1 For definitions of terms used in this test method, refer
accommodate any desired number of test tubes. The bath may
to Terminology D4175.
be filled with a suitable medium such as kerosine, and may be
cooled by circulating a refrigerant through coils, or by using
solid carbon dioxide. A suitable cooling bath to accommodate
This test method is under the jurisdiction of ASTM Committee D02 on
three test tubes is shown in Fig. 2.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.10 on Properties of Petroleum Waxes and Alternative Wax-like
Materials.
Current edition approved Oct. 1, 2023. Published October 2023. Originally The sole source of supply of a suitable metal filter stick with designated
ɛ1
approved in 1973. Last previous edition approved in 2016 as D3235 – 16 . DOI: porosity G known to the committee at this time is the Pall Trinity Micro Corp.,
10.1520/D3235-23. Route 281, Cortland, NY 13045. A list of United Kingdom suppliers can be obtained
For referenced ASTM standards, visit the ASTM website, www.astm.org, or from Energy Institute, 61 New Cavendish St., London, W1G 7AR, United King-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM dom. If you are aware of alternative suppliers, please provide this information to
Standards volume information, refer to the standard’s Document Summary page on ASTM International Headquarters. Your comments will receive careful consider-
the ASTM website. ation at a meeting of the responsible technical committee, which you may attend.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3235 − 23
All dimensions are in millimetres.
FIG. 1 Filter Stick
6.3 Dropper Pipet, dispensing device capable of delivering they exhibit the same temperature response as the equivalent
0.5 g 6 0.05 g of molten wax. mercury-in-glass thermometers.
6.4 Transfer Pipet, or equivalent volume dispensing device,
6.7 Weighing Bottles, glass-stoppered, having a typical ca-
capable of delivering 15 mL 6 0.06 mL.
pacity of 15 mL to 25 mL.
6.5 Air Pressure Regulator, designed to supply air to the
6.8 Evaporation Assembly, consisting of an evaporating
filtration assembly (9.5) at sufficient pressure to give an even
cabinet and connections, essentially as illustrated in Fig. 4, and
flow of filtrate. Either a conventional pressure-reducing valve
capable of maintaining a temperature of 35 °C 6 1 °C (95 °F
or a mercury bubbler-type regulator has been found satisfac-
6 2 °F) around the evaporation flasks. Construct the jets with
tory. The latter type, illustrated in Fig. 3, consists of a 250 mL
an inside diameter of 4 mm 6 0.2 mm for delivering a stream
glass cylinder and a T-tube held in the cylinder by means of a
of clean, dry air vertically downward into the weighing bottle.
rubber stopper grooved at the sides to permit the escape of
Support each jet so that the tip is 15 mm 6 5 mm above the
excess air. The volume and pressure of the air supplied to the
surface of the liquid at the start of the evaporation. Supply
filtration assembly is regulated by the depth to which the T-tube
purified air at the rate of 2 L ⁄min to 3 L ⁄min per jet. One way
is immersed in mercury at the bottom of the cylinder. Absor-
to purify the air is to pass it through a tube of approximately
bent cotton placed in the space above the mercury prevents the
1 cm bore packed loosely to a height of approximately 20 cm
loss of mercury by spattering. The air pressure regulator is
with absorbent cotton. Periodically check the cleanliness of the
connected to the filter stick and assembly by means of rubber
air by evaporating 4 mL of the solvent mixture described in 7.3
tubing.
by the procedure specified in 9.5. When the residue does not
6.6 Temperature Measuring Devices:
exceed 0.1 mg, the evaporation equipment is operating satis-
6.6.1 Thermometers, two, having a range as shown below
factorily.
and conforming to the requirements as prescribed in Specifi-
NOTE 2—Investigations by the European World Federation have indi-
cation E1 or in the specifications for IP Standard Thermom-
cated that improved precision may be achieved by individually calibrating
eters. One thermometer is required for the cold bath and a
each nozzle to deliver a flow rate of 2 L ⁄min to 3 L ⁄min.
second thermometer is required for the sample solution.
6.9 Analytical Balance, capable of reproducing masses to
Thermometer Number
Temperature Range ASTM IP
0.1 mg.
−37 °C to +21 °C 71C 72C
−35 °F to +70 °F 71F 72F
6.10 Wire Stirrer—A piece of stiff made of iron, stainless
6.6.2 Temperature measuring devices other than those de- steel, or Nichrome wire of about No. 20 Bands (0.9 mm in
scribed in 6.6.1 are satisfactory for this test method, provided diameter) or 16 swg. gage, 250 mm long. A 10 mm diameter
D3235 − 23
All dimensions are in millimetres (inches).
FIG. 2 Cooling Bath
loop is formed at each end, and the loop at the bottom end is 7.4 Store the solvent mixture over a suitable drying agent,
bent so that the plane of the loop is perpendicular to the wire. such as anhydrous calcium sulfate (five mass percent of the
solvent). Filter prior to use.
