Wiring Harness News May-Jun 2022 - Page 59

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INDUSTRIAL INFO-TAINMENT Wiring Harness News MAY / JUNE 2022 59
dimensional life is important to consider , anyone who has had to fit a wire bundle through an undersized heat shrink tubing will say otherwise . Typically , specific parts will be identified for harness build fabrication . If the tubing does not fit , there are two likely actions :
1 . consult engineering about the defect , or more likely
2 . use the next larger size of heat shrink tubing .
Putting numbers behind option # 2 , if a M23053 / 7-111C replaces a M23053 / 7-110-C ( 1.050-inch and 0.963-inch inner diameter , respectively ), this adds 9 % more heat shrink weight . Slowly , this additional 9 % stealthily erodes weight budgets and is a hidden cost of not addressing heat shrink tubing dimensional life .
In Summary All things have their limits , heat
shrink tubing is no exception . The latest revision of AS23053 includes information on this and should be considered when selecting heat shrinking procurement type and quantity .
Contact Lectromec with any questions regarding the dimensional life of your heat shrink tubing . Our ISO 17025 accredited lab is happy to offer consultation for the selection of components in your application .
About Lectromec :
Lectromec has been a leader in wires and wire interconnect systems since 1984 and has provided expertise to the aerospace industry , both military and commercial . They help organizations worldwide improve the safety and readiness of their air fleet and reduce the costs associated with aircraft maintenance .
Figure 1 : The figure shows the cross-section of a sample of heat shrink tubing both before and after unrestricted shrinkage . To verify the dimensional life of the sample at any time , a measurement of inner diameter is recorded followed by unrestricted oven shrinkage of the sample . After the shrinkage , the inner diameter is re-measured and the wall thickness is measured .
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