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 3)  Cure the assembly for 2 hours minimum at 85 to 120°F.
 NOTE: Use a thermocouple to measure the temperature.
____
 4)  Let the assembly stay for at least 20 minutes before you apply the cure pressure.
 (e)  To apply the cure pressure, do these steps:
 1)  Apply a smooth constant pressure to the rub strip each 15 minutes during the first 2 hours after the parts are assembled.
 2)  Keep a continuous bead of the adhesive at the bond line to get a satisfactory bond between the mating surfaces. 3) Apply more pressure to remove air bubbles in the bond line as the adhesive cures in the assembly.
 TASK 51-51-00-308-034
 5.  Bonded Teflon Rub Pad Repair
____________________________
 A.  General
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 WARNING: TEFLON ETCHING MATERIAL IS CORROSIVE, TOXIC, FLAMMABLE, AND
_______ EXPLOSIVE. DO NOT BREATH THE VAPOR OR MIST FROM TEFLON ETCHING MATERIAL. DO NOT LET TEFLON ETCHING MATERIAL CONTACT YOUR SKIN, EYES OR CLOTHES. TEFLON ETCHING MATERIAL CAN CAUSE INJURY.
 (1)  We recommend the you follow these safety procedures.
 (a)  
Do not breath the vapor or mist. You must etch the teflon rubstrips in a ventilated area. If it is possible, etch the teflon rubstrips under a ventilation hood.

 (b)  
Keep all flammable material away from a source of ignition.

 (c)  
You must make sure you use anhydrous ammonia. Anhydrous ammonia does not contain water.

 NOTE: Liquid anhydrous ammonia is available only in sealed
____
 cylinders.

 1)  Sodium metal will have a dangerous reaction with water or a water solution (such as aqueous ammonia NH4OH solution).
 (d)  
Anhydrous ammonia gas is very poisonous. Do not breathe anhydrous ammonia gas. Injury to your nose, throat and lungs can occur. Also, do not let anhydrous ammonia gas touch your skin or your eyes. Bad burns can occur. A mixture of 15 to 28% (by volume) of ammonia can explode.

 (e)  
Do not swallow the liquid ammonia. Bad burns to your skin can occur.

 (f)  
Supply protective clothing and equipment as follows. 1) Chemical goggles or face shields. 2) Coated chemical resistant gloves. 3) Cotton clothes. 4) Full face, airline respirator with a self-contained air or

 oxygen breathing unit or canister mask.
 B.  Standard Tools and Equipment
 (1)  
Heat Lamps - 250 Watts

 (2)  
Thermocouples

 (3)  
Rex Model A Durometer

 (4)  
Shore A Durometer

 (5)  
Chemical Goggles

 (6)  
Face Shield

 (7)  
Coated Chemical Resistant Gloves

 (8)  
Cotton Clothes

 (9)  
Full Face Airline Respirator

 (10)
 Self-Contained Air or Oxygen Breathing Unit

 (11)
 Canister Mask

 C.  Consumable Materials
 (1)  
B00062 Acetone - Technical, 0-A-51

 (2)  
B00148 Solvent - Methyl Ethyl Ketone (MEK),
 TT-M-261

 

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 (3)  
B00080 Solvent - Butyl Alcohol, TT-B-846

 (4)  
B00066 Anhydrous Ammonia - 0-A-445

 (5)  
G00000 Sodium Metal - Technical, MIL-S-10391

 (6)  
A00134 Adhesive - BMS 14

 (7)  
G00000 Tape - Masking, Permacel 733

 (8)  
G00000 Etchant - Fluorobond TFE

 (9)  
G00000 Etchant - Tetra-Etch TFE

 (10)
 A00247 Adhesive - BMS 5-95, Class B-1/2

 (11)
 A00247 Adhesive - BMS 5-95, Class B-2

 (12)
　
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