1807 - MOISTURE-CURE URETHANE SYSTEM 1800-10
1807.1 Description
This specification covers a moisture-cure urethane mi caceous iron oxide paint system for use on structural steel. The system may also be used for overcoating applications.
1807.2 Requirements
a. General.
1.Each coating must be supplied as a single component material. All coatings must be well ground, free of caking, skins, gelation, and excessive settling with a shelf life of not less than 12 months. Pigmentation must contain no toxic heavy metals. The VOC content of the coatings must comply with the EPA Federal Register 40 CFR, Part 59, Subpart D, Table 1 for industrial maintenance coatings.
2.All coatings must be able to be applied at rela tive humidity as high as 98% and temperatures as low as 20ºF. There is no restriction on de wpoint temperature differential if th e surface is visibly dry and free from condensate. Verify the surface to be free of any frozen water products when the application temperature is below 32ºF.
3.The manufacturer is responsible for the formulation. Once established, do not change the formulation without prior notification to and approval of the KDOT. b. Coating system for use on full removal and rep aint projects or new construction projects. This system consists of a zinc-rich, moisture-cure polyurethane primer stripe coat applied to all edges, corners, bolts, rivets, and weld seams; a zinc-rich, moisture-cure polyuret hane full primer coat; and a micaceous iron oxide-filled, moisture-cure aliphatic polyurethane topcoat. The topcoat color will be specified on the Contract Documents. All micaceous iron oxide products must comply to ASTM D 5532, Type 1 and have a certificate of compliance.
1.Stripe Primer and Full Primer: Total solids, % by weight ............................................................................... 87 minimum Zinc in the dried film, % by weight ................................................................ 83 minimum
2.Topcoat: Total solids, % by weight ............................................................................... 77 minimum Pigment, Micaceous Iron Oxide ..................................................................... 3 lb/gal minimum
3.Paint System, Cyclic Corrosion/UV Exposure Test, 15 cycles (one cycle = 2 weeks; one week of UV exposure and one week in the Cyclic Corrosion Tester.): Scribe Corrosion ............................................................................................. 7 minimum Unscribed Area ............................................................................................... 8 minimum c. Coating system for use on overcoating projects . This system consists of a zinc-rich/micaceous iron oxide-filled, moisture-cure polyurethane spot primer; a micaceous iron oxide-filled, moisture-cure polyurethane intermediate coat; and a micaceous iron oxide-filled, moisture-cure aliphatic polyurethane topcoat. The topcoat color will be specified in the Contract Documents. Comply all micaceous ir on oxide products to ASTM D 5532, Type 1 and provide a certificate of compliance.
1.Spot Primer: Total solids, % by weight ............................................................................... 86 minimum Pigment, Zinc dust & Micaceous Iron Oxide ................................................. 3.5 lb/gal minimum
2.Intermediate Coat: Total solids, % by weight ............................................................................... 82 minimum Pigment, Micaceous Iron Oxide ..................................................................... 6 lb/gal minimum Color ................................................................................. Tint to distinguish from primer and topcoat 1807 - MOISTURE-CURE URETHANE SYSTEM 1800-11
3.Topcoat: Total solids, % by weight ............................................................................... 77 minimum Pigment, Micaceous Iron Oxide ..................................................................... 3 lb/gal minimum
4.Paint System, Cyclic Corrosion/UV Exposure Test, 15 cycles (one cycle = 2 weeks; one week of UV exposure and one week in the Cyclic Corrosion Tester.): Scribe Corrosion ............................................................................................. 7 - 10 Unscribed Area ............................................................................................... 8 - 10
1807.3 Test Methods
a. Total Solids ...................................................................................................... ASTM D 1644, except heat the sample for 72 hours at 100ºF. b. Cyclic Corrosion/UV Exposure ...................................................................... ASTM D 5894 and KTMR-30 Scribe Corrosion ............................................................................................. ASTM D 1654 Unscribed Area ............................................................................................... ASTM D 1654 c. Zinc in the Dried Film. Pigment .......................................................................................................... ASTM D 2371 Total Solids of the Whole Paint, Non-Volatile .............................................. ASTM D 2369 Calculations: ZnO x 0.8034 = Total Zinc (% Pigment x Total Zinc)/Total Solids = Zinc in Dried Film
1807.4 Prequalification
a. Prequalification of the moisture-cure urethane system is required. Manufacturers desiring prequalification should submit a 1 pint sample of each com ponent to the Engineer of Tests. Manufacturers will be notified of results when testing is complete. The Bureau of Construction and Materials will maintain a list of prequalified materials. b. All applicable liquid components w ill be fingerprinted using infrared spectroscopy for use in screening future verification samples to verify that materials submitted for use are of an identical formulation as originally approved.
1807.5 Basis of Acceptance
Prequalification as required by subsection1807.4. Receipt and approval of a Type C certification as specified in DIVISION 2600. Visual observation of performance on the project.
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Source: Standard Specifications for State Road and Bridge Construction, 2015 Edition. Pages 851–852 of 978. View official source ↗