MIL-PRF-87896A
TABLE II. Sampling for tests.
Number of containers in lot
Number of containers to be sampled
1
1
2 - 40
2
41 - 70
3
70 and over
4
4.3 Sampling plan.
4.3.1 Lot. A lot shall consist of one of the following:
a. The propellant produced in not more than 24 consecutive hours from a continuous process
which is used to fill shipping containers directly from the process output. A continuous process shall be
the production of product by continuous input of raw materials and output of finished product by one
manufacturer in one plant with no change in manufacturing conditions or materials
b. The propellant from individual runs of a batch process which is used to fill shipping containers
directly from the process output. A batch process shall be the production of product by runs from single
additions of raw materials which are reacted and purified forming the product.
c. The propellant from either or both the continuous and batch processes which is held in a
single storage tank and subsequently withdrawn to fill shipping containers. The product shall be
homogenous at the time of withdrawal and shall not be added to while being withdrawn. After each
addition to the storage tank, the contents shall constitute a separate lot.
4.3.1.1 Sample size. Each sample shall be of sufficient size to conduct all the quality
conformance tests as specified herein.
4.3.1.2 Sampling method. Unless otherwise specified, the propellant shall be sampled IAW
ASTM F307. All apparatus used shall be made of suitable materials. Each sample obtained shall be
representative of the propellant as a whole.
4.4 Rejection. When any sample of the propellant tested in accordance with 4.5 fails to conform
to the requirements specified herein, the entire lot represented by the sample shall be rejected.
4.5 Test methods. The contractor's own test methods may be used if approved by the procuring
activity. In case of a dispute, the following shall be the referee methods.
4.5.1 Purity. Calculate the nitrogen trifluoride (NF3) purity as follows:
NF3 %Vol = 100 - Σ%i
where,
Σ%i
=
The sum of the impurities found in 4.5.2 through 4.5.5.
4
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