SPECIFICATIONS: All chalkboard shall be Vitracite
and all markerboard shall be LCS, by Claridge Products and
Equipment, Inc., Harrison, Arkansas, manufactured as follows:
METHOD OF MANUFACTURE: DuPont process as originally
developed by E. I. DuPont de Nemours and Co., Inc. for modern
porcelain enameling techniques.
FACE SHEET: As specified by architect, either 24 gauge
Vitracite for chalkboards or 24 gauge LCS markerboards. Color shall
be as selected.
CORE MATERIAL: As specified by architect. Select from 1/4”
hardboard (115), 3/8” duracore (116) or 3/8” particle board (118).
PANEL BACKING: As specified by architect. Select from foil
backing (F), .015 Aluminum Sheet (A) or Steel (S).
LAMINATIONS: Shall be hot-type neoprene contact adhesive
applied to both surfaces automatically. Each substrate to have a
minimum of 80% covering with 1.5-2.0 dry mils of adhesive. Panel
components shall have uniform pressure applied mechanically over
entire area. Laminations shall be made by face sheet manufacturer.
SIZES: All 24 gauge chalkboards and markerboards shall be
available up to 16’ in one piece. Standard height is 4’. No joints,
cracks or writing surface interruptions of any type shall be
permitted in spaces under 16’.
BRITTLENESS AND CHIPPING: Chalkboards or markerboards with
high-fired brittle ground and finish coats are not acceptable.
FIRING TEMPERATURES: Enamel shall be fired at
approximately 1000° F. or lowest possible temperatures thereunder to
reduce steel and porcelain stresses and achieve superior enamel bond
INSTALLATION, CLEANING AND BREAKING-IN: Shall be in exact
accordance with manufacturer’s printed instructions. No breaking-in
shall be required.
QUALITY ASSURANCE: All chalkboard and markerboard surfaces
shall comply with Porcelain Enamel Institute’s