PVC vs Hypalon — Material Guide for Inflatable SUP Boards

Material Overview

PVC (Polyvinyl Chloride)

PVC is the standard fabric for inflatable SUP boards. For board construction it is typically reinforced with a polyester scrim (1,100 – 1,680 DTEX) and coated on both sides, then fusion-welded around a drop-stitch core. Modern marine PVC formulations include UV stabilizers and plasticizers to improve flexibility and weather resistance, and boards built this way hold working pressures of 12 – 15 PSI.

Hypalon (CSM – Chlorosulfonated Polyethylene)

Hypalon is a synthetic rubber compound (now produced generically as CSM after DuPont discontinued the Hypalon trademark). It is renowned for exceptional UV and ozone resistance, making it the preferred fabric for professional and commercial inflatable boat tubes that spend extended periods in direct sunlight. On SUP boards, Hypalon is rarely used — boards demand high-pressure, dimensionally stable decks that PVC and drop-stitch construction deliver at a fraction of the weight.

Side-by-Side Comparison

Property	PVC	Hypalon (CSM)
UV resistance	Good (with stabilizers)	Excellent (inherent)
Abrasion resistance	Good	Very good
Tensile strength	3,000 – 5,000 N/5cm	2,500 – 4,000 N/5cm
Weight (per m²)	850 – 1,200 g	1,100 – 1,500 g
Cold flex (low temp)	-30°C	-20°C
Repairability	Easy (heat weld or adhesive)	Requires special CSM adhesive
Joining method	RF welding, hot air welding	Hand gluing (contact cement)
Cost (material)	$8 – $15 / m²	$20 – $40 / m²
Lifespan (tropical sun)	5 – 8 years	10 – 15 years

Which Should You Choose?

Choose PVC When:

• You are building inflatable SUP boards (PVC + drop-stitch is the industry standard)
• Board weight matters — PVC is 15 – 25% lighter
• You need cold-weather flexibility below -20°C
• You want a wider range of color and finish options
• You need high working pressure (12 – 15 PSI) for a rigid, stable deck

Choose Hypalon When:

• The product will be moored or stored in direct sunlight for years at a time
• You are in a tropical or high-UV environment with no storage option
• Maximum durability and lifespan outweigh weight and cost
• You are building professional or commercial craft such as boat tubes
• Abrasion from sand, concrete, or docks is a primary concern

Manufacturing Differences

PVC boards are manufactured using RF (radio frequency) welding or hot air welding, which creates a molecular bond between the coated fabric layers. This allows for automated, consistent production with high throughput, and precise seam strength on high-pressure boards. Hypalon is assembled using hand-gluing with contact cement; each seam is manually rolled and pressed, making Hypalon production more labor-intensive and suited to low-pressure tube construction.

Afarer Recommendation

For inflatable SUP boards, modern high-quality PVC with UV stabilizers offers the best balance of cost, weight, performance, and durability. Afarer builds every SUP with 1,680 DTEX marine PVC, a three-layer coating, and a drop-stitch core rated to 15 PSI — with each fabric batch independently tested in our PVC Fabric Lab before production. Hypalon remains available on request for commercial craft and special applications, produced separately through our commercial marine line.

Material choice shapes cost, weight, and durability of your line - tell us your target market and we will specify the right fabric for your OEM project, tested in our material testing lab.