Highline Products

SPECIFICATIONS: FIBERGLASS POLYMER CONCRETE- Pull Box, Junction Box, Hand Hole, Splice Box, Vaults and Transformer Pads


Polymer Concrete

The pull/splice box ring and cover shall be constructed of polymer concrete consisting of sand and aggregate bound together with a polymer resin. Internal reinforcement may be provided by means of steel, fiberglass, or a combination of the two. The polymer concrete material has the following minimum allowable properties:

Ultraviolet Exposure: Tested in accordance with ASTM G-53 using an U.V.A. 340 bulb.
Flammability Test: Tested in accordance with ASTM D-635.
Accelerated Service: Tested in accordance with Procedure E, ASTM D-756.
Water Absorption: Tested in accordance with Procedure E, ASTM D-570, Section 5,6,1, and 6.5.
Impact Resistance: 72 foot-pounds in accordance with ASTM D-2444 using a C" Tup.
Compressive Strength: 11,000 psi tested in accordance with ASTM C-109 loaded at a rate between 28,000 lbs. to 41,000 lbs. per minute.
Flexural Strength: 7,500 psi tested in accordance with ASTM D-790.
Tensile Strength: 1,700 psi tested in accordance with ASTM C-496.
Skid Resistance: 0.50 coefficient of friction in accordance with ASTM C-1028.
Chemical Resistance: Tested according to ASTM D-543, Section 7, Procedure 1 using
the following chemicals:
Sodium Chloride 5%
Sulfuric Acid 0.1N
Hydrochloric Acid 0.2N
Sodium Sulfate 0.1N
Sodium Carbonate 0.1N
Sodium Hydroxide 0.1N
Transformer Oil Per ASTM D-543
Kerosene Per ASTM D-543


Thickness Tolerance 1/16" to 1/8"
Flexural Strength 17,000 18,000 psi
Flex Modulus .59 .65 psi x106
Tensile Strength 9,100 10,500 psi
Impact Strength (notched Izod) 15 17 ft lbs/inch
Glass Length 1" random orientation
Resin Type Non-Isophthalic
Filler Gypsum
Water Absorption <1%

Compliance with All Industry Standards for Load Requirements

The standard product line is designed and manufactured to perform to and comply with the following industry standards for loading:

  • Western Underground Committee Recommended Guide 3.6 for 10,400# loading for incidental, non deliberate light vehicular traffic.

  • ANSI/SCTE 77 2007 Tier 8 (12,000# Test Load) Tier 15 (22,500# Test Load) and Tier 22(33,750# Test Load) Specification for Underground Enclosure Integrity.

Polymer concrete/polymer concrete-fiberglass products are not intended for use in constant traffic areas.

Product Test Procedures

The following test methods have been used in evaluating the physical and chemical properties of the hybrid fiberglass/polymer concrete product line:

Impact Properties
Compressive Strength
Tensile Strength
Flexural Strength
Chemical Resistance
Simulated Sunlight
Vicat Softening Temperature
Water Absorption
Ultra Violet Resistance
Brittleness Temperature
Static Coefficient of Friction
(Izod) ASTM D 256 ASTM D 2444
ASTM C 109
ASTM C 190
ASTM C 293
ASTM D 543
ASTM D 1501
ASTM D 1525
ASTM D 570
ASTM D 746
ASTM D 635
ASTM C 1028

What is Polymer Concrete?

Polymer concrete is similar to conventional concrete in that it contains selected blends of aggregates and fillers which are held together utilizing a binder. The aggregates include silica, quartz, granite, limestone and other high quality material. Conventional Concrete uses a combination of cement and water for the binder. In polymer concrete the binder is a high strength, corrosion resistant, thermosetting resin. This resin system requires a curing agent (catalyst) which when combined with the resin, transfers the resin and curing agent from a liquid to a solid (thermoset polymer) which bonds to the aggregate, various fillers and internal reinforcement. The polymer concrete is reinforced with fiberglass for superior strength and rigidity.

Why choose polymer concrete enclosures and pads?

  • Lightweight - as much as 90% lighter than concrete enclosures of the same size
  • Cost effective - usually lower installed cost and low life cycle costs.
  • Non-conductive and non-flammable - polymer concrete and fiberglass do not conduct electricity, therefore affording a high degree of safety.
  • Corrosion resistant
  • Good long-term durability with respect to freeze and thaw cycles
  • Rapid curing at ambient temperatures
  • High tensile, flexural, and compressive strengths
  • Corrosion resistant- resistant to alkaline, acids, weathering and aggressive solutions

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