First Defense® 1.3% MK-3 Stream OC Aerosol

MODEL: 43345 SKU: 1012574 PART: 43345

The MK-3 is an ideal size for patrol officers to wear on a duty belt and will deliver 10-12 short bursts of OC at an effective range of 10-12 ft. This 1.3% MC OC aerosol product utilizes a stream delivery method providing a target-specific, strong concentrated stream for greater standoff.  

Non-flammable / Electronic Discharge Weapon (EDW) safe



First Defense® 1.3% MK-3 Stream OC Aerosol,

The MK-3 is an ideal size for patrol officers to wear on a duty belt and will deliver 10-12 short bursts of OC at an effective range of 10-12 ft. This 1.3% MC OC aerosol product utilizes a stream delivery method providing a target-specific, strong concentrated stream for greater standoff.  

Non-flammable / Electronic Discharge Weapon (EDW) safe


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Additional Information

  • The 1.47 oz. MK-3 canister will deliver 10-12 short bursts of OC at an effective range of 10-12 ft. 
  • The stream delivery method provides a target-specific, strong concentrated stream for greater standoff.
  • The 1.3% MC red banded canister indicates the major capsaicinoid level which is discharged at the nozzle at time of use. 
  • The MK-3 is an ideal size for patrol officers to wear on a duty belt.
  • This formulation has been tested and is non-flammable and Electronic Discharge Weapon (EDW) safe.
  • Defense Technology® First Defense® OC Aerosols are produced in an ISO rated manufacturing facility.
  • All Major Capsaicinoid percentages (MC%) are verified by an Independent Laboratory for quality assurance.



  1. Remove affected person from the contaminated area to an open space, facing the wind.
  2. Keep subject calm and restrict activity.
  3. Most subjects will be well on their way to total recovery 45 minutes after first aid begins.

II. EYES: Intense burning sensation, temporary inflammation of the tissues around the eyes, causing involuntary closure.

  1. Wash eyes out with large amounts of cool water.
  2. DO NOT allow the subject to rub their eyes or face. If the need arises to use a paper towel, use a blotting motion and discard after one use.
  3. Find out if subject is wearing contact lenses. If so, allow them to remove the lenses or call EMS to remove them. DO NOT attempt to remove unless medically trained to do so. Contacts may become contaminated and may need to be discarded.
  4. Keep eyes open facing wind.
  5. Tearing helps clear the eyes.
  6. Keep exposed subjects out of direct sun light during the decontamination process. The brighter and hotter the direct sunlight is, the more it enhances the burning sensation.

III. NOSE: Irritation, burning sensation, nasal discharge.

  1. Breathe normally.
  2. Blow nose to discharge any material.

IV. SKIN: Burning sensation on affected skin areas. Redness may occur on fair skinned individuals.

  1. DO NOT apply creams, salves, oils, lotions or burn cream as they will only trap the OC on the skin.
  2. Flush the skin with large amounts of cool water and expose the subject to fresh air.
  3. Further relief may be gained by showering with cool water using mild soap and shampooing hair. Wash thoroughly, rinsing often to manage any contaminated water on your body.

Contact Defense Technology® with any questions regarding these procedures  


STEP 1: Ventilate the building to remove airborne OC. Open all doors and windows that weather permits. This should be accomplished as soon as possible. If fans can be placed to increase ventilation, this will help.

STEP 2: Surfaces can be decontaminated by washing with water or a damp cloth. Wet clean where possible, using commercially available detergents like Dawn or Simple Green.

STEP 3: Clothing and other fabrics can be cleaned in their usual manner (either by machine washing or dry cleaning).

NOTE: Rubber gloves and a gauze face mask should be used by personnel during the clean-up stage to prevent the possibility of residual contamination. OC is a better indoor deployment option than CN or CS, as positive clean up and re-occupation of the structure can usually take place within one to two hours. Minimal clean-up costs need be imposed on the deploying agency.



Poor storage conditions will significantly reduce the shelf life of these products resulting in the replacement of the canisters sooner than necessary or the possible use of defective products. Humidity and heat are the two most damaging factors that destroy OC canisters.

