Expray Kits

Expray kits are portable assemblies of chemical reagents and sampling materials enabling rapid field identification of explosive residues or compounds at crime scenes, security checkpoints, or suspicious material locations. The kit approach provides mobile screening capability enabling preliminary threat assessment without requiring laboratory infrastructure or electronic instrumentation.

Premium Expray kits typically include multiple colour-change test reagents targeting diverse explosive types. Chemical tests employ colour-change reactions identifying specific explosive compounds (TNT, RDX, PETN, C-4, SEMTEX, dynamite, nitroglycerin). Test strips enable rapid visual assessment within 30–60 seconds without requiring instruments. Sampling swabs collect residual explosive particles from surfaces, clothing, vehicles, or containers. Instruction cards guide operators through procedures enabling minimally-trained personnel reliable results.

Test methodologies span colorimetric reactions producing distinct colour changes indicating explosive presence, precipitation reactions forming observable crystals confirming specific compounds, and redox reactions generating characteristic colour transitions. Each methodology addresses specific explosive types and sensitivity requirements.

Operational procedures involve swabbing suspect surface or material, inserting swab into test reagent, observing colour change within specified timeframe (typically 30–120 seconds), and comparing results against reference colour charts. Positive results trigger enforcement activation and confirmatory laboratory testing.

Limitations include false positive results from legitimate compounds requiring confirmatory testing, sensitivity variation across explosive types, and reagent shelf-life requiring periodic replacement. Training emphasises proper procedure following preventing invalid results.

Environmental operation across 0–50°C temperature ranges supports deployment across diverse settings.

In Pakistan, Expray kits support law enforcement and security screening operations.

Tactical Supply Pakistan supplies Expray kits for field explosive detection and threat assessment applications.