Tyco Electronics Corporation
Specification RT-1323
300 Constitutional Drive
This Issue: Issue 1
Menlo Park, CA 94025 USA
Date: August 5, 1986
Replaces: None
Thermofit Zerohal Polyolefin Molded Components
Halogen-Free, Flame Retarded, Semi-Flexible, Heat-Shrinkable
1. SCOPE
This specification covers the requirements for one type of semi-flexible electrical insulating molded
component whose dimensions will reduce to a predetermined size upon the application of heat in excess of
121C (250F).
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-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance
MIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5
MIL-L-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base
MIL-C-24643 Cable and Cord, Electrical, Low Smoke, for Shipboard Use, General Specification for
2.2 OTHER PUBLICATIONS
American Society for Testing and Materials (ASTM)
D 149 Standard Methods of Test 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 Test Method 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 882 Standard Test Methods for Tensile Properties of Thin Plastic Specimens
D 2671 Standard Methods of Testing Heat-Shrinkable Tubing for Electrical Use
D 2863 Standard Method for Measuring the Minimum Oxygen Concentration to Support Candle-
Like Combustion of Plastics (Oxygen Index)
D 3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus
E 662 Test Method for Specific Optical Density of Smoke Generated by Solid Materials
(Copies of ASTM publications may be obtained from the American Society for Testing and Materials, 1916
Race Street, Philadelphia, Pennsylvania 19103.)
If this document is printed it becomes uncontrolled. Check for the latest revision.
Page 2 SPECIFICATION RT-1323 ISSUE 1
3. REQUIREMENTS
3.1 MATERIAL
The molded components shall be fabricated from a crosslinked, halogen- free, thermally stabilized, flame-
retarded, modified polyolefin 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, unless otherwise specified.
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: dimensions, dimensional recovery, tensile strength,
ultimate elongation, secant modulus, specific gravity and dielectric strength.
4.2 SAMPLING INSTRUCTIONS
4.2.1 Qualification Test Samples
Qualification test samples shall consist of 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 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 150 2C (302 4F) oven or equivalent,
cooled to room temperature, and remeasured.
4.3.2 Tensile Strength and Ultimate Elongation
Three specimens cut from a molded slab using die D of ASTM D 412 shall be tested for tensile strength and
ultimate elongation in accordance with ASTM D 412.
4.3.3 Secant Modulus
Five specimens, 6 x 3/4 x 0.075 inches (150 x 19 x 1.9 mm) cut from a molded slab shall be tested for secant
modulus at two percent strain in accordance with ASTM D 882. Use an initial jaw separation of 4 inches
(100 mm) and a crosshead speed of 0.4 inches (10 mm) per minute.
If this document is printed it becomes uncontrolled. Check for the latest revision.