Angelus Block offers an extensive selection of standard and special order integral colors. (See Colors & Textures.) Your representative can offer samples and specific information to assist in color specifications.
Cmu manufactured by Angelus Block are of the highest quality and uniformity available. However, variations may occur in color and shade, in natural gray or integral color, as a result of color ranges in raw materials over which we have no control. A statement of color, then, refers to a range of color. As natural raw materials from the same source can change over time, exact color duplication from run to run cannot be guaranteed.
Color will be affected by differences in weight (density) or strength. A weight classification will require a specific aggregate mix, which will create its own natural gray and have an effect on any added coloring agent. For example, a color in Medium Weight will differ somewhat from the same color in Lightweight. Similarly, High-Stress units have a different mix design; as a result, their color will not be exactly the same as non-High-Stress units. Contact your representative should the weight or strength to be specified differ from that indicated on a given sample.
Occasionally, new construction may be required to match an existing wall or structure, dictating the color of new cmu match the color of existing cmu. This circumstance raises a host of considerations such as the age and extent of weathering of the "old" cmu, possible differences in aggregate from the time of its manufacture to the present, and the fact that a good match now may not last as the "new" cmu weathers.
We strongly suggest that specifications for such a project avoid the simplicity of the "match existing" statement. Instead, we recommend consulting your Angelus Block representative to determine the availability and/or feasibility of current materials to reasonably match the existing wall and whether the best solution would be integral color or staining natural gray to best match existing cmu. It is advantageous for everyone involved if this is specified in advance of the masonry bid, much more the start of the masonry work, thereby avoiding last minute scrambling for suitable materials.
Sources of raw materials may differ from plant to plant. So, too, color may differ from plant to plant. One location's gray or color may not match another location's gray or color. Even if they bear an identical color name, product from one plant should not be mixed with another's if it is intended they match. Consult your representative for color compatibility from plant to plant.
White CMU in particular are dependent upon aggregates to achieve its appearance. Though we strive to obtain raw materials from stable sources, such light-colored materials are subject to changes in color and in general availability.