How The Top Hat Riser is Made

Made from 100% recycled rubber from discarded tires, and carrying a guarantee for durability, the patented Top Hat Riser manufacturing process ensures your Top Hats will perfectly repair even the most difficult low manholes.

Made from 100% Recycled Tire Rubber

The goal of going “green” is a popular concept these days – and for good reason. The environment has become a growing international concern, and at the center of the proposed solutions is the idea of re-purposing and recycling discarded materials.

Abart Industries noticed this disturbing trend in 1999 and developed an innovative idea that would provide a means to re-purpose one of the worlds most durable and long lasting products. Automobile tires are constructed of very durable rubber material – a material that does not biodegrade nor breaks down over time. Used tires often find themselves filling overcrowded landfills where they take up space and provide a venue for disease and famine to grow. Illnesses such as West Nile Virus and Malaria thrive in the moist, filthy areas.

Furthermore, the burning of tires at the landfill site is one of the more dangerous actions that can be inflicted upon our planet’s o-zone layer. So why are we so eager to dispose of a material that we know to be durable for the long haul? In the past, we have not had the means to re purpose these used tires. However, with advancements in technology and the forward, green friendly thinking of Abart Industries, a patent pending process has been developed to eliminate these excuses. We now have a way to re purpose this rubber material in a way that puts it to use for years to come.

Technical Specifications

Physical Property
Acceptable Results
Test Method (Descriptions below)
1.16 g/cm3
ASTM C 642 – 90
Durometer Hardness
65 A ± 7 points
ASTM D 2240
Tensile Strength
300 psi
ASTM D 412 – 87
Compression Deformation
20˚C – 70 psi – 10%
ASTM D 575 – 88
Brittleness at Low Temperature
-40˚F (-40˚C)
ASTM D 746 – 79
Freeze and Thaw when exposed to De-icing Chemicals
No loss after 50 cycles
ASTM C 672 – 91
Coefficient of Thermal Expansion
1.44 x 10 (-4) mm/mm/˚C (8×10 (-5) in/in/˚F)
ASTM C 531 – 85
Weathering 70 hours at 70˚C
ASTM D 573 – 88
-Hardness Retained
100% (±5%)
-Compressive Strength
100% (±5%)
-Tensile Strength Retained
100% (±5%)
-Elongation Retained
100% (±5%)

Description of Test Methods

ASTM C 642
Standard Test Method for specific gravity, absorption and voids in hardened concrete
ASTM D 412
Standard Test Method for Rubber Properties in Tension
ASTM D 746
Standard Test Method for Brittleness Temperature of plastics and Elastomers by Impact.
ASTM C 672
Standard Test Method for Scaling Resistance of Concrete Surfaces Exposed to Deicing Chemicals
ASTM C 531
Standard Test Method for Linear Shrinkage and Coefficient of Thermal Expansion of chemical-resistant Mortars, Grouts, and Monolithic Surfaces
ASTM D 573
Standard Test Method for Rubber- Deterioration in Air Oven
ASTM D 575
Standard Test Method for Rubber Properties in Compression

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