7 Paper Specifications Every Converter Should Verify Before Ordering Food Packaging Paper

Paper specifications for food packaging are not interchangeable with paper specifications for general packaging. A paper that prints well and folds cleanly for a retail carton may fail completely when it contacts hot, oily food. The difference is in the specifications, and most converters who experience problems on the line or complaints from food brand clients can trace the issue back to a specification that was not checked before ordering.

India’s paper packaging market reached USD 14.2 billion in 2025, with food packaging accounting for the fastest growing segment at 8.3% CAGR (Mordor Intelligence, 2025). As more food brands transition from plastic to paper-based packaging under the SUP ban, converters are handling paper grades they have not worked with before. That transition is where specification gaps cause the most damage.

These are the seven specifications that separate paper that works for food packaging from paper that causes problems.

Key takeaways

• Fibre source determines consistency. Virgin pulp from agricultural residue (bagasse) provides batch-to-batch uniformity that recycled fibre cannot match. Recycled paper carries contamination risks (MOSH/MOAH from printing inks) that make it unsuitable for direct food contact.
• GSM is not a quality metric; it is a weight metric. A well-engineered 60 GSM paper can outperform a poorly made 80 GSM paper on rigidity and tear resistance. Test the functional properties, not just the weight.
• Barrier performance (grease resistance, moisture resistance) must be tested under food-contact conditions, not dry conditions. A paper that passes dry barrier tests may fail with hot samosas.
• Runability on your specific equipment matters more than runability on the supplier’s test line. Request trial rolls and run them on your machines before ordering production quantities.
• Food-contact safety certification (FSSAI compliance) and compostability certification (IS 17088) are separate. Both may be required, depending on the application.

1. Fibre source and raw material traceability

The fibre source determines the paper’s baseline properties: strength, formation, consistency across batches, and contamination profile.

Virgin pulp from agricultural residue (primarily sugarcane bagasse in India) produces paper with consistent fibre length distribution and predictable converting behaviour. Because the pulp source is controlled and traceable, batch-to-batch variation is low. India produces roughly 100 million tonnes of bagasse annually from sugarcane crushing (Indian Sugar Mills Association, 2024), making it an abundant and stable fibre source.

Virgin wood pulp (bleached kraft) delivers high strength and brightness but depends on forestry supply chains with longer lead times and greater price volatility.

Recycled fibre carries risks for food contact. Post-consumer recycled paper may contain printing inks (mineral oil hydrocarbons: MOSH/MOAH), adhesive residues, and contaminants from previous use. These substances can migrate into food, which makes recycled paper unsuitable for direct food contact unless it has been decontaminated and tested for migration compliance. The FSSAI has flagged this risk, and leading QSR chains are moving away from recycled paper for direct food contact applications.

For converters serving food brands, ask the paper supplier for fibre source documentation and, for any recycled content, migration test reports showing MOSH/MOAH levels below regulatory limits.

2. GSM and structural properties

GSM (grams per square metre) is the most commonly cited paper specification. It is also the most commonly misunderstood. GSM tells you the weight of the paper, not how it will perform.

Two papers at the same GSM can have significantly different rigidity, tear resistance, and burst strength depending on fibre composition, formation, and calendering. A 60 GSM paper with well-refined bagasse fibres can match or exceed the stiffness of an 80 GSM paper made with shorter recycled fibres.

The functional specifications to check alongside GSM:

Specify the functional requirements for your application, then find the GSM that delivers them. Starting from a GSM target and hoping the other properties follow is backwards.

3. Food-contact safety

This is non-negotiable for any paper that will touch food. FSSAI Packaging Regulations 2018 require food-contact materials to be food grade, safe for human consumption, and conforming to specified Indian Standards.

What to verify:
– Migration testing. The paper (including any coatings) must not transfer harmful substances to food above specified limits. Request the migration test report from an NABL-accredited laboratory.
– IS code compliance. Greaseproof paper must meet IS 6622. Wrapping paper must meet IS 6615. Folding box board must meet IS 1776. Ask which IS code the paper is certified against.
– Ink safety. If the paper is pre-printed, confirm that the inks are food-safe and that the ink is on the non-food-contact side, or that it meets migration limits if on the food side.
– PFAS status. Paper with grease-resistant coatings may contain PFAS (per- and polyfluoroalkyl substances). FSSAI has proposed draft amendments restricting PFAS in food packaging. Specify PFAS-free coatings to avoid regulatory risk.

A paper supplier claiming “food grade” without providing migration test reports and IS code certification is making an unverified claim. Do not accept it at face value.

4. Barrier performance

Food packaging paper needs to resist grease, moisture, or both, depending on the application. The barrier is usually provided by a coating on the paper surface, not by the paper itself.

Grease resistance is measured by the 3M KIT test (TAPPI T559). Level 12 is the highest rating. For QSR applications (burger wraps, fry sleeves, pizza boxes), target Level 8 or higher. For confectionery wraps with low oil content, Level 4 to 6 may be adequate.

Moisture resistance is measured by Cobb test (IS 1060) for short-duration exposure and MVTR for long-term performance. For takeaway packaging where the food is consumed within 30 to 60 minutes, Cobb values below 20 g/m2 are typically adequate. For retail packaging needing weeks of protection, MVTR testing is necessary.

