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Frequently Asked Questions

How do I place an order?

Schools/Studios & Institutions

If your school or institution is ordering from Rovin for the first time, you can give Rovin your school’s contact info, address, and tax-exempt info (if applicable, this requires filling out a form from Rovin) and Rovin will arrange your first quote or sales order. Orders can be placed by phone, fax, or email. Our online checkout does not allow for a tax-exempt option.  Rovin accepts purchase orders, or POs as a method of ordering. You will need to fill out a credit application to be set up as a net 30 customer (meaning school may remit payment within 30 days of receiving invoice.) Once your application is complete you may begin ordering as a net 30 customer, however the first order will need to be paid up front in full.


Orders may be placed through our online store, phone, or email. Rovin clay must be ordered in increments of 25lbs and Laguna or Standard in increments of 50lbs. When ordering clay or online, you must type in the number of pounds rather than the number of boxes in the ‘quantity’ box, then add to your cart. Example: If you want to order 2 boxes of RO-14, type in 50lbs in the quantity.

If ordering through our website, be sure to select the correct shipping option. Customers may choose “Pick up at retail location” if they would like to pick up their order rather than have it shipped.


How much does shipping cost?

If your order is 200 pounds or more, we will ship it on a pallet. Shipping any quantity between 200 and 2400 pounds (the weight limit of one pallet) will be the same price. On average, pallets shipping within Southeast Michigan cost between $125 and $135 per pallet. This cost does not cover inside delivery. Shipping cost is subject to change. If you are ordering from further North or West, or out of state, contact Rovin for a shipping quote.

Rovin uses R&L Carriers for all freight shipments. You may schedule your delivery with Rovin when you place your order. In-state, Ohio, and Indiana have a 1-day transit.

Orders less than 200 pounds will be shipped via UPS Ground. Shipping costs for these orders vary significantly, contact Rovin for a quote. Lead time is between 1-5 business days.


How is my shipping cost calculated?

Our website works with UPS to calculate shipping based on weight of the objects ordered. Unfortunately, there is no way to predict the package size required as we carry thousands of products with widely varying dimensions. The website is also unable to predict how many packages it will be split into and assumes one order will be shipped in one package. Most of the time this doesn’t make a significant difference in cost, but occasionally the website will overestimate the shipping charge in check out. Main things that affect shipping cost is weight, package dimensions, and shipping location. In addition to this, Rovin’s annual volume of packages shipped through UPS determines our baseline rates. This is largely why we are not able to ship for free or as low of rates as big box companies like Amazon. Rest assured, if we ship your package and find you were overcharged for shipping, we will refund the difference asap.

How do I choose what clay to order?

Determine what temperature or cone you are able to fire to and consider what kinds of projects you or your students will be doing i.e., wheel throwing and/or hand-building. Then decide if you prefer a red or white clay, something coarse, smooth, or speckled etc.

Our most popular clay is the RO14 Light Stoneware because it can be used with low fire or high fire glazes, and is well suited for any type of project or skill level. This clay fires to a bright white at cone 05 and off white at cone 6.

Another great choice is the RO82M Terra Cotta with Fine Grog This is a red clay that can also be fired at both low and high temperatures. Great for throwing or hand-building, this clay has been a favorite of many artists, teachers, and students.

Other notable options for the classroom are the RO-14, RO-75, Standard Clay 105 White or 103 Red and RO-82.

Still not sure what clay is best for you? Call or email Rovin, tell us the few basic qualities you are looking for in your clay, and our experts will be happy to recommend some options. 


How much clay do I need?

Rovin clay may be ordered in 25lb increments, Standard & Laguna in 50lbs. A small hand-built project or cup/mug usually takes about 1-2 lbs.  For teachers, determine how many clay projects the students will do and how many students you have. You will likely need about 1.5lbs per student per project. By this measure, for one project, 1 box of clay will provide for around 16 students.

If you are an artist, hobbyist, etc., the same process applies; if you are throwing pots estimate how many pounds of clay you will use per pot and divide 25 or 50 by that number (Rovin box or Laguna/Standard box.) That will give you the number of portions per box. Be sure to allow for some scrap/extra clay.

EX: I want to make 12 3lb bowls. 25lbs / 3lb = 8.33 = roughly 7 or 8 bowls per bag if I don’t make any mistakes. I will buy 2 boxes or Rovin clay or 1 box of Laguna clay which will leave me about 4 extra 3lb balls in case I make mistakes.


The store is out of something I need, what is the lead time on out-of-stock items?

Depending on the vendor, the timeline can vary. For most of our suppliers it takes about one to two weeks to receive an order, but a few select items may take as long as 4 to 5 weeks to restock. We do our best to make sure we never run out of your favorite glazes, but sometimes sales can be unpredictable. We are more than happy to put your name and contact info on our backorder list so that we can contact you as soon as your desired items are back in stock.

The store doesn't regularly stock an item I want, can you order this for me?

The answer to this question is sometimes! Some items we don't have room for regularly in the store can be special ordered*. We can place it on our next bulk order from that particular vendor and contact you when it is in stock and available for pick up. Alternatively, we can have it drop shipped to directly to you; it would be shipped directly from the manufacturer to your address for a faster lead time. This method does require the purchaser to cover the drop shipping cost. This special order service is not available through every vendor/supplier we carry, but anything from Amaco or Laguna clay is available for special order services. *There are no cancellations on any/all special orders once the order is placed with the vendor/manufacturer.

