In 1976 a photometric evaluation of reflective sheetings was begun. Nine white reflective sheetings and ten yellow reflective sheetings were included in this study. For each color of each sheeting, five 15-inch square aluminum backed panels were prepared and placed on vertical racks on the sign shop roof in District 4 in Wisconsin Rapids. The panels were first put in place near the end of January, 1977. From 1977 to 1982, semiannual photometric evaluations of the sheetings were performed using a photometer. From 1983 to 1987, annual reflectivity measurements were obtained using a retroreflectometer. In addition to reflectivity measurements, amount of cold cracking was also measured. All photometer and retroreflectometer tests were taken at a divergence angle of 0.2 deg and at incidence angles of minus 4 deg and plus 30 deg. In addition to the five panels for each color of each sheeting, each white sheeting had an additionnal five panels prepared for the purpose of studying the effect of "stone bruising" on cold cracking. Artificial stone bruises were made on each of these panels (four bruises per panel, one bruise in each quadrant) by means of a dull center punch (the artificial bruise damaged the sheeting but not the aluminum). At the end of the study, ten years of field exposure yielded the following results: (1) Scotchlite--Type "H" sheeting had the "highest" reflective intensity of all the sheeting tested; (2) Seibulite--Engineer Grade had the "lowest" amount of cold cracking of all the sheetings tested; (3) Stone bruising did not have an adverse effect on reflective intensity; (4) Stone bruising did not have significant increase in cold cracking when compared to non stoned bruised sheeting; and (5) Fasign--Engineer Grade, Fasign--Construction Grade, Maclite--Engineer Grade, and Toshiba--Engineer Grade sheetings had lower reflective intensities, higher cold cracking and fading colors, and thus performed "poorly".

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 84 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00623655
  • Record Type: Publication
  • Report/Paper Numbers: Res Proj 0624-32-15, Study No. 76-4
  • Created Date: Jul 31 1992 12:00AM