Use and Care Manual

FIBERGLASS LADDER TECHNICAL MANUAL
11
NOTE: Specimen sizes used for determining these properties shall be as follows:
(1) Flexural: based upon Method I, Procedure A, of Tests for Flexural Properties of Unreinforced and
Reinforced Plastics and Electrical Insulating Materials, ASTM D780-91, with the outer surface of
the composite down.
Preferred sizes are:
a. Flange lengthwise: 1/2-inch wide where thickness is greater than 1/8 inch;
span-to-depth ratio approximately 36.5:1.
b, Web lengthwise: 1-inch wide where thickness is less than 3/16 inch; span-to-depth
ratio approximately 36.5:1.
c. Web crosswise: 1-inch wide where thickness is less than 3/16 inch; span-to-depth
ratio is approximately 16:1. Omit test when proper specimen length is not available.
(2) Tensile: Type I
(3) Compression: use support jig with dogbone-shaped specimens for all tests.
Preferred sizes are:
a. Flange lengthwise: 1/2-inch-wide neck.
b. Web lengthwise: 1/2-inch-wide neck.
NOTE: Specimen sizes used for determining these properties shall be as follows:
(1) Flexural: based upon Method I, Procedure A, of Tests for Flexural Properties of
Unreinforced and Reinforced Plastics and Electrical Insulating Materials, ASTM
D790-91, with the outer surface of the composite down.
Preferred sizes are:
a. Flange lengthwise: 1/2-inch wide where thickness is greater than 1/8 inch;
span to depth ratio approximately 36.5:1.
b. Web lengthwise: 1-inch wide where thickness is less than 3/16 inch;
span-to-depth ratio approximately 36.5:1.
c.
Web crosswise: 1-inch wide where thickness is less than 3/16 inch; span-to-depth
ratio is approximately 16:1. Omit test when proper specimen length is not available.
(2) Tensile: Type I
(3) Compression: use support jig with dogbone-shaped specimens for all tests
except web crosswise, which are straight specimens.
Preferred sizes are:
a. Flange lengthwise: 1/2-inch-wide neck.
b. Web lengthwise: 1/2-inch-wide neck.
c. Web crosswise: 1/2-inch wide x 1-1/2 inches long, supported on both ends.
Omit test when proper specimen length is not available.
FIBERGLASS LADDER TECHNICAL MANUAL
11
ANSI A14.5 FIBERGLASS LADDER STANDARD
(SELECTED SECTIONS ABSTRACTED FROM A14.5, Continued)
Qualification Coupon Tests — Minimum Composite Properties*
Testing Condition
Condition A of ASTM D709-78
Flange Web Web Web Lengthwise†
Material Property Lengthwise† Lengthwise† Crosswise†
Flexural Strength, psi 38,000 35,000 8,000
Flexural Modulus, 10
6
psi 2.0 1.8 0.70
Tensile Strength, psi 45,000 30,000 ---
Tensile Modulus, 10
6
psi 2.8 2.0 ---
Comprehensive Strength, psi 40,000 28,000 10,000
Comprehensive Modulus,
10
6
psi 2.8 2.0 ---
Ultimate bearing strength, psi ‡ --- 30,000 ---
Impact Izod (ASTM D256),
Ft. lb. per inch of notch --- 20 ---
*This table is based on procedures outlined in ASTM D229-91, †Lengthwise or Crosswise of pultrusion direction.
Testing Rigid Sheet and Plate Materials Used for Electrical Insulation. ‡See test for Bearing Strength of Plastics, ASTM D953-87.
TABLE 2
Wet 150°F Weathering
26,000 26,000 28,000
1.4 1.4 1.4
23,000 21,000 23,000
1.5 1.4 1.5
21,000 19,000 22,000
1.5 1.4 1.6
--- --- ---
--- --- ---