MIL-STD-867 Temper Etch InspectionThis standard establishes requirements and test for performing temper etch inspection of carburized steels and tool and low alloy steels, which are heat treated above 1.24 x 109 Pascal PA 1.26 x 102 kilogram - force/square millimeter Kgf/mm2 or 1.8 x 105 pound - force/square inch psi. This standard applies to aircraft and missiles structural and propulsion system components when MIL-HDBK-6870 for guidance only and/or MIL-STD-866 are reference documents in the solicitation or contract.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16

MIL-STD-867C

SAE-ARP 1923           Qualification and Certification of Etch Inspectors

(Copies of these documents are available online at www.sae.org or from the Society of

Automotive Engineers International, 400 Commonwealth Drive, Warrendale, PA  15096-

1001.)

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM - D329             Acetone

ASTM - E1146           Acid, Muriatic, (Technical Grade) Hydrochloric Acid

ASTM - E1444           Particle Testing, Magnetic

(Copies of these documents are available at www.astm.org or ASTM International, 100

Barr Harbor Drive, P.O. Box C700, Wes Conshohocken, PA 19428-2959.)

2.4   Order of precedence.   In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.   DEFINITIONS (Not applicable.)

4.   GENERAL REQUIREMENTS

4.1   Materials and equipment.

4.1.1   Materials.   The use of reclaimed materials shall be encouraged to the maximum extent possible.   Materials required are as follows:

a.   Ethyl alcohol (27CFR 21.35, Formula 3-A) or methyl alcohol. b.   Hydrochloric Acid (HCL), (ASTM - E1146)

c.   Nitric Acid (HNO3), (A-A-59105)

d.   Sodium Hydroxide (NaOH)

e.   In lieu of (d) above, any common alkali solution with a pH greater than or equal to 10 may be used.

commercial.

f.   Ammonium Peroxydisulfate (Ammonium Persulfate) (NH4) 2S208

4.1.2   Equipment.

system.

a.   A commercial industrial vapor degreaser or a hot alkaline cleaning

3