Inverform + PET

Inverform + PET

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Formable Solid Bleached Board

Inverform is a multi layered solid bleached board (SBB) product, 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 works both in microwave or a conventional oven for both 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.

End use

The specific properties of the product allow it to be used in the following areas.

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

PEFC
credit
material

FSC® Mix

Food safety

Archiving

Toy safety

2778 PEFC

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 2021 (top 1% of all companies assessed).
 

Mill related

ISO 9001

ISO 14001

ISO 45001

ISO 50001

FSC®

FSSC 22000

For more detailed information about our certificates, visit iggesund.com/certificates.

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 - -
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

Please note that the figures for 220 gsm are preliminary.

PET Properties

Tolerances Tolerances Methods/Remarks
Added grammage (g/m²) 30 +/- 7% 40 +/- 5% ISO 536
Added thickness (µm) 22 +/- 7% 29 +/- 5% Calculated value
Surface smoothness (µm) ≤2.7 - ≤2.7 - ISO 8791
Adhesion 5 ≥ 4 6 ≥ 5 Internal
Pin holes (no/m²) 0 ≤ 4 0 ≤ 4 PTN 8-70 (modified)

Last updated 01 Nov 2022

Regarding Adhesion, the scale is 1–6. (6 = the best possible adhesion on the concerned surface).

Test method

All properties are measured in test climate 23°C/50% RH at Iggesund mill. Tolerances and max/min levels, when stated, are based upon 95% confidence interval within each production run.

Read more about testing methods in our section about General Technical Information.

 

Online version

Access the online version of this spec sheet on:
iggesund.com/inverform-pet