1. 1
Composite Manufacturing
Technical Information andTest Results
for FenFormTM
Silicone Sheet

2. Contents
FenFormTM
Typical Physical Properties 4
General Materials Properties 4
Recommended Curing Conditions 4
Packing Details 4
Cured Material Specification 5
Testing Method 7
Physical Properties after Cycle Conditioning 8
DOE Analysis:Tensile Strength 9
DOE Analysis: Elongation at Break 10
DOE Analysis: Modulus at 300% 11
Cycles to Failure 12
Summary of Results 13

3. Used in the manufacture of
composite materials

4. 4
FenFormTM
Typical Physical Properties
Standard thickness of 0.9mm to 3.5mm (0.35”to 1.38”).
Standard widths of up to 1500mm (59.06”).
Available both cured and uncured.
Cured material has a fine fabric impression to aid removal.
Standard colours of translucent and grey.
Standard 50 durometer, additional hardness grades
available on request.
General Materials Properties
(FenFormTM
50)
Working Temperature R.T.I. 1500C
Shelf Life (Uncured): 6 months from date of
manufacture when stored at
240C wrapped as supplied
Recommended Curing Conditions
Press cure for 5 minutes at 1160C with 200psi (1.MPa) of pressure.
Packing Details
Protected both sides with polythene film. Packed in cardboard
cartons supported on a central tube.

5. 5
Cured Material Specification
Property Test Method Units TypicalValues
FenFormTM
50
Hardness ASTM D2240 0Shore A 51
Density ASTM D2792 g/cm3 1.15
Tensile
Strength
ASTM D412
DIE C
MPa 10
Elongation at
Break
ASTM D412
DIE C
% 600
Tear Strength ASTM D624
DIE B
KN/m 33
Compression
Set
ASTM D395
22h @ 1770C
% < 45 (4 hours
@ 2000C)
Dielectric
Strength
Kv/mm 20
Thermal
Expansion
m/m0C 6.5
Colours Grey &
Translucent

6. 6
FenFormTM
silicone
membranes are the flexible
choice for your composites
manufacture

7. 7
Testing Method
Fenner Precision owns a well-equipped on-site testing laboratory,
which includes a Tensometer equipped with an environmental
chamber.
DOE (Design of Experiments) was carried out on FenFormTM
and a
competitor’s equivalent product.
The factors investigated were:
Temperature
Extension
Number of cycles

8. 8
Physical Properties after Cycle Conditioning
FenFormTM
Competitor’s Material
Temperature
(0C)
Cycles Tensile
Strength
Elongation
At Break
Modulus at Elongation
%
100% 200% 300%
20 50 7.87 814 0.877 1.875 2.662
100 5.2075 542.7 0.9045 1.9275 2.7845
200 2.9075 329.45 0.8625 1.834 2.6425
20 150 7.41 786 0.845 1.859 2.658
100 5.1555 558.5 0.849 1.883 2.725
200 3.299 351.4 0.866 1.897 2.823
Temperature
(0C)
Cycles Tensile
Strength
Elongation
At Break
Modulus at Elongation
%
100% 200% 300%
20 50 7.37 933 0.713 1.506 2.137
100 3.955 697 0.715 1.537 2.182
200 2.508 374 0.78 1.613 1.777
20 150 7.29 926 0.683 1.498 2.14
100 3.984 679 0.705 1.559 2.217
200 2.95 414 0.726 1.559 2.221

9. 9
DOE Analysis: Tensile Strength

10. 10
DOE Analysis: Elongation at Break

11. 11
DOE Analysis: Modulus at 300%

12. 12
Cycles to Failure
Material samples were cycled under controlled conditions until
failure.
Sample Temperature
0C
Extension
%
Sample
Thickness
(mm)
Average
Number of
Cycles to
Break
FenFormTM
200 300 2.145 104
Competitor’s
Material
200 300 2.32 77.5
When FenFormTM
was cycled at extreme conditions (to give a
manageable testing time), it lasted an average of 25% longer than
the competitor’s product.

13. 13
Summary of Results
FenForm’sTM
Tensile Strength is higher than the
competition’s. The difference is maintained as the
temperature and cycles are increased.
The difference between the Elongation at Break of
FenFormTM
and the competitor’s material decreases at
higher temperatures.
The Modulus figure at a given elongation is higher for
FenFormTM
than the competitor’s material. The figure
is more consistent as the temperature and cycles are
increased.
FenFormTM
gives 25% more cycles than the competition
when tested at the same temperature and with the same
elongation conditions.
FenFormTM
is a stronger material that gives a more
consistent performance at operating temperature from
first cycle to last.

14. 14
When quality is paramount,
FenFormTM
is the most
reliable choice

15. Reusable FenFormTM
silicone sheet
outperforms the competition round
after round
FenFormTM
:
the
Heavyweight
Champion
for Composites
Manufacture

16. For more information, contact:
Fenner Precision
info@fennerprecision.com
Tel: +44 (0)1522 551010
Fax: +44 (0)1522 511252
www.fennerprecision.com
ISO 9001 2008
Made in England