SIST EN 12430:2013

SIST EN 12430:2013 is the Slovenian adoption of EN 12430:2013 from CEN. It specifies equipment and procedures for determining how thermal insulating products for building applications behave when a force is applied to a small area at a given speed. Engineers, laboratories, quality managers and buyers use it to check whether these products can withstand direct loads during installation or use, especially pedestrian traffic.

What does SIST EN 12430:2013 specify?

SIST EN 12430:2013 covers a test method for thermal insulating products and the way the results are reported. It also includes a special normative annex for cellular glass products.

The standard is organized into clauses 1 to 10, covering scope, references, terms, principle, apparatus, test specimens, procedure, calculation and expression of results, accuracy of measurement, and the test report.

A note in the scope says the main method and Annex A are reported and interpreted differently, so their results are not suitable for direct comparison. In practice, that matters when choosing the right method for the product type.

What are the key requirements of SIST EN 12430:2013?

SIST EN 12430:2013 requires a point load test that presses on a small area of a square test specimen in the direction normal to its major faces. The result is the compressive force at the critical point and/or the force at a specified deformation.

Test principle and equipment

Clause 4 applies the load with an indentor moving at a given speed, perpendicular to the major faces. Clause 5 specifies a compression testing machine, a cylindrical steel indentor of 79.8 mm diameter, displacement measurement, force measurement and a recording device for the force-deformation curve. In practice, the setup must let you record both force and displacement continuously.

Test specimens

Clause 6 requires specimens at the original product thickness, with skins, facings and coatings retained. The usual specimen size is 300 mm x 300 mm, unless a relevant product standard or other European Technical Specification says otherwise. If no number is given, use at least three specimens. This matters because specimen preparation can change the measured behaviour.

The same clause also requires the specimen to be cut so the base is normal to the direction of compression in use, and stored for at least 6 h at 23 °C ± 5 °C. For disputes, the conditioning atmosphere is 23 °C ± 2 °C and 50 % ± 5 % relative humidity.

Procedure and stopping point

Clause 7 sets the test conditions at 23 °C ± 5 °C, or the dispute conditions above. The test uses a preload of 2.5 N ± 0.25 N, a constant speed of 50 mm/min ± 5 mm/min, and continues until the critical point can be determined and/or the deformation reaches 20 %. In practice, this means the operator must capture the full force-deformation response, not only a single load value.

Results, accuracy and report

Clause 8 says results are mean values, expressed to two significant figures, and not extrapolated to other thicknesses. The standard allows reporting force at the critical point, point load at a chosen deformation such as 5 mm, or the full force-deformation curve when there is no yield point. Clause 9 gives estimated repeatability and reproducibility from round robin experience, using ISO 5725-2 terms. Clause 10 lists what the test report must include, especially product identification, sampling and conditioning details, deviations, and all individual and mean results.

Cellular glass products

Annex A replaces parts of the general method for cellular glass. It adds a positioning device, uses full-size products or quarter sections, changes the preload and loading rate, requires testing both major faces, and defines a deformation result based on the net displacement between 100 N and 1 000 N. For cellular glass, this is the method to follow if you need the product-specific result.

What terms does SIST EN 12430:2013 define?

• Point load - a compressive force applied by a circular indentor with a 50 cm2 cross section.
• Critical point - the point on the force-deformation curve where a tangent separates from the curve.
• Force-deformation curve - the recorded relationship between applied force and resulting displacement during the test.
• Compressional force at the critical point, Fp - the force value taken at the critical point and reported in kilonewtons.
• Deformation at the critical point, εFp - the deformation measured at the critical point, reported in millimetres.
• Pd - the deformation result used in Annex A for cellular glass products, based on the net displacement under 100 N and 1 000 N.

Who uses SIST EN 12430:2013?

SIST EN 12430:2013 is used by testing laboratories, manufacturers of thermal insulating products, and specifiers of building insulation. Quality managers use it for product control and comparison of test results, while buyers and technical reviewers use it to check whether a product can resist direct point loads in service. It is especially relevant for products used in building applications and for cases where pedestrian traffic may apply local loads.

What changed in SIST EN 12430:2013 from the previous edition?

SIST EN 12430:2013 supersedes EN 12430:1998. The foreword states that the revision contains no major changes, only minor editorial corrections and clarifications.

Which standards are used with SIST EN 12430:2013?

• EN 12085 - used for measuring the linear dimensions of test specimens before testing.
• ISO 5725-2 - used for the accuracy terms applied to repeatability and reproducibility.
• Relevant product standard or other European Technical Specification - used where the standard allows the number of specimens, special dimensions, test conditions, or result expression to be specified.

What does the SIST EN 12430:2013 document contain?

The document contains the test principle, apparatus details, specimen preparation rules, test procedure, calculation rules, accuracy information and a reporting checklist. It includes figures for the test setup, the specimen and the cylindrical indentor, plus force-deformation curve examples. Table 1 gives estimated accuracy values, and Annex A includes figures showing indentor positions for cellular glass products and a modified procedure for that product family. The report clause is practical for laboratories because it shows exactly which product, sampling and result details should be recorded.