COMMERCIAL ITEM DESCRIPTION
RUBBER, SILICONE*

*This CID is an extract from Military Specifications.

The General Service Administration has authorized the use of this commercial item description for all federal agencies.

1. SCOPE

This commercial item description (CID) covers six classes of silicone rubber, in various grades.

2. CLASSIFICATION

The silicone rubber shall be of the following classes and grades, as specified:
Class 1A – Low temperature resistant.
Grades – 40, 50, 60, 70, 80
Class 1B – Low temperature resistant and low compression set at high temperature.
Grades – 40, 50, 60, 70, 80
Class 2A – High temperature resistant.
Grades – 25, 40, 50, 60, 70, 80
Class 2B – High temperature resistant and low compression set.
Grades – 25, 40, 50, 60, 70, 80
Class 3A – Low temperature, tear and flex resistant.
Grades – 30, 50, 60
Class 3B – Tear and flex resistant.
Grades – 30, 50, 60, 70, 80

3. SALIENT CHARACTERISTICS

3.1 Materials and composition. The material shall be silicone rubber, formulated and processed to meet the performance of this CID.
3.2 Physical and mechanical properties. Unless otherwise specified, the silicone rubber shall meet the physical and mechanical properties specified in table I when tested in accordance with the standards in table I. Proof of compliance may be required (see 5.1.1).
3.3 Form. The silicone rubber shall be in the form of sheets, strips or tape; extruded shapes or tubing; or molded shapes, as specified in the contract or purchase order (see 7.2).
3.4 Dimensions and tolerances. Dimensions and tolerances shall be as indicated in the contract or purchase order (see 7.2). If no tolerances are specified, A-3 commercial tolerances of the Rubber Manufacturer’s Association (RMA) Rubber Handbook shall apply for molded solid rubber products, as shown in table II, and the commercial tolerances of the RMA Rubber Sheet Packing Handbook shall apply for packing, as shown in table III. Commercial tolerances, as shown in tables IV, V, and VI shall be applied for extruded shapes, extruded tubing and calendared sheet, respectively. Dimensions and tolerances for o-rings shall be as specified in SAE-AS568 (see A-A-55801 for standard part numbers), or in accordance with the applicable part number for non-standard sizes.
3.5 Extruded tubing. Unless otherwise specified in the contract or purchase order (see 7.2), the length of extruded tubing shall be furnished in coils containing 100(30.48), 200(60.96), 500(152.4), or 1000(304.8) feet(m) per coil. Each coil shall contain not more than three individual lengths of tubing per 100 feet (30.48 m). No individual length of tubing shall be less than 15 feet (4.57 m).
3.6 Color. Unless otherwise specified (see 7.2), the color of the silicone rubber shall be the natural color of the compound furnished.
3.7 Marking. Unless otherwise specified (see 7.2), sheet material and strips (cut from sheet) shall be marked with the following information: CID number, class and grade designation, and the supplier’s designations. The class and grade designations, separated by a dash, shall be enclosed within parentheses. The markings shall be legible and placed in rows of constantly recurring symbols from one end of the sheet to the other, spaced approximately 5 inches (127 mm) apart. The supplier’s designation shall appear immediately below the constantly recurring CID symbols. The symbols shall be legible, and shall not be less than 3/8 inch (9.525 mm) high. Symbols shall be marked using white colored marking fluid for other than white silicones, and black colored marking fluid for white colored silicones. The markings shall not be obliterated by normal handling or by the action of petroleum-base oils.
3.8 Workmanship. The end product shall be clean, smooth finished, free from dirt, flash or rough edges, to the extent permitted by the acceptable quality levels in section 5.

4. REGULATORY REQUIREMENTS

4.1 Health, safety, and environment. The rubber products shall adhere to all federal, state, and local health, safety, and environmental regulations. No environmentally prohibited material or components shall be used in manufacturing, finishing, or packaging of the products.
4.2 Recycled materials. The supplier or contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR).

5. PRODUCT CONFORMANCE PROVISIONS

5.1 Product conformance. The products provided shall meet the salient characteristics of this commercial item description, conform to the producer’s own drawings, specifications, standards, and quality assurance practices, and are the same products offered for sale in the commercial market. The Government reserves the right to require proof of such conformance.
5.1.1 Test data. The supplier or contractor shall provide test data or lab results, of meeting the salient characteristics and special requirements, when specified by the procuring activity in the contract or purchase order (see 7.2).
5.1.2 Warranty. The supplier or contractor shall provide a warranty of replacing defective items as a special requirement (see 7.2), when specified by the procuring activity in the contract or purchase order.

6. PACKAGING

Preservation, packing, and marking shall be as specified in the contract or order (see 7.2). When no special packaging requirements are specified, ASTM D 3951 packaging guidance applies.

