What Is the Difference Between 200 GSM and 120 GSM Tarpaulin Sheet in South Africa?

Walk into any hardware or industrial supply store in South Africa and you will find tarpaulin sheets listed with a GSM rating. Most buyers look at the price and the size — and ignore the GSM entirely. Then they get the tarpaulin on site and realise it is either too flimsy for what they needed or heavier than the application required.

GSM is the single most important specification for a tarpaulin sheet. It determines durability, load capacity, weather resistance, and how long the tarpaulin will last in the specific conditions it is used in. Getting it wrong means replacing the tarpaulin earlier than you should — and sometimes it means the tarpaulin fails when you need it most.

At Allrich Trading, we supply tarpaulin sheets across Johannesburg, Cape Town, and Durban in a range of GSM ratings for industrial, agricultural, and commercial applications across South Africa. Here is what the difference between 120 GSM and 200 GSM actually means in practice.

What Does GSM Mean on a Tarpaulin Sheet?

GSM stands for grams per square metre. It is the measurement of how much a one square metre piece of the tarpaulin material weighs. A higher GSM means a heavier, denser material — more fabric, more coating, and more structural integrity per square metre of tarpaulin.

It is not the only factor that determines tarpaulin quality — the weave density, the PE coating thickness, and the reinforcement at the edges and eyelets all play a role. However, GSM is the quickest indicator of where a tarpaulin sheet sits on the durability spectrum. A 200 GSM tarpaulin is a fundamentally different product from a 120 GSM tarpaulin — not just heavier, but built for different applications.

120 GSM Tarpaulin Sheet — What It Is and Where It Works

120 GSM is a lightweight tarpaulin specification. The material is thin, flexible, and easy to handle — it folds compactly, weighs very little, and can be managed by one person without effort. These properties make it practical for applications where portability and ease of handling matter more than maximum durability.

In South Africa, 120 GSM tarpaulin sheet is the right choice for:

Temporary light-duty covers — protecting furniture, equipment, or materials from light rain or dust during a move or short-term storage. The tarpaulin does not need to withstand sustained weather exposure or heavy load — it just needs to provide basic protection for a limited time.

Indoor dust and paint protection — covering floors, fixtures, and furniture during renovation work. A 120 GSM tarpaulin is light enough to drape easily over irregular shapes and flexible enough to tuck into awkward corners. Durability is not the priority here — coverage is.

Agricultural shade netting applications — where a lightweight material is needed to create temporary shade without the structure needing to bear significant load or weather sustained wind.

Event and market stall ground covers — where the tarpaulin is laid flat on the ground as a clean working surface. Ground exposure does not demand the same durability as overhead weather protection.

What 120 GSM tarpaulin is not suited for: sustained outdoor weather exposure, applications where the tarpaulin will be under tension or load for extended periods, or environments where UV degradation is a concern. Lightweight tarpaulin at 120 GSM thins and degrades faster under continuous South African sun than heavier specifications.

200 GSM Tarpaulin Sheet — What It Is and Where It Works

200 GSM is a medium-to-heavy duty tarpaulin specification. The material is noticeably thicker and stiffer than 120 GSM — more substantial in hand, significantly more resistant to tearing, and considerably more durable under sustained load and weather exposure.

The higher GSM means more PE material per square metre, a denser weave structure, and typically a heavier coating on both surfaces. The result is a tarpaulin that handles the conditions that destroy lightweight specifications within weeks.

In South Africa, 200 GSM tarpaulin sheet is the right choice for:

Outdoor weather protection over extended periods — covering machinery, vehicles, building materials, or stockpiles that will be exposed to South African rain, wind, and UV radiation for weeks or months. The denser material and heavier coating hold up significantly longer than lightweight tarpaulin under these conditions.

Construction and building site applications — covering scaffolding, protecting partially completed structures from rain, and securing material stockpiles. Construction environments are rough on tarpaulins — foot traffic, sharp edges, heavy loads placed on the tarpaulin, and sustained weather exposure all demand a heavier specification.

Agricultural and farm applications — covering hay bales, equipment, and stored produce for extended periods in South Africa's variable outdoor conditions. Gauteng's summer hailstorms, the Western Cape's winter rain, and KwaZulu-Natal's subtropical humidity all test tarpaulin durability in different ways. A 200 GSM tarpaulin handles all of these environments more reliably than a 120 GSM equivalent.

Truck and transport covers — securing and protecting loads in transit across South Africa. Truck tarpaulins need to withstand wind load at highway speeds, vibration, and repeated folding and unfolding. 200 GSM provides the structural integrity that lightweight tarpaulin cannot maintain under these conditions.

Shade structures and overhead covers — where the tarpaulin is under tension between anchor points and exposed to wind load. A tarpaulin that is stretched and loaded performs very differently from one that is simply draped over a surface. At 200 GSM, the material has the structural integrity to maintain tension without distorting or tearing at the eyelet points.

Side by Side — 120 GSM vs 200 GSM Tarpaulin Sheet

What About GSM Ratings Between 120 and 200?

The market does not jump directly from 120 GSM to 200 GSM. There are intermediate specifications — 150 GSM and 180 GSM are both commonly available in South Africa — that sit between the two extremes.

150 GSM is a light-to-medium specification. It handles short-term outdoor exposure better than 120 GSM but is not built for the sustained outdoor conditions that 200 GSM handles comfortably. A reasonable choice for applications that are mostly indoor or short-term outdoor with occasional exposure.

180 GSM is a medium-duty specification — closer to 200 GSM in performance than to 120 GSM. It suits applications where a full 200 GSM is slightly over-specified but 150 GSM is insufficient. Agricultural covers, temporary outdoor storage, and light construction protection are all reasonable applications for 180 GSM tarpaulin.

For most South African buyers choosing between lightweight and heavy-duty — 120 GSM for indoor and light temporary use, 200 GSM for sustained outdoor and heavy-duty applications is the simplest and most reliable rule.

Tarpaulin Sheet Supply Across Johannesburg, Cape Town and Durban

Johannesburg's large construction, industrial, and agricultural sectors create consistent demand for tarpaulin sheet across all GSM ratings — from lightweight covers for short-term site protection to heavy-duty specifications for sustained outdoor storage across Gauteng's variable climate. Allrich Trading supplies Johannesburg buyers with tarpaulin sheets in the right GSM specification for each application.

Cape Town's construction and agricultural sectors — particularly the wine farming and fruit growing operations across the Western Cape — have specific tarpaulin requirements driven by the region's winter rain and summer heat. Allrich Trading supplies Cape Town and the broader Western Cape with tarpaulin sheets suited to the region's seasonal conditions.

Durban's industrial, agricultural, and logistics sectors operate in KwaZulu-Natal's subtropical coastal environment — where humidity, heavy summer rain, and salt air all affect tarpaulin performance. Allrich Trading supplies Durban buyers with tarpaulin sheet specifications suited to KwaZulu-Natal's coastal conditions.