Recently, the majority of comments that I replied were all issues regarding about breaking hard rocks and concretes. So to all fellow treasure hunters in the Philippines, I would like to introduce a commercial product known as Dexpan Concrete Demolition Agent.Before we proceed on discussing more about Dexpan, let us have a brief discussion about how the JIA (Japanese Imperial Army) built those incredibly tough concretes.

The JIA actually used some kind of secret chemical formula that they often mixed into the cement. Based on my experiences as a TH (treasure hunter), I noticed that their concrete are composed of pure cement. They do not use sands as an added mixture. Although, they sometimes mix pebbles or broken pieces of clam shells on some of their concretes.

Using manual tools such as chisel and large hammer will not work against the hard concrete. Even the use of ordinary explosives will most likely result into failures.

Some THs refers to these extremely hard concrete as the “Japanese Bunker Grade II Cement”. It was a special cement that the JIA used in building their bunkers as shelters against their enemies attacking either from above or on the ground. Thus, the concrete can withstand powerful impacts of explosions.

Basic Instruction on How to Use Dexpan

Following the instruction on how to use Dexpan to break rocks and concretes is “very important”. Doing it incorrectly can lead to failure. So I suggest to “read the manual” and “perform some actual tests” before attempting to use it on the main object you intended to break.

Here are the following basic instruction on how to use Dexpan:

1. Three Easy Steps of Preparation

a. Drill the Holes

Use “Hammer Drill” for drilling the holes into the reinforced concrete. Recommended distances of the holes from one another must be at least 8 inches or 20 cm apart. As for the diameter, it must be at least 1.5 inches or 3.8 cm.


– Do not use ordinary type of drill bits because they will not last long enough. Diamond or tungsten (tip) drill bits is best recommended for drilling the holes.

– When drilling holes, it is important “not to over-heat” the drill bit. Take a break for every 5 to 10 minutes of drilling to allow the drill bit from cooling. Submerging the drill bit into a water also helps in cooling it down.

b. Mixing Dexan with Water

Using a flat bottom bucket, mix the required amount of water and bag of Dexpan. It is important to mix it well until the Dexpan is completely dissolved by the water. After thoroughly mixed, leave it for 10 to 15 minutes before pouring it into the holes.

c. Pouring the Mixture into the Holes

Before pouring the Dexpan mixture into the holes, you need to clean them first. You can use an air hose to get rid of the dusts and other particles inside.

When pouring the Dexpan mixture into the holes, make sure that “no air” gets trap inside but in most cases this can never be avoided. So if this happens, use a stick to poke into the hole several times allowing the air to escape out.

If filling a hole in vertical position, it is important to leave at least ½ to 1 inch of unfilled allowance. But for holes with horizontal positions, you will need a cap to prevent the Dexpan mixture from leaking out. The same thing applies for holes with inclined positions.

2. Dexpan will Crack the Object

Dexpan works by cracking the object according to the pattern that you drilled.

3. The Waiting Period – There will be No Noise or Vibration in the Breaking Process of the Object

The breaking process of the object will “not occur in an instant”. You need to wait at least 2 to 8 hours right after filling all the holes with the Dexpan mixtures. However, the waiting period can be much longer due to several factors involve such as the ambient temperature, humidity and hardness of the object. So for best results, it is recommended to wait at least 24 hours.

Can Dexpan Break Concretes made from Japanese Grade II Bunker Cements?

The answer is “Yes”. Me and my THing (treasure hunting) crew already used Dexpan several times with great amazing results. It is even “less hassle” and it is completely “safe”.

Unfortunately, the main issue here is the “unavailability” of this product in the Philippine market. Even if you attempt to purchase Dexpan online, shipment of this product in the Philippines is not supported.

Fortunately, I came across a company called “Johnny Air Plus”. Through their services, Filipinos can now purchase any products from Amazon which include Dexpan. You can read more about it on this post, Buying Dexpan….

33 Comments to “Dexpan Concrete Demolition for Philippine Treasure Hunters”

    • Sir Elmo. Can you help us? We dug about 5 feet deep right on an old well where we encountered a square concrete that is very hard to break even if we use big hammer. In your own opinion, is it possible that the square concrete contain the deposit?


