Imerys, your partner from low to ultra high voltage AC & DC porcelain insulators

As the international market leader for industrial minerals, ceramic bodies and glazes, Imerys uses its unrivalled

product portfolio, commercial and technical expertise to offer mineral solutions to the global electrical porcelain

industry.

Imerys’ guaranteed consistent minerals help you to maintain constant high yields during the production of

insulators.

Our mineral solutions contribute to the high performance of your electrical porcelain insulators to safely

maintain and distribute energy and power in all environments.

Mineral Solutions for Electrical Porcelain InsulatorsTechnical datasheets

BALL CLAYS

BODIES

TYPICAL DATA Hymod Sigma

Hymod Prima

Hymod Blue

Hymod KC

M&D Old

Mine #4

Todd Light

Thaiplas BC2

ParaCast Plast

CHEMICAL ANALYSIS (%)

SiO2 54 54.0 53.0 54.0 56.0 59.7 58.4 60.0 48.8

Al2O3 30 30.0 31.0 30.0 27.6 26.3 27.6 24.0 33.2

Fe2O3 1.80 1.40 1.40 1.40 2.2 1.3 1.8 2.50 2.3

TiO2 1.00 1.20 1.00 1.10 1.5 2.0 1.5 0.76 1.2

CaO 0.30 0.30 0.30 0.30 0.5 0.20 0.3 0.35 0.1

MgO 0.50 0.40 0.50 0.50 0.7 0.5 0.6 0.64 0.2

K2O 3.00 3.10 3.00 3.10 0.6 1.1 1.3 1.95 1.3

Na2O 0.40 0.50 0.40 0.40 0.2 0.20 0.2 0.16 0.1

L.O.I. 9.00 8.8 9.2 8.7 10.7 9.3 10.6 10.0 12.5

CARBON (%) C 0.3 0.3 0.55 0.6 0.2 0.5 0.9 1.0 -

PARTICLE SIZE ANALYSIS (%)

> 53 µm 0.4 0.3 0.3 0.4 1.6 1.6 1.0 2.0 -

> 8 µm - - - - 2 10 8 5 -

< 2 µm 88 88 89 86 89 72 66 75 74

< 1 µm 80 79 79 78 82 65 57 65 63

< 0.50 µm 68 67 65 65 73 54 46 54 50 -

SPECIFIC SURFACE AREA (m2g-1) 38 41 38 34 41 23.1 27.7 32 25.2

UNFIRED MoR

At 80% RH (MN m-2) - - - - 7.0 3.0 6.2 5.23 -

At 80% RH (p.s.i.) - - - - 995 425 880 759 -

Dried at 110 °C (MN m-2) 8.0 8.0 8.0 7.5 14.6 6.3 8.4 10.8 3.2

Dried at 110 °C (p.s.i.) - 1140 1140 1065 2080 900 1195 1563 464

FIRED AT 1180 °C Oxidizing atmosphere

Water absorption (%) 2.5 2.5 2.5 2.0 5.0 10.5 8.9 4.7 -

Contraction (%) 12.3 12.5 12.2 12.0 10.5 6.6 9.9 10.9 -

FIRED AT 1240 °C Oxidizing atmosphere

Water absorption (%) 1.2 1.5 1.5 1.5 4.2 8.5 6.1 0.1 -

Contraction (%) 12.8 13.0 12.6 12.5 11.0 7.7 9.5 10.2 -

FIRED AT 1280 °C Oxidizing atmosphere

Water absorption (%) - - - - 3.0 7.8 5.6 0.7 -

Contraction (%) - - - - 11.7 8.9 9.0 9.5 -

TYPICAL DATA C 130 C 120

CHEMICAL ANALYSIS (%)

SiO2 34.2 45.2

Al2O3 59.8 48.2

Fe2O3 0.59 0.63

TiO2 0.28 0.22

CaO 0.31 0.25

MgO 0.55 0.51

K2O 2.70 3.90

Na2O 1.10 0.74

L.O.I. 5.2 4.8

PARTICLE SIZE ANALYSIS (%)

