Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
DMS-6340, Vehicle Loop Wire Sealant
Overview
Effective Dates: August 2004 – June 2006.
This Specification governs for the Quality Monitoring Program (QMP) for Vehicle Loop
Wire Sealants. This Specification describes procedures that will identify prequalification
requests, prequalification procedures, quality control requirements, disqualification,
sampling, requalification, and material requirements. Three types of sealants are described.
Types of Sealants
Type I
This sealant is a one-part moisture cured material with the ability to encapsulate and seal the
vehicle loop wire. There are two classes:
 Class A
 This sealant is supplied in a pre-packaged configuration, to be dispensed by a manual
applicator or caulking gun.
 Class B
 This sealant is supplied in bulk form, either in one-gallon containers or five-gallon
containers.
 Application of this material is accomplished by manual or mechanical means, as
recommended by the manufacturer.
Type II
This sealant is a two-part formulation that is intended for use when a quick-curing, highstrength material is desired. There are two classes:
 Class A

This sealant is a pre-packaged dual cartridge configuration.

Ratios and sizes of the cartridges are as recommended by the manufacturer.
 Class B

This sealant is in bulk form in either one-gallon or five-gallon containers.

The mixing ratio of part A to part B is one-to-one by volume.

Application of this material is accomplished by manual or mechanical means, as
recommended by the manufacturer.
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Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
Type III
This sealant is a hot-melt material where a heating apparatus is required to liquefy and
dispense the material.
Application of this material is accomplished by manual or mechanical means, as
recommended by the manufacturer.
Material Producer List
The Materials & Pavements Section of the Construction Division (CST/M&P) maintains a
material producer list (loopwire) of all materials conforming to the procedures and
requirements of this program. This list is updated yearly, expiring on the last day of
December.
Prospective qualifiers may submit their material at any time during the year, but
prequalification will expire at the end of the calendar year. Prospective qualifiers should
submit their material no later than the last day of November to be considered for
prequalification for the entire year.
CST/M&P reserves the right to randomly sample from the manufacturing plant, warehouse,
or job site, at any time during the approved period.
Prequalification requests should be submitted to the Texas Department of Transportation,
Construction Division, Materials & Pavements Section (CP51), 125 East 11th Street, Austin,
Texas 78701-2483.
Payment
Procurement by the State
Payment for all materials under this Specification will be in accordance with the conditions
prescribed in the contract awarded by the state.
Contracts
All materials under this Specification utilized by the contractor will be paid in accordance
with the proper item.
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Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
Performance History
Establishment of Performance History
Prospective bidders and/or suppliers may be required to install their material at a test
location. Materials and installation will be provided by the manufacturer, supplier, or their
representative.
Some tests required by this Specification extend over a prolonged period. Therefore, testing
for acceptance of materials supplied on any contract or state purchase order will only be
considered on those materials which determined by the Director of CST/M&P to be
identifiable as a material having an established performance history of compliance with
criteria established by this Specification.
Requalification
When, in the opinion of the Director of CST/M&P, changes have been made in the
composition or manufacturing process of a prequalified material, a re-evaluation of the
performance may be required.
The Department may conduct additional tests to identify changes in the material. Changes
that are detected in the composition or manufacturing process, which have not been reported
by the manufacturer, may be cause for removal of that material from the quality monitoring
program (QMP).
If a material is removed from the QMP, the manufacturer may re-submit their product for
requalification, only after submitting a test report from an independent laboratory with test
data that certifies that the material meets the requirements of this program.
Sampling and Testing
Sampling will be as determined by CST/M&P. Testing will be in accordance with the
methods listed in ‘Material Requirements.’ All materials for prequalification must be
submitted at no cost to the Department.
Costs of testing and sampling are normally borne by the Department. However, the costs of