The barrier specification must be tested under conditions that represent actual use. A paper that passes grease resistance testing at room temperature may fail at 80 degrees C when it contacts hot food. Specify the test temperature when requesting barrier data. If the supplier only has room-temperature data, request hot-oil or hot-water resistance testing.

5. Runability on converting equipment

Runability is the paper’s behaviour on your converting machinery: how it feeds, tracks, cuts, creases, and seals. A paper with excellent barrier properties that jams on your die-cutter every 500 sheets is not a usable material.

Runability depends on the interaction between the paper properties and your specific equipment. It is not fully predictable from spec sheets. The only reliable way to validate runability is to run trial rolls on your actual production equipment.

Properties that affect runability:
– Moisture content (6 to 8% is typical). Too dry and the paper cracks during creasing. Too wet and it curls or sticks in the feeding system.
– Grain direction relative to the converting direction. Paper folds more cleanly along the grain and tears more easily across it.
– Surface smoothness. Rough surfaces cause friction variation in feeding systems. Coated papers may have different surface friction on each side.
– Curl tendency. Paper with differential coating weights or moisture profiles will curl, causing misfeeds and jams.

Request trial rolls of 500 to 1,000 kg from the supplier before committing to production volumes. Run the trials under your normal production conditions, not at reduced speed or with extra operator attention. The point is to find problems, not to demonstrate that the paper works under ideal conditions.

6. Print compatibility

Packaging paper is a brand communication surface. If the paper does not hold ink consistently, the brand colours shift between batches, the text resolution drops, or the coating interferes with ink adhesion, the converter’s food brand client will reject the output.

Key factors:
– Surface energy. The paper surface must accept ink without beading or spreading. Coated papers may need corona treatment or primer for some ink systems.
– Ink adhesion. Test with your specific ink system (water-based, UV-curable, solvent-based). Adhesion that works with one ink type may not work with another.
– Dot gain. Porous papers absorb more ink, causing dot gain that muddies fine details and shifts colours. Calibrate your print profiles to the specific paper.
– Rub resistance. After printing, the ink must resist scuffing during converting, packaging, and consumer handling. Test with ASTM D5264 (Sutherland rub test).

If you are switching from a plastic film substrate to paper, your existing print profiles will not transfer directly. Budget for print calibration and colour matching as part of the material transition.

7. End-of-life pathway and compostability

For converters serving brands with sustainability commitments or EPR compliance requirements, the paper’s end-of-life pathway is a specification, not a marketing claim.

Compostable certification (IS 17088) requires the finished product, including coatings and inks, to pass biodegradation, disintegration, ecotoxicity, and heavy metal tests. A base paper that is compostable may become non-compostable when a non-compliant coating is applied. The certification must cover the finished product, not the base material.

Recyclable paper must be free of contaminants that disrupt recycling processes. Metallised coatings, PE laminations, and wax coatings can make paper non-recyclable in practice, even if the base paper is recyclable. Check with local recycling facilities whether they accept the specific paper product.

For EPR compliance, compostable paper (IS 17088 certified) enters organic waste streams, simplifying the brand’s end-of-life obligation. Non-compostable paper requires proof of recycling, which depends on local recycling infrastructure availability.

Frequently asked questions

What GSM should I use for food packaging paper?
GSM depends on the application. Wraps and liners: 30 to 60 GSM. Trays and plates (moulded fibre): 150 to 300 GSM equivalent. Folding cartons: 200 to 350 GSM. Do not choose GSM in isolation; specify the functional requirements (burst strength, stiffness, tear resistance) and select the GSM that delivers them.

Is recycled paper safe for direct food contact?
Not without decontamination and migration testing. Post-consumer recycled paper may contain MOSH/MOAH from printing inks and adhesive residues. For direct food contact, use virgin fibre paper tested to FSSAI food-contact requirements, or recycled paper with verified migration test results below regulatory limits.

How do I verify that a paper coating is PFAS-free?
Request a declaration from the paper supplier that the coating does not contain intentionally added per- and polyfluoroalkyl substances. Some suppliers provide third-party test reports confirming total fluorine content below detection limits. FSSAI draft amendments are moving toward PFAS restrictions, so specifying PFAS-free now avoids future compliance issues.

What trial quantity should I order before committing?
500 to 1,000 kg of trial rolls is standard for most converting operations. This is enough to run machine compatibility tests, print calibration, and produce samples for shelf life studies. Trial quantities cost 10 to 20% more per kg than production orders but prevent far larger losses from production failures.

Does paper-based food packaging need both FSSAI and IS 17088 certification?
FSSAI food-contact compliance is mandatory for all food packaging. IS 17088 certification is needed only if the product claims to be compostable. They are separate certifications testing different properties. A product can be food-safe but not compostable, or compostable but not food-safe. Both are needed for compostable food packaging.

How does paper food packaging compare to plastic on cost?
Paper-based food packaging typically costs 10 to 30% more per unit than equivalent plastic formats for direct food contact applications. The cost gap narrows when you include EPR compliance costs for plastic and consumer willingness to pay for paper-based sustainable packaging. For secondary packaging and dry food wraps, paper is often cost-competitive.

Sourcing food packaging paper for your converting operations? Talk to our team about fibre options, barrier specifications, and trial roll availability.