SPC-8025 is a two-component MDI-based polyurethane foam system developed specifically for making foam earplugs. Pre-mixed with foaming agent, it offers a wide processing window and a rebound (recovery) time adjustable from 5 to 80 seconds — the slow, controlled expansion that lets an earplug be rolled down, inserted, then expand to seal the ear canal for comfortable, effective noise isolation. Soft yet strong, skin-friendly and easy to colour.
5–80 s
rebound time adjustable
100:50
A : B mixing ratio
≥ 35
Core density kg/m³
≥ 90%
closed-cell content
2-part
MDI polyol + iso
Key Features
Adjustable slow expansion Rebound time tunable 5–80 s — roll, insert and let it expand to seal the ear canal.
Effective noise isolation Conforms to the ear canal for a personalised, sound-sealing fit.
Soft & skin-friendly Comfortable hand-feel for extended wear; generally hypoallergenic.
Strong & durable Tensile strength ≥ 250 kPa and compressive strength 200 kPa hold shape for reusable plugs.
Colourable & mouldable Produced in bright colours and many ear-canal sizes and shapes.
Applications
Colourful Foam EarplugsSleep & TravelRaw Material & Fit
Used to make foam earplugs for sleep & travel, industrial & construction hearing protection, study / focus, shooting ranges and swimming. Available in many colours, sizes and corded / uncorded styles.
Technical Specifications
Item
SPC-A8025 (polyol)
SPC-B8025 (iso)
Physical state
Transparent liquid
Brown liquid
Viscosity (25 °C, mPa·s)
2400
120 ± 50
Gravity (20 °C, g/ml)
1.15 ± 0.1
1.23–1.25
Reactivity & Foam Property
Specification
Mixing ratio (A : B)
100 : 50
Cream time
10–15 s
Gel time
45–60 s
Free rise time
50–80 s
Rebound (recovery) time
adjustable 5–80 s
Core density
≥ 35 kg/m³ (ASTM D1622)
Compressive strength
200 kPa (ASTM D1621)
Tensile strength
≥ 250 kPa (ASTM D1623)
Closed-cell content
≥ 90% (ASTM D6226)
Flammability
Class B (ASTM E84)
Per SPC-8025 TDS; rebound time and properties tunable by formulation. Typical values for reference, not a binding specification.
Processing
Moulded Foaming Cast into earplug moulds; cream 10–15 s, gel 45–60 s, free rise 50–80 s.
Tunable Recovery Adjust formulation to set rebound time anywhere from 5 to 80 s.
10+ years in PU raw materials Specialised blended-polyol & foam-material supplier serving industry worldwide.
Custom formulation Rebound time, softness and colour tuned to your earplug.
Equipment integration Foaming machines, moulds and process support 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 earplug Tell us shape, size and target rebound time — we recommend a formulation.
2. Sample & validate Trial-mould samples; we fine-tune rebound, softness and density.
3. Scale to bulk Confirm the formula and order in bulk with flexible MOQ and tiered lead times.
Frequently Asked Questions
What is the rebound time and why does it matter?It is the time the foam takes to expand back after being compressed — adjustable from 5 to 80 s. A slower rebound lets the user roll the plug down, insert it, then let it expand to seal the ear canal.
Is SPC-8025 a finished earplug or a raw material?It is a two-component raw-material system (polyol + MDI isocyanate). Mixed and moulded, it produces finished foam earplugs.
What is the mixing ratio?SPC-A8025 : SPC-B8025 = 100 : 50 by weight, with hose / primary heat around 45–60 °C.
Can it be made in colours and different sizes?Yes — it moulds in bright colours and a range of ear-canal sizes and shapes, corded or uncorded.
Need PU foam raw material for earplugs?
Get a tailored SPC-8025 formulation, full TDS & MSDS, and a sample for moulding validation.
✓ Rebound time 5–80 s✓ TDS · MSDS · COA✓ Reply within 24 h
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