ASTM C892-19

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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
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Designation: C892 − 18a C892 − 19
Standard Specification for
High-Temperature Fiber Blanket Thermal Insulation
This standard is issued under the fixed designation C892; 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 high-temperature fiber blanket thermal insulation for use from ambient up to 3000°F (1649°C).
1.2 When the potential exists that the installation or use of thermal insulation materials, accessories, and systems will pose
safety or health problems, the manufacturers shall provide the user with appropriate current information regarding any known
problems associated with the recommended use of the products, and shall also recommend protective measures to be employed
in their safe utilization. The user shall establish appropriate safety and health practices and determine the applicability of regulatory
requirements prior to use.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical
conversions to SI units which are provided for information only and are not considered standard.
1.4 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.
1.5 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:
C71 Terminology Relating to Refractories
C167 Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations
C168 Terminology Relating to Thermal Insulation
C177 Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the
Guarded-Hot-Plate Apparatus
C201 Test Method for Thermal Conductivity of Refractories
C209 Test Methods for Cellulosic Fiber Insulating Board
C356 Test Method for Linear Shrinkage of Preformed High-Temperature Thermal Insulation Subjected to Soaking Heat
C390 Practice for Sampling and Acceptance of Thermal Insulation Lots
C665 Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing
C680 Practice for Estimate of the Heat Gain or Loss and the Surface Temperatures of Insulated Flat, Cylindrical, and Spherical
Systems by Use of Computer Programs
C795 Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
C1045 Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions
C1058 Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation
C1101/C1101M Test Methods for Classifying the Flexibility or Rigidity of Mineral Fiber Blanket and Board Insulation
C1104/C1104M Test Method for Determining the Water Vapor Sorption of Unfaced Mineral Fiber Insulation
C1335 Test Method for Measuring Non-Fibrous Content of Man-Made Rock and Slag Mineral Fiber Insulation
C1617 Practice for Quantitative Accelerated Laboratory Evaluation of Extraction Solutions Containing Ions Leached from
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.23 on Blanket and Loose
Fill Insulation.
Current edition approved Nov. 1, 2018March 1, 2019. Published November 2018March 2019. Originally approved in 1978. Last previous edition approved in 2018 as
C892 – 18.C892 – 18a. DOI: 10.1520/C0892-18A.10.1520/C0892-19.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C892 − 19
Thermal Insulation on Aqueous Corrosion of Metals
3. Terminology
3.1 Definitions—Terminology C71 and Terminology C168 shall be considered as applying to the terms used in this standard.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 fibers—the fibers shall be refractory oxides, processed from a molten state into fibrous form.
3.2.2 high-temperature fiber thermal insulation—a thermal insulation, varying in flexibility, composed of refractory inorganic
fibers, without binder added, and furnished in either flat sheets or rolls.
4. Classification
4.1 The general-type product governed by this specification is blanket or batt composed of inorganic refractory fibers.
4.2 Types—The product is separated into types based upon temperatures of use (Table 1).
4.3 Grades—The product is separated into grades based upon its maximum Apparent Thermal Conductivity values (see Table
2) and minimum Tensile Strength values (see Table 3).
5. Ordering Information
5.1 High-temperature fiber blanket thermal insulation is normally purchased on the basis of brand name, type, grade, length,
width, thickness, and total square footage as specified in the purchase order.
5.2 The type and grade for the intended service shall be as specified by the user with the assistance of the supplier where
desirable.
5.3 The purchaser shall be permitted to specify, inspect and sample the material.
5.4 When a certification or test report, or both, is required, this shall be specified by the purchaser.
6. Materials and Manufacture
6.1 Composition—High temperature fiber thermal insulation shall be composed of fibers, made of metallic oxides of, but not
limited to, silicon, aluminum, calcium, and magnesium. The raw materials, processed from the molten state into spun fibers, are
then mechanically interlocked through a needling process into insulation blanket felts with out the use of chemical binders.
