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FAQ ITO-Coatings

Frequently asked questions in regards to our ITO-coated glass products

Go to the data sheet of our ITO-coatings

Here you will find the FAQ in regards to our ITO-coated materials and to ITO-coatings in general. If you can't find an answer to a question you might have, please feel free to contact us with your question. We will be pleased to share all available information with you.

 

What is the micro roughness of your ITO-coatings?

Do you stock any standard dimensions?

Can you do custom dimensions?

What is more economical, round or rectangle shapes?

Can you do ITO with custom surface resistances?

What is the typical delivery time for parts with custom dimensions?

Can you coat other substrate materials than the ones listed?

Can you coat ITO on substrates that I supply?

Can you coat plastics with ITO?

Why can't I define both at the same time, the film thickness and the surface resistance?

What is the technical difference between your CEC-S and CEC-P coatings?

Can you make bus-bars or do you offer options for contacting the ITO-coated surface?

Do you make ready-made heatable windows with wires connected?

Do you make ITO-coated microscope slides?

Do you have a price-list for your ITO-coatings?

What is the thinnest possible substrate glass thickness?

What is the transmission specification of your ITO-coatings?

Do you have transmission or reflection curves?

Can you manufacture index-matched-ITO (IMITO)?

What is the smallest and the largest surface resistance you can coat?

Where is the SiO2-passivation layer located and what is it good for?

Do the SIO2 layers of the CEC-S and CEC-P coatings cause extra cost?

Why are there coating types with an undefined (n/a) ITO film thickness in the table?

Do you offer patterned-ITO-coatings, patterning or masking services?

 

All given details and specifications are mean reference values and are not guaranteed.

In addition, please consider our "Notes on technical specifications"














































































































Q: What is the micro roughness of your ITO-coatings?

A: It is not practicable to inspect the surface of each single ITO-coated glass at a nanometer level. We therefore generally do not make a binding specification on the micro roughness. If we would specify the micro roughness, we would have to do a 100 % surface inspection on a nanometer level with an atomic force microscope (AFM). This would mean that we would have to inspect the complete surface area of each single of the many million ITO-coated substrates and windows we make. This is of course not practicable.
However, many of our customers are successfully using our ITO-coated materials for applications where the micro roughness is critical. For some of our coatings of the CEC-P and CEC-S Series, we have typical AFM surface-roughness test reports. We will be pleased to share these test results with you on request. Again, please consider that these measurements are from random batches random snapshots that were taken from a randomly selected production batch. These measurements do not present a specification.


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Q: Do you stock any standard dimensions?

A: A great advantage to our customers is, that we as a manufacturing company are not forced to be limited to standard dimensions like most trading companies. Almost every customer needs different dimensions and it often is a great advantage to the user to get the part dimension really required for his application. To be able to be quick even at custom sizes, we permanently make numerous ITO-coated materials which you can find in this table. Please choose a material you are interested in and pick an available glass substrate thickness from the table, enter the size and fill out our comfortable request form. You are absolutely free to specify the dimensions! You typically will receive individual quotation the same day we received your request. Typical delivery time for precision CNC-cut parts with customized dimensions, made from any of the stock materials is 1-2 weeks, provided the tolerances or required manufacturing steps or heavy production load do not make a longer lead time necessary.


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Q: Can you do custom dimensions?

A: Yes of course! This is our speciality. Please just send us your inquiry and we will return a quotation for your custom sized part usually on the same day we receive your request.


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Q: What is more economical, round or rectangle shapes?

A: Generally said, rectangle shapes are more economical to make than round parts, especially at small quantities. At large and very large quantities, this cost difference gets significantly smaller, but the cost will never end up on the same level. Of course this depends on the details but a rectangle part with moderate tolerances compared to a round part with same tolerances will typically be more economical.


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Q: Can you do ITO with custom surface resistances?

A: Yes, we can. This however is only possible on a per coating batch basis. This means it is only possible if the quantity is large enough for a custom coating-run. It is not possible or extremely uneconomical at single pieces or at small quantities. Small quantities would result in extremely high piece prices, because the total coating run cost remain about the same, no matter whether one piece or the full batch is coated. If you want to know what quantity will be required for a custom coating batch, please send us your detailed request and we let you know whatever is possible or reasonable.


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Q: What is the typical delivery time for custom sized ITO-coated windows or substrates?

A: This depends on the tolerances and complexity of your parts and of course on the required manufacturing steps. Not at least, it also depends on our production load. To give you an example, for precision CNC-cut square or rectangle parts with average tolerances at normal production load, a typical delivery time is less than a week!


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Q: Can you coat other substrate materials with ITO than the ones listed?

A: Yes! This however, is possible only on a per batch basis. The substrate material in any case must be a suitable glass. We usually do not coat plastics. However there are some exceptions depending on the technical performance of the respective plastic material. In case you want to get a special glass or plastic custom coated, please contact us with your inquiry and we will let you know the possible options.


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Q: Can you coat ITO on substrates that I supply?

A: Yes, generally we can custom coat customer furnished material. A requirement for this is, that your substrates are not already coated with any other coating and that the substrates are suitable to be ITO-coated. Please send us your inquiry with all details. Please consider that this requires at least a full coating run.


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Q: Can you coat plastics with ITO?

A: We usually do not coat plastics. However, there are exceptions depending on the technical performance of the plastic material. Please contact us with your inquiry.


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Q: Why can't I define both at the same time, the film thickness and the surface resistance?