> 8 µm 20 31

< 2 µm 39 33

< 1 µm 29 25

< 0.50 µm 20 17

SPECIFIC SURFACE AREA (m2 g-1) 12 11

UNFIRED MoR Dried at 110°C (MN m-2) 5.0 4.9

Dried at 110°C (p.s.i.) 712 697

FIRED AT 1300 °C Reducing atmosphere **

MoR - Unglazed (MPa) ≥ 140 ≥ 90

MoR - Glazed (MPa) ≥ 160 ≥ 110

Water absorption (%) 0.05 0.03

Contraction (%) 9.1 8.8

** These bodies have been designed to comply with the relevant sections of IEC 60672 following appropriate processing at the manufacturer.Processing for these includes firing at 1300 °C in a reducing atmosphere. We can provide other electrical porcelain bodies for different temperature and atmospheres.

KAOLINS

FELDSPARS

TYPICAL DATA Rogers Samson #6 EP MRD Standard Remblend Grolleg

CHEMICAL ANALYSIS (%)

SiO2 46.5 46.7 45.5 48.0 48.0 49.0

Al2O3 37.5 38.1 38.1 36.0 36.5 36.0

Fe2O3 1.00 0.70 0.80 1.30 1.17 0.80

TiO2 1.30 1.50 1.40 0.05 0.05 0.05

CaO 0.30 0.20 0.20 0.01 0.07 0.06

MgO 0.30 0.10 0.20 0.01 0.30 0.30

K2O 0.30 0.20 0.10 2.10 2.25 1.96

Na2O 0.10 0.10 0.10 0.01 0.10 0.10

L.O.I. 13.2 13.4 13.5 12.5 12.0 12.0

CARBON (%) C 0.1 0.1 0.1 0.04 0.03 0.03

PARTICLE SIZE ANALYSIS (%)

> 53 µm max. 1.0 2.0 0.8 2.0 Max. 0.25 Max. 0.05

> 8 µm 4 5 5 26 19 8

< 2 µm 85 76 74 30 39 58

< 1 µm 76 67 62 19 29 43

< 0.50 µm 65 55 48 18 19 28

SPECIFIC SURFACE AREA (m2 g-1) 24 18 20 14 7 11

UNFIRED MoR

At 80 % RH (MN m-2) 3.1 1.9 1.7 0.3 0.5 1.0

At 80 % RH (p.s.i.) 450 275 240 36 70 140

Dried at 110 °C (MN m-2) 6.7 5.4 4.5 0.5 1.1 2.6

Dried at 110 °C (p.s.i.) 950 765 650 70 155 365

FIRED AT 1180 °C Oxidizing atmosphere

Water absorption (%) 12.1 12.7 16.7 14.7 16.5 13.0

Contraction (%) 9.7 11.2 8.2 4.4 7.0 9.0

FIRED AT 1240 °C Oxidizing atmosphere

Water absorption (%) 10.5 11.8 13.1 11.7 14.0 9.7

Contraction (%) 10.7 11.2 9.8 7.0 9.0 11.0

FIRED AT 1280 °C Oxidizing atmosphere

Water absorption (%) 8.9 9.1 10.1 9.9 9.5 6.5

Contraction (%) 12.1 13.2 11.0 10.0 10.5 13.0

TYPICAL DATA WhiteSpar Minspar 200 Minspar 250

CHEMICAL ANALYSIS (%)

SiO2 66.5 ± 1.0 68.8 68.8

Al2O3 18.2 ± 1.0 18.2 18.2

Fe2O3 Max. 0.10 0.07 0.07

TiO2 0.01 - -

CaO 0.25 1.5 1.4

MgO 0.03 Trace Trace

K2O Min. 11.0 4.1 4.1

Na2O 2.50 ± 0.75 6.5 6.8

L.O.I. < 0.3 0.3 0.08

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Teams dedicated to electrical porcelain insulators worldwideImerys has regional hubs in Asia, Europe, Africa, North and South America. Thanks to a global network of production sites across several continents, we have a large and varied portfolio. Our integrated logistics network offers customers the benefits of reliable supply chain services.

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These values do not represent a specification. The data quoted are determined by the use of Imerys Standard Test Methods, copies of which will be supplied on request. Every precaution is taken in production to ensure the products conform to our published data. Since the products are based on naturally occurring materials, we reserve the right to change these data should it become necessary. Sales are in accordance with our “Conditions of Sale”, copies of which will be supplied on request.

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