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A – Acceptable stabilizer loss. Lot is safe for storage until next required retest date.<br />

B – Significant stabilizer loss. Lot does not represent an immediate hazard, but it is approaching a<br />

potentially hazardous stability condition. This level of stabilizer loss does not adversely affect functioning<br />

in a finished round configuration.<br />

C – Unacceptable stabilizer loss. The lot presents a potential safety hazard and is an unacceptable<br />

risk for continued storage as bulk propellant, bulk-packed components, or as separate loading propelling<br />

charges. The risk of autoignition of propellant in stability category D increases with time. Demilitarization<br />

must be completed within 60 days of notification for bulk propellant, bulk-packed components, and<br />

separate loading propelling charges.<br />

propellants can be analyzed at a comfortable rate of 10<br />

to 12 lots per hour.<br />

In September 2002, the Joint Propellant Safety<br />

Surveillance Board (PSSB) validated the APE 1995<br />

NIR Propellant Stability Analyzer as a screening<br />

tool for determining the general stability of solid<br />

propellants. The PSSB is the joint services technical<br />

advisory board of the Joint Ordnance Commanders<br />

Group quality assurance subgroup for policies and<br />

procedures pertaining to gun propellant stability.<br />

Since the PSSB endorsement, the APE 1995 units<br />

have been fielded to Arifjan, Kuwait, and to Tooele<br />

Army Depot, Utah, for use in demilitarization operations,<br />

and a unit has been sold to the Saudi Arabian<br />

National Guard. Indiana Ordnance Works, Inc., is<br />

also operating an APE 1995 in conjunction with an<br />

Army propellant recycling contract. APE 1995 units<br />

are slated for issue to Hawthorne Army Depot in<br />

Nevada, Crane Army Ammunition Activity in Indiana,<br />

and Anniston Munitions Center in Alabama.<br />

At least a dozen different models of artillery and<br />

small arms propellant, including the most-used types,<br />

such as M1, M6, M8, M9, and WC-series, are currently<br />

within the APE 1995’s test capability. Work<br />

continues to expand the types and models of propellants<br />

that APE 1995 is capable of testing.<br />

TLC Propellant Stability Test Kit<br />

Eight years of research and development by the<br />

Lawrence Livermore National Laboratory’s Forensic<br />

Science Center led to the TLC propellant stability test<br />

kit, a field-portable set that gives trained quality assurance<br />

specialists (ammunition surveillance) (QASASs)<br />

and others the ability to produce lab-quality results in<br />

an onsite, real-time mode. A miniaturized wet laboratory<br />

with single-person portability, the kit is powered by<br />

either a redundantly designed, dually capable 110-volt<br />

24<br />

Stability Category Percent Effective Stabilizer<br />

A 0.30 or more<br />

B 0.29 – 0.20<br />

C less than 0.20<br />

Table 13–2 from Supply Bulletin 742–1, Ammunition Surveillance Procedures<br />

wall current or self-contained, rechargeable batteries.<br />

The TLC test kit can be used almost anywhere to test for<br />

safe levels of RES in solid propellants that are stabilized<br />

with diphenlyamine, 2-nitrodiphenylamine, ethyl centralite,<br />

or Akardite II. The ability to analyze all four of<br />

the most-used stabilizers makes it possible to test almost<br />

all of the propellant powders in the DOD inventory.<br />

The TLC method provides a go/no-go response<br />

within a critical range of RES levels; propellants with<br />

results that fall below the predetermined cutoff level<br />

are either demilitarized or subjected to a full chemical<br />

analysis by HPLC. The TLC method was developed for<br />

the Army to be used as a screening tool to determine<br />

the amount of stabilizer contained in solid propellant<br />

that is not in the active stockpile (third party assets or<br />

demilitarization assets). When directed by the JMCmanaged<br />

Propellant Stability Program, both the NIR<br />

and TLC methods may also be used to test propellants<br />

in the active stockpile.<br />

Conventional TLC analysis is routinely used in analytical<br />

laboratories worldwide for qualitative and semiquantitative<br />

characterization of unknown materials.<br />

Although TLC is ideal for rapid screening, is highly<br />

sensitive, and readily identifies the analytes sought in<br />

the complex propellant stabilizer samples, it has previously<br />

been considered a technique appropriate for use<br />

only in the laboratory, never for the field environment.<br />

Unlike column chromatography approaches, such<br />

as HPLC or gas chromatography-mass spectrometry,<br />

that can only process single samples sequentially, a<br />

single TLC plate can accommodate and analyze multiple<br />

samples and standards. Samples are chromatographed<br />

simultaneously in a solvent tank, separating the stabilizer<br />

analytes from the sample matrix. Semi-quantitative<br />

assessments with nanogram detection limits are readily<br />

obtained by inspection of the plates. The kit is designed<br />

and equipped with sufficient supplies and equipment for<br />

JULY–AUGUST 2008

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