Techniques for Curing Polymer Clay
How to Cure Polymer Clay
No subject in polymer clay has more controversy than how to best cure polymer clay. This lens gives an over view of the main techniques used along with their pros and cons to help you make a decision on how to best cure your polymer clay creations.
Safety and Polymer Clay
Regardless of what method you use practice proper safety precautions. Never use tools or dishes for food after using them for polymer clay and be careful handling hot items.
Clean your oven thoroughly after baking polymer clay if it dedicated to polymer clay use or if clay wasn't baked in a sealed container like a roasting bag.
- Polymer Clay Cyclopedia- Polymer Clay Safety
An excellent treatise on the safety concerns of using polymer clay.
- Artrepreneur; The Collision of Art and Business: Fear and Hysteria in the Studio
Nearly every time I do a show, I have someone come up to me and ask me if I know about how dangerous polymer clay is. What is interesting about these encounters is that there is very little fact presented, just fear, and a sense that if I do not take
- Polymer Clay FAQ | Safety & Cleanup
How to work safely with polymer clay.
- ACMI (Art & Creative Materials Institute, Inc.)
The Art & Creative Materials Institute, Inc. (ACMI) is an international association, composed of a diverse and involved membership, and is recognized as the leading authority on art and creative materials. Founded in 1936, ACMI was organized to a
What the makers of polymer clay brands recommend.
- Super Sculpey should be cured in a preheated 275Â° F (130Â° C) oven for 15 minutes per quarter inch of thickness. DO NOT MICROWAVE. For example, a piece of Â½" thickness would be cured for 30 minutes. The layering method is recommended for lager pieces of construction.
- Premo! Sculpey should be cured at 275Â° F (130Â° C) in a preheated oven for 30 minutes per quarter inch of thickness. DO NOT MICROWAVE. Once cured, the colors intensify and deepen.
- Sculpey III should be cured in a preheated 275Â° F (130Â° C) oven for 15 minutes per quarter inch of thickness. DO NOT MICROWAVE. If you're unsure whether your piece is adequately cured, try pressing the tip of a fingernail into the bottom of your piece after it has cooled; it will leave a mark but will not actually enter the clay.
- Any home oven is suitable for hardening FIMO. Preheat the oven at 110Â°C/230Â°F. Place the FIMO model on an aluminum sheet, and plate or glass sheet and put it in the oven. Depending on the size of the model and the thickness of the walls, the hardening process takes approx. 20-30 minutes. FIMO reaches maximum hardness when completely cool.
- Cured at 275Â° F (130Â° C), this clay can be used in a household oven. For every 1/4 inch of thickness, it should be cured for 10 minutes.
- Kato Polyclay, oven hardening polymer clay, bakes at 300Â° F (150Â° C). However, it can also be cured at 275Â° F (135Â° C) with good results and has been approved to cure at 350Â° F by our toxicologist, however caution should be taken when curing at that temperature, time should be limited to 10 minutes as you will run the risk of discoloration. You should never exceed 365Â° F. In prior laboratory testing, it has been determined that tensile strength increases
- Sculpey - Projects and Products using Sculpey Polymer Clays!
Official site for Super Sculpey, Premo, and other Polyform polymer clays.
- EBERHARD FABER FIMO
EBERHARD FABER official site.
- Kato Polyclay
Kato Polyclay, The Ultimate Polymer Oven-Hardening Clay Donna Kato, well known polymer clay author, teacher, product developer, and artist, has worked in the medium for many years.
- Jack Johnston Art Dolls, Doll Seminars, Supplies
Jack Johnston offering Dolls including OOAK dolls, OOAK art dolls, one of a kind dolls, one of a kind art dolls, and doll sculpting.
Before Baking Any Polymer Clay
Oven temperature dials are notoriously inaccurate. Before you bake any polymer clay you should first find out how hot your oven gets. Set your oven to 275 Â°F (or whatever temperature your clay needs at it's max point), let it fully preheat for at least 20 minutes, then use a simple oven thermometer (available at any grocery or housewares store) to see where it is at. You can then adjust your oven to find exactly the point on your dial where the correct temperature is.
Ramp baking is a technique for gradually baking polymer clay to achieve a hard but minimally darkened result.
Starting at a low temperature of around 175-200Â° F bake for 30 minutes, increase the temperature by 15-30Â° and bake for 20 minutes, continue increasing the temperature by 15-30Â° and baking for 20 minutes after each increase until the temperature reaches the manufacturer recommended temperature. Bake at the recommended temperature for 30 minutes. Allow the piece to cool completely in the oven before moving.
