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Home  > Forum  > Special problems & miscellaneous  > Formulation of Crack/Joint Filler

Monday, 10 December 2018

Formulation of Crack/Joint Filler

6 Posts

Tuesday 17 July 2007 1:00:00 am

I would like to know what are the raw materials used to formulate the crack or joint fillers. I have tried some formulations but the final products seem to be cracking. In addition I would like to know what type of emulsion can I use, are there any special extenders or fillers that I can use? Also are there any special solvents for these products?

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Thursday 19 July 2007 1:00:00 am

Dear Mr. Buntu,
I can help you professionally.
You can contact me at aganja@rediffmail.com
Best regards
ambrish ganjawalla

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Saturday 21 July 2007 1:00:00 am

I need the formulation sent to my box.

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Sunday 22 July 2007 1:00:00 am

We manufacture waterborne Epoxy 2k and by using that along with silica powder and cement it can give crackfree strong crack filling compound.

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Tuesday 23 February 2016 3:24:08 pm

Hi Every body, I am new member here, Some one can give me best formulation of crack Filler for filling crack 8-10 mm. We checked some formulation but complaints comes, like crack appear after drawing, early dry, remove aggregate etc.

Leeroy Jenkins
DR.

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Tuesday 06 November 2018 10:27:48 am

Doublepost

Vasilis Mouratidis

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Thursday 22 November 2018 11:10:07 am

Important things to take in mind when formulating thick fillers are :

1. Particle size of filler (higher particle size means more filling power)
2. Oil absorption value (this shows how porous the material is and how much binder it needs to bind sucessfully)
3. Mohs hardness of fiiller (softer fillers usually give more flexibility but tougher fillers are usually better due to higher density, higher particle sizes and low oil absorption values)
4. Wetting properties (the system needs to be low enough in surface tension to wet both the filler material and the substrate)
5. Viscosity (high viscosity is great for application purposes but usually it means the product will not penetrate enough to stick to the substrate)

Usually calcium carbonate is used for fillers in high-build applications due to the balance between oil absorption and particle sizes.

e.g. a paste filler could have a calcium carbonate of 4-5 μm (d50) and an oil absorption of around 10-12 g/100g.

Essentially you need enough binder to fill most of the surface and pores of the filler material to keep the film from breaking.

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