A:The surface resistivity of an fully oxidized ITO-coating depends on the film thickness and vice versa. Hence it isn't possible to make a specification for both parameters because they depend on each other.


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Q: What is the technical difference between your CEC-S and CEC-P coatings?

A: The only difference between the CEC-P and CEC-S coatings is, that the substrates used for the CEC-P series are additionally mechanically polished. This results in an lower total thickness variation (TTV) and a better optical flatness, but at the same time it slightly increases the surface micro roughness. This is resulting from the micro scratches on nm level that are occurring when a glass is mechanically polished, which is a normal effect. In other words, generally the CEC-S coatings have a better (lower) surface micro roughness, and the CEC-P coatings show a better TTV and optical flatness.


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Q: Can you make bus-bars or do you offer options for contacting the ITO-coated surface?

A: We do not make bus bars on our ITO-coatings. However, as a special service, we supply electrically conductive adhesive copper tape to the customers of our ITO-coated materials.


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Q: Do you make ready-made heatable windows with wires connected?

A: No. We have many customers though, who use our ITO-coated materials to make their own heatable window or their heatable microscope slide.


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Do you make ITO-coated microscope slides?

A: Yes we do! We can make any size of ITO-coated microscope slide you want. Please choose an ITO-coated material you are interested in from the table here, click on an available glass substrate thickness and please let us know the size and quantity of the microscope slide you are interested in. We will send you a detailed quotation in return usually the same day we receive your request.


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Q: Do you have a price-list for your ITO-coatings?

A: No. As a manufacturing company we are not restricted to standard sizes and we do not have a price-list like trading companies. This is of great advantage, because you are absolutely free to specify the dimensions exactly you need them for your special application. Please choose an ITO-coated material you are interested in from the chart here, click on an available glass thickness and just let us know the dimensions and quantity you will need. We will send you a detailed quotation in return usually the same day we receive your request.


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Q: What is the thinnest possible glass substrate thickness?

A: The thinnest substrate thickness that can be coated is approximately 0,175 mm. We always make an ITO-coated thin glass, our CEC020T, with 20 Ω/sq which you might be able to use when you are in search of ITO-coated thin glass. Please see our chart here, which contains all available resistances and glass thicknesses and send us individual request. Also custom coatings are possible, provided that the quantity is large enough for a coating run.


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Q: What is the transmission specification of your ITO-coatings?

A: This depends on the surface resistance and therefore on the ITO-film thickness, the substrate material and on how good the refractive index of the glass used matches to the refractive index of the ITO-thin film. You can find typical transmission curves of many of our coatings here. If you need a typical transmission curve for a coating not listed there, please do not hesitate to contact us and let us know what coating you want the transmission information for.


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Q: Do you have transmission or reflection curves available?

A: Yes, you can find typical transmission curves of many of our coatings here. Also we have additional information on the transmission or reflection of many of our ITO-coated materials, which we can provide to you on request.


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Q: Can you manufacture index-matched-ITO (IMITO)?

A: Yes, but this however is only possible on a per coating batch basis and on request. This means the quantity must be large enough for a custom coating run. It is not possible or extremely uneconomical at single pieces or at small quantities. Please also consider, that the top layer of an IMITO-coating cannot be ITO, because an layer on top of the ITO is required to adapt the refractive indexes. This means, the ITO cannot be contacted as long as the layer(s) on top are removed.


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Q: What is the smallest and the largest surface resistance you can coat?

A: Generally the lowest square resistance we coat is around 5 Ω per square and the highest is about 1000 Ω per square. We regularly make various coatings in this range (please see chart here). If you need another square resistance, please send us your inquiry.


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Q: Where is the SiO2 passivation layer located and what is it good for?

A: The SiO2 passivation layer is located between the glass substrate and the ITO-thin film. In other words, the quartz barrier layer separates the Indium Tin Oxide from the glass surface. This quartz layer is only several nanometers thick and increases the electrical insulation. At the same time the layer minimizes leaching of alkali-oxides from the glass into liquid crystals, which is very function critical for display applications. Only our CEC-S and CEC-P coatings have a SiO2 passivation layer. All other coatings do not have a passivation layer. The SiO2 layer of our CEC-S and CEC-P coatings does NOT add any extra cost to our ITO-coated end product as it is an integrated process.


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Q: Do the SIO2 layers of the CEC-S and CEC-P coatings add extra cost?

A: The SiO2 layer of the CEC-S and CEC-P coatings does NOT add any extra cost to the ITO-coated end product as it is an integrated process. It just increases the technical product quality without increasing the cost. The CEC-S and CEC-P coatings are even our most economical ITO-coatings although they are the only ITO-coatings with a standard passivation layer.


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Q: Why are there coating types with an undefined (n/a) ITO film thickness in the table?

A: All coatings without defined ITO-film thicknesses are made in a smaller coating machine. Those ITO-coatings are mainly based on "exotic" glass substrate materials and we don't make them at very large quantities like our CEC-S or CEC-P coatings for example. In the smaller coating chambers, only the transmission and the surface resistances are monitored during the coating process. The film thickness is a result of these parameters and is not process controlled. We therefore do not make specifications on the film thickness of these CEC-coatings. Roughly said, the film thickness will approximately be in the range of the CEC-S coatings.


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Q: Do you offer patterned ITO-coatings or patterning or masking services?

A: Sorry, no we do not offer patterned ITO-coatings or masking services at all. Our customers usually do the patterning themselves by etching away some areas of the ITO-coating. For some of our coatings we give out typical, non-binding etching recommendations on request. If you are interested in obtaining these, please contact us.


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