Aerospace composites are one of the few materials families where the clock is part of the specification. Renegade Materials, which manufactures high-performance prepregs, resins and adhesives for the aerospace industry, has deployed a RAIN RFID system from Xemelgo to automate the record of how long its temperature-sensitive materials spend outside the freezer, replacing paper logs and manual keying with reads captured at doorways and freezer entrances.
Why out-time is a quality parameter, not paperwork
Prepreg is reinforcement fabric already impregnated with partially cured resin. It is kept frozen because the resin keeps advancing at ambient temperature, and the cumulative time a roll spends out of the freezer, usually called out-time, is a controlled parameter tied to whether the finished laminate will meet spec. Renegade says each of its materials carries its own thermal exposure limits, so there is no single site-wide rule an operator can memorise. With hundreds of items in circulation, each with a different allowance, this is a scale problem rather than a discipline problem.
According to the case study, teams across shipping, engineering, quality and production were between them recording more than 100 material transactions a day by hand. Materials also moved between multiple production areas and freezers with no automatic capture of that movement, so thermal exposure history had to be reconstructed rather than simply read off.
Inferring exposure from portal reads, not from sensing it
This is the distinction that matters technically, and it is worth being precise about. Xemelgo’s deployment as described is not temperature sensing. There are no battery-assisted or sensor tags in the picture. Passive UHF tags are applied to incoming raw materials and finished goods, fixed readers sit at freezer, production and warehouse access points, and the platform infers out-of-freezer time from the timestamps of those portal crossings. A material read leaving the freezer starts accruing exposure, and a read going back in stops it.
That design is cheaper and far easier to maintain than a sensor-tag estate, and for a controlled-out-time regime it answers the question the quality system actually asks. The trade-off is that the entire audit trail rests on portal read reliability. A missed read on the way back into the freezer does not just lose one data point, it leaves an item apparently accruing out-time it never accrued. Read rate at the portal is the whole system.
The hardware, and why it is UHF
Renegade’s site runs Impinj R700 and Impinj Speedway R420 fixed readers, both RAIN RFID (UHF, ISO 18000-63) devices. The R420 is the older generation and the R700 is its successor, so a site running both is a perfectly normal staged upgrade rather than a mismatch, with newer portals going in on current silicon while proven installations carry on until they are due for replacement.
UHF rather than HF or NFC is the obvious call here. Portal capture needs several metres of range and the ability to read a whole pallet or trolley of items as it passes, which is exactly what RAIN RFID does and exactly what near-field technologies cannot do. Tag reading in this application is opportunistic and hands-free by design, because the moment anyone has to present an item to a reader, you are back to a manual transaction.
On the peripheral side, a Zebra ZT411R RFID printer handles encode-and-print at receiving. That is a more important part of the system than it sounds, because it is the point at which raw material gets an identity and enters the platform at its first touchpoint. Everything downstream inherits whatever quality that first encode achieved. A Zebra MC3330xR handheld covers the gaps that fixed infrastructure does not reach, principally locating a specific item and cycle counting, where an operator wants to sweep an area rather than wait for something to cross a portal.
Freezer portals are a hostile RF environment
Anyone planning something similar should be clear that a freezer doorway is one of the harder places to get a consistent read. Metal-lined chambers and metal racking produce strong reflections and multipath, which gives both nulls and unexpected read zones. Condensation and frost on tags and labels attenuate the signal, and water forming on a label as an item comes back into a warm room is not a trivial detuning effect. On top of that, the label stock and adhesive have to survive repeated cycling between deep-freeze and ambient conditions without lifting or cracking. In deployments like this, tag and label selection, plus antenna placement and power tuning at the portal, usually determine success more than the choice of reader does.
Where the admin burden actually goes away
The integration with Epicor ERP is the part that removes the manual effort rather than merely relocating it. Reads become transactions in the system of record automatically, so material consumption is recorded as it happens instead of being written down and keyed in later. Without that link, an RFID deployment tends to produce a second, parallel set of data that someone still has to reconcile against the ERP.
The numbers Renegade and Xemelgo report
The figures come from the vendor case study rather than independent measurement, and are best read as the customer’s own account. Renegade reports more than $100,000 in reduced scrap risk from having accurate out-of-freezer records, and says retrieval of temperature logs is around 95 per cent faster, with searches that previously took roughly 30 minutes now returning in seconds. The case study also credits the system with returning more than five hours to the team through automated search and audit tools, and with eliminating over 100 manual log entries a day.
Steve Hoffman, operations manager at Renegade Materials, is quoted saying that “Xemelgo gives us better information with less administrative effort, while providing a system that can scale with our growth.” He adds: “With Xemelgo, we can track how long anything sits anywhere, analyze production flow, and trace a quality issue back to exactly where it began.”
That last point has the longest reach. Once every movement is timestamped against a serialised item, the same data that proves out-time compliance also supports dwell-time analysis and root-cause tracing on a quality escape. In a sector where an auditable material history is not optional, getting that history as a by-product of normal movement is a fair argument for the infrastructure.
Read more at https://xemelgo.com/resources/renegade-materials
