{"id":5574,"date":"2026-05-15T05:43:18","date_gmt":"2026-05-15T05:43:18","guid":{"rendered":"https:\/\/kangchuangpapers.com\/?p=5574"},"modified":"2026-05-16T06:50:41","modified_gmt":"2026-05-16T06:50:41","slug":"glassine-paper-vs-kraft-paper","status":"publish","type":"post","link":"https:\/\/kangchuangpapers.com\/de\/glassine-paper-vs-kraft-paper\/","title":{"rendered":"Glassine Paper vs Kraft Paper: Industrial Packaging Decision Guide"},"content":{"rendered":"

For packaging buyers choosing between glassine paper and kraft paper for an industrial application, the decision comes down to one fundamental question: does the application need a barrier property that only glassine provides, or does it need the mechanical strength that kraft provides? These are not interchangeable substrates despite the fact that both are paper-based. Glassine has been supercalendered to near-transparency and near-impermeability to air, moisture, and grease \u2014 properties that kraft paper<\/a>, even at 180 GSM, cannot match regardless of weight. Kraft paper has tensile strength and tear resistance that glassine at equivalent weight cannot approach.<\/p>\n\n\n\n

Specifying kraft paper for an electronics PCB<\/a> interleaving application where the board runs through automated pick-and-place \u2014 and discovering that kraft paper’s particulate shedding contaminates the solder paste \u2014 is an application mismatch that costs $5,000\u2013$15,000 in rework per production run. Specifying glassine for a heavy-duty pallet wrapping application where tensile strength is the only performance requirement is paying $3\u2013$5\/kg more than necessary for barrier properties you are not using.<\/p>\n\n\n\n

This guide covers what glassine paper and kraft paper actually are structurally, the performance properties that differentiate them, the specific applications where each wins, and a decision matrix for the industrial packaging scenarios where both are considered.
<\/p>\n\n\n\n

What Glassine Paper Actually Is \u2014 and How It Differs From Kraft<\/strong><\/h2>\n\n\n\n
Property<\/strong><\/th>Glassine Paper<\/strong><\/th>Kraft Paper<\/strong><\/th><\/tr><\/thead>
Manufacturing process<\/td>Wood pulp paper, super-calendered under high pressure\/temperature to collapse fibre structure<\/td>Kraft (strong) pulp paper, typically unbleached; dried without heavy calendering<\/td><\/tr>
Appearance<\/td>Semi-transparent, smooth, glossy<\/td>Brown\/cream, opaque, rougher surface<\/td><\/tr>
Density\/opacity<\/td>Semi-transparent \u2014 light passes through<\/td>Fully opaque<\/td><\/tr>
Basis weight range<\/td>25\u2013120 GSM (most applications 40\u201380 GSM)<\/td>40\u2013180 GSM<\/td><\/tr>
Grease resistance<\/td>Excellent \u2014 supercalendering closes fibre gaps<\/td>Low to moderate \u2014 grease penetrates unless coated<\/td><\/tr>
Air permeability<\/td>Very low \u2014 near-impermeable to air<\/td>High \u2014 permeable to air and humidity<\/td><\/tr>
Moisture resistance<\/td>Moderate \u2014 better than kraft but not waterproof<\/td>Low \u2014 absorbs moisture readily unless coated<\/td><\/tr>
Tensile strength<\/td>Low for weight \u2014 supercalendering reduces fibre bond<\/td>High \u2014 kraft pulp process specifically preserves tensile strength<\/td><\/tr>
Tear resistance<\/td>Low \u2014 tears easily along fibre direction<\/td>High \u2014 fundamental kraft strength property<\/td><\/tr>
Particulate shedding<\/td>Very low \u2014 closed fibre structure<\/td>Moderate \u2014 open fibre structure sheds fibres<\/td><\/tr>
Food contact compliance<\/td>FDA 21 CFR 176 compliant (uncoated)<\/td>FDA 21 CFR 176 compliant (unbleached, uncoated)<\/td><\/tr>
Cost per kg<\/td>Higher \u2014 $1.50\u2013$2.80\/kg<\/td>Lower \u2014 $0.80\u2013$1.60\/kg<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Where Glassine Paper Wins: The Specific Applications<\/strong><\/h2>\n\n\n\n

1. Electronics and PCB Interleaving<\/strong><\/h3>\n\n\n\n

Glassine’s near-zero particulate shedding and low air permeability make it the standard interleaving material between PCB layers during assembly and shipping. Kraft paper’s open fibre structure sheds fibres that contaminate solder paste and oxidise copper traces. Glassine’s closed supercalendered surface produces a smooth, particle-free interface that protects sensitive component surfaces without contamination risk. Standard specification: 40\u201360 GSM glassine, sulfur-free, anti-tarnish compound applied or built into the pulp for precious metal protection.<\/p>\n\n\n\n