Can I place a raw material order and pick it up on the same day the order is placed?

We're more than happy to get you the materials you need if you are in a rush! However, if you need your weighed out materials on the same day, there will be a $5.00 weigh out fee applied to each bag of material ordered. Please place your order 24 hours before your desired shipping or pick-up date to avoid the day-of-weigh out rush fee. Most of the raw materials we carry are available in 50-pound bags, so full bags can be picked up at any time without ordering in advance and no day-of-weight out rush fee.

My glaze recipe is in grams; can I place an order for raw material weigh outs using that unit of measurement?

Rovin's price breaks for both raw materials and clay are by the pound. We are not able to measure orders in grams, so you will have to calculate how much material your recipe calls for in pounds.

What is the difference between cone 5 and cone 05?

There is a common misconception that cone 05 and 5 are the same temperature. Cone 05 is actually much lower in temperature (1886 degrees F) than cone 5 (2167 F). Think about the ‘0’ as a negative number sign. from lowest temperature to highest temperature the cones would be 05, 04, 03, 02, 01, 1, 2, 3, 4, 5. See Cone Chart here for details on temperature. 


What is Bisque, Low-fire, Mid-fire, and High-fire?

A “bisque” firing is the first firing of greenware to a low temperature (typically between cone 06 and 04, 1830 to 1945 degrees Fahrenheit) to harden the clay just enough to apply glaze. This is done when clay pieces are bone dry.

Low-fire” is a glaze firing temperature ranging between cone 06 and cone 04 (yes this is the same temperature as most bisque firings) Typically between 1830- and 1945-degrees Fahrenheit. This is commonly used for earthenware or terra-cotta clays.

Mid-fire” is a glaze firing temperature between cone 5 and cone 6, between 2185 -2232 degrees Fahrenheit (though it can include cone 4 through cone 7.) This is the most popular glaze firing temperature for electric kilns. Clays typically fired at this temp include midrange porcelains and stonewares.

High Fire” is the highest glaze firing temp typically seen used in gas and atmospheric kilns though there are many electric kilns that are capable of this temperature range. High fire encompasses cone 8 through cone 12 though cones 9 and 10 are the most common “high-fire” cones from.

What is the difference between Glaze and Underglaze?

Underglaze is essentially a colored liquid clay and can go on both greenware and bisque-ware. They are usually predictable colors for mixing and is acts similarly to paint. Underglaze does not bleed or fuse like glazes do, therefore it is still porous. Underglazes are meant to go under glazes and usually does not react with the glazes on top. - Glazes generally only go on bisque-ware. It is unpredictable when mixed with other glazes. To get a more predictable outcome, it needs to be tested when layered with other glazes. Layered glazes will fuse togther, and depending on the thickness and make-up of the glaze, it can run. Because glaze is essentially glass, it is waterproof and can be used for functional-ware unless it isn't foodsafe - containing hazardous materials (i.e lead, lithium, barium or chrome). And for the sake of your kiln shelves, glazes should not be put on the bottom of ceramic pieces unless they're stilted.


What is Grog?

Grog is a raw material that can be added to clay bodies for increased strength and/or texture. Because grog is material that has already been fired and has been through most of their shrinking, It will reduce the degree of shrinkage that clay goes through during drying and firing. Also, grog creates a more porous clay composition that dries more evenly, so it helps prevent cracking. It is commonly used in clays for hand-building or sculpture, and often in large scale pieces to give added stability. Grog can also come in different mesh sizes. High grog content clays aren't always ideal for wheel-throwing and potters will usually prefer clay with little to no grog, or grog with a smaller mesh size.

There are multiple types of one raw material, which one is the right one for my clay/glaze recipe?

there are slight variations in each type of material, though they can be interchangeable in a recipe, they will cause slight changes in results. Consult resources like & and read about the chemical makeup of the different raw material variants ex types of ball clays. take it a step further and conduct some fusion button tests; fire a small amount of the raw materials on test tiles by themselves and compare the fired qualities: color texture, melt, etc. this will give some clues about how it will behave in your clay or glaze recipe.


Selecting Large Equipment| 

How do I choose my kiln?

First ask yourself this series of questions and with the answers, Rovin can help you narrow down the best model for you. 

  • How often will I fire my work?
  • How much work will I plan to make per week/month? (How much cubic feet of kiln will I need.)
  • What cone or temperature will I regularly be glaze firing to?
  • Do I have a budget?
  • Where will I install my kiln? Indoors? in a garage? basement? 

Consider these questions and refer to our Need-to-Know Evenheat Kiln Specifications PDF to help you research your various kiln options (see link below)! Each kiln is built to order, so it's important to consider these questions whilst looking at the options available as they can be key determining factors in which kiln model is best suited to your needs. Kiln Manual Need to Know info

Where can I safely install my new kiln?

Kilns can be installed in locations that have non-flammable flooring and an appropriate amount of space; 12" or more from all walls and 36" or more from all ceilings. The most commonly utilized residential spaces are garages and basements. These locations also must have the capabilities of being properly ventilated. We highly recommend reading the official Evenheat Kiln Manual for through instruction on choosing a location for your kiln.

How long does it take for my kiln to ship?

Since all Evenheat kiln models are made to order, lead times will vary due to material and part availability during the year. They can be anywhere from 10-12+ weeks on average. Please call or email Rovin staff to inquire about the most current lead times.