Bombay Tools Center Bombay Pvt Ltd

Shot And Grit-blasting Comparators

These two comparators are specially designed to check the roughness of steel surfaces which have been blast cleaned to cleanliness grades sa 2. 5 and sa 3 before painting. They conform to iso 850.

Our expert team assists us in offering a diverse range of surface comparator elcometer that is elcometer 125 surface comparator. It permits the estimation of surface roughness by both sight and touch. These are available in both shot and grit metric units only. In order to use it effective and proper preparation of surface even before coating is important. Make sure that the accurate profile or roughness has been generated. In case if the profile is too low it will reduce the coating to the surface on the other hand if the profile is too high then there will be danger that even leads to uncoated profile peak allowing rust spots to occur.

Available in both grit and shot
Metric units only

Surface Profile
The proper and effective preparation of a surface prior to coating is essential. Making sure that the correct roughness – or profile – has been generated is essential.

If the profile is too low, the adhesion of the coating to the surface will be reduced. Too high and there is the danger that the profile peaks will remain uncoated – allowing rust spots to occur.
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Testex Tape / Press-O-Film USA

Testex Tape is popularly called as Press-O-Film. Press-O-Film provides surface profile of a basted cleaned surface. It can produce virtually exact replicas of the blasted surface profile, which can be measured, using a snap gauge. Testex tapes offers a simple and very accurate method of measuring blasted profiles of surface.

Testex Tape / Press O Film consists of layer of crushable plastic microfoam coated onto a polyster film of highly uniform thickness.

Surface profile gauge or testex tapes can test surface roughness. Most commonly used testex tapes / press o films are popular as it can give permanent record of the surfaces.

Place the Testex Tape (Press-O-Film) firmly on the blasted surface, apply moderate pressure with the burnishing tool, the replica has now been taken and can be measured using the snap gauge. Testing & Inspection can be done in three easy steps. Detailed procedure is furnished with testex kit or tapes.

Testex Tape is supplied in a roll containing 50 tests and is available in four different grades to cater for different applications. The snap gauge is supplied in a carrying case with a burnishing tool.

Paint applicators, inspectors and researchers for its simple operations and results prefers to use Testex tapes (Press-O-Film)

Testex Tape (Press-o-film) complies with ASTM, NACE and SSPC methods measurement.

ASTM- Reproducibility is given in ASTM Standard 4417-93 for both “X-coarse” and “coarse” grade replica tape.

NACE- Standard RP0287-95 addresses the issue of accuracy of measurement, test results.

SSPC- The Society for Protective Coatings, recommends a minimum of three measurements of profile per 100 square feet (10 square meters).

ISO- International Organization for Standards- Draft Standard ISO8503-5 describes preparation of steel substrates before application of paint and related products.