Mica Shields (Gauge Glass Mica)

Mica Shields are widely used in visual liquid level gages to protect the glass surface from the corrosive effects of hot alkaline or acidic solutions. Mica shields are also commonly used in steam water applications to prevent etching and the weakening of the glass

Mica Shield Selection: The quality of mica used in visual liquid level applications is determined by visual examination where the suitability is assessed on the basis of appearance. In this process of quality evaluation emphasis is placed on clarity, color, flatness, hardness, stains, visible inclusions and structural imperfections. As a result of this procedure, Mica is classified according to grades

The most common mica grades used in liquid level gage applications are as follows:

V2 Green Mica Clear and slightly stained - navy grade quality, hard, of uniform color, may contain slight crystallographic discoloration, free from all vegetable and mineral stains, cracks, buckles and other similar defects and foreign inclusions except for a few tiny air inclusions in more than one-fourth of the useable area.

• Suitable for saturated steam service from 600 to 1500 PSIG
• Conforms to ASTM D351 specifications
• Government spec. number: MILG-18498A
• Thickness from .009 to .012 in single piece or in two pieces (the thinnest not less than .0045).

V4 Green Mica good stained - hard, of uniform color, may contain slight crystallographic discoloration, free from vegetable and mineral stains, cracks, buckless and other similar defects and foreign inclusions, except somewhat wavy but not rippled, may contain some air inclusions in not more than two-thirds of the usable area.

• Suitable for saturated steam service from 300 to 600 PSIG.
• Conforms to ASTM D351 specifications and the Government spec. number: MILG-18498A
• Thickness from .009 to .012 in single piece or in two pieces (the thinnest not less than .0045).

 

Standard Mica Shield Sizes (mm) No     0 I II III IV V VI VII VIII IX X XI XII XIII XIV MICA SHIELD (TYPE A/B ) Length   Breadth 95 x 24 115 x 24 140 x 24 165 x 24 190 x 24 220 x 24 250 x 24 280 x 24 310 x 24 320 x 24 340 x 24 360 x 24 370 x 24 400 x 24 430 x 24 MICA SHIELD (TYPE A) Length   Breadth 95 x 30 115 x 30 140 x 30 165 x 30 190 x 30 220 x 30 250 x 30 280 x 30 320 x 30 340 x 30 370 x 30 400 x 30 430 x 30 460 x 30 500 x 30 MICA SHIELD (TYPE B/H ) Length   Breadth 95 x 34 115 x 34 140 x 34 165 x 34 190 x 34 220 x 34 250 x 34 280 x 34 320 x 34 340 x 34 370 x 34 400 x 34 430 x 34 460 x 34 500 x 34 MICA SHIELD (TYPE TA-28) Length   Breadth 133 x 47 158 x 47 183 x 47 208 x 47 238 x 47 268 x 47 298 x 47 338 x 47 358 x 47 378 x 47
Standard Thickness 0.10 - 0.15 mm/0.13 - 0.17 mm. 0.15 - 0.20 mm/0.18 - 0.22 mm 0.20 - 0.30 mm/0.30 - 0.40 mm.

The above sizes are not the complete range. We can supply any size in any quantity.

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