01
Leaving change notification to the relationship
A supplier who switches species or fastener without telling you has invalidated a validated process.
FixPut change control in the agreement, not in the goodwill.
01The classified-space line
The practical dividing line in most pharmaceutical facilities is whether the space is classified. Inside — cleanrooms, sterile fill, controlled compounding — wood is excluded because it sheds fibre and cannot be sanitised to a validated standard. Outside, in the warehouse and distribution operation, wood is normal and widely used.
| Zone | Pallet | Rationale |
|---|---|---|
| Classified / cleanroom | Plastic, smooth deck, autoclavable where required | Particulate control and sanitisation |
| Airlock / transfer | Plastic, dedicated to the zone | No cross-contamination |
| Controlled warehouse | Kiln-dried wood, documented | Cost-effective, moisture controlled |
| Ambient distribution | Grade A recycled or new | Standard logistics |
| Export | Heat treated and IPPC marked | ISPM-15 compliance |
02Documentation you should be able to produce
- Written pallet specification — dimensions, tolerance, moisture, treatment, appearance criteria.
- Supplier declaration against that specification per delivery.
- Moisture certificate for kiln-dried stock.
- Heat treatment records where applicable, with charge numbers.
- Change control — the supplier tells you before changing anything material.
- Traceability back to a defined source, which unsorted core buying cannot provide.
03Dimensional consistency for validated automation
Pharmaceutical warehouses are heavily automated and heavily validated. A revalidation triggered by a pallet dimension change costs vastly more than the pallets. Recycled stock at ±0.5 to ±1.0 inch is fine in a manual warehouse and unsuitable in a validated AS/RS commissioned at ±0.25 inch.
Where automation is involved we specify new builds or plastic, hold the spec under change control, and keep a documented buffer stock so a supply gap never forces an unvalidated substitution.
By the numbers
The figures worth remembering
Four numbers that decide most of what follows on this page.
- Tolerance validated automation expects
- ±0.25 inTolerance validated automation expects
- Documented moisture for kiln-dried stock
- ≤19%Documented moisture for kiln-dried stock
- Wood permitted in classified cleanroom space
- 0Wood permitted in classified cleanroom space
- Clause everyone forgets — change control
- 1Clause everyone forgets — change control
Rules of thumb
Carry these in your head
- 01The dividing line is classified space, not a general prejudice against wood.
- 02A revalidation costs vastly more than the pallets.
- 03Change control is the clause people forget and regret.
- 04Traceability rules out unsorted core buying.
Before you order
The decisions we will ask you to make
A quote turnaround is limited by how many follow-up questions we have to ask. Working through this list removes nearly all of them.
- 01
Map the classified boundary
Inside classified space, plastic. Outside it, documented wood is normal and widely accepted.
- 02
Written specification
Dimensions, tolerance, moisture, treatment, appearance.
- 03
Per-delivery declaration
Evidence against that specification, every time.
- 04
Moisture certificate
For kiln-dried stock where a customer or regulator requires it.
- 05
Change control clause
The supplier tells you before changing species, fastener or board thickness.
- 06
Documented buffer stock
So a supply gap never forces an unvalidated substitution.
What goes wrong
Expensive mistakes, and the fix for each
Every one of these turns up in ordinary purchase orders. All of them cost multiples of whatever they appeared to save.
02
Using recycled stock in a validated AS/RS
Recycled runs ±0.5 to ±1.0 in. A system commissioned at ±0.25 in will jam.
FixNew builds or plastic, held under change control.
03
Buying unsorted cores anywhere in the chain
GDP-aligned operations need supplier traceability, which core buying cannot provide.
FixBuy to a specification from a supplier who can document the source.
Side by side
Pallet by zone
| Zone | Pallet | Rationale |
|---|---|---|
| Classified / cleanroom | Plastic, smooth deck | Particulate control and sanitisation |
| Airlock / transfer | Plastic, dedicated to the zone | No cross-contamination |
| Controlled warehouse | Kiln-dried wood, documented | Cost-effective, moisture controlled |
| Ambient distribution | Grade A recycled or new | Standard logistics |
| Export | Heat treated and IPPC marked | ISPM-15 compliance |
Against our interest
When this is the wrong answer
We would rather lose the order than sell you the wrong thing. These are the situations where this page is not what you need.
- 01
Wood inside classified cleanroom space
It sheds particulate and cannot be sanitised to a validated standard. The boundary is the classification, not a general prejudice.
- 02
Recycled stock in validated automation
Recycled runs ±0.5 to ±1.0 in against the ±0.25 in a commissioned AS/RS expects. A revalidation costs vastly more than the pallets.
