Published by department of transportation

80-3.02 MATERIALS

80-3.02A General

Do not use materials imperfectly galvanized or coated or with serious abrasions.

For barbed wire on a chain link fence, comply with section 80-2.02D.

80-3.02B Posts and Braces

Posts and braces must comply with the strength requirements in ASTM F1043:

1. Group IA, regular grade, for round posts

2. Group II-L for roll-formed posts and braces

1. Exterior surfaces of tubular posts and braces must have a combination coating consisting of hot-dip galvanized primer followed by a chromate conversion coating and then a finish coat of clear, cross-linked organic coating. For this combination coating:

1.1. Thickness of the zinc coating must be at least 0.9 mil as determined from the average results of at least 2 samples and at least 0.8 mil on an individual sample

1.2. Chromate conversion coating must be at least 15 μg/sq in

1.3. Total thickness of the combination coating must be at least 1.7 mils

1.4. Exterior clear-coated surface of the pipe must have demonstrated the ability to resist 1,000 hours of exposure to salt fog with a maximum of 5 percent red rust when tested under ASTM B117

1.5. Clear finish coat must not have any film cracking after 500 hours of exposure in an artificial weathering device under one of the following:

1.5.1. ASTM G152, cycles 1, or 3 Carbon Arc artificial weathering device

1.5.2. ASTM G155, cycles 1, or 2 Xenon Arc artificial weathering device

1.6. Clear finish coat must not have blistering or cracking after 500 hours of exposure to 100 percent relative humidity under ASTM D2247

2. Interior surfaces must have a zinc coating or a cross-linked organic coating containing a corrosion inhibitor. For these coatings:

2.1. Coating thickness must be at least 0.3 mil

2.2. Interior coated surface must have demonstrated the ability to resist 300 hours of exposure to salt fog with a maximum of 5 percent red rust when tested under ASTM B117
Obtain authorization of the protective coating system before you use it. Any change to the protective coating system is a new system that requires authorization.

Each post length must be at least the depth of the concrete footing plus the height of the fabric less 4 inches. The length does not include any top fixture or other top tension wire support integral with the post.

Each post must have provisions to securely hold the top tension wire in position and allow for post removal and replacement without damaging the wire. Fit each tubular post with a rainproof top.

Post tops, extension arms, stretcher bars, and other fittings and hardware must be:

1. Steel or malleable or wrought iron

2. Galvanized after fabrication under section 75-1.02B

80-3.02C Fabric

Chain link fabric must comply with AASHTO M181 for Type I fabric with a Class C coating or ASTM F1345, Class 2, unless vinyl-clad fabric is described in the fence bid item; in which case, the fabric must comply with AASHTO M181 for Type IV fabric with a medium or dark green Class A coating.

The wire for the fabric must be:

1. 11 gauge for a fence 84 inches or less in height

2. 9 gauge for a fence over 84 inches in height and for a slatted chain link fence

Chain link fabric for nonslatted fence must have the diamond count corresponding to the fabric height shown in the following table:

Diamond Counts
Fabric height (inches)	36	42	48	60	72	84	96
Diamond count	10-1/2	12-1/2	13-1/2	17-1/2	20-1/2	24-1/2	27-1/2

Chain link fabric for slatted fence must have 3-1/4-inch-vertical and 5-1/4-inch-horizontal mesh.

Knuckle finish fabric on the top and bottom edges.

80-3.02D Tension Wires, Hog Rings, Turnbuckles, Truss Tighteners, Truss Rods, and Stretcher Bars and Bar Bands

Tension wire must be commercial-quality 7-gauge coil spring steel.

Tie wires and hog rings must be at least 9-gauge steel.

Post clips must be at least 6-gauge steel.

Galvanize tension and tie wires, hog rings, and post clips under ASTM A116, coating Class 3.

Turnbuckles and truss tighteners must be:

1. Commercial-quality steel, malleable iron, or wrought iron

2. Galvanized under section 75-1.02B

3. Equal in tensile strength to the truss rod

Truss tighteners must have a strap thickness of at least 1/4 inch.

Each truss rod must be steel and have a diameter of at least 3/8 inch.

Each stretcher bar must be at least 1/4 by 3/4 inch.

Each stretcher bar band must be at least 1/8 by 3/4 inch.

80-3.02E Slats

Slats must be wood or plastic.

Wood slats must be one of the following:

1. Clear redwood

2. Medium-weight wood produced from the species Shorea (Meranti)

Each wood slat must have:

1. Thickness of at least 1/4 inch

2. Width about 2-5/8 inch

3. Length enough to fill the vertical openings of the fabric

Each plastic slat must:

1. Be a HDPE with UV inhibitors

2. Have a flat tubular cross section with:

2.1. Wall thickness of about 0.03 inch

2.2. Depth of about 0.325 inch

2.3. Width of about 2.38 inches

2.4. Length equal to the fence height
The plastic slat material must comply with the requirements shown in the following table:

Plastic Slat Material Requirements
Quality characteristic	Test method	Requirement
Melt index	ASTM D1238	0.24
Density	ASTM D1505	0.951
Low temperature brittleness (°F)	ASTM D746	-76
Tensile strength (psi)	ASTM D638	3,700

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