ASTM C892 PDF
This standard is issued under the fixed designation C ; the number immediately 1 This specification is under the jurisdiction of ASTM Committee C on. ASTM C Standard Specification for High-Temperature Fiber Blanket Thermal Insulation. ASTM C Standard Specification for High-Temperature Fiber Blanket Thermal Insulation. standard by ASTM International, 05/01/ This document has.
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Design limitations in the C apparatus limit the ability to make thermal performance determinations over the lower half of the C temperature range. Different Tools Are More Accurate for Different Measurements—Despite the conflicting definitions, the two sets of numbers should be consistent after the appropriate mathematical adjustments are made; that they v892 not suggests that different methods are more accurate for different applications.
Exploring Insulation Materials – Insulation Outlook
With ASTM C, the measured thermal conductivity value associated with a specific temperature is the actual value of thermal conductivity at that mean temperature—i. If two companies manufacturing the same generic material use different test procedures, it is challenging and perhaps even impossible for users to compare performance of the two materials. Additionally, asm organizations need to be able to specify materials using industry standards and reference standard test procedures.
If the thermal conductivity-mean temperature relationship is linear, or nearly linear, this approach will suffice. The answer appears to have two roots: This specification covers the standard for high-temperature fiber blanket thermal insulation for use at various temperatures.
Exploring Insulation Materials
Test method C measures average thermal conductivity1 taking two temperature points one at a very low temperature c8922 one at a very high temperaturecalculating the average of those two data points, and designating that the average for the entire range.
C lists quite different thermal conductivity values one for each of the two methods for this grade, shown in Table 2. The C values range from 33 percent greater to 1 percent lower, depending on the mean temperature.
Also, this type of fiber insulation is typically dimensionally stable with exposure to the maximum rate temperature for the particular type I, II, or III.
The insulation shall also be tested for non-fibrous content, linear shrinkage, and tensile strength. The two methods are thus complementary for application over the entire C temperature range.
Add to Alert PDF. The values given in parentheses are mathematical conversions to SI units which are provided for cc892 only and are not considered standard. The liquid binder consists of a mixture of both organic and inorganic colloidal silica materials, and is typically added in sufficient quantity to provide the fibers with necessary adhesion to the applied surface; cohesion to one another; and the required physical properties of the installed, dry insulation.
Their business histories over the first 11 years show striking similarities—and differences: You may delete a document from your Alert Profile at any time.
These insulation products are available in flat sheets, rolls, boards, or loose fibers. Definition Difference With ASTM C, the measured thermal conductivity value associated with a specific temperature is the actual value of thermal conductivity at that mean temperature—i. This standard is also available to be included in Standards Subscriptions. The guarded hot plate test method could be considered a primary resource for generating new thermal conductivity data, and C tests could be used for the top end of the temperature range.
Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard. ASTM materials standards can list typical or limiting values as a guide for comparing available products and making informed purchase decisions.
Link to Active This link will always route to the current Active version of the standard. These AES fibers are designed to be bio-soluble i. The insulation should be tested and comply accordingly to physical and mechanical properties of the insulation such as apparent thermal conductivity, density, and temperature of use.
Note that there are 11 data points, since 8c92 curve has a beginning and ending data point.
Each different type of material is designed to perform in particular applications over aetm particular temperature range. The different approaches illustrate that the average thermal conductivity value over a large temperature range, in general, can be significantly different from the thermal conductivity value at the average temperature of that range. Their business histories over the first 11 years show striking similarities—and differences:.
Choosing the Right Method for Given Conditions The C method was originally developed for rigid, higher density refractory materials with thermal conductivity values 3 to 10 times greater than those for typical thermal insulation materials.
In most cases, the values for a specific grade at a specific mean temperature are significantly different.
ASTM C – Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. This standard is not included in any packages.
The fibers are made from mineral substances such asym silica, alumina, calcium, and magnesium processed from the molten state into fibrous form. If the document is revised or amended, you will be notified by email. Conclusions and Recommendations Material and test standards for thermal insulation materials provide valuable support to specifiers, designers, and users working with high-temperature products.
Jill calculated her average three ways, getting different answers each time: