Base paper: glassine, supercalendered, 100 % wood pulp GSM: 40 / 60 / 70 / 80 / 90 / 105 / 120 gsm Colour: white (translucent) · yellow · ginger · blue Coating: single sided or double sided, solvent-based or solvent-free Form: jumbo roll, slit roll, sheet

 

Why a Dense Base Paper Gives You a Better Release Liner

The base paper is not a passive carrier. It decides the economics and the consistency of the release.

Consequence of glassine's density	Why it matters to you
Silicone stays on the surface (high holdout)	Silicone that soaks into the sheet is wasted - it contributes nothing to release. A dense sheet means the coating you pay for is doing the work.
Lower coat weight for the same release	Directly reduces your cost per square metre of liner
Less variation across the web	An open, uneven sheet absorbs unevenly, so release force drifts across the roll and from roll to roll. A dense sheet releases consistently.
Consistent release in changing humidity	Paper is hygroscopic; density limits how much the sheet absorbs and swells. This is why a glassine liner behaves the same in a humid warehouse and a dry press room.
Barrier as well as release	Low porosity resists grease, oil and water, so the liner also protects the adhesive and the product behind it
Translucency	You can see the adhesive or the label through the liner - useful for inspection, for registration on a vision system, and for checking that the silicone is uniformly applied
Low dust and low static	No loose fibre at the slit edge - important for hygiene products, medical and electronic laminates

 

 

Glassine vs CCK, Woodfree and Kraft Liners

Base paper	Surface	Silicone holdout	Release consistency	Transparency	Relative cost	Best for
Glassine	Very smooth, dense, closed	Excellent	Excellent	Translucent	Highest	High-speed label and tape liners where consistency matters
CCK (clay-coated kraft)	Clay-coated, smooth face	Good	Good	Opaque	Medium	Where a smooth release face is wanted at lower cost
Woodfree / woodfree offset	Smooth but more porous than glassine	Moderate	Moderate	Opaque white	Lower	General-purpose liners, less demanding converting
Kraft	Rougher, open	Lower - absorbs more silicone	Fair	Opaque brown	Lowest	Industrial protection and economy grades
PET film	Non-porous, perfectly smooth	Best - no absorption at all	Best	Highly transparent	Highest	Precision converting, thin liners, die-cutting and electronics

How to choose: glassine is the default where release consistency and coat-weight economy both matter and a paper liner is acceptable. Move to film where thickness tolerance, dimensional stability under tension, or non-porosity is the governing requirement. Move down to CCK, woodfree or kraft where the liner is only a protective carrier and cost dominates.

 

White, Yellow or Blue - Colour Options

Colour on a release liner is functional, not decorative.

Colour	Why buyers choose it
White / translucent	Most common. The translucency lets you inspect the adhesive through the liner and check that the silicone is uniformly applied.
Yellow / ginger	Traditional for hygiene products; makes the liner side immediately identifiable and helps registration.
Blue	Widely used on label backing - the colour makes it unmistakable which side is the liner, so the web cannot be loaded the wrong way, and it supports vision-system registration.
Coloured, printed	Printed liners are used for brand marks and for instructions visible on the reverse.

 

Single or Double Sided Silicone Coating

	Single sided	Double sided
Coating	Release face on one side only	Both faces release; typically differential - one face easier than the other
Typical build	~ 80 gsm glassine	~ 105 gsm and above
Used for	Self-adhesive labels, tapes, hygiene products - the liner protects one adhesive face	Interleaving between two adhesive faces; double-sided tape; lay-up of multilayer PCB; tacky waxes, resins and rubber sheet
Detail to specify	Release force and subsequent adhesion	Which side is the easy side and which is the tight side, and the difference between them

→ For the coating side in detail, see Single Side Glassine Silicone Release Paper and Glassine Release Paper Double Sided. → For release force, test methods and coating chemistry, see Release Force and Coating Systems.

 

Applications

Application	Why glassine fits	Typical GSM
Self-adhesive label liner	Dense surface gives consistent release and low silicone usage on high-speed presses	70 – 90
Adhesive tape	Smooth, consistent release for unwind and rewinding	80 – 105
Hygiene products - sanitary napkin, liner	Pure wood pulp, no optical brightener, clean and dust-free; the release protects the adhesive until use	40 – 60
Medical - dressings and patches	Clean, consistent, printable, with controlled release	60 – 90
Envelope windows and sealing	Glassine's translucency and grease resistance plus a release face	40 – 70
Interleaving for tacky materials	Double-sided release prevents blocking of waxes, resins and rubber sheet	105 – 140
Multilayer PCB lay-up	Double-sided release for prepreg pressing	105 – 120
Food-contact wrapping	Glassine is greaseproof and food-grade; with release where a food adhesive is involved	38 – 80

 

FAQ:

FAQ

What is glassine and why is it used for release liners? Glassine is a supercalendered wood-pulp paper - pressed through heated calender rolls until the fibre structure closes and the sheet becomes dense and translucent. It is used for release liners because that dense surface holds the silicone on the surface instead of absorbing it, giving lower coat weight and more consistent release than an open paper.

Is glassine the same as cellophane? No. Cellophane is a regenerated cellulose film; glassine is a paper. If a supplier page describes glassine as a semipermeable membrane or a heat-sealing film, it is describing cellophane.

How much does the base paper affect the release? More than most buyers expect. An open, uneven paper absorbs silicone unevenly, so you pay for coating that does not contribute to release and the release force drifts across the roll. Glassine is the densest liner base paper, which is why it is used where consistency matters.

Which GSM should I choose? 40 gsm for hygiene and window applications; 70 – 90 gsm for standard label and tape liners; 105 gsm and above for double-sided release, interleaving and heavy-duty work. Tell us the press speed, web width and application and we will confirm.

What colours are available? White translucent, yellow, ginger and blue. Blue is common on label backing because it makes the liner side unmistakable and aids registration. [State your actual stocked colours.]

Do you supply single and double sided? Yes - single sided for one adhesive face; double sided with differential release for interleaving between two adhesive faces. Specify which side is the easy side and the difference you need between them.

Is glassine suitable for food contact? Glassine is greaseproof and available in food-grade grades with no optical brightener. Confirm the requirement when ordering so the correct grade is supplied. See our guide Can Glassine Paper Be Used for Food Packaging.

Can the liner be printed? Yes - printed liners are used for branding and for instructions visible on the reverse. Send artwork and state the colour count.

What documentation can you provide? MSDS, TDS, test report, certificate of origin and SGS report. Where a release force or subsequent adhesion value is specified, the batch report carries the test result.

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