This standard is issued under the fixed designation C ; the number immediately 1 This test method is under the jurisdiction of ASTM Committee C- 16 on. ASTM C () Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus. Annual. Our calibrated hot box is one of the largest in the country accepting test assemblies up to 9’x16′. Its design allows any orientation from fully vertical to fully .

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We have no amendments or corrections for this standard. Detailed designs conforming to this standard are not given but must be developed within the constraints of the general requirements. Subscription pricing is determined by: If the document is revised or amended, you will be awtm by email. The astmm principles of the hot box method can be used to construct an apparatus to measure the heat flow through industrial systems at elevated temperatures.

Some hot boxes are limited to planar or nearly planar specimens.

The same apparatus may be used in several orientations but may require special design capability to permit repositioning to each orientation. In this somewhat typical scenario, three factors complicate the R-value calculation. A structure that axtm cavity spaces between adjacent surfaces, for example, an attic section including a ceiling with sloping roof, may astn difficult to test properly.

Whatever the test orientation, the apparatus performance shall first be verified at that orientation with a specimen of known thermal resistance in place.

astmm As we know from the Second Law of Thermodynamics, energy moves from hot towards cold. To learn more about how Hot Box testing can help your success in the market, contact us. Practice C may be used as asrm guide for test specimen conditioning. However, several atsm box apparatuses have been operated under dynamic non-steady-state conditions after additional characterization 1.


If the hot box apparatus has c3163 designed, constructed and operated in the ideal manner, no further calibration or adjustment would be necessary. The preconditioning parameters shall be chosen to accurately reflect the test samples intended use and shall be documented in the report. The test utilizes an apparatus known as a guarded hot box.

The Hot Box removes any concerns that modeling parameters and assumptions are incorrect because the test is conducted on actual wall or ceiling specimens, allowing our building science experts to determine the answer with a high degree of confidence. When constructed to measure heat transfer in the vertical direction, the hot box is used for testing roof, ceiling, floor, and other horizontal structures.

For example, in some specimens, especially those containing empty cavities or cavities open to one surface, the overall resistance or transmittance will depend upon the temperature difference across the test specimen aetm to internal convection. So once we know the temperature difference across the test specimen and the heat flow, we can calculate the R-value or U-value.

The equipment performing these measurements requires calibration to ensure that the data are accurate. Assurance Testing Inspection Certification. Global Zstm Intertek is the industry leader with over 42, people in 1, locations in over countries. If no applicable standard exists, sound engineering judgment that reflects accepted heat transfer principles must be used and documented.

This test method applies to building structures or composite assemblies of building materials for which it is possible to build a representative specimen that fits the test apparatus.

However, larger hot boxes have been used to characterize projecting skylights and attic sections. Standards Subsctiption may be the perfect solution.

These panels, or representative sections of the panels, have had their thermal performance measured on other devices that are directly traceable or have been favorably compared to a national standards laboratory.

See Annex A8 for the general method.

ASTM C1363

Additional characterization is required to insure that all aspects of the heat flow and storage are accounted for during the test. Data Providing materials insight through custom data and reports. Dynamic control strategies have included both periodic or c133 temperature cycles, for example, to follow a diurnal cycle. The direction of airflow motion under forced convective conditions shall be either perpendicular or parallel to the surface.


To gain this final confidence in the test result, it is necessary to benchmark the overall result of the hot box apparatus by performing measurements c1336 specimens having known heat transfer values and comparing those results to the expected values.

The operator shall note in the report any use of convection barriers.

Home Innovation ASTM C Hot Box | Home Innovation Research Labs

Many high performance wall systems now also have a layer of rigid foam. To adjust for any energy that goes through the Hot Box walls or tries to bypass through the specimen frame, we calibrate the box. This test method applies to building structures or composite assemblies of building materials for which it is possible to build a representative specimen that fits the test apparatus.

Please enter your email address. The general testing procedures for these cases are described in Annex A The hot box has two sides as illustrated in the diagram below: The equipment performing these measurements requires calibration to ensure that the data are accurate.

Large-Scale Hot Box

The hot box test method is more suitable for providing such data for large building elements, usually of a built-up or composite nature, which are exposed to temperature-controlled air on both sides. Link to Active This link will always route to the current Active version of the standard. For vertical specimens with air spaces that significantly affect thermal performance, the metering chamber dimension shall match the effective construction height. Testing Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards.