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©2005 Tyco Electronics Corporation. All rights reserved
Tyco Electronics Corporation
300 Constitution Drive
Menlo Park, CA 94025 USA
Specification
This Issue:
Date:
Replaces:
RT-1312
Issue 4
January 17, 2005
Issue 3
RAYCHEM FLUORO ELASTOMER MOLDED COMPONENTS
Flame-Retarded, Flexible, Heat-Shrinkable
1. SCOPE
This specification covers the requirements for one type of flexible, electrical insulating molded component
whose expanded dimensions will reduce to a predetermined size upon the application of heat in excess of
175°C (347°F).
2. APPLICABLE DOCUMENTS
This specification takes precedence over documents referenced herein. Unless otherwise specified, the latest
issue of referenced documents applies. The following documents form a part of this specification to the
extent specified herein.
2.1 GOVERNMENT-FURNISHED DOCUMENTS
Military
MIL-G-5572 Gasoline, Aviation, Grades 80/87, 100/130, 115/145
MIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance
MIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base
MIL-T-5624 Turbine Fuel, Aviation, Grades JP-4, JP-5 and JP5/JP8.
2.2 OTHER PUBLICATIONS
American Society for Testing and Materials (ASTM)
D 149 Standard Methods of Tests for Dielectric Breakdown Voltage and Dielectric Strength of
Electrical Insulating Materials at Commercial Power Frequencies
D 257 Standard Methods of Test for D-C Resistance or Conductance of Insulating Materials
D 412 Standard Method of Tests for Rubber Properties in Tension
D 570 Standard Methods of Test for Water Absorption of Plastics
D 635 Standard Methods of Test for Rate of Burning and/or Extent and Time of Burning of Self-
Supporting Plastics in a Horizontal Position
D 792 Standard Methods of Test for Specific Gravity and Density of Plastics by Displacement
D 2240 Standard Method of Tests for Rubber Property-Durometer Hardness
D 2671 Standard Methods of Testing Heat Shrinkable Tubing for Electrical Use
G 21 Recommended Practice for Determining Resistance of Synthetic Polymeric Materials to
Fungi
(Copies of ASTM Publications may be obtained form the American Society for Testing and Materials, 1916
Race Street, Philadelphia, Pennsylvania 19103.)
Page 2 SPECIFICATION RT-1312 ISSUE 4
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3. REQUIREMENTS
3.1 MATERIAL
The molded components shall be fabricated from a crosslinked, thermally stabilized, flame-retarded,
modified fluoroelastomeric composition. They shall be homogeneous and essentially free from flaws,
defects, pinholes, bubbles, seams, cracks, and inclusions.
3.2 COLOR
The molded components shall be black.
3.3 PROPERTIES
The molded components and the material from which they are fabricated shall meet the requirements of
Table 1.
4. QUALITY ASSURANCE PROVISIONS
4.1 CLASSIFICATION OF TESTS
4.1.1 Qualification Tests
Qualification tests are those performed on molded slabs and components submitted for qualification as
satisfactory products and shall consist of all tests listed in this specification.
4.1.2 Acceptance Tests
Acceptance tests are those performed on molded slabs and components submitted for acceptance under
contract. Acceptance tests shall consist of the following:
Dimensional Recovery
Tensile Strength
Ultimate Elongation
Heat Shock
Hardness
Flammability
SPECIFICATION RT-1312 ISSUE 4 Page 3
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4.2 SAMPLING INSTRUCTIONS
4.2.1 Qualification Test Samples
Qualification test samples shall consist of six molded slabs, 6 x 6 x 0.075 ± 0.010 inches
(152 x 152 x 1.9 ± .25 mm) and the number of molded components specified. The molded slabs shall be
fabricated from the same lot of material and shall be subjected to the same degree of crosslinking as the
molded components.
4.2.2 Acceptance Test Samples
Acceptance test samples shall consist of specimens cut from a molded slab 6 x 6 x 0.075 ± 0.010 inches
(152 x 152 x 1.9 ± .25 mm), and molded components selected at random. The molded slab shall be fabricated
from the same lot of material and shall be subjected to the same degree of crosslinking as the molded
components. A lot of components shall consist of all molded components from the same lot of material, from
the same production run, and offered for inspection at the same time.
