The ISO Surface Roughness Comparator is a precision Nickel Comparator Plate that conforms to International Standard ISO 8503 and ASTM D4417 for grit and shot-blast surface roughness comparison measurement.

When steel has been blast-cleaned, the surface consists of random irregularities with peaks and valleys that are not easily characterised. Experts have recommended that the profile should be identified as dimpled (shot-blast) or angular (grit-blast), and that they should be graded as Fine, Medium or Coarse with each grade being defined by limits specified in ISO 8503. These characteristics are considered to give sufficient distinguishing features for most painting requirements.

Easy to use, place the Comparator against an area of the test surface. Compare in turn the four sectors of the Comparator against the test surface using the x10 Illuminated Magnifier, placed so that the test surface is viewed simultaneously with a segment of the Comparator. The nearest profile to the Comparator determines the grade.

The different grades are defined as follows: 

Fine-grade profiles equal to segment 1 and up to but excluding segment 2;

Medium-grade profiles equal to segment 2 and up to but excluding segment 3;

and Coarse-grade profiles equal to segment 3 and up to but excluding segment 4.

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The ISO 8501-1 Swedish Standard Rust Grade Book contains reference photographs representative of different rust grades and preparation grades that are used to specify the quality of surface preparation.

The Rust Grade Book identifies four levels (designated as rust grades) of mill scale and rust that are commonly found on surfaces of uncoated erected steel and steel held in stock. It also identifies certain degrees of visual cleanliness (designated as preparation grades) after surface preparation of uncoated steel surfaces and of steel surfaces after overall removal of any previous coating. These levels of visual cleanliness are related to the common methods of surface cleaning that are used prior to painting.

Intended to be a tool for the visual assessment of rust grades and of preparation grades, it includes 28 representative photographic examples.

Contains high quality colour pictures of the blast-cleaning surface grades of Sa1, Sa2, Sa2.5 and Sa3, together with detailed descriptions.

Translates into English, French, German and Swedish.

Complies With International Standards: ISO 8501-1 and SIS SS 05 59 00.

Prepared by ISO (International Organization for Standardization).

Assess surface profile depth (generated by abrasive blast cleaning) quickly and easily with these durable 3" reference discs.

The blast cleaned surface is visually compared to five segments on the reference disc through a hand held illuminated magnifier. Three reference discs are available; the disc selected is based on the abrasive used to prepare the steel surfaces. Reference disc choices include one for surfaces prepare with sand, one for surfaces prepared with steel shot and a third for surfaces blast cleaned with a grit or slag abrasive. Each disc is a high purity nickel electro-formed copy of a master disc duplicated to within +/- 50 microinches.

Conforms to ASTM D4417, Method A.

• Sand Surface Comparator    : 0.5, 1.0, 2.0, 3.0, 4.0 mils
• Grit Surface Comparator      : 1.5, 2.0, 3.0, 4.5, 5.5 mils
• Shot Surface Comparator    : 2.0, 2.5, 3.0, 4.0, 5.5 mils
• Illuminated magnifier (x 5) with integrated surface comparator holder

• Rubert Grit Surface Comparator                    0.4, 0.8, 1.6, 3.2, 6.3, and 12.5µm
• Rubert Shot Surface Comparator                  0.4, 0.8, 1.6, 3.2, 6.3, and 12.5µm
• Rugotest Shot & Grit Surface Comparator     N6, N7, N8, N9, N10 and N11 equivalent to 0.8, 1.6, 3.2, 6.3, 12.5, and 25µm roughness averages respectively

Pipe Pit Gauge

• Range is 0 to 1/2" in 1/64" & .020 Increments,
• Arm Can be Locked in Place at Any Dimension,
• All Stainless Steel
• Gauge fits in shirt pocket and comes with pocket protector.
• Pipe Pit Gauge has handy formulas on front and decimal equivalents on back
• Order Code : GAL 17