SP-1055 (P-124)
SP-1055 is a heat reactive, brominated (3.6–4.0%) octylphenol-formaldehyde resin
that contains methylol groups. SP-1055 is very similar to SP-1056, with the main
difference being the SP-1055 having lower bromine content. The lower bromine
content yields a slower cure and allows for greater scorch safety than SP-1056. SP-1055
may be used with IIR or other unsaturated elastomers with or without functionality.
The presence of functionality allows for a faster cure. SP-1055 also does not require a
halogen donor. The use of brominated resins in compounding is especially effective
when rubber may be exposed to heat or repeated use. The rubber will not deteriorate
as quickly as rubber crosslinked with other curing agents.
UNMODIFIED CURING RESINS FOR NATURAL RUBBER
HRJ-10518 (P-180)
HRJ-10518 is a heat reactive resin made from octylphenol and formaldehyde. This resin
contains active hyroxymethyl (methylol) groups, and was developed specifically to
cure natural rubber. HRJ-10518 crosslinks rubber through C-C bridges, which results
in an inherent ozone resistant and heat resistant cured rubber system. The long alkyl
chain provides good compatibility with IIR, NR, NBR, CR and EPDM as well.
Curing Resins
Product
Ball & Ring
Softening Point (°C)
Physical Form
Methylol Content (%)
Specific Gravity
Butyl Curing
SP-1044 (P-146)
80-90
Flake
7.5 - 9.5
1.04
SP-1045 (P-101)
80-95
Flake
9.5 - 11
1.04
Bromine Modified
SP-1056 (P-125)
80 - 90
Flake
9 - 11
1.05
SP-1055 (P-124)
85 - 95
Flake
10 - 14
1.05
Natural Rubber Curing
HRJ-10518 (P-180)
80 - 95
Flake
6 - 9
1.05
11