2. Release Liner Applications<\/strong><\/h3>\n\n\n\n

Glassine’s smooth, closed surface provides the uniform coating surface required for silicone release liner production. Pressure-sensitive adhesive labels, medical dressings, and industrial tapes use glassine as the release liner base \u2014 kraft paper’s rough, absorbent surface cannot accept the uniform silicone coating required for consistent release force. The global release liner market almost exclusively uses glassine as the base substrate.<\/p>\n\n\n\n

3. Food Packaging with Grease Resistance Requirements<\/strong><\/h3>\n\n\n\n

Butter wrappers, sandwich paper, bakery interleaving, and charcuterie wrapping require grease resistance that uncoated kraft cannot provide. Glassine’s supercalendered structure provides inherent grease resistance (FDA 21 CFR 176 compliant) without additional coating \u2014 reducing cost and maintaining food contact compatibility. For premium bakery and deli applications where the packaging is customer-facing, glassine’s smooth, semi-transparent appearance also provides aesthetic value.<\/p>\n\n\n\n

4. Pharmaceutical and Medical Packaging<\/strong><\/h3>\n\n\n\n

Pharmaceutical blister pack base materials, sachet liner papers, and medical device wrap use glassine for its near-impermeability to air and moisture (without the barrier properties of foil-laminated structures), FDA compliance, and low particulate generation. Where full aluminium foil barrier is not required but a degree of moisture protection is needed, glassine outperforms kraft in pharmaceutical packaging.<\/p>\n\n\n\n

5. Precision Metal Component Interleaving<\/strong><\/h3>\n\n\n\n

Bearing races, precision gear components, and optical elements use glassine interleaving to prevent metal-to-metal contact, corrosion, and scratching during shipping. Glassine’s sulfur-free formulation (critical \u2014 standard paper contains sulfur compounds that tarnish silver<\/a>, copper, and certain precious metals) and smooth surface prevent the abrasion and galvanic corrosion that rough kraft paper would cause on polished precision surfaces.<\/p>\n\n\n\n

Where Kraft Paper Wins: The Specific Applications<\/strong><\/h2>\n\n\n\n

1. Heavy Packing and Void Fill<\/strong><\/h3>\n\n\n\n

Kraft paper’s tensile strength (3\u20135\u00d7 glassine at equivalent weight) makes it the only suitable paper substrate for pallet wrapping, case lining, and high-force void fill applications. Glassine tears immediately under the mechanical stress of pallet-level packaging operations.<\/p>\n\n\n\n

2. Industrial Wrapping for Large Parts<\/strong><\/h3>\n\n\n\n

Machined parts, structural components, and heavy industrial products wrapped for transit use 90\u2013120 GSM kraft paper. The tensile strength survives the wrapping tension and handling forces that would split glassine.<\/p>\n\n\n\n

3. Multi-Wall Industrial Bags and Sacks<\/strong><\/h3>\n\n\n\n

Multi-wall kraft bags for cement, flour, chemical granules, and building materials require the tensile and burst strength that only kraft provides. Glassine has no role in sack and bag applications.<\/p>\n\n\n\n

4. E-Commerce Void Fill and Cushioning<\/strong><\/h3>\n\n\n\n

Crumpled kraft provides the elastic void fill properties (spring-back after compression) that glassine cannot provide \u2014 glassine doesn’t crumple into effective cushioning due to its brittle supercalendered structure.<\/p>\n\n\n\n

Decision Matrix: Glassine vs Kraft Paper<\/strong><\/h2>\n\n\n\n
Application<\/strong><\/th>Use Glassine<\/strong><\/th>Use Kraft<\/strong><\/th>Reason<\/strong><\/th><\/tr><\/thead>
PCB \/ electronics interleaving<\/td>Yes \u2014 zero particulate shedding<\/td>No \u2014 fibre shedding contaminates<\/td>Cleanliness and low particulate generation<\/td><\/tr>
Release liner base<\/td>Yes \u2014 required<\/td>No \u2014 surface too rough for silicone coating<\/td>Smooth, closed surface required<\/td><\/tr>
Grease-resistant food wrap<\/td>Yes \u2014 inherent grease resistance<\/td>Only if coated (adds cost)<\/td>Glassine provides uncoated grease resistance<\/td><\/tr>
Pharmaceutical sachet liner<\/td>Yes \u2014 air\/moisture control<\/td>No \u2014 too permeable<\/td>Near-impermeability to air and moisture<\/td><\/tr>
Precision metal interleaving<\/td>Yes (sulfur-free grade)<\/td>No \u2014 sulfur tarnishes metals<\/td>Sulfur-free, smooth, non-abrasive surface<\/td><\/tr>
Pallet wrapping<\/td>No \u2014 tears<\/td>Yes \u2014 tensile strength<\/td>Mechanical strength requirement<\/td><\/tr>
Void fill \/ cushioning<\/td>No \u2014 no spring-back<\/td>Yes \u2014 crumples into effective cushioning<\/td>Elastic void fill properties<\/td><\/tr>
Multi-wall industrial bags<\/td>No<\/td>Yes<\/td>Burst and tensile strength<\/td><\/tr>
E-commerce gift wrap<\/td>Yes \u2014 premium look<\/td>Yes \u2014 natural look<\/td>Both work; cost and aesthetics determine choice<\/td><\/tr>
Heavy industrial parts wrap<\/td>No \u2014 tears<\/td>Yes<\/td>Tensile and puncture resistance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Frequently Asked Questions<\/strong><\/h2>\n\n\n\n

