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Partition paper looks like the easiest purchasing decision in the building it’s a plain sheet that goes between things. That’s exactly why it’s so often specified badly. Buyers pick a weight that seems about right, a supplier ships a general purpose grade, and the paper either fails to protect the product or costs more than the job needs. Getting it right isn’t complicated, but it does require matching three properties weight, coating, and cleanliness to what you’re actually protecting.
This guide explains those three decisions and how to make them for common products, so you specify partition paper deliberately instead of by default.
What partition paper is and what it does
Partition paper also called interleaving or separator paper is placed between stacked items to keep them from touching, cushion them against pressure and vibration, and, depending on the product, manage moisture or prevent chemical reactions. It’s used between circuit boards, glass panes, solar cells, metal sheets, and countless other products that stack.
The reason a “plain sheet” needs thought is that different products fail in different ways. One needs cushioning; another needs a surface that won’t scratch; another needs chemistry that won’t tarnish it; another needs moisture control. The paper that’s perfect for one can be wrong for the next. The three levers you have are weight, coating, and cleanliness.
Decision 1: Weight (GSM)
Basis weight, measured in GSM, mostly controls cushioning and bulk. It’s the first thing to get right.
Heavier paper cushions more and resists tearing, which suits heavy items, sharp or irregular edges, and stacks under significant load metal sheets, thick glass, heavy components. But weight adds cost, bulk, and stack height, so more isn’t automatically better. Lighter paper interleaves efficiently between thin, light, or numerous items stacked PCBs, solar cells, thin sheets where the job is separation more than cushioning.
The practical approach: start from the item’s weight, edge type, and stack load. Fragile-but-light items (cells, thin boards) point to lighter grades; heavy or sharp-edged items point to heavier ones. Then adjust for how many units stack, since height and handling matter too.
Decision 2: Coating and treatment
A partition sheet can be plain or given a coating or treatment that adds a property. This is where the paper is tuned to the specific failure you’re preventing.
Plain uncoated paper is the default separation and cushioning with no added function. It’s right when the only risk is physical.
Moisture-managing or absorbent treatments suit products where trapped moisture causes damage, such as glass (staining) or metal (corrosion). Here the paper actively helps keep surfaces dry.
Anti-corrosion / anti-tarnish properties matter when the product is chemically sensitive. Sulfur-free grades protect bright metal and electronics from tarnish; the coating or composition ensures the paper won’t cause a reaction.
Anti-static treatment is needed for static-sensitive electronic components, so the sheet doesn’t build or discharge a charge against the part.
Smooth or coated surfaces protect delicate finishes and optical surfaces from imprinting or micro-scratching.
The rule is to add only the property the product needs. Every treatment adds cost, and a plain sheet is the right answer when physical separation is the whole job.
Decision 3: Cleanliness
Cleanliness is the property buyers most often overlook, and for sensitive products it’s decisive. It has two dimensions.
Physical cleanliness (lint and particles). A paper that sheds fibers or carries grit contaminates and scratches. For finished boards, optical glass, and solar cells, low lint is essential the paper must not become the source of the defect it’s meant to prevent.
Chemical cleanliness (sulfur, chlorides, acidity, ionic residue). For electronics and bright metal, what the paper can transfer to the surface matters. Low sulfur prevents tarnish; low chlorides and acidity reduce corrosion and long-term degradation. Clean interleaving for these products is specified by measured properties, not appearance.
Match the cleanliness grade to the sensitivity of the product. A pallet of rugged parts needs far less than a stack of finished circuit boards.
Putting the three together
The table shows how the three decisions combine for common products. Treat it as a starting point to confirm with a sample, not a fixed prescription.
| Product | Weight (GSM) | Coating / treatment | Cleanliness priority |
| Stacked PCBs / finished boards | Light–medium | Sulfur-free; anti-static if needed | High (lint + sulfur) |
| Solar cells / wafers | Light | Plain, smooth | High (low lint) |
| Glass panes | Medium; heavier for large panes | Moisture-managing | High (low abrasion, moisture) |
| Metal sheets / parts | Medium–heavy | Anti-corrosion / sulfur-free | Medium–high (sulfur, chlorides) |
| General industrial items | Match to weight/edges | Plain | Standard |
A simple selection process
- Name the failure. Is the risk physical (scratch, pressure), chemical (tarnish, corrosion), moisture (staining), or static? Usually one dominates.
- Set the weight. From the item’s weight, edges, and stack load enough cushioning, no more.
- Add the treatment for the dominant risk. Sulfur-free for bright metal/electronics, moisture-managing for glass, anti static for sensitive components, plain if the risk is only physical.
- Set the cleanliness grade. High for finished electronics, cells, and optical surfaces; standard for rugged parts.
- Confirm size and format. Sized to the product, as sheets or rolls to suit handling.
- Validate with a sample. Interleave real product, handle it as your process does, and inspect.
Common mistakes
- Defaulting on weight. Too heavy wastes money and bulks the stack; too light fails to protect. Start from the item, not habit.
- Paying for treatments you don’t need or skipping ones you do. Match the coating to the actual failure mode.
- Ignoring cleanliness for sensitive products. The cheapest grade is rarely the cleanest, and contamination costs far more than it saves.
- Not validating. A sheet that looks right can still shed lint or mark a surface over a real handling cycle.
Bringing it together
Partition paper rewards a few minutes of deliberate thought. Name the way your product fails, set the weight for the cushioning it needs, add only the treatment that addresses the dominant risk, and match the cleanliness grade to how sensitive the product is. Confirm with a real sample, and the plain sheet between your products does its job at the right cost protecting what it should without paying for what it doesn’t.
Häufig gestellte Fragen
What GSM should partition paper be?
It depends on what you’re separating. Heavy or sharp-edged items and heavily loaded stacks need heavier paper for cushioning; thin, light, or numerous items like PCBs and solar cells use lighter grades where separation matters more than cushioning. Start from the item’s weight, edges, and stack load.
Was ist der Unterschied zwischen Trennpapier und Zwischenlagenpapier?
They’re essentially the same thing thin paper placed between stacked items to separate and protect them. Partition, interleaving, and separator paper are used interchangeably across industries; what varies is the weight, coating, and cleanliness specified for the product.
When do I need coated or treated partition paper?
Add a treatment only for the dominant risk: sulfur free or anti corrosion grades for bright metal and electronics, moisture managing grades for glass, anti static for static sensitive components, and smooth surfaces for delicate finishes. If the only risk is physical, plain uncoated paper is the correct, lower cost choice.
Does partition paper cleanliness really matter?
For sensitive products, yes, decisively. Lint and particles scratch or contaminate finished boards, cells, and optical glass, and chemical residues like sulfur cause tarnish on bright metal. Match the cleanliness grade to the product’s sensitivity; rugged parts need far less than finished electronics.
How do I choose partition paper for a mixed range of products?
Specify by the most sensitive product in the range, or use different grades for different products rather than forcing one grade to cover everything. A single “safe” heavy, clean grade can work but often costs more than necessary for the rugged items; matching grades to products is usually more economical.
CONCLUSION
Partition paper is a deliberate choice, not a default. Name the failure you’re preventing, set weight and treatment to match, choose the cleanliness your product’s sensitivity demands, and confirm with a sample.
Kangchuang supplies partition and interleaving paper across weights, treatments, and cleanliness grades, cut or slit to your product, with samples for validation. Tell us what you’re stacking and we’ll help you match the spec. Read more
