General Information

Troemner Alloy 8 Stainless Steel Precision Metric Weights are available in Troemner UltraClass, and ANSI/ASTM E617 Classes 0, 1, 2, 3 and 4. Troemner Alloy 8 Stainless Steel Precision Avoirdupois Weights are available in ANSI/ASTM E617 Classes 1, 2, 3, and 4. ANSI/ASTM Class weights meet or exceed specifications as defined in the ANSI/ASTM E617 standard. The weights are manufactured of the finest stainless steels available including Troemner Alloy 8 Stainless Steel, which was developed by Troemner and is available exclusively through Troemner. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion. It is the finest grade of stainless steel available and is similar to material originally specified in the manufacture of state primary standards.

Weight specifications are designed so the specifications on surface finish, markings, construction, material density and magnetic properties get more restrictive as the weight tolerances get smaller in order to enable the weight to maintain its tolerance over time. These weights are designed for your most demanding weighing applications.

**Caution** Class 0 weights have extremely small tolerances and are intended to be used as primary reference standards with direct traceability to national reference standards. They should be used in extremely stable environments and handled with the highest level of care. Otherwise, due to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class. One may be tempted to purchase the weights with the tightest tolerances in order to reduce measurement uncertainty. However, frequency of use, care, handling and environmental conditions all play a major role in the long term stability of weights and these factors should be considered before purchasing Class 0 weights.

Why UltraClass?

Troemner UltraClass weights are the most precise two-piece weights available with weight tolerances 50% greater than ANSI/ASTM E617 Class 1 tolerances. Troemner UltraClass weights combine high precision with the advantage of two-piece construction (1g and larger) avoiding costly replacement issues associated with one-piece weights.

Tolerance Classes

ANSI/ASTM E617 Classes with small numerical designations represent smaller tolerances. Troemner UltraClass weight tolerances are 50% better than ANSI/ASTM E617 Class 1. Please see the Tolerance Chart within the Mass Standards Handbook for the specific tolerances of each weight in any given class.

Construction and General Shape

The Sheet Metal Weights come standard with the weight products. To order Milligram Wire Weights, specify the Troemner part number followed by "-WIRE".

Surface Finish

All surfaces are polished to a perfect, mirror-like finish and conform to specifications in ANSI/ASTM E617.

Suggested Applications

Material Specifications for Class 0 weights

**30 mg weights are aluminum

Material Specifications for Troemner UltraClass, Classes 1, 2, 3 and 4

**30 mg weights are aluminum

Presentation

**Caution** Weight cases are not intended to be used as shipping containers. When you ship your weights to be calibrated, the weights and weight sets must be overpacked in larger containers and/or cartons to protect your weight cases.

Troemner Alloy 8 Metric Stainless Steel Precision Weights, ANSI/ASTM E617 Class 0