4.3 TEST PROCEDURES
4.3.1 Dimensions and Dimensional Recovery
Samples of molded components, as supplied, shall be measured for dimensions in accordance with ASTM D
2671. The samples then shall be conditioned for 10 minutes in a 200 ± 3°C (392 ± 5°F) oven, or equivalent,
cooled to room temperature and re-measured.
4.3.2 Elastic Memory
A 6 x 1/8-inch (152 x 3.2-mm) specimen cut from a molded slab shall be marked with two parallel gauge
lines 1 inch (25 mm) apart in the central portion of the specimen. The distance between gauge lines shall be
recorded as the original length. A 2-inch (51-mm) portion of the specimen including both gauge lines then
shall be heated for 1 minute in a 200 ± 2°C (392 ± 4°F) oven, or equivalent, removed from the oven and
stretched within 10 seconds, until the gauge lines are 4 inches (102 mm) apart. The extended specimen shall
be cooled to room temperature and released from tension. After 24 hours at room temperature, the distance
between the gauge lines shall be measured and recorded as the extended length. The portion of the specimen
including both gauge lines then shall be reheated for 1 minute in a 200 ± 2°C (392 ± 4°F) oven, or
equivalent, and the distance between gauge lines then shall be measured and recorded as the retracted length.
Expansion and retraction shall be calculated as follows:
E = Le - Lo
Lo x 100
R = Le - Lr
Le - Lo x 100
Page 4 SPECIFICATION RT-1312 ISSUE 4
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Where: E = Expansion (percent)
R = Retraction (percent)
L
o = Original Length [inches (mm)]
L
e = Extended Length [inches (mm)]
L
r = Retracted Length [inches (mm)]
4.3.3 Tensile Strength, Tensile Stress and Ultimate Elongation
Three specimens cut from a molded slab using Die D of ASTM D 412 shall be tested for tensile strength,
tensile stress and ultimate elongation in accordance with ASTM D 412.
4.3.4 Low Temperature Flexibility
Three 6 x 1/4-inch (152 x 6.3-mm) specimens cut from a molded slab shall be conditioned, along with a
1.125-inch (28.6 mm) mandrel, in a cold chamber at -55 ± 2°C (-67 ± 4°F) for 4 hours. After completion of
the conditioning, and while still in the cold chamber, each specimen shall be bent around the mandrel through
not less than 360 degrees within 10 ± 2 seconds. The specimens then shall be visually examined for cracks.
4.3.5 Heat Shock
Three 6 x 1/4-inch (152 x 6.3-mm) specimens cut from a molded slab shall be conditioned for 4 hours in a
300 ± 5°C (572 ± 9°F) mechanical convection oven with an air velocity of from 100 to 200 feet per minute
past the specimens. After conditioning, the specimens shall be removed from the oven, cooled to room
temperature, and bent through 360 degrees over a 3/8-inch (9.5-mm) diameter mandrel. The specimens then
shall be visually examined for evidence of dripping, flowing or cracking.
4.3.6 Heat Aging
Three specimens, prepared and measured in accordance with 4.3.3 shall be conditioned for 168 hours in a
250 ± 3°C (482 ± 5°F) mechanical convection oven with an air velocity of 100 to 200 feet per minute past
the specimens. After conditioning, the specimens shall be removed from the oven, cooled to room
temperature, and tested for tensile strength and ultimate elongation in accordance with 4.3.3.
4.3.7 Corrosive Effect
Three 1 x 1/4-inch (25.4 x 6.3-mm) specimens cut from a molded slab shall be tested for corrosive effect in
accordance with ASTM D 2671, Procedure A. The specimens shall be conditioned for 16 hours at 160 ± 3°C
(320 ± 5°F).
