Hennepin County

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PROJECT QUESTION: MasterSeal 630 is a low molecular weight MMA bridge deck sealer manufactured by BASF . . .

Q: MasterSeal 630 is a low molecular weight MMA bridge deck sealer manufactured by BASF. Master Top SRS 41 P is a high molecular weight MMA sealer manufactured by BASF. A low molecular weight sealer is more costly to manufacture (40-50% more), but does penetrate more deeply. Most of the other companies on the spec only make the high molecular weight MMA.

A: As indicated in SB-7.2 HMWM Flood Seal, B. General, Kwikbond KBP 103/204/Flex 30 or MnDOT approved methyl methacrylate will be allowed. The list of MnDOT Approved/Qualified Products can be found at http://www.dot.state.mn.us/products/bridge/bridgesurfacecracksealer.html under the 'Deck Flood Method Methyl Methacrylate (MMA) Resin Crack Sealers.' Products not listed in SB-7.2 or on the MnDOT Approved/Qualified Products list would need to successfully complete the MnDOT Qualification Procedure to be approved for project use.