What is glassine paper made of?<\/strong><\/h3>\n\n\n\n

Glassine paper is made from wood pulp that has been beaten to a high degree of freeness (long, refined fibres) and then supercalendered under heavy pressure and temperature between polished steel rollers. This supercalendering process compresses and densifies the paper, collapsing the air voids between fibres, which creates the semi-transparent, smooth, and relatively impermeable surface that distinguishes glassine from other papers. No coating is applied \u2014 the barrier properties come entirely from the physical compression of the fibre network. The resulting paper has very low air permeability, smooth surfaces, and excellent grease resistance.<\/p>\n\n\n\n

Is glassine paper food safe?<\/strong><\/h3>\n\n\n\n

Yes. Uncoated glassine paper manufactured from virgin wood pulp complies with FDA 21 CFR 176 food contact paper requirements. Glassine’s smooth, low-particulate surface and freedom from printing inks or coatings makes it suitable for direct food contact applications including butter wrapping, bakery interleaving, charcuterie wrap, and deli paper. For pharmaceutical applications, glassine must also comply with relevant USP or pharmacopoeia specifications depending on the device class and regulatory jurisdiction.<\/p>\n\n\n\n

Can glassine paper replace kraft paper for PCB interleaving?<\/strong><\/h3>\n\n\n\n

Yes \u2014 and it is the correct replacement. Glassine’s supercalendered, closed fibre structure produces near-zero particulate shedding, making it the appropriate choice for PCB interleaving applications where kraft paper’s<\/a> fibre shedding would contaminate solder paste or oxidise exposed copper traces. The correct specification for PCB interleaving glassine is: 40\u201360 GSM, sulfur-free (confirmed by sulfur-free test report), with volatile corrosion inhibitor (VCI) compound if copper or tin protection over extended storage is required.<\/p>\n\n\n\n

What is the cost difference between glassine and kraft paper?<\/strong><\/h3>\n\n\n\n

Glassine paper costs approximately $1.50\u2013$2.80\/kg depending on grade (sulfur-free, anti-tarnish, release-liner grade) and order volume. Standard unbleached kraft paper costs $0.80\u2013$1.60\/kg. The glassine premium of 50\u2013100% over kraft is driven by the additional supercalendering processing and the higher-quality fibre required to produce consistent transparency and barrier properties. For applications that genuinely require glassine’s barrier properties (electronics, pharmaceutical, precision metal interleaving), the cost difference is justified. For applications where only mechanical strength or wrapping coverage is needed, kraft at lower cost is the correct specification.<\/p>\n\n\n\n

Conclusion: Glassine for Barrier; Kraft for Strength<\/strong><\/h2>\n\n\n\n
    \n
  • Glassine wins when the application requires grease resistance, low air permeability, zero particulate shedding, or smooth non-abrasive surfaces \u2014 electronics, pharmaceutical, release liner, food grease wrap<\/li>\n\n\n\n
  • Kraft wins when the application requires tensile strength, tear resistance, void fill spring-back, or heavy-duty industrial wrapping<\/li>\n\n\n\n
  • The cost premium of glassine over kraft (50\u2013100%) is justified when its barrier properties are functionally required and not justified when only mechanical coverage is needed<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

    For packaging buyers choosing between glassine paper and kraft paper for an industrial application, the decision comes down to one fundamental question: does the application need a barrier property that only glassine provides, or does it need the mechanical strength that kraft provides? These are not interchangeable substrates despite the fact that both are paper-based. […]<\/p>\n","protected":false},"author":2,"featured_media":5598,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[32],"tags":[],"class_list":["post-5574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/posts\/5574","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/comments?post=5574"}],"version-history":[{"count":2,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/posts\/5574\/revisions"}],"predecessor-version":[{"id":5599,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/posts\/5574\/revisions\/5599"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/media\/5598"}],"wp:attachment":[{"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/media?parent=5574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/categories?post=5574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kangchuangpapers.com\/de\/wp-json\/wp\/v2\/tags?post=5574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}