- 03
Unsorted core buying anywhere in the chain
GDP-aligned operations need supplier traceability, and cores by definition have none.
What moves the price
Cost drivers, and roughly how much each one is worth
A quote is not a list price with a discount applied. It is these variables added up, which is why two quotes for nominally the same thing can differ so widely.
| Driver | What it is | Rough effect |
|---|---|---|
| Material by zone | Plastic inside classified space, documented wood outside it. | 5–15× on the plastic portion |
| Documentation burden | Specification, per-delivery declarations, moisture certificates and change control. | Administrative, and non-negotiable |
| Dimensional tolerance | New builds or plastic held under change control. | New is 2–3× recycled |
| Buffer stock | Held so a supply gap never forces an unvalidated substitution. | Carrying cost, cheaper than revalidation |
Due diligence
Questions to ask any supplier
Us included. The answers tell you a great deal, and so does how quickly they arrive — a yard that has these documents ready is a yard that has thought about them.
- 01
“Where exactly does our classified boundary sit, and is the pallet spec mapped to it?”
- 02
“Will the supplier notify us before changing species, fastener or board thickness?”
- 03
“What moisture content is certified, and by what method?”
- 04
“What tolerance is guaranteed, and how is it verified per delivery?”
- 05
“What buffer exists so a gap never forces a substitution?”
The rulebook
Standards and authorities that actually apply
Plenty of pallet marketing invokes standards loosely. These are the real documents behind this subject, and what each one does and does not cover.
- EU GDP guidelines
Good Distribution Practice for medicinal products, covering storage and transport conditions and supplier qualification.
- 21 CFR Part 210 / 211
FDA current good manufacturing practice for finished pharmaceuticals, which drives cleanroom material controls.
- ISO 14644
Cleanroom classification. Determines where wood is excluded and what particulate control is required.
- Change control
Not an external standard but a contractual clause. A supplier who changes the build without notice has invalidated a validated process.
Put it in the agreement, not the relationship.
Vocabulary
The terms used on this page
Defined the way the trade uses them, not the way a dictionary would.
- Kiln dried (KD)
- Lumber dried in a controlled kiln to a specified moisture content, typically ≤19%. Not the same as heat treatment, though the processes overlap.
- Grade A
- Our top recycled tier: no companion stringers, two or fewer replaced deck boards, one plug maximum, squareness within 0.5 inch.
- ISPM-15
- International Standard for Phytosanitary Measures No. 15, governing treatment of solid wood packaging crossing international borders.
- Racked load
- The weight a pallet carries spanning two rack beams with nothing beneath the centre. Always the lowest of the three load ratings.
From the journal
Longer reading on this subject
Written by the people who grade, repair and haul the wood — including the articles that argue against buying from us.
Industry6 min readPriya Raghunathan
What a pallet audit finding looks like in a food plant
There is no such thing as an FDA-certified pallet. What exists is your documented control, and an auditor is testing whether you have one.
Read
- food safety
- audit
- specification
Compliance6 min readPriya Raghunathan
Heat treatment records, and the day a border agency asks
The mark on the wood is the declaration. The record behind it is the evidence. Most of the time nobody asks for the second one, and then somebody does.
Read
- ISPM-15
- records
- audit
Materials6 min readDana Whitfield
Overhang: two inches that cost a third of your box strength
The strongest part of a corrugated box is its corners. Overhang is the practice of asking those corners to hold up the box while standing on nothing.
Read
- damage
- packaging
- specification
Questions
Answers to what buyers actually ask
Straight answers, including the ones that cost us the sale.
Can wood pallets be used in pharmaceutical warehouses?
Outside classified space, yes, and they commonly are. Kiln-dried stock with a documented moisture content and a written specification is widely accepted in ambient and controlled warehousing. Inside classified cleanroom space, plastic is effectively the only option.
What documentation do you provide?
A written specification, a per-delivery declaration against it, moisture certificates for kiln-dried stock, heat treatment charge records where applicable, and change notification before any material change to the build.
Do you supply pallets for validated automated systems?
Yes — new builds or plastic held to ±0.25 inch under change control, with a documented buffer so a supply gap never forces an unvalidated substitution.
How do you control moisture content for pharmaceutical storage?
By specifying it and then measuring it, rather than treating kiln-dried as a label. We meter to an agreed maximum on despatch and keep the reading with the batch record, because moisture drives both mould risk and the dimensional movement that upsets automated racking.
Can you supply pallets that do not shed particulate in classified areas?
For classified areas plastic is usually the right answer and we will say so. Where wood is acceptable up to the boundary, we sort for sound, low-shed surfaces with no loose fibre. We would rather scope the transition point honestly than sell a wood deck into a cleanroom.