The Boeing Company
P.O. Box 3707
Seattle, WA 98124-2207
December 1, 2000
BTS #6890
Contract #6-1171-10A6890
Mr. Robert Vitale
Midwest Industrial Supply, Inc.
1101 3rd Street SE
Canton, Ohio 44707
Phone: (330) 456-3121
Fax: (330) 456-3247
Dear Mr. Vitale:
Midwest’s EK35 product has been confirmed by Boeing-performed testing to meet the Boeing Specification D6-17487, Evaluation of Aircraft Maintenance Materials. EK35 will be non-injurious to aircraft surfaces whenused as a stabilizing agent and dust suppressant as specified by Midwest Industrial Supply, Inc.
Sincerely,
The Boeing Company
Acting through
BOEING TECHNOLOGYLICENSING & SERVICES
Kenneth J. Cooper
Contracts & Licensing Manager
SR 10135 Date: 26 September, 2000
To: Bob Renz 19-JL
cc: Matthias Schriever 73-40
David Pollock 73-40
Eric Barta 73-40
Subject: Evaluation of Midwest Industrial’s EK35 Product in Accordance with D6-17487
“Evaluation of Airplane Maintenance Materials” for Possible Use as a Dust
Suppressant for Unimproved Runways
ABSTRACT
Midwest Industrial Supply, Inc.of Canton, Ohio supplied BTS with a sample of their EK35product for evaluation. They requested that four tests be run in accordance with D6-17487“Evaluation of Airplane Maintenance Materials” for possible use as a dust suppressant forunimproved runways. The tests were Sandwich Corrosion, Acrylic Crazing, PaintSoftening and Hydrogen Embrittlement. Note: This testing was carried out to the intent ofD6-17487 Sections 2 a and b. This is not material qualification.
All tests passed.
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SR 10135
PURPOSE:
To evaluate Midwest Industrial’s EK35 material in accordance with Reference (c) forpossible use as a dust suppressant on unimproved airfields. Note: This testing was carriedout to the intent of Reference (c), Sections 2a and b. This is not a material qualification.
TEST PROCEDURE:
The tests required by References (a) and (b) are as follows:
- Sandwich Corrosion
The Sandwich Corrosion test was performed in accordance with Reference (g) with themodifications specified in Reference (c). - Acrylic Crazing
The test was performed in accordance with Reference (d) using Type C acrylic stressedto an outer fiber stress of 4500 psi. - Paint Softening
Paint Softening was performed in accordance with Reference (e). - Hydrogen Embrittlement
The test was performed in accordance with Reference (f) using 3 type 1a.2 specimensand loaded for 150 hours at 45% of ultimate stress.
TEST RESULTS:
Test results are shown in Table I, below.
All tests passed.
The following are the criteria of passage for each specific test:
- Sandwich Corrosion
When tested in accordance with Reference (g) with the modifications specified inReference (c), the material, when compared with a distilled water control, shall exhibitno corrosion in excess of that control.
- Acrylic Crazing
No crazing, cracking or etching after 8 hours of exposure in accordance with Reference(d) using Type C acrylic stressed to an outer fiber stress of 4500 psi.
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SR 10135
- Paint Softening
The material, tested in accordance with Reference (e) shall not produce a decrease infilm hardness greater than 2 pencils, or any discoloration or staining. The order ofpencil hardness in accordance with Reference (e) is the following: 6B, 5B, 4B, 3B, 2B,B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H.
- Hydrogen Embrittlement
When tested in accordance with Reference (f) using type 1a.2 specimens, the materialshall not cause a specimen to break within 150 hours of loading in stress.
| Table 1 | Midwest | EK35® | |||
| Sandwich Corrosion | Cladd | Pass | Pass | ||
| CAA | Pass | Pass | |||
| Acrylic Crazing | Pass | Pass | Pass | ||
| Paint Softening | BMS 10-11 | Wet | 5H | 5H | 5H |
| Dry | 5H | 5H | 5H | ||
| BMS 10-100 | Wet | 3H | 3H | 3H | |
| Dry | 3H | 3H | 3H | ||
| Hydrogen Embriddlement | Pass | Pass | Pass |
REFERENCES:
- (a) WR# 200001238 “Dust Suppressant”
- (b) BTS Job #3530 “Midwest Industrial Supply - EK35”
- (c) D6-17487 Rev. N “Evaluation of Airplane Maintenance Materials”
- (d) ASTM F 484 “Standard Test Method for Stress Crazing of Acrylic Plastics in
Contact with Liquid or Semi-Liquid Compounds” - (e) ASTM F 502 “Standard Test Method for Effects of Cleaning and Chemical
Maintenance Materials on Painted Aircraft Surfaces” - (f) ASTM F 519“Standard Test Method for Mechanical Hydrogen Embrittlement
Evaluation of Plating Processes and Service Environments” - (g) ASTM F 1110“Standard Test Method for Sandwich Corrosion Test”
| Boeing Evaluation Letters | |||||
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| Boeing.pdf | |||||
