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Ryolex Loose-Fill Masonry Insulation


Loose-Fill Masonry Insulation is manufactured to meet the requirements of ASTM C549, Perlite Loose Fill Insulation.


Basic Use: RYOLEX® masonry fill is treated perlite that provides a quick, inexpensive and permanent method of efficiently insulating masonry walls. Depending upon design conditions, reductions in heat transmission of 50 percent or more may be obtained when perilte loose fill is used in the hollow cores of concrete block or cavity type masonry walls.

Limitations: RYOLEX® perlite loose fill insulation should be installed in well sealed cavities and masonry unit as Masonry fill logodescribed under the INSTALLATION section.

Composition and Materials: RYOLEX® perlite loose fill insulation is an inert volcanic glass expanded by a special heat process and treated to improve water repellency.

Texture and Color: Treated perlite insulation is a white granular material.

Applicable Standards: Treated perlite conforms with ASTM C 549 – Perlite Loose Fill Insullation; GSA Commercial Item Description A-S-903 Insulation-Thermal (Expanded Perlite). Acceptable in FHA Financed Housing-FHA Use of Materials Bulletin UM-37. Recommended by Brick Institute of America Techical Notes 21 and Expanded Shale, Clay and Slate Institute Bulletin No. 4 (July, 1972).

Technical Data Density: Recommended density range of 2-11 lbs/ft³ (32-176 kg/m³). ASTM C 520-Method of Test for Density of Granular Loose Fill Insulations.

Thermal Conductivity At Various Densities:

ASTM C177 – Method of Test for Thermal Conductivity of Materials by Means of the Guarded Hot Plate. Grading: US Standard Sieve No. 4 (4.75 mm); Retained by Weight (Cumulative) 5% Maximum.

ASTM C 136 – Standard Method of Test for Sieve analysis of Fine and Coarse Aggregates (When mechanical sieving device is used the sieving time should be 5 minutes and test sample should be 50 grams of material).

Noncombustable: In accordance with ASTM E 136 – Behavior of Materials in a Vertical Tube Furnace at 750°C.

Fire Rating: Underwriters’ Laboratories Design No. U905 shows that a 2-hour rated 8 inches (20.32 cm) concrete block wall is improved to 4 hours when cores are filled with treated perlite.

Water Repellency: Treated perlite minimizes water transmission. Laboratory tests on water transmission of Structural Clay Products Research Foundation show a cavity wall filled with treated perlite will not transmit water to the interior width even under the most severe conditions. Performance of overall wall was rated “excellent” in accordance with procedures established by the National Bureau of Standards in BMS 82. However, it should be noted that treated perlite insulation will not waterproof a pooly constructed masonry wall.

Permanency: Treated perlite is inorganic, and therefore, rot, vermin and termite resistant and non-combustible with a fusion point of approximately 2300°F (1260°C). It is as permanent as the walls which contain it.

Non-Settling: Perlite loose fill supports its own weight in the wall without settling.


INSTALLATION Location: The insulation must be installed in the following locations:

  • In the cores of all exterior (and interior) hollow masonry unit walls. Cinder blocks perlite
  • In the cavity between all exterior (and interior) masonry walls.
  • Between exterior masonry walls and interior furring.

The insulation must be poured directly into the wall at any convenient interval. Wall sections under doors and windows should be filled before sills are placed. All holes and openings in the wall through which insulation can escape must be permanently sealed or caulked prior to installation of the insulation. Copper, galvanized steel, or fiberglass screening must be used in all weep holes.

Method: Perlite loose fill insulation cuts installation costs since it is lightweight and pours easily and quickly in place without need for special installation equipment or skills. The insulation may be poured directly into walls or emptied into a ssimple wood or metal hopper which can be slid along the wall to direct the perlite into cores or cavities. Perlite loose fill is free flowing and fills all voids without bridging. WARRANTY Certificate of Conformance stating product conforms to the Standard Specifications for treated perlite loose fill insulation as adopted and published by Perlite Institute, Inc. is available from Silbrico.

MAINTENANCE: None Required

TECHNICAL SERVICES: Contact Silbrico technical sales for assistance and advice on design requirements.

FILLING SYSTEMS: Electronic SPEC-DATA7, SPEC-DATA7 II, Sweet’s Architectural Catalog File 07200/PEL

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Uses of Perlite


Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing. >>More