Reduced Sensitivity RDX US and International Efforts Presented by: Lori A. Nock NSWC Indian Head Division 39 th Annual Gun & Ammunition/Missiles & Rockets.

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Presentation transcript:

Reduced Sensitivity RDX US and International Efforts Presented by: Lori A. Nock NSWC Indian Head Division 39 th Annual Gun & Ammunition/Missiles & Rockets Conference & Exhibition April 2004 DoD POC: Dr. Ruth Doherty NSWC Indian Head Division

Reduced Sensitivity RDX Background In the late 1990s SNPE (SME now Eurenco) marketed an “insensitive” form of RDX (IRDX®) –Woolwich synthesis –Employed proprietary recrystallization process –Produced RDX that displayed reduced sensitivity to shock initiation as measured by Large Scale Gap Test In 2001 Army pursued an FCT program to evaluate IRDX® in 155 mm projectile with the goal to: –determine whether IRDX® would improve the IM characteristics of the projectile –determine whether the SNPE crystallization process could be implemented at Holston (Bachmann synthesis) to produce reduced sensitivity RDX

Reduced Sensitivity RDX Results of FCT SNPE – recrystallized HSAAP RDX into IRDX® US Army, Navy and AF –evaluated 2 formulations using both IRDX® and HSAAP IRDX® Wax-based melt castable explosive (Air Force) Cast curable PBX explosive (Navy) –conducted performance and IM testing –Upon aging, the HSAAP RDX recrystallized by SNPE did not retain the original “insensitive” characteristics

Reduced Sensitivity RDX Post FCT Subsequently, other manufacturers claimed to produce forms of RDX that exhibit reduced sensitivity to shock relative to conventional RDX as produced by the Bachman process. In 2003, Army published a sources sought solicitation –Who makes it? –Analysis techniques (How do you know it’s “Reduced Sensitivity RDX”) The following manufacturers are now claiming to make Reduced Sensitivity RDX (RS-RDX): –EUROENCO (aka SNPE): IRDX® –Australian Defence Industries (ADI): Grade A RDX –Royal Ordnance Defence (RO): Type I RDX –Dyno Nobel: RS-RDX Of these, only Dyno employs the Bachman process.

Reduced Sensitivity RDX What makes RDX insensitive? No definitive explanation has been offered for the insensitivity of the RDX from these manufacturers. Crystal quality of some sort appears to be involved. No parameter that can be measured on the crystalline material has been identified that will enable one to distinguish between relatively more sensitive and relatively less sensitive forms.

Reduced Sensitivity RDX Current Efforts NIMIC Technical Meeting on RS-RDX held in Meppen, Germany in November 2003 –Plans to update STANAG 4022 to address RS-RDX – Projected distribution for ratification: May 2006 Supporting data for development of criteria for RS-RDX still needed –Round Robin testing of several kinds of RDX

Reduced Sensitivity RDX Structure of Round Robin Step 1: Identification of techniques likely to show a difference between RS-RDX and non-RS-RDX –Done at NIMIC meeting in Meppen Step 2: Definition of methods to be applied to analysis –Protocol will be documented and all participating laboratories will follow same method. –Volunteers currently working on documentation Step 3: Procurement of RDX samples Step 4: Distribution of blind samples to participating labs Step 5: Experimental study of various kinds of RDX –Analysis of samples according to experimental protocols at all participating labs –Shock sensitivity testing of PBXN-109 formulated with each of the types of RDX being tested Step 6: Comparison of results of analyses with shock sensitivity tests

Reduced Sensitivity RDX Round Robin Participating Laboratories* Australia – DSTO Canada – DRDC/Valcartier Germany –WIWEB –WTD 91 Italy - Mariperman Netherlands – TNO Prins Maurits Laboratory Switzerland - Armasuisse UK - QinetiQ US –AFRL/MNME –US Army TACOM ARDEC –US Army AMRDEC –NSWC/Indian Head Division –NAVAIR/Weapons Division *Contingent on availability of funding No response yet from: France (ISL)

Reduced Sensitivity RDX Round Robin Materials to be studied All samples will be commercially available material meeting US MIL- DTL-398D Class 1 granulation requirement

Reduced Sensitivity RDX Round Robin Analytical Methods for Neat RDX Impurities (HPLC, GC) –HMX –Minor byproducts of synthesis –Solvents or other volatile organic compounds Melting point Impact sensitivity Vacuum thermal stability Particle size distribution Average particle density Particle density distribution Examination by optical and scanning electron microscopy Nuclear Quadrupole Resonance STANAG REQUIREMENT

Test: LSGT or ELSGT Formulation: PBXN-109 –Widely used, so large amount of archival data –Much of the data on RS-RDX to date is in this formulation Aging will also be done to determine persistence of the effect –6 months –Shock sensitivity testing at 2, 4, 6 months Reduced Sensitivity RDX Round Robin Test Methods for Formulated RDX

Reduced Sensitivity RDX Round Robin Status 13 labs expressed interest in participating Analytical protocols being documented Source of US funding for RDX identified –Procurement actions ongoing –Possible delivery in 4 th Qtr FY04 Funding for characterization of most RDX samples at a Navy lab identified –Leveraging Navy Combat Safe Insensitive Munitions program.