Based on recent news media coverage of persons slipping
on newly installed ceramic tiles in the New York City
subway, the writer contacted Mr. Seymour Portes,
Metropolitan Transportation Authority program manager for
station rehabilitation, and John Penta of Caeser Ceramics.
Mr. Penta, the importer of the subject tiles which are
manufactured in Italy, supplied the writer with 2 sets of
12" square by 1/2" thick ceramic tiles. Each set
contained one of the newly installed tiles, and one of the
proposed replacement tiles. The newly installed tile
contains feldspar and is identified as "Orion"
tile, while the proposed replacement tile does not contain
feldspar, and is referred to as "Pegaso".
| "Orion" Tile - Front & Back
|| "Pegaso" Tile - Front & Back
The American Society for Testing & Materials
International (ASTM) C1028 test method, the ceramic tile
industry standard used for measuring static coefficient of
friction (SCOF), was performed on both tiles by the SGS/USA
Testing Co., Fairfield, NJ.
The Voices of Safety International (VOSI) V41.21 -
"Universal Specification Test Method for Slip Resistant
Walkways, in the Field & Laboratory as Measured by a
Drag Type Friction Tester" was performed on both tiles
in the Technical Products Co. laboratory in N. Caldwell,
The test results are summarized in the following tables: