IRM-021 Stearic Acid

ARDL offers for sale Industry Reference Material IRM-021 Stearic Acid used to prepare reference compounds for control testing.

Evaluation of this IRM

This lot of stearic acid is a Local AR-value IRM. It was produced in June 1998 by Henkel Corp. and the blending was done by Akron Dispersions, Inc. Homogeneity testing was conducted via the procedures as outlined in ASTM D 4678 Annex A.3 on the basis of Acid Number analysis via ASTM D1980-91, for eight individual samples taken from the beginning to end of the lot production. The lot was declared to be homogeneous using the procedure as outlined in Annex A.3. The Local AR-value for Acid Number as obtained for the homogeneity testing is given below. Two secondary properties, Iodine Number and heavy metal content were deemed important and an analysis was conducted for Iodine Number via ASTM D1959-89 and for heavy metal content via ICP Atomic Absorption on a composite stearic acid sample obtained by blending all individual homogeneity samples.

Local AR-value

Acid Number (D1980-91) +/- 3s= 194.36 +/- 0.38

Secondary Property

Iodine Number (D1959-89) +/- 1s= 0.56 +/- 0.29

Heavy metals (Co, Cu, Fe, Mn, Ni, Zn) Each less than 10 ppm

(The 3 s limits are based on 15 DF; 1 s limits are approximate, 3 DF)

Supplementary Information

Store this IRM in a cool dry location; it is expected to remain stable for a period of five years. A full ‘Research Report’, documenting all the analysis for this IRM, is on file at ASTM Headquarters, 100 Barr Harbor Dr., W. Conshohocken PA, 19428 USA.

Ordering IRM-021 Stearic Acid

This IRM is available for purchase in the following way:


  • IRM-021 Stearic Acid, 3200 grams per carton
  • 1 Carton containing 4 bags (800 grams each)
  • Contact us for pricing.

Domestic shipments can be made within 48 hours of receipt of purchase order. International shipments can be made within 48 hours of receipt of funds in US currency. Wire transfer, Mastercard/VISA also accepted.

* ASTM Committee D11 – Rubber and Rubber Products ‘Document Sheet’ for Industry Reference Material IRM-021 Stearic

If you are interested in purchasing Stearic Acid, please contact ARDL via email or by phone at (866) 778-ARDL or (330) 794-6600.

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