Texas Comptroller of Public Accounts

Texas Comptroller of Public Accounts, Glenn Hegar

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Texas Specification No.060-75-01B
Effective Date:February 28, 1985
Last Revision:April 10, 1996
(For Automated Machine, Mold-Cured)
1.SCOPE:This specification establishes the minimum
requirements for one type and one grade of tread rubber stock
for use in retreading pneumatic tires for passenger, light duty
commercial, truck, and off-the-highway vehicles and equipment.

specifications, standards, test materials, and other documents
that are in effect on the date of the Invitation for Bids are
applicable.Copies of the referenced documents are available
from the issuing organizations at the addresses shown.The
following publications are part of this specification to the
extent specified herein:

2.1.FEDERAL TEST METHODS:General Services Administration
(GSA), Business Service Center, Region 3, Seventh and D Streets,
Southwest, Washington, DC 20407: -- Test Method for Rubber:Sampling and Testing. -- Test Method for Tensile Strength. -- Test Method for Elongation, Ultimate. -- Test Method for Tensile Stress. -- Test Method for Specific Gravity, Hydrostatic. -- Test Method for Chemical Analysis of Synthetic
Rubber Compounds, General. --Test Method for Identification of Synthetic

Race Street, Philadelphia, PA, 19103:

2.2.1.ASTM D 297 -- Chemical Analysis of Rubber Products.

2.2.2.ASTM D 412 -- Tension Testing of Vulcanized Rubber.

2.2.3.ASTM D 1646 -- Viscosity and Curing Characteristics of
Rubber by the Shearing Disk Viscometer.

2.2.4.ASTM D 2084 -- Measuring Curing Characteristics with the
Oscillating Disk Cure Meter.

2.2.5.ASTM D 3182 -- Standard Materials, Equipment, and
Procedures of Mixing Rubber Compounds and for Preparing
Vulcanized Test Sheets.
3.REQUIREMENTS:The tread rubber stock furnished under this
specification shall meet or exceed the following requirements:

3.1.Type:The tread rubber shall be that known commercially as
the regular cure type produced for use in an automated machine
such as the Orbitread machine manufactured by American Machine
and Foundry Company.

The strip stock shall have good adhesive qualities for
application after processing through the Orbitread machine.
Refer to Paragraph 3.7. for release coating required to prevent
sticking prior to machine processing.

3.2.Grade:The trade rubber shall be a premium grade
compounded for top performance and maximum mileage obtainable.
The physical properties of the tread rubber shall be equal or
better than those specified in Paragraph 3.5.

3.3.Materials:The tread rubber material shall be suitable for
either top capping or full capping.The tread rubber shall be
free from excess porosity, foreign material, and lumps of cured

3.4.Standard Tread Rubber Formula:The standard tread rubber
formula to be used in compound trade rubber stock to furnished
to the State of Texas tire retreading plant shall be as follows:

3.4.1.Masterbatch: of rubber hydrocarbon to be not less than
43% by weight. hydrocarbon to contain approximately 35%
polybutadiene and approximately 65% styrenebutadiene. extract not to exceed 22%. black of the ASTM N 234 or better type is the
only filler to be used.Percentage of black not to exceed 32%. off specification materials, reclaimed, or restored
materials are to be used.

3.5.Physical Properties:The physical properties (quality
control standards) of the tread rubber compound (finished
product) shall meet the requirements of the following Table 1,
when tested as specified in Table 2, Paragraph 4.

3.6.Material Size:The unvulcanized rubber strip stock shall
be not less than two-and-three-eighths inches (2-3/8") and not
more than three-and-one-eighth inches (3-1/8") in width.The
thickness shall be one-half inch (1/2") plus or minus one-eighth
inch (ñ 1/8").The stock must be capable of being cold fed in
an Orbitread extruder with no regurgitation or cut off.

3.7.Release Coating:The strip stock shall be given a release
coating by passing the strip through a soap solution dip, or by
other equivalent means.the release coating shall be such that
the strip shall not stick to itself or to the shipping
container.The coating shall not affect the adhesive qualities
of the rubber after it is processed through the Orbitread

3.8.Storage Life:Tread rubber furnished under this
specification shall be satisfactory for its intended used and
shall meet the requirements of Table 1 for a minimum period of
six months after date of manufacture.The tread rubber shall
show no more than a light sulfur or antiozonant bloom provided
the following certified storage and shipment conditions have
been maintained by the manufacturer.

3.8.1. The materials have been protected from physical damage
during the storage and shipment period.

3.8.2. The maximum ambient air temperature during storage and
shipment has not exceed plus 100øF.

3.8.3. The average ambient air temperature during storage and
shipment has not exceed 80øF ñ 5øF.

NOTE: Temperature controlled transporting equipment should be
used for shipments, if required, in order to comply with the
temperature requirements specified.

3.9.State Storage Facilities:The temperature of State of
Texas storage facilities for the tread rubber should not exceed
80 F.

4.TESTING:Testing shall be done by or at the direction of,
the Commission and/or the receiving State agency.Tests shall
be performed on products from shipments to ordering agencies.
In the event products tested fail to meet or exceed all
conditions and requirements of this specification, the cost of
the samples used and the cost of testing shall be borne by the

5.INSPECTION:Inspection shall be done by or at the direction
of the Commission.The inspector shall have access to the plant
and premises of the manufacturer during all working hours
throughout the life of the contract.The manufacturer shall
furnish, at no charge and at the place of manufacture, all
equipment, apparatus, assistance, information, or evidence which
the inspector may require to satisfactorily determine that the
tread rubber being manufactured complies with all requirements
of this specification.

