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BA890 BlastSealant Acoustic Sealant
Permanent Flexible Acoustic Sealant — Low VOC, Non-Flammable
BA890 BlastSealant is the acoustic sealant specifically formulated for soundproofing installations. Permanently flexible, non-flammable, low VOC (28 g/l). Seals gaps and joints in walls, floors, ceilings, and around penetrations to maintain the full STC rating of your acoustic assembly.
Sound travels through air with very little resistance. A gap of just 1mm at the perimeter of an acoustic assembly — where a wall meets the floor, where a partition meets a structural column, or around a pipe penetration — can reduce the effective STC rating of that assembly by 10 to 15 dB or more. This is why acoustic sealant is not optional in a properly designed soundproofing system; it is the element that closes the final gaps and allows the barrier material to perform at its rated level. BA890 BlastSealant is formulated specifically for this purpose. Unlike construction caulks and general-purpose sealants that become brittle and crack over time, BA890 remains permanently flexible, accommodating the natural movement of building structures without breaking the acoustic seal. The low VOC formula of just 28 g/l makes it safe for use in occupied and sensitive environments including hospitals, schools, and residential buildings. The black color is designed to be inconspicuous when applied at the base of walls or around penetrations. Full cure is achieved within 72 hours at standard conditions, after which the sealant maintains its performance indefinitely.
Technical Specifications
- Color: Black
- VOC: 28 g/l (<1% by weight)
- Cure Rate: 2–3mm depth per 24 hours at 23°C, 50% RH
- Full Cure: 72 hours
- Flammability: Non-flammable
- Weather Resistance: Artificial weathering tested
- Water Resistance: Yes — waterproof once cured
Features & Performance
- Permanent flexible acoustic seal — never becomes brittle
- Non-flammable — safe for fire-rated assemblies
- Low VOC: 28 g/l — safe for occupied buildings
- Prevents STC degradation at gaps, joints, and penetrations
- Weathering and water resistant once cured
- Easy application from standard caulk gun
- Black color — inconspicuous at wall bases and transitions
- Compatible with all BlastBlock MLV products
Applications
Frequently Asked Questions
Why is acoustic sealant necessary in a soundproofing installation?
Even a 1mm gap at the perimeter of a wall or around a penetration can reduce the STC performance of your entire assembly by 10 dB or more. Sound travels through air far more easily than through any solid material. BA890 closes these gaps permanently, allowing your BB830 MLV barrier to achieve its full rated STC performance. Acoustic sealant is the last step that ties the complete system together.
Is BA890 suitable for fire-rated assemblies?
Yes. BA890 BlastSealant is non-flammable and suitable for use in fire-rated wall and ceiling assemblies. It does not compromise fire ratings when used at perimeter joints and non-penetration seams. For through-penetrations in fire-rated assemblies, combine BA890 with BA650 putty pads for complete acoustic and fire protection at every opening.
How is BA890 different from standard construction caulk?
Standard construction caulks are typically designed for air sealing and weather-proofing, not acoustic performance. They may harden over time, crack, and allow gaps to re-open. BA890 is permanently flexible — it accommodates the natural movement of building structures without loss of acoustic seal. Its formulation is optimized for acoustic applications, and it remains effective for the lifetime of the building.
Other BlastBlock Products
- BB830 Acoustic Optimized MLV — The Original Acoustic Optimized Mass Loaded Vinyl — STC 32 dB
- BB830FR Fire-Rated Acoustic MLV — Fire-Rated Acoustic MLV with ASTM Test Reports — STC 28 dB
- BB830LF Heavy-Duty Low Frequency MLV — Heavy-Duty Low Frequency Sound Insulation — Rw 32 dB, 10 kg/m²
- BB460 Sound and Vibration Proofing Material — Dual-Function: Sound Blocking + Vibration Dampening