MODIFIED GUAR GUM IS VISCOSIFYING AGENT
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Specification of Modified Guar gum/Geltex
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PHYSICAL STATE
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The Material, as received, should be white to creamish
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White free flowing powder, free from lumps and other impurities.
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Moisture Content at
105+/- 20C. % by mass maximum : 15.00
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pH of 1% solution in
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Distilled water at 26 +/- 20C.
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Dispensability in betonies suspension:
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Prepare a 3% (w/v) bentonite suspension in distilled water
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Using approved bentonite and stir in a multimixer for 15 minutes.
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Add to it 1.5% (w/v) of the modified guar gum sample slowly.
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While stirring in a multimixer and stir further for 30 minutes.
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Dilute the suspension with water and pour the suspension on a 60
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Mesh B.S.S.Sieve (or equivalent). Wash the mud on the sieve with a slow stream of water with gentle tapping.
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The residue left on the 60 mesh B.S.S.sieve (or equivalent) should not: 2.5% Exceed with respect to the weight of the sample added.
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Apparent viscosity of suspension at:
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26 +/- 20C. CP
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Prepare a 1.0% (w/v) suspension of the modified guar gum sample in
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Distilled water
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Sea water.
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Saturated salt water
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5% (w/v) CaCo3 solution (maintain pH of CaCo3 at 9.8 – 10.0 before addition of sample) by stirring in multi mixer for 30 minutes. Age the suspensions as prepared above for 30 minutes at 26+/- 20C. After the lapse of the aging period, stir the suspension for 5 minutes. Determine apparent viscosity of the suspensions at 26+/- 2°c which should be as follows
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In distilled water, cp, : 65 (minimum)
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In sea water, cp, : 65 (minimum)
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In saturated salt water, cp, : 75 (minimum)
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In CaCo3 solution, : 65 (minimum)
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PACKAGING: 25 kg Material is packed in HDPE bags with extra polythene liner inside.
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