Shade Percentage vs GSM: Why These Two Shade Net Specifications Should Not Be Confused

Shade Percentage vs GSM: Why These Two Shade Net Specifications Should Not Be Confused

Shade percentage and GSM answer different questions. Confusing them can lead to a net that is heavier than expected but blocks the wrong amount of light—or provides the desired shade but lacks the handling characteristics required for the installation.

What shade percentage means

Shade factor is the percentage of incident light not transmitted through the net under a defined test. A 50% shade net is intended to block about half the measured light in that test context. It does not promise a 50% fall in air temperature, roof temperature or energy load.

What GSM means

GSM means grams per square metre: the mass of one square metre of fabric. It is useful for checking material consistency, roll weight and conformance with a declared construction. It does not directly state how much light is blocked.

Why the numbers do not map one-to-one

Two nets can have similar GSM but different shade factors because yarn width, filament diameter, mesh geometry, colour and knitting pattern differ. Conversely, two nets with similar shade factors can have different mass and mechanical behaviour. Our shade-net colour guide explains why colour must also be evaluated separately.

What to put in a purchase specification

• Nominal shade factor and applicable test method
• Construction: tape, mono or combined
• Mass per square metre and tolerance
• Width, length and dimensional tolerance
• Colour and intended application
• Breaking or bursting performance where relevant
• Retention of strength after UV exposure

BIS testing schedules treat mass, dimensions, shade type and strength as separate requirements. Buyers should do the same. Use shade factor to plan light reduction, GSM as one construction-control measure, and strength and UV evidence to assess durability. Review Sunsafe’s shade-net range or contact our team for specification support.

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