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D14AC - Test Method and Limits for Bow Height of Sheet Samples after Chemical Milling

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Document Number: D14AC
Project Initiation: 04-15-2014
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Sponsor Name: Rebecca K. Wyss
Title
Test Method and Limits for Bow Height of Sheet Samples after Chemical Milling
Scope
1.1 This specification is used to indicate the resistance to distortion of bare and two-side Alclad, flat sheet aluminum that will be chemically milled (often in the manufacture of aircraft skin panels). 1.2 This specification is intended for bare and two-side Alclad aluminum alloy in the T temper, which is the form of flat sheet having a thickness between 0.032 to 0.249 in. (0.8 to 6.3 mm). 1.3 Product having the capability prescribed by this specification is available in limited quantities and tempers because of the special processing required.
Rationale
This AS defines the test method and limits for the bow height of sheet samples after chemical milling. The results of this test are intended to be a useful indication of the resistance to distortion of bare or Two-Side Alclad, flat sheet aluminum used in chemical milling applications. This AS applies only to heat treated, flat sheet in the T (T3X, T6X, T7X, or T8X) temper. Purchasers are encouraged to contact producers with questions on the availability of material (i.e. alloy/temper/width) that is capable of meeting the requirements of this standard. Note: Sheet in the coiled form cannot be supplied to this specification. Bow limits provided in Table 1 are based on statistically analyzed data.
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