Natural and Artificial Weathering of Sealants

Searle, Norma D.

doi:10.1201/9781420008630-c5

Cited by 2 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Weathering can have several negative impacts on coatings, including fading with the associated color change, surface erosion, and loss of gloss. [17][18][19][20][21][22][23][24][25] Material degradation by weathering starts by direct sunlight radiation, where the bonds in the polymers start to break. Also, weathering effects can be observed in different levels, including molecular, microscopic, and macroscopic.…”

Section: Effect Of Weathering On Intumescent Coatingsmentioning

confidence: 99%

“…Accelerated laboratory weathering tests are performed in a controlled weathering chamber, where weathering factors (eg, relative humidity, UV exposure, and temperature) can be controlled and manipulated. [17][18][19] Natural weathering tests are performed outdoors on fixed-angle racks or fences in those locations with predefined orientations (eg, north and south) to evaluate the effects of natural weathering factors, such as solar radiation 17 and precipitation. Accelerated weathering is a modified outdoor weathering procedure using the Sun as the source of irradiance.…”

Section: Effect Of Weathering On Intumescent Coatingsmentioning

confidence: 99%

“…Fire‐retardant coated building materials should maintain their performance when used in exterior applications for a predictable service life. Weathering can have several negative impacts on coatings, including fading with the associated color change, surface erosion, and loss of gloss . Material degradation by weathering starts by direct sunlight radiation, where the bonds in the polymers start to break.…”

Section: Introductionmentioning

confidence: 99%

“…There are 3 types of weathering durability tests: artificial accelerated laboratory weathering, natural weathering, and accelerated natural weathering. Accelerated laboratory weathering tests are performed in a controlled weathering chamber, where weathering factors (eg, relative humidity, UV exposure, and temperature) can be controlled and manipulated . Natural weathering tests are performed outdoors on fixed‐angle racks or fences in those locations with predefined orientations (eg, north and south) to evaluate the effects of natural weathering factors, such as solar radiation and precipitation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of natural weathering on the fire properties of intumescent fire‐retardant coatings

et al. 2018

View full text Add to dashboard Cite

Summary Fire‐retardant coatings could be one option for providing enhanced protection to buildings during a wildfire, particularly when applied to combustible siding and in under‐eave areas. Limited studies have been conducted on their effectiveness but maintaining adequate performance after weathering has been questioned. This paper reports on a study evaluating the effect of natural weathering on the performance of intumescent‐type fire‐retardant coatings. The main concerns were (a) the reduction of ignition resistance of the coating after weathering and (b) the coating might contribute as a combustible fuel and assist the fire growth after weathering. This study evaluated the performance of 3 intumescent coatings that were exposed to natural weathering conditions for up to 12 months. A bench‐scale evaluation using a cone calorimeter was used to evaluate the performance of the coatings at 3 heat flux levels (30, 50, and 70 kW/m2). Our results showed that weathering exposure reduced the effectiveness of fire protection of intumescent coatings, but the weathered coatings did not act as additional fuels. Weathering orientation showed much less effect on the performance of intumescent coatings in comparison to other parameters. There was statistical evidence that weathering duration, heat flux level, and coating type affected the combustion properties.

show abstract

Section: Effect Of Weathering On Intumescent Coatingsmentioning

confidence: 99%

Section: Effect Of Weathering On Intumescent Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of natural weathering on the fire properties of intumescent fire‐retardant coatings

et al. 2018

View full text Add to dashboard Cite

show abstract

An accelerated exposure and testing apparatus for building joint sealants

White

Hunston

Tan

et al. 2013

Review of Scientific Instruments

View full text Add to dashboard Cite

The design, fabrication, and implementation of a computer-controlled exposure and testing apparatus for building joint sealants are described in this paper. This apparatus is unique in its ability to independently control and monitor temperature, relative humidity, ultraviolet (UV) radiation, and mechanical deformation. Each of these environmental factors can be controlled precisely over a wide range of conditions during periods of a month or more. Moreover, as controlled mechanical deformations can be generated, in situ mechanical characterization tests can be performed without removing specimens from the chamber. Temperature and humidity were controlled during our experiments via a precision temperature regulator and proportional mixing of dry and moisture-saturated air; while highly uniform UV radiation was attained by attaching the chamber to an integrating sphere-based radiation source. A computer-controlled stepper motor and a transmission system were used to provide precise movement control. The reliability and effectiveness of the apparatus were demonstrated on a model sealant material. The results clearly show that this apparatus provides an excellent platform to study the long-term durability of building joint sealants.

show abstract

Natural and Artificial Weathering of Sealants

Cited by 2 publications

References 0 publications

Effects of natural weathering on the fire properties of intumescent fire‐retardant coatings

Effects of natural weathering on the fire properties of intumescent fire‐retardant coatings

An accelerated exposure and testing apparatus for building joint sealants

Contact Info

Product

Resources

About