TM 1-1520-240-BD g. Application of Adhesive System No.  5. WARNING The adhesives under this system are toxic and may produce skin irritation. Work   only   in   well-ventilated   areas and   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) If  adhesive  (item  27,  Table  2-5)  is  used, blend 100 parts, by weight, of part B with 140 parts, by weight, of part A. (3) If adhesive (item 118, Table 2-5) is used, thoroughly blend equal parts of components A and B to form  component  AB.    Thoroughly  blend  equal  parts  of components     C     and     D     to     form     component     CD. Thoroughly blend equal parts of the combined components AB and CD. (4) If adhesives (items 16, 18, 21, 19, 20, or 17, Table 2-5) are used, thoroughly blend equal parts of components AB and CD. (5) Apply   a   thin   uniform   coat   of   blended adhesive to faying surfaces. (6) Assemble parts and apply sufficient pressure to ensure solid contact. (7) Remove  excess  adhesive,  using  methyl- ethyl-ketone. (8) Allow adhesive to cure in accordance with one of the following cure cycles. (a) 30 to 60 minutes 200°F (93⁰C). (b) 2 hours at 170°F (77°C). (c) 8 hours at 120°F (490C). (d) 11 hours at 104°F (40°C). (e) 24 hours at 70 0F (21°  C). h. Application of Adhesive System No.  6. 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  faying  surfaces  using  methyl-ethyl- ketone. (2) Brush   two   coats   of   primer   (item   118, Table 2-5) on all surfaces, other than rubber.  Allow 45 minutes drying time after each coat. (3) Brush  a  uniform  coat  of  adhesive  (item 37, Table 2-5) on both faying surfaces, and immediately join coated surfaces. NOTE Exposure  to  air  for  more  than  a  few minutes  will  cause  adhesive  surface to dry, resulting in a poor bond. (4) Apply  sufficient  pressure  to  ensure  solid contact  but  not  enough  to  cause  excessive  adhesive squeeze out. NOTE A  bond  line  thickness  of  0.015  inch will give best results. (5) Allow  adhesive  to  cure  for  a  minimum  of 24 hours 70° to 800F (21.1 °  to 26.7°C). NOTE Complete  bond  strength  is  achieved after approximately 3 days. i. Application of Adhesive System No.  7. WARNING All  procedures  should  be  performed in   a   well   ventilated   area   and   away from   open   flame   as   the   adhesives contain toxic and flammable materials.  Hydrogen is generated by catalyzed adhesive during cure. Therefore,  all  containers  of  material should  be  vented  to  avoid  pressure buildup. (1) (Refer  to  Table  2-5  for  list  of  acceptable adhesives.)      Clean   all   faying   surfaces   using   methyl- ethyl-ketone. 2-53