A-A-52492A
TABLE I. Bulb and tail dimensions.
|
Type |
Nominal bulb diameter (mm) |
Tolerance on overall width (bulb plus tail) dimension specified in AED (mm) |
|
I |
9.5 + 1.6 |
± 1.6 |
|
I |
12.5 + 1.6 |
± 1.6 |
|
I |
16.0 + 1.6 |
± 1.6 |
|
I |
25.4 + 3.2 |
± 2.4 |
|
I |
38.1 + 3.2 |
± 3.2 |
|
I |
44.5 + 3.2 |
± 3.2 |
|
|
Nominal rectangular bulb size (mm) |
|
|
II |
19.1 + 1.6 by 38.1 +3.2 |
+3.2 |
3.3 Flame penetration. With the bulb of the finished seal compressed to 80% of its original nominal size between flat steel plates, the seal shall withstand an 1100 degrees Celsius (°C) flame for 15 minutes with no penetration of flame beyond the sealing point and no flame remaining in the seal for more than 5 seconds after removal of the flame source.
3.4 Load compression. The seals shall be capable of being compressed under load and recovered within the load requirements and recovery limits specified in tables II and III at 24 °C and 177 °C, respectively. This shall be verified by applying to the type I seals the loads in an axial direction and for the type II seals by applying the loads parallel to the tail and with the tail held down.
3.5 Compression recovery at 24 °C. The seals shall recover to the percentage of the original bulb size after 15 minutes subsequent to being compressed for one minute.
3.6 Compression recovery at 177 °C. The seals shall recover to the percentage of the original bulb size following each phase when subjected to the test as described below. The seals shall be compressed at the applicable percentage of compression specified in table III, for 16 ±1/2 hours (phase 1) and for 5 hours (phase 2). The seals shall be allowed to cool for 15 minutes at ambient temperature following each phase. Following 60 ±5 minutes rest, phase 1 and phase 2 shall be repeated for a total of 4 cycles.
3.7 Tear strength. The cover shall exhibit a minimum tear strength of 48.9 N before heat test, when tested in accordance with the requirements of ASTM D2261.
3.8 Ozone Depleting Substances. Avoid using all EPA Class 1 Ozone depleting substances.
3.9 Identification markings. Unless otherwise specified in the AED, identification markings shall be permanent and legible and shall include, as a minimum, the manufacturer’s CAGE code and part number and the AED part number (see 7.2).
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