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Firewall Flame Resistant Board

Firewall Flame Resistant Board

Firewall FRB is a premium grade twin wall board made with a block-copolymer polypropylene resin in a unique Coroplast® flame inhibiting additive package.

Printing on Flame Resistant Board

Coroplast® Firewall FRB is made with polypropylene copolymer, a nonabsorbent material, and requires inks formulated for this type of product. Recommended solvent based screen printing inks formulated for Coroplast should be used for best appearance and adhesion. Improved UV and water-based inks are becoming available.

Coroplast Firewall FRB is corona treated full width on both surfaces. Corona treatment is needed for all printing applications. See Coroplast Screen Printers Guide and Technical Bulletin CSS-006 "Screen Printing Inks" for additional information on printing on Coroplast It is recommended that ink tests be performed prior to production of parts.

Corona treatment also improves the performance of most adhesives.

Fabrication with Coroplast Flame Resistant Board

Coroplast Firewall FRB boards can be die cut or slit on standard conversion equipment.

Coroplast Firewall FRB boards have a higher mineral content than regular Coroplast board due to the flame inhibiting additives package. Higher mineral content usually increases stiffness and decreases flexibility which may require adjustments to die cutting equipment to maintain optimum performance. Die cutting and creasing becomes easier as temperature increases. Recommended die cutting and creasing Coroplast® flame resistant board at room temperature or warmer for optimum performance.

For additional information on fabricating with Coroplast Firewall FRB boards please refer to Coroplast technical bulletin CSS-005 General Conversion Information.

Static Build-up

Plastics develop static charge during handling. This build-up becomes most evident during screen printing or converting.

Coroplast Firewall FRB boards have a static-free additive which minimizes the build-up by quickly dissipating the charge. The static-free additive requires moisture in the air: therefore, the more moisture in the air the better the system works.

Abuse Resistance

Coroplast Firewall FRB boards can be cleaned with soap and water and most solvents without affecting the sheet properties or appearance. See Technical Bulletin CSS-02 for additional information on Coroplast resistance to solvents.

Coroplast board is resistant to dings and punctures.

Coroplast® Firewall FRB

Product Gauge mm Color UL94 Class Typical Applications
Firewall/ FRB 2-6 mm Standard Colors 94V-2 Displays, Trade show booths, heat exchange media, construction, temporary walls

General properties of the copolymer polypropylene resin used in Firewall FRB is contained in Coroplast Technical Bulletin CSS-001.

UL Test Procedures

UL94 Vertical Burn

Test Method: Two 10-second applications of a 3/4 inch Bunsen flame to a vertical piece of 1/2 inch wide plastic. The total burn time of both applications is added together. Test is repeated 10 times.

Criteria: V-2; Flame extinguishes self within 25 seconds per test strip. Drips are allowed to ignite cotton.

(Note: Firewall FRB extinguishes within 5 seconds. V-0 criteria requires flame extinguish within 5 seconds: however, drips can no ignite cotton.

For additional Technical information contact Coroplast.