Purity

 92% min.

 95% min.

 98% min.

99.5% min.

MgO

 15% min.

 15.5% min.

 16% min.

16.24% min.

Mg

  9% min.

  9.35% min.

  9.65% min.

9.8% min.

S

  12% min.

  12.2% min.

  12.6% min.

12.8% min.

Cl

  0.30% max.

  0.30% max.

  0.30% max.

0.014% max.

B

1.0% max.

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--

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Fe

1.0% max.

20 ppm max.

20 ppm max.

20 ppm max.

Pb

10 ppm max.

10 ppm max.

10 ppm max.

10 ppm max.

As

3 ppm max.

3 ppm max.

3 ppm max.

3 ppm max.

Cr

3 ppm max.

3 ppm max.

3 ppm max.

3 ppm max.

Cd

3 ppm max.

3 ppm max.

3 ppm max.

3 ppm max.

Insoluble in water

0.10% max.

0.10% max.

0.10% max.

0.10% max

PH(5W/V%Sol)

5-8

5-8

5-8

 5-8

Appearance

White Crystals

White Crystals

White Crystals

White Crystals

Granular Size

0.1-2mm

0.1-2mm

0.1-2mm

0.1-1mm, 1-2mm,

2-3mm