TM 1-1520-240-BD l. Application  of  Adhesive  System  No.    9  (Option 2). WARNING The    adhesives    under    this    system may  produce  skin  irritation.    Avoid bodily contact with the adhesives. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.)  Clean  faying  surfaces  using  methyl-ethyl- ketone. (2) Thoroughly blend 100 parts, by weight, of base   with   10.9   parts   by   weight,   of   catalyst   NOTE Thorough  blending  is  extremely  important.    A  50-gram batch of adhesive will usually require at least 6 minutes of constant, vigorous stirring. (3) Apply  a  thin  coat  of  blended  adhesive  to both faying surfaces. (4) Join  parts,  applying  sufficient  pressure  to ensure solid contact. NOTE A     continuous     bead     of     adhesive squeeze out indicates solid contact. (5) Remove  excess  adhesive  using  methyl- ethyl-ketone. (6) Cure  adhesive  for  30  minutes  at  240°F (116^oC),   then   increase   temperature   to   350°F   (117^oC) and allow adhesive to cure for 1-1/2 hours. m. Application of Adhesive System No.  10. WARNING The adhesives under this system are toxic.   Work   only   in   well-ventilated areas. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.) Clean all faying surfaces using methyl-ethyl- ketone. (2) Thoroughly   mix   each   component   in   its own container. (3) Thoroughly  blend  30  parts,  by  weight,  of accelerator with 100 parts, by weight, of base. (4) Apply a uniform coat of blended adhesive to both faying surfaces. (5) Join  parts,  applying  sufficient  pressure  to ensure solid contact. (6) Remove    adhesive    squeeze    out    using methyl-ethyl-ketone. (7) Allow the adhesive to cure for 12 hours at 70°F (21 °C).  Full cure is attained after 48 hours. n. Application of Adhesive System No.  11. WARNING The adhesives under this system are toxic  and  flammable.    Work  only  in well-ventilated areas away from flame. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.)   Clean   all   faying   surfaces,   using   methyl- ethyl-ketone. (2) Thoroughly  blend  base  with  activator  in accordance with instructions on container. (3) Apply  a  thin  uniform  coat  of  adhesive  to both faying surfaces. (4) Assemble parts immediately, apply sufficient pressure to ensure solid contact. (5) Allow adhesive to cure at 70^oF (21°C) for one  of  the  following  periods  of  time,  depending  upon class of adhesive used; (a) Class B-1/2 - 16 hours (b) Class B-1 - 36 hours (c) Class B-2 - 48 hours (d) Class B-4 - 60 hours NOTE The above cure times are for handling     only.     Full     cure     is     not achieved for 7 days or more. 2-55