7. Solvent
7.1 Methyl Ethyl Ketone, conforming to the specifications of 8. Sample
the Committee on Analytical Reagents of the American Chemi-
8.1 Obtain a representative portion by melting the entire
cal Society.
sample and stirring thoroughly. This is necessary because the
7.2 Toluene, conforming to the specifications of the Com-
extractables may not be distributed uniformly throughout the
mittee on Analytical Reagents of the American Chemical
solidified sample.
Society.
9. Procedure
7.3 Solvent Mixture—Prepare a mixture of 50 % by vol-
ume methyl ethyl ketone and 50 % by volume toluene.
9.1 Melt a representative portion of the sample, using a
water bath or oven maintained at 70 °C to 100 °C (158 °F to
212 °F). As soon as the wax is completely melted, thoroughly
ACS Reagent Chemicals, Specifications and Procedures for Reagents and
Standard-Grade Reference Materials, American Chemical Society, Washington,
mix. Preheat the pipet or equivalent measuring device in order
DC. For suggestions on the testing of reagents not listed by the American Chemical
to prevent the solidification of wax in the tip, and withdraw a
Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
portion of the sample as soon as possible after the wax has
U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
copeial Convention, Inc. (USPC), Rockville, MD. melted. The mass of wax transferred to the test tube must be
D3235 − 23
immediately immerse in the mixture the clean, dry filter stick,
which has previously been cooled by placing it in a test tube
and holding at −34.5 °C 6 1.0 °C (−30.0 °F 6 2.0 °F) in the
cooling bath for a minimum of 10 min. Seat the ground-glass
joint of the filter so as to make an airtight seal. Place an
unstoppered weig
...

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.
´1
Designation: D3235 − 16 D3235 − 23
Standard Test Method for
Solvent Extractables in Petroleum Waxes
This standard is issued under the fixed designation D3235; 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.
ε NOTE—Corrected misplaced figures editorially in December 2016.
1. Scope*
1.1 This test method covers the determination of solvent extractables in petroleum waxes.
1.2 The values stated in SI units are to be regarded as standard.
1.2.1 Exception—The values given in parentheses are for information only.
1.3 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.
1.4 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:
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
E1 Specification for ASTM Liquid-in-Glass Thermometers
E128 Test Method for Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
4. Summary of Test Method
4.1 The sample is dissolved in a mixture consisting of 50 % by volume methyl ethyl ketone and 50 % by volume toluene. The
solution is cooled to −32 °C (−25 °F) to precipitate the wax, then filtered. The solvent extractables content is determined by
evaporating the solvent from the filtrate and determining the mass of the residue.
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.10 on Properties of Petroleum Waxes and Alternative Wax-like Materials.
Current edition approved July 1, 2016Oct. 1, 2023. Published July 2016October 2023. Originally approved in 1973. Last previous edition approved in 20152016 as
ɛ1
D3235 – 15.D3235 – 16 . DOI: 10.1520/D3235-16E01.10.1520/D3235-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3235 − 23
5. Significance and Use
5.1 The solvent extractables in a wax may have significant effects on several of its properties such as strength, hardness, flexibility,
scuff resistance, coefficient of friction, coefficient of expansion, melting point, and staining characteristics. Whether these effects
are desirable or undesirable depends on the intended use of the wax.
6. Apparatus
6.1 Filter Stick and Assembly, consisting of a 10 mm diameter sintered glass filter stick of 10 μm to 15 μm maximum pore diameter
as determined by the method in Appendix X1, provided with an air pressure inlet tube and delivery nozzle. It is provided with a
ground-glass joint to fit a 25 mm by 170 mm test tube. The dimensions for a suitable filtration assembly are shown in Fig. 1.
NOTE 1—A metallic filter stick may be employed if desired. A filter stick made of stainless steel and having a 12.7 mm (0.50 in.) disk of 10 nm to 15 nm
maximum pore diameter, as determined by Test Method E128, has been found to be satisfactory. The metallic apparatus is inserted into a 25 mm by
150 mm test tube and held in place by means of a cork.
6.2 Cooling Bath, consisting of an insulated box with 30 mm 6 5 mm (1.2 in. 6 0.2 in.) holes in the center to accommodate any
desired number of test tubes. The bath may be filled with a suitable medium such as kerosine, and may be cooled by circulating
a refrigerant through coils, or by using solid carbon dioxide. A suitable cooling bath to accommodate three test tubes is shown in
Fig. 2.
6.3 Dropper Pipet, dispensing device capable of delivering 0.5 g 6 0.05 g of molten wax.
6.4 Transfer Pipet, or equivalent volume dispensing device, capable of delivering 15 mL 6 0.06 mL.
All dimensions are in millimetres.
FIG. 1 Filter Stick
The sole source of supply of a suitable metal filter stick with designated porosity G known to the committee at this time is the Pall Trinity Micro Corp., Route 281,
Cortland, NY 13045. A list of United Kingdom suppliers can be obtained from Energy Institute, 61 New Cavendish St., London, W1G 7AR, United Kingdom. If you are aware
of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible
technical committee, which you may attend.
D3235 − 23
All dimensions are in millimetres (inches).
