Cera Dynamics Ltd.
Technical Solutions in Glass & Ceramics www.ceradynamics.com
Cera Dynamics Ltd (CDL) is the Technical Glass division of the James Kent Group of companies, specialising in highly-specified glass compositions and customised particle size distributions.
Cera Dynamics Ltd We produce high purity glasses on kilns that are constructed to our own unique and environmentally conscious design. Traditional “Open Fired” methods of melting glass can lead to the loss of volatile but vital chemical components from within the glass. Our kilns operate using the “Cold Crust” method of melting; this helps to lock in those volatiles that are part of the glasses composition. Along with both wet and dry grinding systems, and spray-drying, CDL can offer technical powders with bespoke particle size distributions, and in the case of inert glasses, customer selected levels of silane.
Inert Glasses Cera Dynamics produces Barium Oxide based glasses for typical composite applications as well as developing new formulations for future novel composites. With our melting and grinding facilities we are able to offer custom compositions or particle-size distributions based on the glasses below. DF 11
DF 12
DF 15*
DF 16*
DF 17*
SiO2-Al2O3-B2O3
72%
61%
75%
65%
73%
Radiopacifier
25% BaO
34% BaO/ZnO
18% SrO
31% SrO/Y2O3
21% Yb2O3
F
2%
2.5%
2.5%
2%
2.5%
Radio-opacity*
3.1
3.8
tbc
tbc
tbc
Refractive index
1.525
1.530
1.50
1.53
tbc
* New formulations for 2011, composition and final data to be confirmed Our grinding process produces a clean and highly-transparent powder, suitable for the most demanding of applications. The powders can be supplied with or without a silane coating.
Reactive Glasses Cera Dynamics is capable of producing a wide range of reactive glasses. Our kilns are specially designed to produce fluoridecontaining glasses with almost no loss of volatile components. We currently supply over 40 bespoke formulations to customers around the world. In order to assist our customers develop their own compositions, we offer the following compositions as the starting point for development projects. RG 3
RG 4
RG 5
BG 1
Radiopaque
Radiopaque
Radiolucent
Reactivity Modifier
SiO2
24%
24%
32%
47%
Al2O3
30%
30%
33%
32%
P2O5
7%
8%
8%
4%
RO
29% (Ca,Ba)
28% (Ca,Sr)
14% (Ca)
6% (Ca)
Na2O
2%
2%
4%
7%
F
14%
14%
15%
9%
Our reactive glasses are available as glass frit (water-quenched glass) or ground to a specific particle size distribution. The powders are spray-dried for optimum handle-ability without compromising their dispersion in liquids.
Grinding & Spray Drying grinding capabilities. We can control both the particle size distribution and fineness of our glass powders.
6 5
CDL Ground Glasses Typical Particle Size Distribution
10 9 8 7 Volume / %
Our ground materials are spray dried and can be prepared with a silane CDL Ground Glasses Typical Particleproduces Size Distribution coating. Spray-drying a 10 powder composed of clusters of 9 particles, loosely held together. This reduces the tendency of powders to 8 separate and to produce dust, whilst 7 not impairing the mixing with liquids. Volume / %
We have developed a grinding process for the production of high-purity powders for dental and medical applications. The high-purity and specific refractive index of our inert glasses make them suitable for use in highly-transparent dental composites. With reactive glasses we can fine tune the reactivity of the glasses through control of the average particle size and the width of the distribution. The graph gives an indication of the extremities of our
6
Rea
Rea
5
Iner
4 3 2 1 0 0.01
0.1 Reactive Glass (Broad) Reactive Glass (Narrow) Inert Filler (d50 < 0.7Âľm)
4
1 Particle Size / Âľm
10
Cera Dynamics Ltd
Fountain Street, Fenton Stoke-on-Trent, Staffordshire United Kingdom, ST4 2HB Tel: +44 (0)1782 744335 Fax: +44 (0)1782 574600 E-mail: sales@ceradynamics.com Website: www.ceradynamics.com An ISO accredited company
Cera Dynamics Ltd. is part of the James Kent Group