sampling and testing materials failing to conform to the requirements of this Specification
are borne by the contractor or supplier. Costs of sampling and testing failing material will be
assessed at the rate established by the Director or CST/M&P and in effect at the time of
testing.
The Department reserves the right to conduct random sampling of prequalified materials for
testing and to perform random audits of test reports. Department representatives may sample
material from the manufacturing plant, the project site, and the warehouse. CST/M&P
reserves the right to test samples to verify compliance with “DMS-6340, Vehicle Loop Wire
Sealant.”
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Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
The Department reserves the right to perform any or all tests required by this Specification
to verify tests reported by the manufacturer. In the case of variance, the Department test
will govern.
Material Requirements
General Requirements
Sealants are one- or two-component materials and are suitable for use in both asphaltic and
concrete pavement.
Sealants do not shrink, swell, or crack during or after its curing process.
Application equipment, techniques, and temperature range are in accordance with the
manufacturer’s recommendations.
Material temperature must not exceed 177ºC (350°F) in its pre-heated or chemically reactive
state.
The sealant, upon application, must be of sufficient free-flowing consistency to thoroughly
fill the road cavity.
Physical Properties
Sealants have a minimum shelf life of 12 months.
Sealants have physical characteristics as classified and outlined by the following
requirements.
 Type I, Class A and B
Property
Bond Strength
(Hardened concrete to
hardened concrete)
Type I, Class A and B
Requirements
Standard
 345 kPa (50 psi) minimum
 "Tex-614-J, Testing Epoxy
Materials”
 48 hours
 25ºC (77F)
Curing Time
 24 hour tack-free time,
maximum
 48 hours complete
 ASTM C 679
 1.0 mm (40 mil) thickness at 25ºC
(77F), 50%RH
Elongation
 50% minimum
 48 hours
 “Tex-618-J, Testing Elastomeric
Concrete”
 25ºC (77F)
Tensile strength
 690 kPa (100 psi) minimum
 48 hours
Asphalt Compatibility
No Reaction
 “Tex-618-J, Testing Elastomeric
Concrete”
 25ºC (77F)
ASTM D 5329
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Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
Note: To prevent tracking, it is recommended to broadcast sand over a Type I sealant
immediately after application and before opening sealed slot to traffic.
 Type II, Class A
Property
Gel Time
Type II, Class A
Requirement
3 minutes minimum
Standard
 "Tex-614-J, Testing Epoxy
Materials”
 25ºC (77F)
Bond Strength
(Hardened concrete to
hardened concrete)
 1379 kPa (200 psi) minimum
 48 hours
 “Tex-614-J, Testing Epoxy
Materials”
 25ºC (77F)
Elongation
 10% minimum
 48 hours
 “Tex-618-J, Testing Elastomeric
Concrete”
 25ºC (77F)
Curing Time
45 minute maximum tack-free
time.
Asphalt Compatibility
No Reaction
 ASTM C 679
 1.0 mm (40 mil) thickness at 25ºC
(77F), 50%RH
ASTM D 5329
 Type II, Class B
Property
Gel Time
Type II, Class B
Requirement
10 minutes minimum
Standard
 "Tex-614-J, Testing Epoxy
Materials”
 25ºC (77F)
Bond Strength
(Hardened concrete to
hardened concrete)
 1379 kPa (200 psi) minimum
 48 hours
 “Tex-614-J, Testing Epoxy
Materials”
 25ºC (77F)
Elongation
 10% minimum
 48 hours
Curing Time
45 minute maximum tack-free time.
Asphalt Compatibility
No Reaction
 “Tex-618-J, Testing Elastomeric
Concrete”
 25ºC (77F)
ASTM C 679
1.0 mm (40 mil) thickness at 25ºC
(77F), 50%RH
ASTM D 5329
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Departmental Material Specifications
DMS-6340, Vehicle Loop Wire Sealant
 Type III
Property
Curing Time
Type III
Requirement
45 minutes maximum tackfree time
Bond Strength (Hardened
concrete to hardened concrete)
Ductility
345 kPa (50 psi) minimum
Asphalt Compatibility
No Reaction
10 cm, minimum
Standard
 ASTM C 679
 1.0 mm (40 mil) thickness at 25ºC
(77F), 50%RH
"Tex-614-J, Testing Epoxy Materials”
 ASTM D 113
 25ºC (77F), at 5 cm per minute
ASTM D 5329
Resistance
The cured sealants are resistant to the following chemicals:
Chemical
Deicers
Motor oil
Sodium Chloride Solution (5%)
Hydraulic Brake Fluid
Chemical Resistance
Effect
No effect


No effect


No effect

Standard
ASTM D 471
25ºC (77F) after 22 hours
ASTM D 471
25ºC (77F) after 22 hours
ASTM D 471
 25ºC (77F) after 22 hours
No effect
 ASTM D 471
 25ºC (77F) after 22 hours
Certification
The contractor must provide written certification from the manufacturer stating that the
material supplied meets the requirements of this Specification.
Failure of a sample will require that the loops be removed and replaced with the new sealant
meeting this Specification.
Archived Version
The following archived versions of "DMS 6340, Vehicle Loop Wire Sealant" are available:
 6340-0400 for the Specification effective April 2000 through July 2004.
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