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Inverform + PET

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Formable Solid Bleached Board

Inverform is a multi-layered product (solid bleached board, SBB), entirely based on fresh fibres. Specific fibre compositions are used for the various layers in the construction to optimise performance. The outer layers are dominated by hardwood fibres to promote smoothness and printability. The middle layer consists of softwood fibres for strength, flexibility and formability.

Product description

Inverform with a polyethylene terephthalate (PET) extrusion coating has been specially developed for ready-made food packaging. With its exceptional formability and product consistency, Inverform + PET is very well suited for pressed and dual-ovenable trays that work in both microwaves and conventional ovens for chilled and frozen food.

The PET coating is ideal when temperature resistance is important, and it also acts as a fat and moisture barrier. The PET coating is heat-sealable and works with different types of lidding materials. Black, white and transparent versions of PET coatings are available upon request.

Application areas

The specific properties of this product make it suitable for the following applications:

Holmen Iggesund end use microwaving

Microwaving

Holmen Iggesund end use oven cooking

Oven cooking

Holmen Iggesund end use deep freezing

Deep freezing

Holmen Iggesund end use vapour

Vapour

Holmen Iggesund end use oxygen

Oxygen

Holmen Iggesund end use heat sealing

Heat sealing

Invercote/Inverform
Certifications & Standards

Product related

Possible to order as:

  

100% PEFC certified (PEFC/05-33-105)

FSC® Mix Credit 
(FSC-C110018)

Food safety

Archiving

Toy safety

Certificate no:
TUEV-PEFC-COC-117551

Certificate no:
TUEV-COC-000232

EC 1935/2004

EC 2023/2006

FDA 21 CFR

German BfR XXXVI

Acid free

EN 71 Part 3

EN 71 Part 9
All fibres from sustainable and controlled sources in compliance with the EU Timber Regulation EC 995/2010.
EcoVadis Platinum Medal awarded in 2024 (top 1% of all companies assessed).
 

Mill related

ISO 9001

ISO 14001

ISO 45001

ISO 50001

FSSC 22000

For more detailed information about our certificates, visit holmen.com/boardandpaper/certifications.

Common properties

Tolerances Methods/Remarks
Grammage (g/m²) 220-380 +/-6% ISO 536
ISO Brightness R457 - PS (%) 85 - ISO 2470-1
Moisture content (%) 8.0 +/-1.5 ISO 287
Cobb - PS (g/m²) 30 - ISO 535
Ply bond (J/m²) 160 ≥110 Tappi 569

Grammage dependent properties

Tolerances Methods/Remarks
Grammage (g/m²) 220 290 330 380 +/-6% ISO 536
Thickness (µm) 295 400 440 530 +/-6% ISO 534
Caliper (pt) 11.6 15.7 17.3 20.9 - ISO 534
Bending resistance L&W 15° - MD (mN) 180 400 570 800 -25% ISO 2493-1
Bending resistance L&W 15° - CD (mN) 80 160 210 320 -25% ISO 2493-1
Surface roughness Bendtsen - PS (ml/min) 400 400 400 700 - ISO 8791-2
Surface roughness Bendtsen - RS (ml/min) 500 600 600 800 - ISO 8791-2

PET properties

Tolerances Methods/Remarks
Added grammage (g/m²) 40 +/- 5% ISO 536
Added thickness (µm) 29 +/- 5% Calculated value
Surface smoothness (µm) ≤2.7 - ISO 8791
Adhesion 6 ≥ 5 Internal
Pin holes (no/m²) 0 ≤ 4 PTN 8-70 (modified)

Regarding Adhesion, the scale ranges from 1 to 6 (6 = the best possible adhesion on the concerned surface).

Holmen recommends a maximum 1 (one) year time limit, from delivery, for board in storage. For paperboard with barriers or foil lamination, the recommended storage time is no longer than 6 (six) months due to the declining effect of any surface treatments.

The above recommendations are only valid if the product is stored in its original wrapping.

Test methods

All properties are measured in test climate 23°C/50% RH at Iggesund Mill. Tolerances and max/min levels, when stated, are based upon a 95% confidence interval within each production run. Read more about testing methods in our General Technical Information.

 

Latest version

Access the latest version of this spec sheet on:
holmen.com/boardandpaper/inverform-pet

Related information

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Applications

Our paper and paperboard products are widely used in luxury packaging, book publishing, direct marketing and more.

Sustainability

At Holmen, we are committed to using renewable materials and managing our resources in a sustainable way.