7. Physical and Mechanical, and Chemical Properties Requirements
7.1 Apparent Thermal Conductivity shall conform to the requirements of Table 2 when tested in accordance with 11.1.2.
7.2 Tensile Strength—shall conform to the requirements of Table 3 when tested in accordance with 11.1.5.
7.3 Flexibility—shall be classified as flexible when tested in accordance with 11.1.7.
7.4 Maximum Use Temperature—shall conform to the requirements of 4.2 when tested in accordance with 11.1.4.
7.5 Non-fibrous content (shot)—shall be limited to a maximum of 30 % by weight when testing in accordance with 11.1.3.
7.6 Linear Shrinkage—shall be limited to a maximum of 5 %, after exposure to the Maximum Use Temperature, in accordance
with 11.1.4.
8. Dimensions, Mass, and Permissible Variations
8.1 Rolls or flat sheets of blanket are normally furnished in standard dimensions as shown in Table 4, Table 5, and Table 6.
8.2 The standard length, width, and thickness combinations available are a function of the type and grade. Contact the supplier
for information on standard or non-standard dimension and combinations.
8.3 The maximum density (determined in accordance with Test Method C167) specified in Table 4 for Grades 3, 4, 6, 8, 10,
and 12 are for weight design purposes only.
TABLE 1 Classification by Type
Type Temperature of use, °F (°C), maximum
I 1350 (732)
II 1600 (871)
IIA 2000 (1093)
III 2300 (1260)
IV 2600 (1427)
V 3000 (1649)
C892 − 19
TABLE 2 Apparent Thermal Conductivity, maximum Btu in./h·ft ·F (W/m·K) at Mean Temperature, °F (°C)
Grade 75 (24) 200 (93) 400 (204) 800 (427) 1200 (649) 1600 (871) 2000 (1093)
3 0.52 (0.075) 0.56 (0.081) 0.73 (.105) 1.32 (.190) 2.42 (.348) 4.05 (.583) 5.94 (.855)
4 0.50 (0.072) 0.54 (0.078) 0.68 (.098) 1.13 (.163) 2.15 (.349) 3.53 (.508) 5.47 (.787)
6 0.42 (0.060) 0.47 (0.068) 0.59 (.086) 1.03 (.149) 1.91 (.276) 3.06 (.440) 4.75 (.604)
8 0.41 (0.059) 0.46 (0.066) 0.56 (.081) 1.01 (.146) 1.67 (.241) 2.60 (.374) 4.18 (.682)
10 0.40 (0.058) 0.45 (0.065) 0.55 (.079) 0.98 (.141) 1.61 (.231) 2.31 (.333) 3.63 (.523)
12 0.37 (0.053) 0.43 (0.062) 0.53 (0.076) 0.96 (.138) 1.43 (.206) 2.11 (.304) 3.14 (.451)
TABLE 3 Tensile Strength, Minimum
Tensile Strength,
Grade
lb/in. (KPa)
3 1.0 (6.9)
4 1.5 (10.3)
6 2.0 (13.8)
8 3.0 (20.7)
10 4.0 (27.6)
12 5.0 (34.5)
TABLE 4 Density, Maximum and Minimum
Minimum Density , Maximum Density ,
Grade
3 3 A 3 3 B
lbs/ft. (kg/m ) lbs/ft. (kg/m )
3 2.5 (41) 4 (64)
4 3.4 (54) 5.5 (88)
6 5.1 (82) 8 (128)
8 6.8 (109) 10.5 (168)
10 8.5 (136) 13 (208)
12 10.2 (163) 16 (256)
A
Minimum density limitations is for the purpose of maintaining structural
properties.
B
Maximum density limitations are for the purpose of providing design information
for stress analyses of pipe and equipment.
