Drilling
- Drill holes using an air hammer drill and appropriate drill bit specific to the rock type.
- Holes should be drilled no further than 30-60cm (1ft-2ft) apart. Note: In reinforced concrete recommended no more than 20cm (8”) apart.
- Recommended hole diameter 38mm - 50mm (1 ½" - 2.0"). Depth would be 70-90% of the way depending on the type of rock/material to be removed.
Mixing
- For regular safety reasons and mixing small amounts by hand, it is recommended to use rubber gloves.
- In a bucket, combine 1.5 Liters of water to one 5kgs bag of Dexpan. Or pour water and Dexpan as a rate of 1:3 units by weight.
- Mix well, using a drill and paddle is recommended. If mixing with a stick or other method, make sure powder is completely dissolved into the water. Mix to a slurry.
Filling
- Clean holes before filling using air hose remove excess dust from drilling.
- Dexpan slurry should be poured into holes within 10-15 min. after mixing. Do not fill to the top, only fill the holes about 15mm (½” to 1”) from the top.
- Mix well and pour into holes while agitating the hole to make sure no air gaps are in the hole. Example: Using a piece of rod or stick to poke holes.
- For Horizontal holes, a grouting pump would be most reliable to poor.
Cracking Or Cutting Time
The cracks appear in 45-60 min. after filling, depending on the weather, rocks, and concrete type. The cracks become wider within time (maximun 48 hours expanding time).
Recommendations
- A pair of safety glasses, rubber gloves and dust-proof mask is required.
- After filling do not look directly into the holes to avoid any accident to be caused by blown-out shots.
- Keep Depxan in Dry storage and keep out of reach of children.
- Make sure you select the correct temperature of Dexpan specific to the weather.
Usage Tips
- The best time to use Dexpan is early in the morning or evening when temperature of material is low.
- Cover holes to avoid direct sunlight. Example a tarp to provide shade or wet hay.