7. NOTES

7.1 Source of documents.
7.1.1 ASTM Standards are available from the American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or http://www.astm.org
7.1.2 SAE Standards are available from the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or http://www.sae.org
7.1.3 RMA Specifications are available from the Rubber Manufacturers Association, 1400 K Street, NW, Suite 900, Washington, DC 20005 or http://www.rma.org
7.1.4 FAR. The FAR may be obtained from the Regulatory Secretariat, 1800 F Street NW, Washington DC 20405 or online at http://www.acqnet.gov.
A-A-59588B

7.2 Ordering data.
The contract or order should specify the following:
a. CID document number, revision, and CID PIN.
b. Product conformance provisions.
c. Form, with dimensions, required (see 3.3).
d. Dimensions and tolerances (see 3.4).
e. Extruded tubing requirements (see 3.5).
f. Color required, if other than natural color of compound furnished (see 3.6)
g. Special marking requirements (see 3.7 and 6).
h. Test data requirements (see 5.1.1).
i. Warranty requirements (see 5.1.2).
j. Packaging requirements (see 6).

7.3 Cross reference data. Table VII lists converted ZZ-R-765 slash sheet CIDs and their titles numerically by shape to allow cross reference to the slash sheets. The shape numbers that appear in the CID titles correspond directly to the former slash sheet numbers for ZZ-R-765 (e.g., ZZ-R-765/10, corresponds to CID A-A-55754, Rubber Silicone, Round Section, Shape 10 in table VII).

TABLE VII. Commercial item descriptions that replaced former ZZ-R-765 slash sheets, (see 7.3)
A-A-55450Rubber, Silicone; Channel, Nonmetallic, Shape 1A-A-55761Rubber, Silicone; Strip, Shape 17
A-A-55449Rubber, Silicone; Channel, Nonmetallic, Shape 2A-A-55762Rubber, Silicone; Strip Shape 18
A-A-55451Rubber, Silicone; Channel, Nonmetallic, Shape 3A-A-55763Rubber, Silicon; Nonmetallic, Special Shaped Section, Shape 19
A-A-55452Rubber, Silicone; Channel, Nonmetallic, Shape 4A-A-55764Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 20
A-A-55749Rubber, Silicone; Channel, Nonmetallic, Shape 5A-A-55765Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 21
A-A-55750Rubber, Silicone; Nonmetallic, Shape 6A-A-55766Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 22
A-A-55751Rubber, Silicone; Channel, Nonmetallic, Shape 7A-A-55767Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 23
A-A-55752Rubber, Silicone; Channel, Nonmetallic, Shape 8A-A-55768Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 24
A-A-55753Rubber, Silicone; Tubing, Nonmetallic, Round, Flexible, Shape 9A-A-55769Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 25
A-A-55754Rubber, Silicone; Round Section, Shape 10A-A-55770Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 26
A-A-55755Rubber, Silicone; Packing Material, Shape 11A-A-55771Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 27
A-A-55756Rubber, Silicone; Packing Material, Shape 12A-A-55772Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 28
A-A-55757Rubber, Silicone; Gasket, Shape 13A-A-55773Rubber, Silicone; Nonmetallic, Special Shaped Section, Shape 29
A-A-55758Rubber, Silicone; Gasket, Shape 14A-A-55774Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 30
A-A-55759Rubber, Silicone; Rubber Sheet Solid, Shape 15A-A-55775Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 31
A-A-55760Rubber, Silicone; Strip Shape 16A-A-55776Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 32
A-A-55777Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 33A-A-55790Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 46
A-A-55778Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 34A-A-55791Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 47
A-A-55779Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 35A-A-55802Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 48
A-A-55780Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 36A-A-55792Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 49
A-A-55781Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 37A-A-55793Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 50
A-A-55782Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 38A-A-55794Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 51
A-A-55783Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 39A-A-55795Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 52
A-A-55784Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 40A-A-55796Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 53
A-A-55785Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 41A-A-55797Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 54
A-A-55786Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 42A-A-55798Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 55
A-A-55787Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 43A-A-55799Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 56
A-A-55788Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 44A-A-55800Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 57
A-A-55789Rubber, Silicone; Nonmetallic Special Shaped Section, Shape 45A-A-55801Rubber, Silicone; Packing Preformed, Shape 58

7.4 Intended use. The silicone rubber covered by this specification is intended generally for use under the conditions listed below. Users should, however, consider all the requirements of this specification when selecting a class and grade of silicone rubber.

Class 1 – Where resistance to extreme low temperature is required to approximately -73ºC (-100ºF). Class 1 material also possesses resistance to extreme high temperature (to approximately 219ºC (425ºF)), but length of service at high temperatures is less than that of the class 2 materials. The class 1B material also possesses low compression set at high temperature.

Class 2 – Where resistance to extreme high temperature is required to approximately 219ºC (425ºF). Class 2 material possesses low temperature resistance, but only to about -62ºC (-80ºF). Class 2B material also possesses low compression set.

Class 3A – Where resistance to extreme low temperature to approximately -75ºC (-103ºF), and resistance to tearing and flexing are required. Class 3A material also possesses resistance to extreme high temperature to approximately 204ºC (400ºF).

Class 3B – Where resistance to tearing and flexing are required, but the resistance to extreme low temperature requirement is less than that of the class 3A material. Temperature range for the class 3B material is approximately between -70ºC (-94ºF) and 204ºC (400ºF).

7.5 Part identification number (PIN). The following PIN procedure is for government purposes and does not constitute a requirement for the contractor.
The example describes a part numbering system for CID A-A-59588:
A-A-59588 — CID number
1A — Class – 1A, 1B, 2A, 2B, 3A, 3B
25 — Grade – 25, 30, 40, 50, 60, 70, 80

This would be written as: A-A-59588-1A25

7.6 Key words.
Class
Flex resistant
Grade
Low composition