WHICH TYPES OF THE POLYMER CLAY IS THE STRONGEST?

THE TENSION, COMPRESSION AND FLEXIBILITY TESTS
ON ALL TYPES OF POLYMER CLAY

Temperature Setting 150ºC ( 302ºF ),
Maximum baking temperature for polymer clay 
Thickness of the clay approx. 4.0 mm diameter and
1.0 mm thick strip, baking time 30 minutes


All types of polymer clay, Kato, Fimo, Sculpey, Studio
and Cernit

Weighing Scale And Mild Steel Wires


A weighing scale polymer clay is stretched to measure 
the strengthen.


New Fimo Soft


Testing the new Fimo Soft approximately 4.0 mm diameter 
coiled for compression test. The tension test is done with a 
weighing scale, measuring the amount of force that will break 
a 4.0 mm diameter polymer clay and final test on a 1.0 mm 
thick for flexibility of the clay.


The tension test, it will take 14 pounds of force to break 
a 4.0 mm diameter New Fimo Soft polymer clay


At 1.0 mm bending it 140 times will not break the strip.


Compression test to the New Fimo Soft is firm and flexible. 
At 4.0 mm diameter, doesn't break after 8 compression 


Comparing the compression tests between the New Fimo 
Soft and Sculpey III, the latter is very brittle.


New Fimo Classic


Test results for the new Fimo Classic, compression test, it is 
very firm and flexible. At 4.0 mm diameter coiled, it doesn't 
break after 8 compression and final test on new Fimo Classic 
at 1.0  mm thick, bending it 140 times will not break the strip.


The tension test, it will take 18 pound of force to break 
a 4.0 mm diameter new Fimo Classic polymer clay


Sculpey III


Test results for the Sculpey III, compression test, it is very 
brittle, breaks at first compression and testing for flexibility 
at 1.0  mm thick, it will takes a single bend to break the strip.


The tension test, it will take 10 pounds of force to break 
a 4.0 mm diameter Sculpey III polymer clay


At 1.0 mm bending it single time, break the strips.


Premo Sculpey 


Test results for the Premo Sculpey, compression test, it is 
very flexible, doesn't break within 8 compression and
 testing for flexibility at 1.0  mm thick, bending it 140 
times will not break the strip.


The tension test, it will take 18 pound of force to break 
a 4.0 mm diameter Premo Sculpey polymer clay.


Sculpey Studio 


Test results for the Sculpey Studio, compression test, 
it is firm and flexible doesn't break within 8 compression 
and testing for flexibility at 1.0  mm thick, bending it 140 
times will not break the strip.


The tension test, it will take 21 pounds of force to break 
a 4.0 mm diameter Sculpey Studio polymer clay.


Super Sculpey 


Test results for the Super Sculpey, compression test, 
it is hard and brittle snap into two within a single 
compression and testing for flexibility at 1.0  mm thick, 
bending it 1 time will break the strip.


Baking Super Sculpey150º C for 30 minutes will changed 
the color of the clay to blackish brown. Even though the 
color is changed the clay remains firm and strong, painting, 
curving and drilling doesn't present a problem. If you do not 
like the dark color bake the clay within 130ºC - 140º C, 
monitor the baking with a oven thermometer.The tension 
will not be as strong as listed in my test.


The tension test, it will take 17 pounds of force to break 
a 4.0 mm diameter Super Sculpey polymer clay.


 Sculpey Firm


Test results for the Sculpey Firm, compression test, it is 
hard and brittle snap into two within a single compression 
and testing for flexibility at 1.0  mm thick, bending it 20 
times will break the strip.


The tension test, it will take 18 pounds of force to break a 
4.0 mm diameter Sculpey Firm polymer clay.


Kato Clay


Test results for the Kato Clay, compression test, it is hard 
and flexible doesn't break within 8 compression and 
testing for flexibility at 1.0  mm thick, bending it 102 
times will break the strip.


The tension test, at 25 pounds of force, doesn't break a 
4.0 mm diameter Kato polymer clay.


Cernit Clay 


Test results for the Cernit Clay, compression test, it is 
firm and flexible doesn't break within 8 compression
and testing for flexibility at 1.0  mm thick, bending it 
140 times doesn't break the strip.


The tension test, at  almost  maximum 25 pounds 
of force, doesn't break a 4.0 mm diameter Cernit 
polymer clay.


Multiple Tests Samples


Tests were conducted multiple times.