This method requires careful monitoring to make sure the piece doesn't start darkening excessively. Some oven temperatures can spike significantly, always use a separate oven thermometer to monitor temperature.
Under baking is a technique used to try to prevent the darkening that some clays experience. It involves baking under the recommended temperature, usually at around 200Â° F, for an extended period of time often 1-3 hours depending on the thickness of the clay.
The main risk of under baking is a polymer clay piece which is weak or degrades over time due to the clay not being fully cured.
Over baking is a form of ramp baking used by some sculptors like Casey Love usually with super sculpey to get a very hard result with no cracks. Because the technique causes significant darkening of the clay it's used for sculptures that are to be molded for casting or painted.
Start at 225 and leave the sculpt for an hour, raise the temp to 250 for another hour, raise the temp again to 275 for 2- 3 hours or until the Super Sculpey has truned a dark caramel or even as dark as a redish brown brick color. Shut off the oven and leave the sculpt to completely cool down before removing the sculpture. If you are baking a rather thick sculpture use the same method above but raise the temperature slower and in smaller incraments.
The main risk of over baking is potential emission of small amounts of hydrochloric acid gas which can irritate the eyes, throat, and lungs. Burning can also occur.
Toaster Oven - This is the model I use and it's great!
This toaster oven has a 15 minute timer. I've found that for beads and pendants that two cycles of the timer (30 minutes) is just about perfect. It has a constant bake setting too but I like using the timer because it automatically shuts the oven off. It's size is best for small objects (6 inches or less) if you routinely make large pieces you'll want to get a larger model.
Using a Heat Gun
Heat guns can be used to cure small polymer clay pieces or to partially cure a sculpture to harden an area to protect it from damage while working on the rest of the sculpture. Heat guns are not suitable for completely curing large polymer clay pieces.
To use a heat gun turn it on either a low setting or if it has a dial set it as close to 275 degrees as you can. Aim the heat gun at the piece and keep constantly moving to prevent burning. Watch for the surface to go dull and darken slightly to determine if the clay has cured.
Heat guns take practice to effectively be used for polymer clay and they are the most unreliable of all curing techniques. Burning, bubbling, and blistering of the clay can occur if care isn't taken. Practice on scrap clay first to get the technique down. Always use a heat gun in a well ventilated area.
Boiling Polymer Clay
Gently boil small polymer clay pieces such as beads either in the microwave or on a stove top for at least 15 minutes and up to 1 hour. You must completely cover the clay with water or you risk over heating and other problems.
There is some debate about whether boiling completely cures polymer clay especially for items larger than beads.
What's your preffered method of curing polymer clay?
Links about Curing Polymer Clay
- BAKING Polymer Clay at GlassAttic
Numerous tips and techniques covered for curing polymer clay.
- The polymer clay :How to Use Microwave Oven To Harden Polymer Clay
Art and polymer clay shop in Singapore, retail a wide varieties of clay, tools, accessories, books and educational toys
- Polymer clay - Wikipedia, the free encyclopedia
Polymer clay From Wikipedia, the free encyclopedia
- Polymer Clay Cyclopedia- Baking Tips
This is an ever growing INTERACTIVE collection of tips and information directed at the Polymer Clay Beginner, compiled by all the friends and members of Polymer Clay Central.
- Polymer Clay Project Tutorials - Â» Firing a Standing Polymer Clay Doll
Firing a Standing Polymer Clay Doll - By: Jenna Zadymov *Note* This technique does work well for curing a standing sculpture but it's no substitute for a strong armature.
- Polymer Clay Beads by tooaquarius Â» DIY Clay Tools
How to make a baking rack for polymer clay beads.
Miscellaneous Curing Tips
Here are a few helpful hints for baking polymer clay using any of the baking methods.
- To reduce temperature spikes in toaster ovens lay small ceramic tiles or pieces of broken ceramic such as from a terracotta flower pot in the bottom of the oven. The pieces of ceramic absorb and then radiate heat helping to keep the temperature even.
- If you have to use a kitchen oven for curign your clay, encase it using a covered baking dish or roasting bag to reduce any build up of residue on your oven walls.
- Lay polymer clay pieces on polyfil batting to cushion pieces so the bottom does not get flattened shiny spots.
- For sculptures with areas of thin and thick clay protect the thinner areas from darkening more than the thick areas by covering them with aluminum foil.