SCG GTB-G glass-wool duct liner

Glass-wool board for lining the inside of air-conditioning ducts, faced with black glass tissue; it absorbs air and fan noise travelling along the duct.

Thermal conductivity (λ): 0.032 W/m·K 48 kg/m³ at 24 °C mean (test standard not stated)
Service temperature range: 4 – 230 °C

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Manufacturer documents Technical specifications

Product details

Duct and HVAC insulationGlass wool (fibreglass)SCG

Green glass-wool board faced with black glass tissue · for lining ducts

Thermal conductivity (λ): 0.032 W/m·K 48 kg/m³ at 24 °C mean (test standard not stated)
Service temperature range: 4 – 230 °C

What is it?

SCG GTB-G is a semi-rigid green glass-wool board faced on one side with black glass tissue. It lines the inside of ducts to absorb noise carried along them, with the faced side towards the airstream. The maker states it is for air velocities up to 10 m/s (2,000 fpm) and 4–230 °C. Density 48 kg/m³; 25 and 50 mm thick.

What is it made of?

Glass wool (fibreglass) · Facing: Black glass tissue · Board

Limitations to know

The maker states a maximum air velocity of 10 m/s (2,000 fpm) and a temperature range of 4–230 °C.

Where does the data come from?

SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner)

Technical data from the manufacturer's documents SCG · Checked 12 Oct 2026

Technical specifications

All values come from the manufacturer's documents, with conditions and test standards. Values the documents do not state are not shown.

Property	Value	Conditions / standard	Source
Thermal conductivity (λ)	0.032 W/m·K	48 kg/m³ at 24 °C mean (test standard not stated)	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 10
Service temperature range	4 – 230 °C	—	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 9
Maximum air velocity	10 m/s (2,000 fpm)	—	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 9
Facing	Black glass tissue	—	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 10
Reaction to fire	FS < 25 · SD < 50	flame spread / smoke developed (surface burning characteristic) · ASTM E84	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 11
Moisture sorption	0.2% by volume	ASTM C1104	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 11
Mould or fungus growth	Will not support or promote	ASTM C665	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 11
Standards / certification	Made to TIS 486, 487 and ASTM standards	The catalogue notes that certifications are available for selected products	SCG thermal insulation catalogue for air-conditioning and industrial work (pages 8–11: duct liner), p. 9

Applications

Air-conditioning (HVAC)Ducts, refrigerant lines and HVAC noise

Highlights

Faced with black glass tissue
Absorbs noise inside ducts
48 kg/m³; 25 and 50 mm thick

Installation overview

Line every side of the duct section designed to be lined, with board joints butted tight
Face the facing towards the airstream; apply adhesive to at least 90% of the board area on the duct side
Add enough mechanical fasteners for the duct size
Cut boards to the inner duct size with a sharp knife so edges and facing are not damaged

Always follow the manufacturer's installation and safety instructions.