Arcfibre MB 650 Heat-Sealable Moisture Barrier Coating
A heat-sealable version of the Arcfibre moisture barrier, giving a coating-to-coating or coating-to-board seal on cup seaming, tray lidding and wrap closing equipment alongside the barrier performance of MB 610. Seal conditions are set on the customer machine and seal strength is confirmed on the finished structure to ASTM F88.
Grade Arcfibre MB 650 | Range Paper, Board and Corrugated Coatings | Technology Water-based thermoplastic polymer dispersion, heat-sealable moisture barrier
Technical Data Sheet
Arcfibre MB 650
Issue 2026.09
1. Product description
A heat-sealable version of the moisture barrier, giving a coating-to-coating or coating-to-board seal on cup seaming, tray lidding and wrap closing equipment as well as the barrier performance of MB 610. Seal initiation temperature, dwell and jaw pressure are all set on the customer machine, and seal strength is confirmed on the finished structure to ASTM F88. Blocking in the reel or the stack is the usual constraint on a sealable coating, so reel tension, stack height and storage temperature should be agreed before a full run.
2. Features
- Coating-to-coating or coating-to-board heat seal
- Moisture barrier performance of MB 610
- Seal strength confirmed on the finished structure to ASTM F88
- Blocking controlled by agreed reel tension, stack height and storage temperature
3. Recommended uses
Cup side seams, tray lidding and wrap closures on cup and tray board, lidding and wrap paper and food-service board, where a heat-sealed fibre-based structure is being developed in place of extruded polyethylene.
Substrates. Cup and tray board, lidding and wrap paper, food-service board
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Water-based thermoplastic polymer dispersion, heat-sealable moisture barrier | Formulation |
| Appearance | White liquid drying to a transparent to translucent film | Visual assessment, supplier protocol |
| Carrier | Water | By formulation |
| Non-volatile content | 38 to 48 per cent by weight | ISO 3251 |
| Flow time, 4 mm flow cup at 20 degrees C | 30 to 50 seconds | ISO 2431 |
| pH at 20 degrees C | 7.5 to 9.0 | ISO 976 |
| Water absorption, Cobb 60 | 2 to 15 g per square metre on the coated face, falling as coat weight rises, measured on flat test pieces cut from the converted structure, including creased and scored areas | ISO 535 |
| Water vapour transmission rate, 23 degrees C and 50 per cent RH | 30 to 300 g per square metre per 24 hours, depending on coat weight and base board, and substantially higher at 38 degrees C and 90 per cent RH | ASTM E96 or ISO 2528, test climate quoted with the value |
| Heat seal strength, 15 mm strip | 2 to 8 N per 15 mm on the finished structure, set by seal temperature, dwell and jaw pressure on the customer machine | ASTM F88 |
| Blocking in the reel or stack | No blocking at the agreed reel tension, stack height and storage temperature | Customer or supplier protocol |
Typical values, not a specification. Values for each batch are given on its Certificate of Analysis.
5. Application
| Parameter | Guidance |
|---|---|
| Application method | Flexo, gravure or blade coater |
| Surface preparation | Record the base board Cobb value or sizing level; the sealing layer must be continuous across the seal area |
| Dilution | Supplied ready for use; dilution reduces barrier and seal, so adjust film build by anilox volume or pass count rather than by adding water |
| Applied dry coat weight | 6 to 14 g per square metre, by grammage difference to ISO 536, often in two passes |
| Drying | Hot air and IR to full dryness, with the web cooled before rewind or stacking, as a warm sealable film blocks in the reel even when dry; reel tension and stack height as agreed |
| Next step | Heat sealing on the converter's forming, seaming or lidding line, with seal initiation temperature, dwell and jaw pressure set on that machine |
| Handling and safety | Refer to the Safety Data Sheet, issued by Arctic on request. |
Process. Flexo, gravure or blade coater, hot air and IR drying, followed by heat sealing on the converter’s forming, seaming or lidding line
6. Storage and handling
Store in the original closed container at 5 to 30 degrees C, protected from frost and direct heat, and stir gently before use. Shelf life is stated on the label and Certificate of Analysis. Handle and use the product in line with its Safety Data Sheet.
7. Safety and regulatory information
Read the Safety Data Sheet before use. Safety Data Sheets and regulatory declarations are issued by our technical centre against the product and batch supplied, so they are sent on request rather than published. Request a Safety Data Sheet or declaration.
This Technical Data Sheet is published for on-screen reference. The information is given in good faith from laboratory and application experience and describes typical values; it is not a specification and does not replace a trial on your own substrate and line. Arctic Materials may revise this sheet without notice. Issue 2026.09.
Technical Data Sheets on this site are for on-screen viewing. For a controlled copy, write to tech@arcticmaterials.com.
Other grades in this range
Need a Safety Data Sheet, a regulatory declaration or a grade specified to your line? Contact our technical centre.