A Crafts Community For Craft Ideas & DIY Projects - Craftster.org
Help | About | Contact | Press | Advertise | Terms | Site Map
Welcome, Guest.
Please login or register.
Random Tip: Do you have a crafty tattoo?  We'd love to feature it in our Crafty Tattoos blog series!  Share it with us here!
Total Members: 296,707
Currently Running With Scissors:
714 Guests and 27 Users
Home Craftster Community Crafting Articles Craft Tutorials My Craftster Crafting Calendar City Guides Craft Shop


Pages: [1]
Jump to page:
  Show Images Only     Send this topic  |  Print  |  Bookmark  
Topic: help please with cooking times on projects using a mix of different clays...  (Read 509 times)
Tags for this thread:  Add new tag
Share the love... Pin it Submit to reddit add to Wists
1+
 
SooStark
« on: May 31, 2008 12:32:29 PM »

ok so i have fimo and premo sculpey and sculpey says to cook for 30 mins per quart of inch so if i had a project an inch thick this would take me two hours to cook and fimo says just to cook for 30 mins i cannot see anywhere that states about the thickness for cooking fimo just the specific cooking time of 30 mins and not to over cook it well im wondering then if i done a project that was using a mix of both of these clays what would i do about the cooking time, say if cooked a cake an inch high (the thickness) and was using both clays would i go with the sculpey instructions and cook for the two hours or the fimo instructions and cook for just 30 mins and risk undercookoing it, how do you come up with good cooking guidelines any help much appreciated
thankies
xxx
THIS ROCKS   Logged
Foisty
« Reply #1 on: May 31, 2008 03:00:26 PM »

Your post is a bit confusing but, make whatever you are making, take a moist paper towels put one on the bottom of your baking suface and on top of your object. When they dry out repaet the process. Ive done this and left things in the oven for a very long time with out them burning-it actually makes them stronger.
THIS ROCKS   Logged
Diane B.
Offline Offline

Posts: 5061
Joined: 01-May-2004

GlassAttic --polymer clay "encyclopedia"


View Profile WWW
« Reply #2 on: May 31, 2008 06:50:03 PM »

Baking temps can be quite problematic, especially these days since the new formulations of the Fimos have come out with their new recommended temp of 230 instead of 265.  Other clayers have found that it's okay to use the old temp though instead of the new one, especially if one is baking "carefully" (with an oven thermometer, not close to the coils or sides, on a good baking surface, etc.). 
However, there is a problem with the Sculpeys* even at their recommended temp (275) since they tend to darken very easily, compared to other brands baked at their recommended temps... Polyform doesn't really address this issue because they know the higher temp is really required for strength and they think that "crafters want to bake quickly." 
Using a partly-"enclosed" or a fully-enclosed baking method can keep even any of the Sulpeys from darkening though (one of which is to drape a damp paper towel over the object while curing, as mentioned above).

*
"the Sculpeys" are mostly Sculpey, SuperSculpey, and Sculpey III -- Premo isn't a "Sculpey" to most clayers because it is a quite different clay, and was created to the specifications of a clayer with the Polyform chemist simply carrying out her wishes

Baking times are also a bit weird. 
It used to be that all the polymer clays gave the 15-20 minutes per quarter-inch recommendation, but for much thicker items it really doesn't take as long as the math would suggest.  On the other hand, any polymer clay will get stronger than it normally would have with longer baking because the polymerization will continue and continue.  (Time and temp. are interdepent for thermosetting plastics like polymer clay, so the lower the temp the longer the baking required to achieve sufficient polymerization--there's even an equation for that relationship).

As for mixing clays, the general advice was always to decide on the temp based on the relative amounts of each brand used in a particular mix.  But it's actually better to bake them all at say 265-275 for as long as is possible without causing the mix to darken (which can be helped with the techniques mentioned above).  If you bake at a lower temp (230, e.g.) then you'll certainly need to bake non-Fimo clays longer to get a good amount of polymerization --which btw isn't just when the clay feels hard, because the outer portions of the clay will polymerize sooner than the interior will so you wouldn't have any way to know that the item hadn't polymerized well all the way to the center.

If you want much more info on all aspects of baking polymer clay, check out this page:
http://glassattic.com/polymer/baking.htm


Diane B.
« Last Edit: May 31, 2008 06:59:09 PM by Diane B. » THIS ROCKS   Logged

POLYMER CLAY "ENCYCLOPEDIA" 
http://glassattic.com/polymer/contents.htm
few of my photos
http://s96.photobucket.com/albums/l163/DianeBB
(had to move them from YahooPhotos, so many now without captions)
ilysa
« Reply #3 on: June 02, 2008 01:09:11 PM »

You do not have to cook it that long. I have been working with polymer clay for 19 years and mostly using Fimo. I have never baked anything more than 45 minutes no matter how thick it is and I have never had a problem. I did not feel that it was any more breakable either. I would fire the mixture of clays at the lower recommended temperature the other clay will be fine just fire it a little longer. Good luck!
Regards,

« Last Edit: March 02, 2012 03:42:23 PM by jungrrl » THIS ROCKS   Logged

SooStark
« Reply #4 on: June 03, 2008 08:17:42 AM »

thank you so much for the advice ive made a few bits with a mixture of the clays just scared to cook them now oh well guess tis trial and error but thanks so much for your advice it has helped me heaps
x
THIS ROCKS   Logged
Threads you might like:
Pages: [1] Jump to page:
  Send this topic  |  Print  |  Bookmark  
 
Jump to:  



only results with images
include swap threads
advanced search



your ad could be here!

How-To Videos
A Boudoir Photo Shoot Is The Sexy Gift That Keeps On Giving
Photography Tips: Take Only Photographs, Leave Only Footprints
Landscape and Nature Photography Tips
How to Read Your Camera Light Meter
Photography Tips: Using Fill Flash
Latest Blog Articles
Tute Tuesday: Art Pen Case
Sock It To Me!
Meatless Monday: Kale and Edamame Salad

Comparison Shopping




Support Craftster
Become a
Friend of Craftster

Buy Craftster Swag
Buy Craft Supplies
Comparison Shopping

Craftster heartily thanks the following peeps...
Moderators

Follow Craftster...






Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC
SimplePortal 2.3.5 © 2008-2012, SimplePortal
Valid XHTML 1.0! Valid CSS!

Copyright ©2003-2014, Craftster.org an Internet Brands company.