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Ground Rods, Accessories

GEM Ground Enhancement Material

PH19871m
PH36800m
PH36802m
PH36805m
PH36807m
PH36820m

Ground Enhancement Material (GEM) is a superior conductive material that solves your toughest grounding problems. It is the ideal material to use in areas of poor conductivity, such as rocky ground, mountain tops and sandy soil. GEM dramatically reduces earth resistance and impedance measurements. Furthermore, GEM may reduce the size of the grounding system where conventional methods are unsatisfactory. Once installed, GEM is maintenance-free, not requiring periodic charging or the presence of water to maintain its conductivity.

  • Maintains constant resistance for the life of the system once in its set form
  • Performs in all soil conditions even during dry spells
  • Does not require periodic charging treatments or placement
  • Does not require the continuous presence of water to maintain its conductivity
  • Fully sets within 3 days, fully cures within 28 days
  • Does not dissolve, decompose, or leach out with time
  • Non-corrosive
  • Reduces vandalism and theft since conductors are hard to remove from concrete
  • Can be installed using trench or ground rod backfill methods
TypeGEM25A
Package25 kgs/bag

 

Suggested Specifications

ParameterRecommended ValuesTest Method
Standards ComplianceCompliance to

IEC 62561-7 EPA Toxicity

Characteristic Leaching

Procedure (TCLP, TEST METHOD 1311)

lEACHINGArsenic < 1.5 mg/L, Barium < 60 mg/L,

Cadmium < 0.15 mg/L, Chromium < 3.0 mg/L,

Lead < 1.5 mg/L, Mercury < 0.06 mg/L,

Elenium < 1.0 mg/L

EC 62561-7

EN 12457-2

Sulfur Content< 2%ISO 14869-1
Resistivity<2 Ω-cm for powder

<20 Ω-cm for mixed and cured material

Compressed powder

according to ASTM G187-12

Mixed and cured per

Corrosion PerformanceFor copper-plated earth electrodes,

the polarization resistance shall be

> 8 Ω x m2 for aggressive environments

For galvanized earth electrodes,

the polarization resistance shall be

> 7.6Ω x m2 for aggressive environments

IEC 62561-7, Sec 5.5,

aggressive environment

Flexural Strength300-450 psi [2070-3100 kPa]ASTM C293
Compressive Strength100-200 psi [690-1390 kPa]

after 672 hours curing time

ASTM C109

 

Estimated Linear Feet of Ground Conductor Covering with Each Bag of GEM

Trench WidthTotal Thickness of GEM
incmincmincm
InchesCentimeters410.2512.7615.2
4103.51.0m2.80.8m2.30.7m
615.29.30.7m1.80.5m1.50.4m
820.370.5m1.40.4m1.10.3m
1025.45.60.4m1.10.3m0.90.3m
1230.54.70.3m0.90.3m0.70.2m

 

Estimated Bags of GEM for Backfilling Around Ground Rods to a Density of 63.5 lb/ft ³ (1,017 kg/m³)
Diameter of Holeftmftmftmftmftmftm
InchesCentimeters51.561.882.4103154.6206.1
410.2222345
615.23345810
820.356891418
1025.47912142128
1230.5101216203040

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