GREEN AS WHITE CAN BE

KAOLINS FOR RUBBER
Improving formulations through the use of natural minerals

www.imerys-kaolin.com

A WORLDWIDE
GROUPImerys Kaolin is a world leading producer of calcined kaolins, and hydrous
special functionality Kaolins untreated or surface modified to further
enhance the performance, and hard and soft kaolins. Imerys
supplies the Global rubber industries, offering strong technicalunderstanding of our products and their applications.
Imerys Kaolin investment in product and application development is a clear
commitment to our customers in the rubber industry.
Imerys Kaolin has a proven history of close technical collaboration withproducers,compounders and processors that has led to an in-depth
understanding of the mineral requirements of the rubber industry.
Kaolin is characterized by its fine particle size, lamellar or even hyper platy
unique particle shape and chemical inertness. This combination of platy
shape and fine particle size results in improved processability,improved reinforcement and improved mechanical properties like, tensile
strength, flexural strength, abrasion and tear strength, but also better
electrical properties.
.
Imerys kaolins can be a cost effective replacement/extender for more
expensive or difficult to process synthetic components (i.e. ground silica,precipitated silica, fumed silica, carbon black). Kaolin also provides barrier
properties which are beneficial when formulating compounds for hoses
and gaskets, whereas the Hyper platy kaolins can be an added value filler
in Inner Liner formulations.
Fully calcined kaolins and hydrous kaolins can be treated withfunctionalized silanes to give a particle surface capable of chemicallycoupling with the polymer. Filler dispersion is also improved. Due to the
reduced surface activity, Imerys functional kaolin clays give good
reinforcement and permanent set properties, maintaining very efficientcompounding process.

WHAT IS KAOLIN?
Kaolin (china clay) is a hydrated aluminosilicate crystalline mineral(kaolinite) with very high melting point and chemical resistance formed
over many millions of years by the hydrothermal decomposition of graniterocks. Hydrous kaolin is characterized by its fine particle size, plate like orlamellar particle shape.
Calcined Kaolin is an anhydrous aluminim silicate produced by heatingultrafine natural kaolin to high temperatures in a kiln. The calcination
process increases whiteness and hardness, improves electrical properties,
and alters the size and shape of the kaolin particles.
QUICK VIEW

KaolinKaolinTypical Aspect Ratio:

5:1 /100:1

Specific Gravity:

2.6

Refractive Index*:

1.56

MOH Hardness*:

2.5

Moisture: (max %)

1.0

pH:

4.5 - 7.0

Calcined Kaolin
Particle Shape:

Irregular, with surface voids

Specific Gravity:

2.6

KEY APPLICATION AND BENEFITS

Refractive Index:*

1.56

Reinforcement£ Resistance to chemical attack and very low chemical reactivity£ Low compression set for good sealing characteristics

MOH Hardness*:

4-5

Moisture: (max %)

0.5

pH:

6 - 7.5

Mechanical properties£ Tensile strength£ Flexural strength£ Abrasion and tear strength
Electrical properties£ High volume resistivity£ Low tan delta£ Low relative permittivity
Barrier and Low Permeability*The data quoted are determined by the use of IMERYS Minerals Ltd
Standard Test Methods

QUALITY RESERVESENGINEERED MINERALS

Imerys Kaolin enable a wide range of benefits for your final products
which ensure the most cost-effective formulation is delivered
without compromising the quality of your compound.

PRECISION PROCESSING
At state-of-the-art plants crude ore is engineered to carefully controlled
specifications such as particle size, specific surface area, colour and pH.
The unique nature of our deposits and processes gives precise functional
properties when selected for specific applications.

QUALITY CONTROL
Imerys Kaolin has developed a sophisticated method of analysing andbenchmarking its minerals based upon standard and customised tests.
Our quality management systems are ISO 9001 certified and, throughour individual team activities, we use carefully controlled processes toensure the product is always consistent and our aim is to remain theleader in quality in our industry.

