Sejal Architectural Glass Ltd. Supplies Insulating Tone Glass for Acoustic Insulation. Sejal Architectural Glass Ltd. Is an ISO 9001:2000 certified company. The Insulating Tone Glass for Acoustic Insulation comes with different sound characteristics. With the help of Tone Glass, sound attenuations of up to 50dB can be achieved. The units could be configured with high performance glasses to achieve thermal insulation with acoustic insulation for special requirements. In addition, the performance can be optimized for specific frequency bands. Insulating Tone Glass for Acoustic Insulation with laminated glass provides safety, security, fading control and acoustic insulation.