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TECHNICAL REPORT NO. 167 Investigation Ko. 1 - Progress Report No. 2
Mr, G. E. Wilson
Mr. E. B. Hoi1ingsworth
Mr. T. W. Richards
Mr. A. T. Kiebergall
Hr. 0. E. Burch
Mr. D. C. Corkill
Hr. J. B. Moss
Mr. G. F. Fowler-- -
File (3)
............... ..............
cc: Joint System Plant Managers
Issued by: Tigard Lab
Division: Gypsum
Wr i t ten bv: V?. K. Gettel G. F. F ov: 1 e r
Approved by:
f,
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Date: December 11, 1975
COMPETITIVE SURVEY READY MIX JOINT CEMENT PRODUCTS
Objective:
To evaluate the ready mix products being marketed by our competitors.in order to assess the competitive position of Georgia-Pacific ready mix products.
Procedure:
Samples of our strongest competitors in each sales area were shipped to Tigard by plant personnel. Upon their arrival, each sample was placed in an unmarked numbered container to assure objectivity of the tester involved. The samples were then subjected to a series of 19 quantitative tests in order to test performance as thoroughly as possible.
Number values were used as much as possible in an effort to describe performance.
CONCLUSIONS
The G-? products tested were generally equal to or better than most of the competitive products. A conclusion on each property tested follows:
Viscosities: Our current shipping viscosity of 5S0 + 20 for hand mix is close to ideal.
Bonds: This property appears to be quite satisfactory. Noted is an improvement in several competitors' cold bond, since the last competitive survey was completed.
TECHNICAL REPORT NO, lb 7 Investigation No. 1 Progress Report No. 2
Sanding: Sanding properties are probably adequate at all plants. Im provements could probably be made at some plants. However, this could result in bond deterioration and loss of water resistance. Cracking: Room cracking appears to be competitive. Fan cracking needs improvement. Open Time: This property appears to be satisfactory. One Milford sample had an unusually long open time. This variation and other abnormalities would indicate a possible double loading of water retention agent in this ba tch. Water Resistance: No need for improvement was noted. Reflection: (brightness) Our products show an average performance that would require additional cost to improve. Wet Density/% Solids: Our products would appear to be acceptable. Generally, these two properties are fairly complicated. All the products tested were in the same general range and being proportional to the viscosity. Contains Asbestos: Five of the 28 products did not contain asbestos. These are regarded as inferior to the asbestos products because of poorer working properties and unstable viscosity. Filler Type: Four U.S.G. samples contain a blend of gypsum and limestor Perhaps economics and/or performance has required this switch. Also, three of the "Blends" are asbestos free. Adhesive System: Although only one sample contained starch, it is known that several other small companies are presently using starch and/or a st2rch-vinyl combination. Boric Acid: This Is the only property in which we are not competitive. However, the important thing is that we now recognize this deficiency.
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