BIPB vs DCP for Crosslinking: Which Peroxide Fits Your EVA Foam, XLPE Cable and Rubber Line?
Classification: Industry News
Sep 07,2026
BIPB vs DCP for Crosslinking: Which Peroxide Fits Your EVA Foam, XLPE Cable and Rubber Line?
Choosing the right workhorse dialkyl peroxide
Dicumyl peroxide (DCP) and bis(tert-butylperoxy isopropyl)benzene (BIPB) dominate crosslinking of polyolefins and elastomers. Both release radicals that turn thermoplastics into thermosets, yet they differ in odor, dosage, processing window and cost. This guide helps EVA foam, XLPE cable and rubber processors choose the right grade - and know when switching pays off.
The chemistry in 30 seconds
Crosslinking joins polymer chains with carbon-carbon bridges so the material keeps its shape above melting point. The peroxide decomposes at processing temperature and generates radicals that abstract hydrogen from the backbone. Two numbers matter: the ten-hour half-life temperature (when decomposition starts) and the scorch margin (how long the compound can be mixed before cure begins).
Six differences that decide the grade
DCP vs BIPB at a glance
Criterion | DCP | BIPB |
Decomposition by-product | Acetophenone (persistent odor) | 1,4-diisopropylbenzene (low odor) |
Dosage for equal cure | Reference (1.0 phr) | About 0.6-0.7 phr |
10 h half-life temperature | ~117 C | ~112 C |
Scorch safety in mixing | Very good | Good, similar |
XLPE / indoor wire | Established; odor acceptable | Preferred: low odor, low outgassing |
EVA foam & footwear | Classic, economical | Growing for low-odor goods |
Price positioning | Lower cost per kg | Higher per kg; lower dosage nets similar |
Where each grade wins
XLPE cable: BIPB is increasingly preferred for indoor and automotive wire because its residue contains no acetophenone, so reels show less odor and outgassing. DCP keeps a long track record in power cable where odor is not an issue.
EVA foam and footwear: BIPB is taking share wherever indoor air quality or packaged-product odor is specified - toy foam, yoga mats, sports midsoles. DCP stays economical for dark, thick, open-mould foam where pigment masks odor.
Rubber (EPDM, NBR, HNBR): both cure well. BIPB gives slightly better heat-aged compression set in some compounds, while DCP offers predictable, well-documented cure curves.
Making the switch without risk
Moving a line from DCP to BIPB is a recipe change, not a drop-in swap. Because BIPB reaches comparable crosslink density at roughly two-thirds of the DCP dosage, start a trial at 65-70% of current phr and adjust in steps while watching cure time, foam density and modulus. Re-check the temperature profile and keep the same pigments, fillers and co-agents on both sides so the comparison stays clean.
JOHO supplies both DCP and BIPB, making side-by-side trials simple: one supplier, one COA format, one logistics lane.
Work with a peroxide specialist Need a second opinion on your peroxide grade? JOHO supplies DCP, BIPB, MEKP, BPO paste, DCBP and DBPH to processors in 40+ countries from ISO 9001, DCS-controlled plants. Send your resin, process and cure temperature for a grade recommendation and samples. www.johochemical.com |
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