SHEERFILL® I-HT

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)	45.5 nominal	ASTM D4851-88
Thickness (mils)	36.0 nominal	ASTM D4851-88
Breaking Strength (lb./in.) (Strain Rate: 2 in./min.)		ASTM D4851-88
Dry, Warp	975 min. avg.
Dry, Fill	900 min. avg.
Breaking Strength After Crease Fold (lb./in.)		ASTM D4851-88
Dry, Warp	760 min. avg.
Dry, Fill	735 min. avg.
Trapezoidal Tear (lb.)		ASTM D4851-88
Warp	95 min. avg.
Fill	120 min. avg.
Solar Transmission (%)	10 nominal	ASTM E424
Solar Reflectance (%)	70 nominal	ASTM E424
Burning Characteristics
Flame Spread	5 max.	ASTM E84
Smoke Generation	5 max.	Tunnel Test
Incombustibility of Substrates	Pass	ASTM E136
Fire Resistance of Roof Coverings Burning Brand	Class A	ASTM E108
Flame Resistance	Pass	NFPA 701, Small Scale
Color	White (after exposure to sunlight)
Reinforcement Construction	Warp β150 4/3, Fill β150 4/3-Count W18 x F19

* 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.