      In my own opinion, “yes” it is possible and you may want to use Dexpan to break it.

    • Sir Elmo, my parents found a sign of turtle that has no heads tails and feet. When day dig downwards, they found a rock with a hole and a flat stone engraved letter hj and k at about 5 feet where the flat stone was found. Can you help us or if you’re interested with this please message me. I’m from Kiangan Ifugao where Yamashita was captured. Thanks.

      • That is interesting. My interpretation to those engrave signs means that there is something buried underneath. However, I am not sure if it is referring under that flat rock.

    • Can you help us Sir, we dug about 40 feet then we saw 4 big wood and 1 is bigger than 3 bigger than barrel. After that, we saw a big green its look like cement but its not so very hard and the inner of that big green cement is going to harder than harder.

      Please help us Sir. We are in Philippines now. Thanks.

    • I suggest that you continue breaking it.

    • Sir can you contact me? This is about a large bunker. I need your help about this Dexpan. You can text me here 0906 972 XXXX. We can help each other.

    • I suggest that you should be the one who will contact me instead on my FaceBook page if you want a private conversation.

    • Sir we can not drill a hole in it. We bought a new bit but even scratch nothing happened and the new bit was destroyed.

    • Are you using diamond tipped drill bit?

    • Sir Elmo, how deep we should drill before putting Dexpan?

    • Drill deep as much as possible. The deeper, the better.

    • Mr. Elmo, how can you use a hammer drill in a remote, off the grid area? Do you carry with you a portable generator? or would a rechargeable hammer drill be enough? and how deep should the holes be? Thanks for the info.

    • Yes, we use rechargeable hammer drill but if the drilling process requires more work then we bring our portable generators.

      About the depth of the holes, try to drill deep as much as possible.

    • Good day Mr. Elmo, your reply is much appreciated however, I have a follow-up question though.

      About the hammer drill. As you know, there's a lot of different types out in the market. And it's a waste of time and money to just buy one only to find out that it couldn't do the job. So if you please, could you provide me with specifications and type of rechargeable hammer drill that's suitable for that Japanese bunker grade II cement. Or maybe you could just tell me what brand you use. I hope its not too expensive though. If it is, could you recommend a cheaper brand which can produce the same result? And also, just found out, there are 3 types of Dexpan Demolition Agent. Types 1,2 and 3. I think it's for the different temperatures. A certain type for a certain temp. Does that really matter? What type do you use?

      Thanks for your time reading and hopefully replying to this. Sorry for the bother but I think you're the only one who can help me with this. A ton of thanks in advance and more power.

    • Any hammer drill should work but I suggest that you should buy those that with top or popular brands such as Black and Decker, Bosh, Makita and etc… Anyway, the key in drilling a hole in a Japanese Grade II Cement is not from the hammer drill but more on the drill bit. You should use the diamond drill bit.

    • Those are top of the line brands and also the most expensive ones, affordability could be an issue. So I will have to go with your advise that any hammer drill will do. Just have to find a good one in some surplus shop. Its the drill bit that I have to save up for. Diamond tip sounds really expensive. Anyway I still have until next summer to prepare these stuff, can't wait to see how Dexpan works.

      Thanks for you time Mr. Elmo, you give awesome awesome advise and input to us small time THs. This has been Jowi AuH.

    • Aside from Dexpan. Is there other chemical than can break concrete cement?

    • There are so many other alternative but they can only be purchased from the black market.

  • Sir,

    Where can I possibly buy DEXPAN? How can I contact you Sir?

    • Try Amazon or contact Dexpan’s Official Company website.

  • Sir, how can we notice the legitimate Dexpan? Is there a possible fake product?

    • I am not aware if there are fake products of Dexpan but you can easily distinguish it through the label of the manufacturers especially from where they originally came from.

  • Thanks for the questions and answers! I got the idea on how and what to do and where to purchase dexpan.

    Thank you sir Elmo, how can I get back it to you? I would like to say thanks if this concrete cover will demolish.

    • You have to give it an actual try first. If it does not work then you can come back here ask about it.

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