

Table 7 



. - -Technical mixing data 1 

 (as used in this study) 







Retardant 



Manufacturer 



Composition 



: Chemical added to 

 : 1 gallon water 2 









Grams 



Lbs. 



Gelgard 



Dow Chemical Co. 



Proprietary 



5.40 



0.0120 



Algin-gel 



Kelco Company 



Sodium alginate 

 CaCl 2 



Paraformaldehyde 



18.90 

 1.98 

 .38 (cc) 



.0416 

 .0044 

 .0009 



Bentonite 



American 

 Colloid Co . 

 and others 



High sodium swelling 

 bentonite clay 



340.00 

 313.20 



3 .75 

 4 .72 



Phos-Chek 202 



Monsanto Co. 



Sodium carboxymethyl- 

 cellulose, diammonium 

 phosphate, corrosion 

 inhibitor, preservative 



518.00 



1.14 



Fire-Trol 



Arizona Agri- 

 chemical Co. 



Attapulgite clay, ammo- 

 nium sulfate, corrosion 

 inhibitor 



1,271.00 



2.78 



1 Materials are mixed in amounts generally according to information in "Chemicals for 

 Forest Fire Fighting," NFPA, 1963. 



2 Directions for mixing: 



1. Water used is local well water, except for mixing Gelgard, which requires distilled 

 water; water should be 73° F. 



2. All mixing reported here was done with the Pacific Southwest Forest and Range 

 Experiment Station's high- shear impeller driven at 2,380 r.p.m. 



3. Viscosity should be determined by the following procedure, using Brookfield model 

 LVF viscometer, at spindle speed of 60 r.p.m.: 



a. Mix and let stand at least 18 hours. Record mixture temperature. 



b. Slosh container around for 20 seconds and fill a 1,000-ml. beaker. 



c. Let mixture stand 3 minutes. 



d. Run viscometer 1 minute, then take 3 readings. 



e. Raise spindle out, stir mildly and replace spindle. 



f. Repeat viscometer run as in (d) and (e) above. 



g. Repeat (e) and (f) above: will make 3 runs of 3 readings each. 



3 Drying test. 



4 Burning test. 



28 



