Description Armaflex Rubber Insulation Sheet is a high-performance closed-cell elastomeric insulation designed for HVAC, refrigeration, and mechanical systems. It delivers superior thermal efficiency, condensation control, and long-term durability. Contractors and engineers trust Armaflex for chilled water pipes, duct insulation, VRF systems, and cold room applications across Kenya. We supply Armaflex in both Plain (non-foil) and Aluminium Foil-faced options. The foil version adds extra vapour protection and gives a clean, professional finish for exposed ductwork. Available Sizes of Armaflex Rubber Insulation We stock the following standard roll sizes: 8m x 1m x 25mm (1”) 10m x 1m x 19mm (3/4”) 14m x 1m x 13mm (1/2”) Each roll comes in 1 metre width for easy cutting and installation on ducts and flat surfaces. Key Technical Features of Armaflex Rubber Insulation Closed-Cell Structure: Armaflex uses a dense closed-cell structure. It blocks moisture penetration and prevents condensation buildup. It reduces the risk of corrosion under insulation. Low Thermal Conductivity: The material delivers excellent thermal performance with a k-value of approximately 0.033 W/m·K at 35°C. It reduces energy loss and improves system efficiency. Wide Temperature Range: Armaflex performs effectively over the temperature range of -40°C to 120°C. It suits both cold- and hot-service applications. High Vapour Resistance: The insulation offers extremely high water vapour diffusion resistance. It controls sweating on chilled pipes and ducts in humid environments like Nairobi and coastal regions. Fire Safety Performance: Armaflex is self-extinguishing. It meets international fire performance standards. It reduces flame spread and enhances building safety. Plain vs Foil Armaflex – Which One to Choose? Plain Armaflex Rubber Insulation Sheet Flexible and easy to wrap around curved surfaces Ideal for concealed installations Suitable for pipe lagging and internal duct insulation Foil-Faced Armaflex Insulation Sheet Features reinforced aluminium foil facing Enhances vapour barrier performance Provides a neat finish for exposed ducts Adds surface protection against mechanical damage Choose foil-faced insulation for visible duct systems. Choose plain sheets for concealed or internal installations. Thickness Applications Guide 13mm (1/2”) – 14m x 1m Roll Use for: Mild climate HVAC systems Internal duct insulation Residential air conditioning systems Size: 19mm (3/4”) – 10m x 1m Roll Use for: Commercial HVAC systems Chilled water lines Medium-load refrigeration Size: 25mm (1”) – 8m x 1m Roll Use for: High condensation risk areas Cold rooms Industrial refrigeration Data centres and pharmaceutical facilities Thicker insulation improves thermal resistance and condensation control. Benefits of Armaflex Rubber Insulation Sheet Reduces energy loss Prevents pipe sweating Controls condensation Minimizes noise and vibration Resists fungi and bacteria CFC and HCFC-free Low VOC emissions Easy to cut and install Applications of Armaflex Insulation Sheet Use Armaflex Rubber Insulation Sheet for: HVAC duct insulation Chilled water systems Refrigeration piping VRF and split unit systems Industrial process lines Mechanical plant rooms Choose Armaflex Rubber Insulation Sheet – Plain or Foil – for reliable, energy-efficient thermal insulation in Kenya at Gypsum Ceiling Supplies Ltd. It delivers durability, safety, and long-term performance for professional mechanical installations. Armaflex Rubber Insulation Sheet – Technical Data General Properties S/No Specification Value / Index Test Method Standard 1 Material NBR — — 2 Cell Structure Closed Cell — — 3 Density 50 – 80 kg/m³ ASTM C 302:1995 / ASTM D 3575-91 BS EN 1602:2013 4 Thermal Conductivity (k) @ 35°C 0.033 W/m·K ASTM C518 BS 874:1986 5 Temperature Range -40°C to 120°C ASTM C534 — 6 Thermal Stability (% Shrinkage) 2.54% (7 days at 105°C) ASTM D 3575-91 — 7 Flexibility Excellent ASTM D1056-85 — 8 Water Absorption 2.98 ASTM D 3575-91 — 9 Water Vapour Permeability 0.00 Perm-in ASTM E96/E96M Meets BS 5422:2009 10 Water Vapour Diffusion Resistance (µ) >7300 BS EN 12086 — Reaction to Fire S/No Specification Value / Index Test Method Standard 11 Flammability Self Extinguishing ASTM D 635-91 — 12 Fire Rating Class 0, Class 1 (25/50 Rated) BS 476 Part 6 & 7 / ASTM E84 UL 723 13 Average Time of Burning Less than 4 Seconds ASTM D1149 — 14 Average Extent of Burning 15 mm ASTM D1149 — Environmental Properties S/No Specification Value / Index Test Method Standard 15 GWP / ODP Excellent ASTM D1149 ASTM D1171 16 Resistance to Weather & UV Excellent ASTM G154 / ASTM G155 ASTM G23 17 Resistance to Fungi / Mildew No Fungal Growth ASTM G21 ASTM C1338 18 Resistance to Bacteria Negligible ISO 22196 ASTM E2180 19 Resistance to Corrosion pH Neutral ASTM C692 EN 13468 20 Dust, Fibre & Asbestos Free EPA 600 — 21 CFC & HCFC Free GC-MS — 22 Odour Negligible SAE J1351 — 23 Resistance to Chemicals Excellent ASTM C871 — 24 Leachable Chlorides <0.05 (Water-soluble chloride ions) ASTM C692 / DIN 1988 EN 13468 25 VOC Emission Very Low (<6 µg/m³) ASTM D5116 — Acoustic Properties S/No Specification Value Test Method 26 Sound Absorption Coefficient (NRC) – 13mm 0.38 ASTM C423 26 Sound Absorption Coefficient (NRC) – 25mm 0.49 ASTM C423 26 Sound Absorption Coefficient (NRC) – 50mm 0.55 ASTM C423 27 Sound Transmission Class (STC) 6 (Insulation) / 38 (Insulation Adhered to Steel Duct) ASTM E90 Storage Specification Value Storage Life 1 Year Storage Condition Store in dry, clean & ventilated space Specification Compliance Standard Classification / Notes ASTM C518 Class 1 ASTM D1056-00-2C1 Class 0 BS 476 Part 6 Complies (UK requirement) BS 476 Part 7 Surface spread of flame – Class 1 ASTM E84 25 / 50 Rated Related