FIG. 2 Cooling Bath
6.5 Air Pressure Regulator, designed to supply air to the filtration assembly (8.59.5) at sufficient pressure to give an even flow of
filtrate. Either a conventional pressure-reducing valve or a mercury bubbler-type regulator has been found satisfactory. The latter
type, illustrated in Fig. 3, consists of a 250 mL glass cylinder and a T-tube held in the cylinder by means of a rubber stopper
grooved at the sides to permit the escape of excess air. The volume and pressure of the air supplied to the filtration assembly is
regulated by the depth to which the T-tube is immersed in mercury at the bottom of the cylinder. Absorbent cotton placed in the
space above the mercury prevents the loss of mercury by spattering. The air pressure regulator is connected to the filter stick and
assembly by means of rubber tubing.
6.6 Temperature Measuring Devices:
6.6.1 Thermometers, two, having a range as shown below and conforming to the requirements as prescribed in Specification E1
or in the specifications for IP Standard Thermometers. One thermometer is required for the cold bath and a second thermometer
is required for the sample solution.
Thermometer Number
Temperature Range ASTM IP
−37 °C to +21 °C 71C 72C
−35 °F to +70 °F 71F 72F
D3235 − 23
All dimensions are in millimetres.
FIG. 3 Air Pressure Regulator
6.6.2 Temperature measuring devices other than those described in 5.6.16.6.1 are satisfactory for this test method, provided they
exhibit the same temperature response as the equivalent mercury-in-glass thermometers.
6.7 Weighing Bottles, glass-stoppered, having a typical capacity of 15 mL to 25 mL.
6.8 Evaporation Assembly, consisting of an evaporating cabinet and connections, essentially as illustrated in Fig. 4, and capable
of maintaining a temperature of 35 °C 6 1 °C (95 °F 6 2 °F) around the evaporation flasks. Construct the jets with an inside
diameter of 4 mm 6 0.2 mm for delivering a stream of clean, dry air vertically downward into the weighing bottle. Support each
jet so that the tip is 15 mm 6 5 mm above the surface of the liquid at the start of the evaporation. Supply purified air at the rate
of 2 L ⁄min to 3 L ⁄min per jet. One way to purify the air is to pass it through a tube of approximately 1 cm bore packed loosely
to a height of approximately 20 cm with absorbent cotton. Periodically check the cleanliness of the air by evaporating 4 mL of the
solvent mixture described in 6.37.3 by the procedure specified in 8.59.5. When the residue does not exceed 0.1 mg, the evaporation
equipment is operating satisfactorily.
NOTE 2—Investigations by the European World Federation have indicated that improved precision may be achieved by individually calibrating each
nozzle to deliver a flow rate of 2 L ⁄min to 3 L ⁄min.
6.9 Analytical Balance, capable of reproducing masses to 0.1 mg.
6.10 Wire Stirrer—A piece of stiff made of iron, stainless steel, or Nichrome wire of about No. 20 Bands (0.9 mm in diameter)
or 16 swg. gage, 250 mm long. A 10 mm diameter loop is formed at each end, and the loop at the bottom end is bent so that the
plane of the loop is perpendicular to the wire.
7. Solvent
7.1 Methyl Ethyl Ketone, conforming to the specifications of the Committee on Analytical Reagents of the American Chemical
Society.
7.2 Toluene, conforming to the specifications of the Committee on Analytical Reagents of the American Chemical Society.
Reagent Chemicals, American Chemical Society Specifications,ACS Reagent Chemicals, Specifications and Procedures for Reagents and Standard-Grade Reference
Materials, American Chemical Society, Washington, DC. For Suggestionssuggestions on the testing of reagents not listed by the American Chemical Society, see
AnnualAnalar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharmacopeial
Convention, Inc. (USPC), Rockville, MD.
D3235 − 23
All dimensions are in millimetres (inches).
FIG. 4 Evaporation Assembly
7.3 Solvent Mixture—Prepare a mixture of 50 % by volume methyl ethyl ketone and 50 % by volume toluene.
7.4 Store the solvent mixture over a suitable drying agent, such as anhydrous calcium sulfate (five mass percent of the solvent).
Filter prior to use.
8. Sample
8.1 Obtain a representative portion by melting the entire sample and stirring thoroughly. This is necessary because the extractables
may not be distributed uniformly throughout the solidified sample.
9. Procedure
9.1 Melt a representative portion of the sample, using a water bath or oven maintained at 70 °C to 100 °C (158 °F to 212 °F). As
soon as the wax is completely melted, thoroughly mix. Preheat the pipet or equivalent measuring device in order to prevent the
D3235 − 23
solidification of wax in the tip, and withdraw a portion of the sample as soon as possible after the wax has melted. The mass of
wax transferred to the test tube must be 1.00 g 6 0.05 g. Allow the test tube to cool, and determine the mass to at least the nearest
1 mg.
NOTE 3—The mass of a test tube which is cleaned by means of solvent will not vary to a significant extent. Therefore, a tare mass may be obtained and
used repeatedly.
9.2
...