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What Does It Mean When a Sealant is Qualified and Approved by MIL-I-17563C?

Posted by Han Sim on Mon, Mar 24, 2014 @ 11:17 AM

MIL-I-17563C is the Military Specification for cast or powder metal components. This specification is approved for use by all Departments and Agencies of the Department of Defense and “covers the requirements for impregnants suitable for use in sealing the voids found in cast or powder metal components which cause leaking of contained fluids.

 

compare_sealant.jpg

 

To answer the question above, it’s important to first understand the 3 classifications within MIL-I-17563C.

 

Class 1 - Suitable for service temperatures up to 300°F (149°C)

Class 1a - Suitable for use on mortar shell castings up to 300°F (149°C)

Class 2 - Suitable for service temperatures up to 500°F (260°C)

Class 3 - Suitable for use where air pollution requirements apply and compatible with acrylic-nitrocellulose lacquer paint system up to 300°F (149°C)

 

In general, all organic based vacuum impregnation sealants are qualified to Class 1 and 3. Class 2 was designed specifically for sodium silicate which is in very limited use today, and Class 1a qualifies the sealant to be compatible with TNT (Trinitrotoluene) and Composition B explosives.

To qualify for MIL-I-17563C, the sealant is subjected to various tests including pot and storage life stability. Once activated, the sealant must be stable at 75 +/- 5°F (24 +/- 2.8°C) for one month for thermal cure and 45 +/- 5°F (8 +/- 2.8°C) for anaerobic while under aeration. Un-activated or un-catalyzed material in an unopened container must meet the manufacturer’s original specification at the end of one year from date of manufacture. All Godfrey & Wing sealants are approved for two (2) years.

 

The sealant reactivity to various metals including aluminum, copper, iron, magnesium and zinc is also tested. Samples must not exhibit any obvious surface defect such as holes, pits and fissures. Samples with copper shall not show a greenish coloration after exposure for 24 hours.

 

Godfrey & Wing currently has five sealants approved on QPL-17563 and are listed below:

 

95-1000 - Thermal curing

95-1000A - Thermal curing          

95-1000AA - Thermal curing

95-1000AC - Anaerobic

95-1000ACP - Anaerobic

 

Conditioning testing under various test media, time and temperature are shown in Table 1.

 

TABLE 1 – Conditioning Tests

Impregnation
Class
Material Media
Specifications
 Time Temperature 
 1 and 3  Carbon Removal  P-C-111  30 minutes  73.4 +/- 3.6 °F (23 +/- 2 °C)
   18% Sulfuric Acid  O-S-809  2 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Turbine Fuel  MIL-T-5624  48 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Fuel  ASTM D-910  48 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Diester Grease  MIL-G-23827  48 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Stoddard Solvent  P-D-680  48 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Ethyl Alcohol  MIL-E-463  48 hours  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Hydrocarbon Fluid  TT-S-735  14 days  73.4 +/- 3.6 °F (23 +/- 2 °C)
   Water  N/A  14 days  212 °F (100 °C)
   Oil  MIL-H-17672  14 days  210 +/- 5 °F (99 +/- 2.8 °C)
   Hydraulic Fluid  MIL-F-17111  14 days  210 +/- 5 °F (99 +/- 2.8 °C)
   Lubricating Oil  MIL-L-7808  48 hours  255 +/- 5 °F (121 +/- 2.8 °C)
   Ethylene Glycol  MIL-E-9500  14 days  300 +/- 5 °F (149 +/- 2.8 °C)
   Ethylene Glycol  MIL-E-9500  14 days  397 +/- 5 °F (197 +/- 2.8 °C)
   Thermal Resistance  N/A  14 days  300 +/- 5 °F (149 +/- 2.8 °C)

 


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Topics: Military Specification, MIL-I-17563C, Vacuum Impregnation Sealants

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