The types of elastomeric coatings and uses
of them are numerous. Here you can learn a little bit about each type and the
purposes for which they are most often used.
Modified Asphalt
A modified asphalt coating consists of
asphalt and rubber-like polymers. This material is most often used on roofs,
although there are a few other applications. It is not suitable for sealing
driveways or for covering other asphalts, as it does not adhere directly to
asphalt.
There are several disadvantages of this
material. It is only available in black, which absorbs and transfers heat,
making the building hotter if it is used on the roof. Softening and
deterioration occurs over time due to exposure to solvents, grease and UV
light.
Polyurethane
There are several categories of
polyurethane coatings. They are used to cover spray-foam, wooden decking and
other building materials. None are exactly waterproof, although they do help to
prolong the life of wood by preventing rot.
Aromatic polyurethanes are one type. The
disadvantages include discoloration and chalking over time. They are often used
as a base coat for other polyurethanes, although when used as a final coat, the
appearance is initially pleasing. Modified and single component polyurethanes
are also available.
Silicone
Silicone types of elastomeric coatings and
uses are limited. They are recommended in situations where “breathability” is
desired. Moisture vapor can pass through the coating.
Silicone is not compatible with other
materials. For example, an EPDM coating will not adhere to silicone. Since the
coating allows the passage of water vapor, it is not recommended for roofing or
similar applications.
Neoprene
Neoprene is a type of synthetic rubber made
by DuPont. The coating is fast drying and retards vapors, but a top coat is required
when the coating is used on exterior surfaces. Thus, there are numerous
limitations to types of elastomeric coatings, roof coatings and uses of them.
Hypalons
Hypalons are another type of synthetic
rubber also made by DuPont. The Hypalons have more applications than the
Neoprene material. They can be used as fire retardant and waterproofing agents.
They are often used in roofing and for coating tanks and coolers.
The Hypalons are compatible with other
coatings and can be used on top of many of them, but it is necessary to check
with the manufacturer about that.
Butyl Rubber Types of Elastomeric Coatings
and Uses
Butyl rubber is the most water resistant
coating, which makes it a good choice for applications that are very wet or
very cold. The coating is often used in coolers, freezers and cryogenic storage
units, water storage units, ponds, pools and roofs.
There are limitations of this type of
coating. It can be damaged by hail, foot traffic or flying debris. It has a
tendency to become chalky and is more sensitive to weather than some of the
other options.
EPDM
EPDM is yet another type of synthetic
rubber. It has the widest range of applications and the highest compatibility
with other materials. Only asphalt and silicone cause problems with adhesion.
The coating can be used on those surfaces if an undercoating is used.
Flame retardant materials can be added to EPDM
if fireproofing is desired. The UL listing on the manufacturer’s label will
reveal the fire resistance of the coating.
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