VL65 Acoustic Membrane

An MLV type acoustic membrane with improved low frequency performance. Ideal for upgrading lightweight partitioning. VL65 can also used in tuned basstrap construction.

VL65 can give an additional +6dB when used in a stud wall buildup with +8dB at 160Hz.

Sold per roll or per pallet of 30 rolls.


17 in stock


VL65 Acoustic Membrane

  • Easy to use, cut and trim
  • Supplied in roll form: 6m x 1m
  • Airborne noise reduction
  • Very high acoustic performance
  • Improved low frequency performance
  • Also acts as a VCL
Product description

VL-65 acoustic membrane is a high mass, visco-elastic acoustic damping membrane with the added advantage of improved low frequency performance over our other acoustic membranes. It is internally reinforced with a micro fibreglass carrier for improved dimensional stability.

  • Soundproofing against airborne noise in floors, walls and ceilings when used in conjunction with other low surface density materials.
  • VL-65 is acoustically equivalent to lead of the same surface weight.
  • When bonded between stiff rigid sheet materials it greatly reduces the resonance and coincidence dips.
  • Stapled over frameworks it greatly improves the performance of lightweight partitions.
  • When bonded to resonating metal panels it greatly reduces vibration and re-radiated noise.
  • Offers high acoustic performance when combined with sound absorbent materials.
  • Can be used for damping of impact noise caused by atmospheric agents on metal deck roofs.
Acoustic Performance

VL65 octave band sound transmission loss

Hz 50 63 80 125 250 500 1k 2k 4k Rw
R dB 18 19 11 17 21 24 29 34 39 28
Test Report Number: 130702/002
Technical Data
VL-65 Technical Data
Density 1.9g/cm(+/-0.05)
Colour Black
Roll Size 6m x 1m
Weight 6.5kg/m2
Thickness 4mm
Fire Resistance >B,s1,d0 when used in partitions as shown below
Water Vapour resistance (µ) 50000
Maximum tensile strength 350 ±150 / 250 ± 100 EN 12311-1
Elongation ±45 EN 12311-1
Cold Flexibility -10°C; EN1109
High Temperature flow resistance 120°C; EN1110

VL65 Acoustic Membrane eliminates the coincidence dip around 2.5kHz found in rigid sheet materials such as plasterboard on studwork by 12dB.

The tests below show standard studwall constructions with and without VL65 Acoustic Membrane sandwiched between the sheets.

The low frequency resonance dip at around 160Hz is reduced by 8dB.

This superb material will improve the overall averaged Rof a stud partition, as shown below, by 6dB.

VL65 Acoustic Membrane in separating stud wall

vl65 sound transmission loss for internal partition

VL65 Acoustic Membrane in internal stud wall

vl65 sound transmission loss for separating partition