ADDING VALUE THROUGH RESEARCH
Our experienced scientists and engineers work closely with ourcustomers’ plant and production managers as technology and rubber
formulations evolve, so we can offer problem solving advice forincreasing productivity or improving product quality utilisingexisting grades,innovative solutions or customised new productdevelopment. Our application development laboratories conduct basicand applied research, product development, process improvement andpilot plant operations.

ENVIRONMENTAL
Imerys Kaolin is committed to being a good neighbour to ourenvironment and we take this responsibility very seriously. We haveadopted the principles of sustainable development, which includes
extensive safety training programs and considerable investment inenvironmental
rehabilitation to protect the land for future
generations.

PRODUCT
Surface treated Calcined Kaolin

RUBBE
SilicRConOM
RuCa bbbe
POrle InUNDSsulaCa bti onle Ssheat
Hoshe
FootweFloo arrin
Pha g
rma
Sea ceuticals/ls
Tyr Gaskeests
PR O
CESExtrusi
SINoGnMoldingCal
endering
TY P
ICA
Brig
LAhtn
PPLessICA(GETIOd50%)
NSmicrons (sMoedig
is t urapre (h)maSpescifics%maGrax.)+5vity3µ(km (pg/m 3pm)
max.)

RUBBER OVERVIEWK E Y - R| Recommended | C| Can be Used

Polarite® 503S-RC

C C CCCCR CC91

1.2 <0.5 2.6 500

Polarite® 403A-RC

R R R

CCC

R C

C

91

0.6 <0.5 2.6 500

Polarite® 404S

R

CC

C C C

CCC

R R

C

91

0.6 <0.5 2.6 500

PoleStarTM 400

-CC

R C C

R

RC

R R

C

92

0.6 <0.5 2.6 200

GlomaxTM LL

-CC

R C C

R

R

C

R R

C

91

1.5 <0.5 2.6 200

GlomaxTM LX

-

R

C

R C C

R

R

C

R R

C

91

1.2 <0.5 2.6 200

PoleStarTM 450HP

-C

R

C C C

-C

C

R R

C

85

1 <0.5 2.6 300

PoleStarTM 450

-C

R

C C C

-CC

R R

C86

1 <0.5 2.6 300

Polarite® 903A

-C-

R R R

-

R

R

R C

R

861.4

12.6 200

Polarite® 703A

CC-

R R R

-

RC

R C

R

90.5 0.2

12.6Hydrite® Flat D-CC

R R R

-CC

R R

C

81.540.7 2.6 2500

Kaopaque® 10-

CC

R R R

-C

R

R R

C

89

0.7

12.6Hydrite® SB100

-CR

R C R

C

R

R

R C

C

86

1.2

12.6 200

Hydrite® SB60

-C

R

R C R

CRR

R C

C

88 0.4 <1.0 2.6 200

Hydrite® KC-CC

R C R-

RC

R C

R

86.5 0.4

12.6 50Suprex®

-CR

R R C

-

CR

R R

C

750.3

12.6 2500

Barden®

-

RC

R R R

-R-

R R

C-

0.3-

2.6-

Amlok 321

-

RC

C -

C-

C-

R R

C-

-3-

Mercap 100

-

C

R

R R C

-

CR

R R

C

93

0.3-

2.6 2500

Mercap 200

-

CR

R R C

-

CR

R R

C

93

0.3

-

2.6 2500

Soft Kaolin
Paragon-CC

R C R

-R-

R RC---

2.6

Calcined Kaolin

Surface Treated Hydrous clays

0Hydrous Kaolin-Hard Kaolin

Surface treated Hard Kaolin-MORE INFORMATION
Imerys Kaolin
100 Mansell Court East - Suite 300 - Roswell - Georgia - USA | Tel: +1 770 645 3300 | www.imerys-kaolin.com
Although the information in this document is believed to be accurate, it is presented without warranty of any kind and Imerys assumes no liability with respect to itsuse. No license to any intellectual property right is granted or implied. Statements or suggestions concerning possible use are made without representation or warranty that any such use is free of patent infringement, and are not to be construed as suggestions or inducements to infringe any patent.