**Exhibit 10.13**

 

Mistras Group, Inc.

Compensation Plan for Non-Employee Directors

June 2011

 
| Eligible   Participants:  |   | Members   of the Mistras Group Board of Directors who are not employees of the Company.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Annual   Retainer:        |   | $30,000   per year, payable quarterly at the beginning of each fiscal quarter,   beginning the first quarter of fiscal 2012.

 

This   amount will be paid in cash, but a director may elect to receive this   retainer in Company common stock, to be granted under the Mistras 2009   Long-Term Incentive Plan (“LTIP”), rather than cash.                                                                                                                                                                                                                                                                                                                                                                                      |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Committee   Chair Fees:   |   | Committee   Chairperson of the following committees shall receive the annual fees set for   the below, which shall be paid quarterly with the annual retainer:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|                      |   | Audit   Committee: $10,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|                      |   | Compensation   Committee: $7,500                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|                      |   | Corporate   Governance Committee: $7,500

 

This   amount will be paid in cash, but a director may elect to receive these fees   in Company common stock, to be granted under the LTIP, rather than cash.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Annual   Equity Awards:   |   | $40,000   of Company common stock, to be granted under the LTIP. This award will be   made as soon as possible following the annual shareholders meeting.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Dates   of Equity Awards: |   | All   equity awards will be granted during an open trading period and, unless   circumstances require otherwise (as determined by the Company’s General   Counsel), will be made on the first day of trading during an open trading   period pursuant to the Company’s Insider Trading Compliance Policy.                                                                                                                                                                                                                                                                                                                                                                                                                               |
|                      |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Pro   Rata Awards:        |   | If   a director is elected to the Board other than at an annual meeting, the   director will receive a pro rata portion of director compensation for that   year. For the retainer and committee chair fees paid quarterly, the payment   during the quarter in which the director is elected will be prorated based   upon the number of months in the quarter the director serves on the Board. In   the case of the annual equity award, the award will be prorated based upon   the number of months remaining before the expected date of next annual shareholders   meeting, but excluding the month of the next annual shareholders meeting. The   month in which the director is elected to the Board will be considered a   whole month. |

 

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