Oblique impact tests were performed on RX-04-DS and on the extrusion cast explosive RX-08-AZ. Partial reactions were observed on RX-04-DS at 5.0(prime), 45° and at 1.25(prime), 14°; no reactions were observed with RX-08-AZ in the severest of tests. Vertical drop tests were performed on 6 inch-diameter hemispheres of LX-04-1. Results are tabulated. A series of accelerometer instrumented oblique impact tests were performed to obtain normal and rotational acceleration versus time. Half-inch gap test series were performed on RX-08-AZ. No experimental work with the friction test apparatus was done this period.

Vertical drop tests were completed on several explosives. Results are given and discussed. Oblique impact tests were performed on the extrusion cast explosive RX-08-AZ. No reactions were observed in the severest of impacts. Half-inch gap test series were performed on two lots of LX-09-0. Results are tabulated. No experimental work with the friction test apparatus was done this period.

Oblique impact tests were performed on both artificially aged and unaged LX-09-0. Oblique impact, instrumented vertical drops, and friction tests were performed on RX-25-AA. An extensive oblique impact and instrumented vertical drop test series was performed using three compositional variations of LX-10-0.

Additional oblique impact tests were performed on RX-25-AA in an attempt to determine its initiation threshold. Several more oblique impact tests were conducted on the LX-10-0 variants. Experimental results from some of the tests conducted last period on the LX-10-0 variant are presented (accelerator records had not been analyzed at the close of the last reporting period). An instrumented vertical drop and oblique impact test series was begun on LX-10-0 Lot 710-2. No experimental work was performed using the HE friction sensitivity apparatus.

The oblique impact test series on LX-10-0 Lot 710-2 was completed. Two instrumented oblique impact tests were done using RX-04-DW dropped at 45°, 5(prime) on a smooth steel surface. One additional oblique impact using RX-04-EB at 45° 3.5(prime) was done. An instrumented vertical drop and oblique impact series was begun on RX-04-EC (96/4 HMX/Viton).

The oblique impact sensitivity of UK-UK-simulated HMX in 85 to 90% formulation with Viton is not enough lower, if any, to encourage richer formulations or change to Bridgewater processes for this reason alone. Fifty-pound cyclotol 75/25 hemispheres gave moderate reactions (No. 4) as low as 3.5 foot (14°); lower tests have not been performed yet. {open_quotes}Reduced-H.E.{close_quotes} pieces of PBX 9404, 2, 3, 4, and 5 inches thick, respectively, were tested at 1.75 foot (14°) resulting in a 6 reaction for the 5 inches thick piece while the remaining three pieces gave 0 reactions.

RX-04-CW, LX-07-1, and RX-09-CD were tested. The RX-04-CW and LX-07-1 are not complete; however, results so far show the TX-04-CW comparable in sensitivity to PBX 9404 while the LX-07-1 is less sensitive at 14°. The RX-09-CD was slightly more sensitive than the RX-09-CB previously tested.