TABLE 5 Thickness Dimensions
Thickness, in. (mm) Tolerance
1 1 1
⁄16 (1.6) + ⁄32, – ⁄64 in. (+0.8, -0.4mm)
1 1 1
⁄8 (3.2) + ⁄16, – ⁄32 in. (+1.6, -0.8mm)
3 3 3
⁄16 (4.8) + ⁄32, – ⁄64 in. (+2.4, -1.2mm)
1 1 1
⁄4 (6.4) + ⁄4, − ⁄8 in. ( +6.4, −3.2 mm)
3 3 1
⁄8 (9.5) + ⁄8, − ⁄8 in. ( +9.5, −3.2 mm)
1 1 1
⁄2 (12.7) + ⁄2, − ⁄8 in. ( +12.7, −3.2 mm)
3 3 1
⁄4 (19.1) + ⁄4, − ⁄8 in. ( +19.1, −3.2 mm)
3 1
1 (25.4) + ⁄4, − ⁄8 in. ( +19.1, −3.2 mm)
1 3 1
1 ⁄2 (38.1) + ⁄4, − ⁄8 in. ( +19.1, −3.2 mm)
3 1
2 (51.0) + ⁄4, − ⁄4 in. ( +19.6, −6.4 mm)
TABLE 6 Width Dimensions
Width, in. (mm) Tolerance, %
12 (305) −2, +10
18 (457) −2, +10
24 (610) −2, +10
36 (914) −2, +10
39 (991) −2, +10
42 (1067) −2, +10
48 (1219) −2, +10
72 (1829) −2, +10
9. Workmanship, Finish, and Appearance
9.1 The insulation shall indicate good workmanship in fabrication by a uniform appearance, shall not have visible defects such
as tears and holes that will adversely affect the service quality, and shall be free from foreign materials.
C892 − 19
TABLE 7 Length Dimensions
A
Length, in. (mm) Tolerance
36 (914) −0
48 (1219) −0
84 (2134) −0
96 (2438) −0
144 (3658) −0
150 (3810) −0
180 (4572) −0
288 (7315) −0
300 (7620) −0
312 (7925) −0
600 (15240) −0
A
Not limited—excess is permitted.
10. Sampling
10.1 The insulation shall be sampled for the purposes of test in accordance with Practice C390. Specific provision for sampling
shall be agreed upon between the supplier and the purchaser.
11. Test Methods
11.1 The properties enumerated in this specification shall be determined in accordance with the following test methods:
11.1.1 Dimensional Measurement and Density—Test Methods C167. Density is based on nominal thickness.
11.1.2 Apparent Thermal Conductivity—Test in accordance with Test Method C177 or C201 (modified by the procedure shown
in Annex A1).
11.1.2.1 Practice C1058. shall be used to obtain recommended test temperature combinations for testing purposes.
11.1.2.2 As specified in Practice C1045, the range of test conditions must include at least one test where the hot surface
temperature is greater than, or equal to, the hot limit of the temperature range of desired data and at least one test where the cold
surface temperature is less than, or equal to, the cold limit of the temperature range desired. The exception to this requirement is
given in 11.1.2.2(1) below. At least two additional tests shall be distributed somewhat evenly over the rest of the temperature range.
(1) In cases where the maximum temperature of the C177 test device is exceeded by the required hot surface temperature as
stipulated in 11.1.2.2, it is acceptable to operate one hot plate at the C177 upper temperature limit and the other hot plate at the
lower temperature that gives the target mean temperature.
11.1.2.3 Final analysis of the thermal data shall be conducted in accordance with Practice C1045 to generate a thermal
conductivity versus mean temperature relationship for the specimen. Practice C1045 and the specific hot and cold surface
temperatures is required to determine the effective thermal conductivity for comparison to the specification requirements.
11.1.2.4 Final step of Practice C1045 analysis would be to calculate the thermal conductivity using the equations generated at
a set of mean temperatures for comparison to the specification.
(1) While it is recommended that the specification data be presented as conductivity versus temperature, it is possible that
several existing specifications will contain mean temperature data from tests conducted at specific hot and cold surface
temperatures. In these cases, it is possible that the conductivity will be a as a function of temperature and that the Practice C1045
analysis will provide different results. To ensure that the data is compatible, a Practice C680 analysis, using the conductivity versus
temperature relationship from Practice C1045 and the specific hot and cold surface temperatures, is required to determine the
effective thermal conductivity for comparison to the specification r
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