SHEERFILL® IIA

SHEERFILL® is the trademark for a family of membranes used in permanent structures.

The composite is made of fiberglass and polytetrafluoroethylene (PTFE). SHEERFILL products are available in a range of strengths and light transmission levels, providing the user with a choice of membranes to cover virtually any size structure from a full-sized stadium to a relatively small skylight. All SHEERFILL membranes conform to rigid fire and building codes for permanent buildings.

Typical Properties*

Property	Value	Method
Coated Fabric Weight (oz./yd.²)	38 nominal	ASTM D4851-88
Thickness (mils)	28 nominal	ASTM D4851-88
Breaking Strength (lb./in.) (Strain Rate: 2 in./min.)		ASTM D4851-88
Dry, Warp	640 min. avg.
Dry, Fill	640 min. avg.
Breaking Strength After Crease Fold (lb./in.)		ASTM D4851-88
Dry, Warp	475 min. avg.
Dry, Fill	380 min. avg.
Trapezoidal Tear (lb.)		ASTM D4851-88
Warp	60 min. avg.
Fill	70 min. avg.
Solar Transmission (%)	16.0 nominal	ASTM E424
Solar Reflectance (%)	72.5 nominal	ASTM E424
Burning Characteristics
Flame Spread	5 max.	ASTM E84
Smoke Generation	20 max.	Tunnel Test
Incombustibility of Substrates	Pass	ASTM E136
Fire Resistance	Pass	ASTM E108
Flame Resistance	Pass	NFPA 701, Small Scale
Color	White (after exposure to sunlight)
Reinforcement Construction	Warp β150 4/2, Fill β150 4/2-Count W20 x F20

* Values listed are for virgin roll goods only. Appropriate industry safety factors need to be used to account for the in-service effects of handling, weathering, etc.