UNE-EN 9185:2008

PROTECTIVE CLOTHING. EVALUATION OF THE RESISTANCE OF MATERIALS TO SPLASHES OF MOLTEN METAL

Equivalent to European Standard EN ISO 9185:2007 cancels and replaces UNE-EN 373:1994.
This international standard specifies a method to evaluate the resistance to heat penetration of materials intended for use in the area to protect against large salpicaduras of molten metal. Proporciona procedimientos specíficos para la evaluación de los efectos de las salpicaduras de aluminio fundido, criolita fundida, cobre fundido, hierro fundido y acero templado fundido.

Conditioning 24h 20ºC ± 2 65% HR
Place the sample without tension, but free of wrinkles and folds, on a flat and smooth surface. First, mark and cut seven test samples.

Metals and cryolite.
PVC sensor film consisting of a rough PVC sheet, mass per unit area (300 +/- 30) g/m2.
Crucible, whose approximate external dimensions are 97 mm in height, 80 mm in upper diameter, 56 mm in lower diameter and 190 ml capacity (full to the brim).
Removable crucible support.
Furnace, capable of operating at a temperature of 100ºC above the pouring temperature. The type of furnace can be either muffle or induction.
Temperature probe, or an optical non-contact temperature measurement instrument, capable of measuring temperatures of molten metals up to 1.650ºC with an accuracy of +/- 10 º C.
Pouring device, a system for rotating the pouring device at a constant angular speed, a sample holder with support structure and a sand tray.
Scale, capable of weighing with an accuracy of 1,0 g.

Pretreated materials are tested by pouring quantities of molten metal onto the supported test specimen at an angle defined by the material. Damage is assessed by placing a rough thermoplastic PVC sensor film directly behind the textile. Roughness changes in the film after pouring are critical; and the adherence of the metal to the tissue surface is noted.
The pouring device is provided with crucibles for melting metals in a muffle furnace, a temperature probe and pouring equipment equipped with a constant angular velocity and defined angle rotation system.
The composition of the materials to be tested is defined (Aluminium, Copper, Iron, C25 tempered steel and Cryolite), its pouring temperature in ºC, the height in mm and the angle of the sample to be tested with the horizontal.
As this International Standard is only a test method, it does not specify performance levels for materials, but allows comparisons to be made between them in terms of the protection provided against specific molten metals and cryolite. The following “furnace withdrawal temperatures” are practical for the given metals, using an induction furnace, and will allow the ideal pour temperatures to be achieved.
The temperatures to which metals are heated in the furnace must be:
- Aluminum: 820ºC
- Copper: 1350º C
- Iron: 1500º C
- Tempered steel: 1650º C
- Cryolite: 1200º C
Table of pour temperatures, pour heights, and angles of the sample to the horizontal for various molten metals:

Iterative tests will be carried out increasing/decreasing the amount of molten metal to determine the resistance of the material to molten metal.

It must include:

A reference to this International Standard.
For each individual test sample, the approximate mass of metal used (see 9.2), whether molten metal adhered to the material, the result of the PVC film assessment, and the mass of molten metal or cryolite poured.
the rate of molten metal or cryolite spatter.
The specific cryolite metal or source used, the pouring temperature, the angle of the sample with the horizontal, and the pouring height.
Any deviation from the test procedure that is likely to have had an influence on the test result.