Bonded Grinding Wheels
(a) Vitrified bonded grinding wheels
It is generally known in the industry that under ideal storage conditions, a vitrified bonded grinding wheel has an almost infinite shelf life. However, the opportunity for damaging a wheel in storage increases with time and it is therefore recommended that stock be rotated to use the oldest wheels first. Any recommended shelf life provided by an individual manufacturer will supersede this recommendation.
(b) Organic bonded grinding wheels
Unlike vitrified bonded grinding wheels, some organic bonded wheels do have a limited shelf life. The opportunity for damaging a wheel in storage increases with time and it is therefore recommended that stock be rotated to use the oldest wheels first. Refer to manufacturer for specific recommendations. Any recommended shelf life provided by an individual manufacturer will supersede this recommendation.
Coated Abrasive Discs and Belts
Coated abrasive products stored under proper conditions should retain their efficiency, usefulness and remain safe for a reasonable period of time. A “reasonable” time is very difficult to define, but in all cases, the oldest product should be consumed first. Coated abrasive products may contain some organic materials and will degrade with time. It is recommended that coated abrasive belts and discs be consumed within 10 years from the date of manufacture. This recommendation assumes that coated abrasive products have been stored under ideal conditions. Information on ideal storage conditions is located in the safety guide included with each box of coated abrasive discs and belts sold.
It may be true that under ideal storage conditions coated abrasive products can survive without any degradation in strength for well over ten years. However, it is always wise to suspect any product over ten years old. If the coated abrasive products are stored under less than ideal conditions, they may have a much shorter shelf life depending upon the severity of storage conditions. Coated abrasive products that appear brittle, curled or damaged are suspect and must not be used. Inspect all belts (including the joints) prior to use. If the belt appears discolored, or the joint can be pulled apart, do not use it. Any suspect product must be destroyed to prevent accidental use.