Baking For 30 Minutes In A Convection Oven With The Different Types Of Clay

Temperature Setting 150º C ( 302º F ), 4.0 mm diameter and 1.0 mm thick strip.



Tension Tests
4.0 mm diameter

Fimo soft
 Fimo Classic
Sculpey III 
Premo Sculpey
 Sculpey Studio
 Super Sculpey
 Sculpey Firm
 Kato Clay
 Cernit Clay
 
 14 lbs
 18 lbs
 10 lbs
 18 lbs
 21 lbs
 17 lbs
 18 lbs
  25 lbs
25 lb
 
                   

 

Changing Color
4.0 mm diameter and 1.0 mm strip

Fimo soft
 Fimo Classic
Sculpey III 
Premo Sculpey
 Sculpey Studio
 Super Sculpey
 Sculpey Firm
 Kato Clay
 Cernit Clay
 
No Change
No change
 No change
 Slightly Dark
No Change
 Blackish Brown
 No Change
  No 
Change
No Change
 
Minor blisters 1.0 mm thick
     
Slight blistering 1.0 mm thick
 
 Blisters on clay surface 1.0 mm thick
   

 

Compression Tests
4.0 mm diameter coil

Fimo soft
 Fimo Classic
Sculpey III 
Premo Sculpey
Sculpey Studio
 Super 
Sculpey
 Sculpey Firm
 Kato Clay
 Cernit Clay
 
 8X +
8X +
1X
 8X +
 8X +
1X
 1X
 8X +
8X +
 
Firm Flexible
Firm Flexible
 Brittle
 Soft Flexible
 Firm Flexible
Hard Brittle
Firm Brittle
Hard Flexible
Firm Flexible
 

 

Flexibility Tests
1.0mm thick strip

 Fimo soft
 Fimo Classic
 Sculpey III 
Premo Sculpey
 Sculpey Studio
 Super Sculpey
 Sculpey Firm
 Kato Clay
 Cernit Clay
 
Bending Above 140 X
Bending Above 140 X
Bending 1X
Bending Above 140 X
 Bending Above 140X
 Bending 1X
Bending 20X
Bending 102X
Bending Above 140 X
 
 Not Breaking
 Not Breaking
Break
 Not Breaking
 Not Breaking
 Break
 Break
 Break
  Not Breaking
 

 

Note: All polymer clay are properly condition to remove trap air etc., hard clays are conditioned
by using rubber mallet method.

05/03/2008


Conclusion

After the above tests, the contender is Cernit Polymer Clay, next Kato Polymer Clay, then Sculpey 
Studio, Fimo Classic, Sculpey Firm, Fimo Soft, Sculpey Premo, Super Sculpey and Sculpey III.
Cernit been the number one in my tests, is a good polymer clay, I liked the effects after baking but, 
people with high body heat will find it difficult to knead and control the shaping of the clay. Next, Kato 
is also a good clay when baked at 150º C it is very hard but, conditioning and kneading the clay 
can be tough, just like old formula Fimo Classic, use my rubber mallet method. Hard clay can be
soften beside baby oil, any oil and others, use sculpey elasticlay in a proportion of 10 : 1 for a 
2 oz. block 0r 3 oz block. Elasticlay will not affect or change the color of the polymer clay.
In these tests, the new formula for Fimo clays are much better than the older clay, although you can 
bake at 110º C best baking temperature should be 130º C to 140º C if you are baking for more 
than 30 minutes. During the testing, there are also color changes to some clay, the worst is Super 
Sculpey and a slight change of color to Sculpey Premo, these clays are best bake between 130º C 
to 140º C for 30 to 40 minutes but the strengthen will be affected slightly, you will also observed
 mooning in Super Sculpey. Use a oven thermometer to monitor the temperature, if it spike adjust 
the temperature control knob. Although Super Sculpey is strong in the tension test, it loose out, 
because of color changes, compression and flexibility tests. The last of the clay test is Sculpey III,
it is the favorite clay that kids loves to play with, unfortunately, it is not strong, it is very disappointing
to have the kid's hand works / projects broken into pieces. To resolve the problem, combine 
Sculpey III with Premo, Fimo, Cernit, superflex, although you can also combine Sculpey III with 
Sculpey Studio, the latter is a new clay and I will test my samples after 3 to 4 weeks to confirm 
whether it will retain its strengthen.

Test completed on 8th March 2008.

As from 27th March 2008, There is no deterioration to the Studio Sculpey

 

 

 

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