  • The canisters and grenades should be stored in a controlled atmosphere with temperatures between 60 degrees Fahrenheit to 75 degrees Fahrenheit with less than 60% relative humidity.
  • Canisters should remain sealed in their shipping containers until they are to be used or placed in a duty belt/holster.
  • Never store canisters in the trunk of a car for prolonged periods. The heat may cause the canisters to build pressure and eventually release propellant and possibly agent or OC.

Stored munitions should be inspected for physical integrity and a representative sample functioned twice a year. Munitions that have surpassed the warranty of 5 YEARS should be replaced.


The following information is intended only to provide general information for our customers. It is extremely important that anyone using our products comply with all applicable environmental laws and regulations. We recommend that you consult with appropriate legal counsel or governmental authorities prior to disposing of any of our chemical products.

In 1976, Congress enacted a law entitled, The Resource Conservations and Recovery Act of 1976 (RCRA). This law was intended to protect human health and the environment from imprudent disposal of “hazardous wastes.”

Outdated or otherwise unusable pyrotechnic items are considered “hazardous waste” under RCRA and are assigned the EPA hazardous waste code of D00 1 due to their ignitable characteristic. Disposal of these items must be done in accordance with all applicable Federal and/or State laws. Many states have hazardous waste management programs that are much more stringent than Federal law. For this reason, you should check with the EPA Regional Office to determine to what extent these laws apply to you.


What is the difference between SHUs and MC%?

  • Defense Technology® no longer recognizes Scoville Heat Units (SHUs) as a viable means to measure pungency in regards to pepper spray.
  • Scoville Heat Units are a subjective measurement system dating back to the American Spice Trade. For years SHUs have been used as a measuring system within the pepper spray industry, resulting in confusion and a lack of confidence and consistency regarding the pungency and percentage of OC formulations.
  • High Performance Liquid Chromatography or HPLC, is the only true way to measure the heat of a formulation. It is a scientific method and ensures consistency. This is the standard used by Defense Technology®. The finished Defense Technology® OC formulations are tested at an independent laboratory tested for the exact percentage of major capsaicinoids (MC%).
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First Defense® 1.3% MK-3 Stream OC Aerosol is rated 5.0 out of 5 by 3.
Rated 5 out of 5 by from Best OC on the market! I carried two cans of this working several off duty security details. One incident I had to deploy mine and it actually malfunctioned. Now, in safarilands defense the can was expired but, they still did not hesitate in taking my misfortune very serious. They not only replaced the can but,also put me in contact with their LE sales rep. who went above and beyond in taking care of me and staying in touch. Forgive me as it's been a couple years and I cannot remember his name. The help I received from Safariland is proof why they are the best.
Date published: 2016-01-12
Rated 5 out of 5 by from The Real Deal (in the wrong-size can) I'd say that effective police work has fallen on hard times, but nothing is new under the sun. CS sprays were originally hot stuff until they were litigiously watered down, creating an opening for OC. OC was really hot stuff, but it too, unfortunately, has been watered down. NOT SO WITH THIS! For those of you who do unto others as you would have them do unto you, this is the fight-stopping pepper spray you've been looking for. The first time I tested this was outside on a very windy October day. Despite the gusts, the canister made a pristine, well-defined cone out to ten feet. Like an idiot, I left the area and came back 90 seconds later, only to have my eyes start watering. If the residue in a wind-tunnel can do this, you know you've got a winner! The only shortcoming of this product is its size, especially for civilians. If you're throwing a can of this in your purse, go with the full-sized Mk-4; you'll find it easier at the moment of truth and have more fun to go around. If you're putting this in your pocket, the Mk-2, 3, & 4 are all too thick; go with the excellent Mk-6. Especially for civilians, stick to a cone or fog can: these things are so highly pressured you'll make your mark without having to aim precisely under stress.
Date published: 2014-11-18
Rated 5 out of 5 by from WOW! Potent Stuff We use the 1.3% stream in the field, but have to take a hit during training before use. This is a highly effective, less than lethal option, that completely disabled every one of us that were in training. There is no way we could have worked through a direct hit like that. I have been sprayed four times in the past, but it wasn't as strong as this product. I would highly recommend this product as an alternative
Date published: 2014-11-14
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