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ROCKWOOL ROCKDUCT stone wool duct insulation (ProRox BL)

ROCKWOOL

ROCKWOOL ROCKDUCT stone wool duct insulation (ProRox BL)

ROCKWOOL stone wool blankets for air-conditioning and ventilation ducts, including kitchen exhaust and exhaust ducts, per ROCKWOOL Thailand's ROCKDUCT documents.

Thickness
25–50 mm
Density
40–80 kg/m³
Maximum service temperature
350–540 °C ASTM C411 / C447

Choose model and size

1. Choose thickness
2. Choose model (density)
3. Choose roll size (width × length)
4. Facing (foil or unfaced)

Foil facing is offered for some models and sizes only; we confirm what can be supplied together with the price.

Your selection

ROCKWOOL ROCKDUCT BL 938(40) ALU SA · Thickness 50 mm

Availability: Please enquire

Roll size (width × length)
1,200 × 7,500 mm120 × 750 cm
Density
40 kg/m³
Request a price for this size
Technical values for BL 938(40) ALU SA
Maximum service temperature
540 °C
Thermal conductivity (λ)at 50 °C mean
0.036 W/m·K

See all models and sizesManufacturer documentsTechnical specifications

Product details

Duct and HVAC insulationStone wool (rock wool)ROCKWOOL

Stone wool blankets for ducts, kitchen exhaust and exhaust ducts

Thickness
25–50 mm
Density
40–80 kg/m³
Maximum service temperature
350–540 °C ASTM C411 / C447
Thermal conductivity (λ)
0.036–0.039 W/m·K at 50 °C mean · ASTM C177

What is it?

ROCKDUCT is the name ROCKWOOL Thailand uses for its stone wool duct insulation. Per handout 200 602 it uses ProRox BL938(40) ALU-SA (40 kg/m³, aluminium-foil faced, 1,200 × 7,500 mm, 25 or 50 mm) and ProRox BL938-SA / BL958-SA (50 mm, 600 × 5,000 mm).

What is it made of?

Stone wool (rock wool) · Facing: BL 938(40) ALU SA: aluminium foil on one side · Blanket

Which sizes are available?

Thickness 25–50 mm · 40–80 kg/m³ — Choose model and size

Limitations to know

Installation details such as pins and metal jacketing depend on the duct design. Ask us on LINE for ROCKWOOL's handout.

Where does the data come from?

ProRox BL 938(40) ALU SA (ROCKDUCT Hi-Temp) — 200 351TH-03/21 V1 (EN)

Technical data from the manufacturer's documents ROCKWOOL · Checked 29 Sept 2026

Technical specifications

Technical values for each model from the manufacturer's data sheet. They apply to every thickness of that model unless a condition is given.

BL 938(40) ALU SA

Density
40 kg/m³
Maximum service temperature
540 °C
Thermal conductivity (λ)at 50 °C mean
0.036 W/m·K
Thermal conductivity (λ) at 150 °Cat 150 °C mean
0.057 W/m·K

BL 938 SA

Density
60 kg/m³
Maximum service temperature
350 °C
Thermal conductivity (λ)at 50 °C mean
0.039 W/m·K
Thermal conductivity (λ) at 150 °Cat 150 °C mean
0.057 W/m·K

BL 958 SA

Density
80 kg/m³
Maximum service temperature
450 °C
Thermal conductivity (λ)at 50 °C mean
0.039 W/m·K
Thermal conductivity (λ) at 150 °Cat 150 °C mean
0.054 W/m·K

All models

Reaction to fire
Euroclass A1 · ASTM E84 passed
Test standards and sources

Models and sizes available

Roll sizes 60 × 500 cm, 120 × 750 cm · thicknesses 25, 50 mm. Sizes differ by model — all are listed below.

BL 938(40) ALU SA · 40 kg/m³

Blanket with aluminium foil on one side for kitchen and exhaust ducts (ROCKDUCT Hi-Temp)

Thickness 25 mm

  • 1,200 × 7,500 mm120 × 750 cm 2 roll(s) / pack18.00 m²/packPlease enquire Ask price

Thickness 50 mm

  • 1,200 × 7,500 mm120 × 750 cm Please enquire Ask price

BL 938 SA · 60 kg/m³

Thickness 50 mm

  • 600 × 5,000 mm60 × 500 cm Please enquire Ask price
  • 1,200 × 7,500 mm120 × 750 cm Please enquireDistributor listing Ask price

BL 958 SA · 80 kg/m³

Thickness 50 mm

  • 600 × 5,000 mm60 × 500 cm Please enquire Ask price
  • 1,200 × 7,500 mm120 × 750 cm Please enquireDistributor listing Ask price

Pack quantities are based on sales information in Thailand. Please confirm the pack contents before ordering. Area per pack = roll size × rolls per pack.

Applications

Air-conditioning (HVAC)Ducts, refrigerant lines and HVAC noiseFactoriesFactory roofs, machine noise and hot pipework

Highlights

  • For ducts, kitchen exhaust and exhaust ducts
  • 40 kg/m³ foil-faced grade
  • Euroclass A1, non-combustible
  • System documents from ROCKWOOL Thailand

Manufacturer documents

ProRox BL 938(40) ALU SA (ROCKDUCT Hi-Temp) — 200 351TH-03/21 V1 (EN)Reference document · ask us on LINE for the file
Handout: ROCKWOOL insulation for HVAC ducts — 200 602-9/25 V8 (TH)Reference document · ask us on LINE for the file
ProRox BL 938 SA — 200 350TH-08/25 V4 (EN)PDF · ROCKWOOL (Thailand) · ENProRox BL 958 SA — 200 359TH-08/25 V4 (EN)PDF · ROCKWOOL (Thailand) · EN

Helpful before you choose

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