Cast polyurethane elastomer raw material for encapsulating and coating dumbbells and gym weights. Poured over a cast-iron or steel core, the tough PU skin is non-marking, odorless and impact-quiet — far more durable and pleasant than rubber, with a smooth, attractive finish in any colour. Hardness, colour and surface texture are tuned to your product via prepolymer + chain-extender formulation.
A85–95
Hardness Shore
20–80
Abrasion loss mm³
Odorless
vs rubber smell
Non-mark
floor-friendly finish
Any colour
custom pigmenting
Key Features
Encapsulates the iron core Bonds firmly over cast-iron / steel weights for a seamless, durable PU skin.
Non-marking & floor-friendly Won’t scuff or scratch gym floors, unlike bare iron or some rubbers.
Impact-quiet Dampens the clang when weights are set down — quieter studios and gyms.
Odorless & clean No rubber smell, doesn’t collect dust or leave marks on hands — better feel.
Abrasion & impact resistant Tough PU skin withstands repeated drops and daily commercial-gym use.
Custom colour & hardness Any pigment colour and Shore A 85–95 hardness; logo embossing on the mould. OEM/ODM.
Applications
PU Dumbbell SetsCommercial Round DumbbellsFixed PU Dumbbells
The same PU system also encapsulates kettlebells, weight plates and barbell ends for a complete commercial gym-weight range.
Technical Specifications
Property
Range
Test Method
Hardness
Shore A 85–95 (typical for dumbbells)
ASTM D2240
Tensile strength
20–55 MPa
ASTM D412
Elongation at break
250–650%
ASTM D412
Abrasion resistance
20–80 mm³
DIN 53516
Tear strength
60–120 kN/m
ASTM D624
Rebound resilience
35–55%
ASTM D2632
Surface
Non-marking, odorless; any pigment colour
—
Operating temperature
−40 °C to +120 °C
ISO 9142
Parameters customizable by formulation; typical values for reference, not a binding specification.
How Dumbbells Are Made
1
Prepare core Place the cast-iron / steel dumbbell core and handle into the mould; prime for bonding.
2
Mix & pigment Meter and mix the PU system with your chosen colour pigment.
3
Cast & cure Pour over the core; the PU encapsulates the weight and cures to the target hardness.
4
Demould & finish Demould the finished dumbbell with a smooth, logo-embossed, non-marking surface.
Packaging, Storage & Handling
Packaging Prepolymer and curative supplied in iron drums; palletised for export. Bulk on request.
Storage Store sealed in a cool, dry, ventilated area away from moisture. Shelf-life details on request.
Handling & Safety Avoid eye/skin contact; wear safety glasses. Wash skin with soap and water; flush eyes with water and seek medical attention. Full MSDS on request.
One-Stop PU Elastomer Solution
Beyond raw materials, BlendPolyol provides matched equipment and tooling — a complete production-line partner, not just a chemical supplier:
10+ years in PU raw materials Specialised PU elastomer & polyol manufacturer serving industry worldwide.
Custom colour & hardness Any pigment and Shore hardness, with logo embossing on the mould.
Equipment integration Casting machines, mixing systems and dumbbell moulds as a complete solution.
Global export & fast reply Export to EU, Latin America, Asia and beyond — we respond within 24 hours.
From Sample to Bulk Order
1. Share your spec Tell us your dumbbell type, hardness, colour and volume — we recommend a formula.
2. Sample & validate Trial-cast over your cores; we fine-tune hardness, colour and surface finish.
3. Scale to bulk Confirm the formula and order in bulk with flexible MOQ and tiered lead times.
Frequently Asked Questions
Why PU instead of rubber for dumbbells?PU is odorless, non-marking and doesn’t collect dust; it’s tougher and more abrasion-resistant, giving a cleaner feel and longer life in commercial gyms.
Can you match a colour and emboss our logo?Yes — any pigment colour, and your logo / weight markings embossed via the mould.
What hardness is used for dumbbells?Typically Shore A 85–95 — firm enough to protect the iron core and resist scuffing, with a comfortable feel. Tunable to your preference.
Does it work for kettlebells and weight plates too?Yes — the same PU system encapsulates kettlebells, weight plates and barbell ends. OEM/ODM supported; request a sample and TDS, we reply within 24 hours.
Need PU raw material for dumbbells & gym weights?
Get a tailored formulation, full TDS & MSDS, and a sample for casting validation.
✓ Custom colour & hardness✓ Logo embossing✓ Reply within 24 h
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