Questions and Answers

General

How can I buy Uroboros products?

How do I get to Uroboros’ location?

Do you give factory tours?

Can I select my glass at the factory?

What do your Product Codes mean?

What are your sheet sizes, and how many fit in a case?

How do you color the glass?

Can I get a custom-made color?

How do you come up with new products?

What is "UNCAT" glass?

What is “V-Series” glass?

Art Glass

What types of glass do you recommend for Tiffany-style lamps?

How do you make Ring Mottles?

How do you make Ripples?

Is Uroboros Art Glass fusible?

Fusing

What is System 96®?

Is Uroboros fusible glass compatible with Bullseye?

Is Uroboros fusible glass compatible with Schott – Artista?

What firing schedule should I use with your glass?

What are the Physical Properties of your fusible glass?

How much glass do I need to fill a mold?

Does Uroboros make Borosilicate rods or sheets?

 

How can I buy Uroboros products?

Select products including FX 90 fusible, casting products, Rods, Uncat sheets and samples can be bought directly from us in person or from our Online Store. Otherwise, visit one of our quality Retailers or Wholesale Distributors in your region. Find those dealers right here.

How do I get to Uroboros’ location?

We are very near to downtown Portland, Oregon, at 2139 N. Kerby Ave., Portland, Oregon, 97227. You can use the Google maps link in our Contact Us Section. Or, just give us a call at 503-284-4900 and we’ll talk you in!

By public transit: 

Take the MAX Yellow Line train to the Albina/Mississippi stop. Walk 1 block South to N. Thompson then turn left and walk 1 long block (East) to N. Kerby. This will take 5 minutes or less. Our front entrance will then be on your right on N. Kerby.

Or by bus, take #35 Greeley (North towards University of Portland) to the N. Interstate & Tillamook stop (#11840). Walk East along N. Tillamook 1 long block to N. Kerby, turn left 1 block to our front entrance on your left. This will take about 3 minutes.

Do you give factory tours?

We sure do! We’d appreciate a call a day or two before your arrival so we can schedule someone to meet you (more important for groups of 5 or more), but even if you haven’t called, just drop by. We’ll be glad to see you.

We can accomodate tours Monday through Friday business days between 9:00 a.m. and 4:00 p.m. Tours take about 20 minutes once you get started. And, for safety’s sake, please wear closed-toe shoes, not sandals.

Can I select my glass at the factory?

Yes, all items are available for hand selecting with preapproval from your glass supplier. Simply ask them to call us and alert us of your visit. Select items are available for direct sale, including FX 90 products, casting products, Rods, and Uncat sheets. If you are selecting glass, you must wear long pants such as jeans, and closed-toe shoes, not open-toed sandals. We will provide gloves and safety glasses for your use while handling glass.

What do your Product Codes mean?

Good question! While probably of more use to us than to you, here is how the code is structured using 60-56-90-IR as an example. This represents a sheet of Double-Rolled Smooth (60-), Black (-56), FX90 Fusible (-90), Iridescent (-IR) glass.

    Diagram

Prefix codes are: F for Frit, N for Noodles, S for Stringer, B for Billets, CR for Casting Rocks, for example, F5-56-90-IR means Frit, Coarse, Black, FX90 fusible, Iridescent and S-56-90-5 means Stringer, Black, FX90 fusible, 5 ounces, etc.

What are your sheet sizes, and how many fit in a case?

Our sheet sizes vary with the different product categories. Learn all about them, and how we pack them in the Product Information section. There is a separate info sheet for each product category.

How do you color the glass?

Color is created by adding metallic oxides to the glass batch (mix). Some examples are Cobalt (deep blue), Copper (aqua blue, green or red), Manganese (purple), Gold (pinks and purples) and Selenium (reds and oranges). Many different oxides are needed to create a full palette of glass colors. We combine them to make lush, complex, natural looking colors.

Can I get a custom-made color?

Yes, if it is within our production capabilities. For custom base colors, we will need a color sample (glass or any other material) to start with. We will usually charge a fee for color development and matching. For custom combinations, blends, or textures using our existing base colors, we just need to know what you need. In either case, we’ll be happy to discuss your needs with you to determine the feasibility. Prices are a notch above equivalent standard colors, and minimum production quantities will apply.

How do you come up with new products?

We listen to glass users! And we experiment. And we record and consider all your suggestions, employees’ suggestions, historic art and happenstance. Our color committee meets regularly to discuss possible new products and colors. We’re always eager to hear about ideas for new products and colors that will ‘kick it up a notch’.

What is "UNCAT" glass?

Uncat is short for Uncategorized. These are non-standard mixes, experimental, or just unique colors created either deliberately or by happenstance during the production process. They result when we have leftover components from a standard run or when we are experimenting with new colors. These are some of our most spectacular glass sheets, and they are all one-of-a-kind. Many artists look forward to a new shipment of Uncats arriving at their supplier, since they broaden their palette greatly.