4.3.8 Fluid Resistance
Three specimens prepared and measured in accordance with 4.3.3 shall be completely immersed in the test
fluids listed in Table 1 for 24 hours at the specified temperatures. The volume of the fluid shall be not less
than 20 times that of the specimens. After conditioning, the specimens shall be lightly wiped and then air-
dried for 30 to 60 minutes at room temperature. The specimens then shall be tested for tensile strength and
ultimate elongation in accordance with 4.3.3.
SPECIFICATION RT-1312 ISSUE 4 Page 5
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4.3.9 Flammability
Prepare the specimen for the horizontal burn test in accordance with ASTM D 635. Report results in
accordance with ASTM D 635. Additionally, if the flame front fails to reach the 25mm mark, record the
average total time to self-extinguish the flame and glow of the specimen [ (tn-30)/number of specimens] and
the average total distance charred by the flame, measured from the 100 mm mark on the specimen,
subtracting the measurement from 100 to get the resulting burned length. A passing result is automatically
achieved when the flame self extinguishes prior to reaching the 25mm mark.
4.4 REJECTION AND RETEST
Failure of any sample to comply with any one of the requirements of this specification shall be cau se for
rejection of the lot represented. Material which has been rejected may be replaced or reworked to correct the
defect and then resubmitted for acceptance. Before resubmitting, full particulars concerning the rejection and
the action taken to co rrect the defect shall be furnished to the inspector.
5. PREPARATION FOR DELIVERY
5.1 PACKAGING
Packaging of molded components shall be in accordance with good commercial practice. The shipping
container shall be not less than 125 pound test fiberboard.
5.2 MARKING
Each molded component shall be distinctly identified on the part and/or package with the manufacturing
name or symbol, the manufacturer's part number, lot number, date of manufacture, and use before date.
Page 6 SPECIFICATION RT-1312 ISSUE 4
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TABLE 1
Requirement
PROPERTY UNIT REQUIREMENTS TEST METHOD
PHYSICAL
Dimensions
Inches (mm)
In accordance with applicable
specification control drawing
Section 4.3.1
ASTM D 2671
Dimensional Recovery Inches (mm) In accordance with applicable
specification control drawing
Elastic Memory Percent 200 minimum expansion 90
minimum ret raction Section 4.3.2
Tensile Strength psi (MPa) 1800 minimum (12.4) Section 4.3.3
Tensile Stress at 100% elongation psi (MPa) 1200 (8.3) maximum ASTM D 412
Ultimate Elongation Percent 300 minimum
Specific Gravity --- 1.95 maximum ASTM D 792
Hardness Shore A 85 ± 5 ASTM D 2240
Low Temperature Flexibility
4 hours at -55°C (-67°F) --- No cracking Section 4.3.4
Heat Shock
4 hours at 300°C (572°F) --- No dripping, flowing or cracking Section 4.3.5
Heat Aging
168 hours at 250°C (482°F)
Followed by tests for:
--- --- Section 4.3.6
Tensile Strength psi (MPa) 1200 minimum (8.3) Section 4.3.3
Elongation Percent 250 minimum
ELECTRICAL
Dielectric Strength
Volts/mil
(kV/mm)
200 (3.1) minimum
ASTM D 149
Volume Resistivity ohm-cm 1010 minimum ASTM D 257
CHEMICAL
Corrosive Effect
16 hours at 160°C (320°F)
---
Non-corrosive Section 4.3.7
ASTM D 2671
Procedure A
Flammability
Average Time of Burning and Glowing
Seconds
60 max imum ASTM D 635, and
Section 4.3.9
Average Extent of Burning Inches (mm) 1.0 (25.4) maximum
Fungus Resistance --- Rating of 1 or less ASTM G 21
Water Absorption
24 hours at 23°C (73°F) Percent 0.5 maximum ASTM D 570
Fluid Resistance
24 hours at 23°C (73°F)
Aviation Gasoline 100/300
(MIL-G-5572)
JP-8 Fuel (MIL-T-5624)
--- --- Section 4.3.8
24 hours at 93°C (200°F)
Lubricating Oil (MIL-L-7808)
Hydraulic Fluid (MIL-H-5606)
Water
Followed by tests for:
Tensile Strength psi (MPa) 1600 minimum (11.0) Section 4.3.3
Elongation Percent 200 minimum
