Opto 22

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KB86264
Cracking on SNAP PAC or SNAP TEX plastic rack extrusions
Revision:  1.0
Published:  9/23/2016
Applies To
SNAP-PAC-RCK4
SNAP-PAC-RCK4-FM
SNAP-PAC-RCK8
SNAP-PAC-RCK8-FM
SNAP-PAC-RCK12
SNAP-PAC-RCK12-FM
SNAP-PAC-RCK16
SNAP-PAC-RCK16-FM
SNAP-TEX-FB16-L
SNAP-TEX-FB16-H
SNAP-TEX-MR10-16C
SNAP-TEX-MR10-16
SNAP-TEX-MR10-4
SNAP-TEX-32
SNAP-AIMA-HDB
SNAP-AIMA-HDB-FM
SNAP-AIV-HDB
SNAP-AIV-HDB-FM
SNAP-UDC-HDB
SNAP-IDC-HDB
SNAP-IDC-HDB-FM
SNAP-ODC-HDB
SNAP-ODC-HDB-FM
SNAP-UDC-HDB-G4
SNAP-SCM-BB4
Versions
Applies to all versions  

SYMPTOMS

When panel mounted, small hairline crack(s) may form on the plastic rack holder of a SNAP PAC mounting rack or SNAP TEX breakout board. The crack may form next to screws used to mount the rack directly to a panel if there is cutting fluid residue (or other chemical residue) on the backplane the rack is mounted to. Over weeks, months, or years these cracks can "creep."  This is typically not an issue when the racks are DIN-rail mounted.

This issue can occur when the plastic rack holder has come in contact with chemicals in cutting fluids, cleaners, lubricants, or other products. When these chemicals contact plastic, Environmental Stress Cracking (ESC) may occur. See: https://en.wikipedia.org/wiki/Environmental_stress_cracking

RESOLUTION

Do not let cutting fluids, cleaners, lubricants, or other chemicals contact the plastic extrusion. If you use these chemicals on the backplane the rack will be mounted to before rack installation, be sure they are thoroughly cleaned off.

Relevant Downloads
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Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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This Opto 22 Knowledge Base ('OptoKB') article is intended to provide general technical information on a particular subject or subjects and is not an exhaustive treatment of such subjects. Accordingly, the information in this OptoKB article is not intended to constitute application, design, software, or other professional engineering advice or services. Opto 22 may modify the OptoKB articles at any time. Before making any decision or taking any action which might affect your equipment, you should consult a qualified professional.

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