6.PACKAGING:The strip stock shall be laid in shipping
containers and shall not have breaks or splices.The type of
shipping container used shall be in accordance with the
manufacturer's standard practice, assuring safe delivery of the
material to its destination, and shall be packaged on forty-two
inch by forty-two inch (42" by 42") non-returnable pallets,
total weight approximately 2,000 pounds per pallet.

7.MARKING and/or LABELING: 7.1.Marking:Each shipping pallet shall be clearly marked with
the following data:

7.1.1. Name of contents.

7.1.2. Quantity contained.

7.1.3. Order number or contract number.

7.1.4. Name and address of ordering agency.

7.1.5. Agency requisition number.

7.1.6. Name and address of manufacturer.

7.2.Labeling:Each product container shall bear a securely
affixed and durable label showing the following:

7.2.1.Date of manufacture.

7.2.2. Containers shall be numbered consecutively.If two or
more boxes are filled from the same run, they shall bear the
same number.

7.2.3. Each mill batch shall have a cure time listed by cure
class of the Rubber Manufacturers Association.

8.COMPLIANCE:In order for consideration to be given to the
bid on an item under this specification, the bidder must comply
with the following:

8.1.PRODUCT IDENTIFICATION:The make, model number, name of
the manufacturer, brand or trade name, etc., as applicable, of
the item which the vendor proposes to furnish must be stated as
part of the bid.

8.2.EXCEPTIONS:Notwithstanding the above, any exception taken
by the bidder to the requirements and conditions of this
specification must be stated and described in detail as a part
of the bid.If no exceptions or deviations are identified in
this manner, the items must be furnished exactly as described

8.3.PROOF:The bidder shall bear the burden of proof of
compliance with this specification.

9.ORDERING DATA:When ordering products conforming to this
specification the requisitioning agency shall specify the

9.1.The number of this specification (060-75-01B).

9.2.The total number of pounds required.

9.3.Shipping instructions, to include acceptable means of

his bid a statement showing the date he can start production if
awarded the contract or order and the approximate number of
working days required for the completion of the order or
contract.The successful bidder shall notify the Commission's
Inspector, of the beginning and ending dates of production
schedule.This information must be sent to the Commission's
Inspector seven (7) days prior to the beginning date of
production schedule.Location and name of manufacturing plant
must be stated in the bid.

11.AWARD OF BID:The award of bid will be based on the price
of tread rubber per pound (F.O.B. destination) plus the cost of
in-plant inspection by an employee of the State of Texas.(See
Paragraph 5.)State authorized travel allowances are as follows:

Mileage Allowance by Automobile -- $.23 per mile (9/1/83 --

Per diem Allowance (24-hour period) -- $40.00 (9/1/83 --

Or as revised by statute from time to time, usually biannually.

NOTE: Refer to Paragraph 10., Statement of Production
Schedule.In-plant inspection will be limited to one round
trip, unless otherwise specified in the Invitation for Bids,
with the time of inspection required based on the actual number
of working days required by the contractor to complete the order.

specification may be obtained by calling or writing:

Bid Services
Texas Procurement and Support Services
P.O.Box 13186
Austin, TX78711-3047
(512) 463-3416

Physical Property Requirements

Property * Requirement
1. Specific Gravity, g/cc 1.18 0.01
2. 300% Modulus, psi:
13*/298 F 800 -- 1100
40*/298 F 1500 -- 1850
3. Tensile @ break, psi:
13*/298 F 2200 minimum
40*/298 F 2400 minimum
4. Elongation @ break, percent:
40*/298 F 475 minimum
5. Monsanto Rheometer:
35"/280 F not to exceed 90% of optimum cure
6. Mooney Scorch Requirements:
MS @ 250 F (3 pt. rise) 25 minutes minimum
7. Mooney Plasticity Standards:
ML @ 212 F @ 4 minutes 47 -- 57

NOTE: Accelerating and curing agents must be added,
as required, by manufacturer to meet the requirements of Table One (1).


Characteristic Test Method ASTM *1 Test Method Federal *2 Alternate Test Method *3
Preparation of Sample ASTM D 3182
300% Modulus (Tensile Stress) ASTM D 412 4131
Tensile Strength, psi ASTM D 412 4111
Elongation, percent ASTM D 412 4121
Specific Gravity ASTM D 297 14011 Zinc Chloride
Chemical Analysis ASTM D 297 15001 and 15011
Mooney Scorch Requirements *4 ASTM D 1646
Mooney Plasticity Standard *5 ASTM D 1646
Measurement of Curing characteristicstics *6

NOTE *1:American Society for Testing and Materials.

NOTE *2Federal Test Method Standard No. 601.

NOTE *3Approved Alternate Test Method for Specific Gravity (Filtered
solutions of zinc chloride and distilled water).

NOTE *4Use Mooney shearing disk viscometer with small rotor.

NOTE *5Use Mooney shearing disk viscometer with large rotor.

NOTE *6Rheometer curing characteristics.Rheometer tests shall be made
on finished batch material (s) to substantiate viscosity
consistency and Rheochart (s) shall be made available to the
State Inspector or ordering state agency upon request.(See
labeling requirements in Paragraph 7.2.)

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