Typical Wet-spinning solvents and Coagulants.
ISO Fiber Class
FTC Fiber Class
Chemical Structure of Fiber
Solvent
Coagulant
Coagulant  Concentration, %
viscose rayon cellulose aqueous solution of sodium salt and xanthate ester dilute sulfuric acid + sodium sulfate + zinc sulfate

water

 7-10
modal rayon   aqueous solution of sodium salt and xanthate ester dilute sulfuric acid + sodium sulfate + zinc sulfate 10
cupro cupra cellulose aqueous cuprammonium hydroxide water  
alginate calcium salt of alginic acid aqueous solution of sodium salt of alginic acid slightly acidic aqueous calcium hydroxide
protein  azlon arachin, zein, or casein dilute sodium hydroxide dilute sulfuric acid + sodium sulfate  
acrylic acrylic copolymer of acrylonitrile 
(<85 wt %) with other 
monomers		 dimethylformamide

dimethylacetamide (DMA)
Dimethyl sulfoxide
 
 

50% sodium thiocyanate
60% zinc chloride
70% nitric acid
90% ethylene carbonate

 50 % aqueous dimethylformamide

50% aqueous dimethylacetamide
50% aqueous dimethylsulfoxide

10% sodium thiocyanate
30% zinc chloride
30% nitric acid
30% ethylene carbonate
17-25
 

20

20
 

10-15
10
10
15-20
modacrylic modacrylic copolymer of acrylonitrile,
35-85 wt%, with other 
monomers		 acetone, up to 50% acrylonitrile

dimethylformamide (DMF)
>50% acrylonitrile

 aqueous acetone

aqueous dimethylformamide

 15-25
vinylal vinal poly(vinyl alcohol), posttreated with formaldehyde water aqueous sodium sulfate 10-18
aramid aramid poly(p-phenylene-
terephthalamide)		 100% sulfuric acid water or dilute sulfuric acid 20
elastine spandex segmented polyurethane DMF
DMA		 30% aqueous DMF
30% aqueous DMA		 18-30

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Reference:

 Kroschwitz, Jacqueline I. Encyclopedia of Polymer Science and Engineering. Second Edition, Vol. 6. John Wiley & Sons.  New York.  1986 pp. 812-815.