PL75-9 datasheet(4/141 Pages) ETC

4 / 141 page

Trompeter Products Catalog - T21 Military/Aerospace

ISO 9001

Registered

(800) 982-2629

Fax: (818) 706-1040

www.trompeter.com

Trompeter has a long and proud history of servicing space applications. NASA uses the specification (SP-R-0022),

Vacuum Stability Requirements of Polymeric Material for Space Application, to qualify materials for use in spacecraft.

This has also become the standard in the commercial space industry. This specification governs the "outgassing" of non-

metallic materials. Outgassing occurs when a non-metallic material is placed into a vacuum, subjected to heat, and some

of its constituents are volatilized.

One of the bi-products of outgassing is that the material loses a portion of its mass. This is referred to as Total Mass Loss,

or TML. Under the NASA specification, the material's TML should not exceed 1.0% of the total specimen mass. This

issue is very important because shrinkage may contribute to the failure of a connector as the connector components will

no longer fit properly.

Another bi-product of outgassing is Collectable Volatile Condensable Material (CVCM). This represents the quantity

of outgassed matter that condenses and collects on a surface. Under the NASA specification, the maximum condensable

material allowed is 0.1% of the total specimen mass. This is very critical in a thermal/vacuum environment because it

is the condensed material that will contaminate optical and sensory surfaces causing them to possibly fail.

Some polymeric materials meet the requirements of a TML less than 1.0% and CVCM of less than 0.1% through the

normal manufacturing process. Other polymeric materials, while not within limits after their manufacture, can be

brought within vacuum stability limits by vacuum baking for a specific period of time (usually 48 hours at maximum

use temperature at a pressure less than 10-5 torr). If a material cannot be vacuum baked, its exposure area is 13cm2 or less,

and is out of sight of a payload or other critical surfaces, then a TML not greater than 3.0% and a CVCM not greater than

1.0% is acceptable.

Test conditions are ASTM E-595 or ASTM F-1227. The test consists of heating a sample to 125

°C for 24 hours under

a 10-5 torr vacuum and measuring the weight loss and any material that condenses on an adjacent cold surface area (25

°C).

The most common candidates for outgassing in Trompeter product lines include:

1. Silicon rubber per ZZ-R-765E/GEN (Federal Spec), Class 2B, Grade 40, 50, 60, and 70. Almost all of

Trompeter's gaskets are manufactured from this material. These materials require a post process

(by Trompeter) at 200

°centigrade for 6 hours minimum.

2. Ink. Trompeter uses MarkemTM series 7224 inks (in a variety of colors) for part marking. Only blue 7224

Markem ink has acceptable TML (0.43%) and CVCM (0.07%) readings after a post cure process. While this

is acceptable, Trompeter recommends impression stamping the connector rather than ink marking.

3. Shrinkable strain relief/sealing sleeve. Sleeves made from KynarTM material meets the requirement for

outgassing at 0.14% TML and 0.02% CVCM.

4. Insulators. At Trompeter, the majority of dielectric insulators are made from PTFE. (TeflonTM is Dupont's

trademark for PTFE, FEP, and PFA fluoropolymer resins). PTFE has excellent TML (0.07%) and CVCM

(0.01%) readings. The loss rate is about one-tenth of the acceptable maximum rates for spacecraft uses.

Space-qualified connectors

Outgassing Requirements

for Space Rated Connectors

For a list of connectors which meet outgassing requirements, contact our technical support staff.

PL75-9 датащи(PDF) 4 Page - List of Unclassifed Manufacturers

PL75-9 датащи(HTML) 4 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL