The original, patented, fully tested OC formulation. Over many years of safe, effective use, First Defense has proven itself as the pepper spray of choice for law-enforcement and corrections the world over.

Larger size aerosols like the MK-21 produce high-volume streams for an extended range of crowd-management options.
FIRST DEFENSE® OC Formulation was created to provide the safest OC aerosol on the market. Today it's the most widely used pepper spray in law enforcement and corrections throughout the world. Three out of four police departments choose First Defense® OC Aerosols by Defense Technology—not only for their proven effectiveness, but because they are the only such products backed by a comprehensive effectiveness study, and the only products that address the ever-growing concerns over health and environmental risks.

First Defense® Oleoresin Capsicum is water-soluble. It is processed further than oil-based OC to remove natural oils, waxes and fats; yielding a formulation that is clear of color and consistent in its potency. At 500,000 SHU, it’s also the hottest, water-soluble OC available. Based on their extensive research, Defense Technology has determined that their 0.2% capsaicinoid level is optimum for consistent effectiveness. But because First Defense’s water-soluble OC formula decontaminates more easily then oil-based solutions, it's not so excessive that decontamination time or simplicity is compromised.

High volume, long-range stream delivery. The First Defense MK-21 aerosol can deploy 10 to 12 one-second bursts of a target-specific, high-volume stream up to 30 feet, for extended range crowd management options. This provides a safer margin of effective distance with less chance of disturbance by wind or rain compared to alternate delivery systems.

Optional Hose and Wand insertion tube attachment provides alternate delivery options. This versatile attachment is designed to allow discrete deployment under doors, through windows or into other tight openings. It increases the utility of high-volume “Extinguisher” aerosols, especially in detainment facilities and correctional institutions.

Non-flammable, environmentally friendly, simple to clean. First Defense OC Aerosols use only food-grade formulations and safe nitrogen propellant, making them completely non-flammable and biologically sound. They contain no HCFCs or CFCs. And because First Defense is water-soluble, it allows relatively easy clean-up and decontamination of skin and surfaces, using soap and water or just a damp cloth. Clothing and fabrics can be cleaned by machine washing or dry cleaning. Airborne OC can be cleared from buildings with simple ventilation.

COOL IT! For faster relief. Convenient COOL IT! aerosols and towelettes contain a quick-acting herbal ingredient designed to draw the oily resin of OC out of the skin.

Tested and proven—in the streets, in the lab, and in the courtroom. Defense Technology has never lost or settled a legal claim against them. Ever.

CARRIER (Ingredients): d-Limonene, Secondary Butanol, and Oil-Based OC.

First Defense is available in MK-3, MK-4, MK-6, MK-8, MK-9, MK-21, MK-46V, and MK-46H aerosol projectors.

TECHNICAL RESOURCES AND PRODUCT INFORMATION DOWNLOADS:

Material Safety Data Sheet:
May be used to comply with OSHA's Hazard Communication Standard, 29CFR 1910. 1200. Standard must be consulted for specific requirements.

5721 - MK21 First Defense HV Stream

MK-21 Applicator Specification Manual

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OC Aerosols & Projectors: Technical Reports and Analysis

Aerosol Projector Usage Guidelines
(Usage Instructions, Effects, Decontamination, First Aid)
Tech Bulletin: Aerosol Flammability & Electrical Discharge Weapons
Health Risk Analysis
OC and Pepper Sprays — Determining “Hotness”
Aerodynamic Particle Size Analysis (Re: Safety of First Defense Pepper Sprays)

MK-21 PROJECTOR SPECIFICATIONS
(Subject to change without notice. All specifications are averages.)

RELIABLE, REFILLABLE CANISTER: The durable, seamless aluminum canister holding the formulation is fitted with a discharge mechanism consisting of a spring-loaded depression valve, aluminum detachable nozzle, pressure gauge, Schrader valve, and squeeze-type actuator. The MK-21 projector is easily refillable from a First Defense 5521 Refill, and re-chargeable with the addition of the Schrader valve.

SAFE AND EASY TO USE: A steel "pull-ring" type safety pin passes through both the discharge mechanism and the actuator to prevent accidental discharge.

INDIVIDUALLY SERIALIZED: Wear and water-resistant labels affixed to all units permit easy identification. Lot numbers for formulation are present for quality assurance tracking.