What is “V-Series” glass?

V-Series products are those that ‘vary’ (hence the ‘V’, get it?) from standards a little bit than we like. We try mightily to keep standard grade items very similar to what folks have seen in a sample set or have used before, so no one gets a surprise when they open the box. But it stands to reason that some items fall just outside our parameters for a standard. These are graded as V-series, with a V added to the front of the standard ID code, as in V65-95. V-series items are intended to be easily recognizable as similar the standard, but they will vary from the standard in mix, a slight variation in one or more colors, or a minor missing color in a multi-color mix. Also, the color after fusing may sometimes shift more than normal, so it’s up to you to pre-check to confirm the fuse color before you load up a big kiln full. Check out our V-series at your favorite supplier – we’re sure you’ll like how they look – and you’ll definitely like the price!

What types of glass do you recommend for Tiffany-style lamps?

We have developed glass and color recommendations for most popular Tiffany lamp designs. These PDFs show the recommended glass types and colors, plus the amount of glass needed for each lamp. Check them out in the Product Information section of this website.

How do you make Ring Mottles?

Simply stated, Ring Mottles are made by creating the right chemical and temperature conditions to cause local variations in the crystalline growth (opacity) in the glass. Learn more.

How do you make Ripples?

Ripples in glass are made by sliding the top surface of the glass over the bottom surface during rolling, causing the top surface to bunch up as ripples. Smooth ripples are made with a smooth top roller, and rough ripples are made with textured rollers. Herringbone ripples are made while the top roller is zigzagged back and forth during the rolling process. Check out our Ripple Textures in our Art Glass Category.

Is Uroboros Art Glass fusible?

This category of products were not designed for fusing. The physical properties of fusible glass that fusers depend upon, such as narrow expansion point limits, low devitrification, and color and opacity stability are not built into these formulas. But we do understand that folks do fuse with ‘non-fusible glass. Of course the glass will melt, and the pieces will flow together, but if you do this you’ll have to expect dramatic changes in the appearance of many of the glass types. Many will fuse with stresses high enough to cause cracking, or Ring Mottles for example will develop into an almost solid opaque opal. All in all, we want everyone to have fun and be successful with our glass. If you do decide to throw Art Glass into your fusing kiln, be ready for some surprises, and please keep your sense of humor intact!

What is System 96®?

Our System 96 products are the result of a cooperative alliance with our friends at Spectrum Glass of Woodinville, Washington. In 1999 we committed to mutually launch a broad-purpose product line of fusible glass products. System 96 is the result, reflecting the strengths of both companies. Uroboros makes the more specialized sheet styles, Frit, Noodles and Stringer, Rods and specialized kiln casting glass Spectrum produces a vibrant color palette of super-smooth, single-color sheets at affordable prices. Learn more and browse the products.

Is Uroboros fusible glass compatible with Bullseye?

Yes, our FX90 fusing glass is designed to be fully compatible with Bullseye products. Wide ranging tests by independent experts have repeatedly confirmed the full compatibility of the two brands. Artists have been mixing the two successfully since 1989 – more than 20 years!

Is Uroboros fusible glass compatible with Schott – Artista?

Neither our FX90 nor our System 96 products are designed to be compatible with Artista. While it may be possible that some individual colors can be fused successfully with certain Artista colors, this is due to a lucky convergence of COE and viscosity mismatches, not by design. We do, however, produce a range of tested compatible colors exclusively for Schott’s ‘Artista’ product line. These are available through Artista dealers worldwide. If you are an Artista user, you can recognize our sheets by our sheet size and surface texture.

What firing schedule should I use with your glass?

We have compiled (from real life kiln working experience) a complete set of firing guidelines for fusers, kiln casters and torch workers in the Resources section of this website. In general, Uroboros FX90 fires similarly to Bullseye fusible products, while Uroboros System 96 fires right along with Spectrum System 96 products at 10 - 20 degrees F lower than 90 COE products. For unusual or large scale projects please contact us for further guidance. For further information on fusing techniques and temperatures read: Glass Notes by Henry Halem, The Fused Glass Handbook by Gil Reynolds, Contemporary Warm Glass by Brad Walker, and Firing Schedules for Glass by Graham Stone.

What are the Physical Properties of your fusible glass?

Physical properties such as Annealing and Strain points, and Specific Gravity, of our glasses vary slightly between product categories. Please visit the Resources tab of this website for Product Information, and choose the COE category you are interested in.

How much glass do I need to fill a mold?

And in general, our own Bill Ward recommends from experience that when in doubt about the glass amount needed, its always better to slightly overfill than to underfill. Slight overfills can usually be fixed with cold working, while underfills often require a second firing.

Does Uroboros make Borosilicate rods or sheets?

Sorry but we do not.