Rubber outsole recipe to share

Rubber outsole recipe to share

Description of neoprene sole formula:

1. This formula is mainly used in cold conditions. The characteristic is that it does not slip on ice, and change in hardness 2H does not exceed 10 degrees at a temperature of minus 23 degrees (tested);

2. It is not only frost-resistant and non-slip on ice, but also fire-resistant (flame retardant) to meet NFPA fire safety requirements, flame is self-extinguishing, and also heat-resistant and oil-resistant.

Rubber outsole recipe to share

1. Rubber outsole formula

PHR material code

CR-m40 80 Neoprene (WRT type) It is better to use medium speed with low crystallization speed, do not use NBR if speed is high because TH is bad

KBR01 14-butadiene rubber such as BR9000

Black Smoke 6 (styrene-butadiene carrier 60% N220 Black Smoke 38% STE 2%)

Silica 36, ​​preferably BH3

PEG4000 2.4 Silicon active agent

A-55 1 Active Agent (Taiwan Funded Primary Auxiliary PEG)

DOA 7.5 Oil

ZNO 4.5 is better than zinc oxide

Adhesive based on resin U-90 2.5

STE 1.1


SI-50 4.5 Binder

MGO 0.45 Magnesium Oxide

Suggested small cure (vulcanization system):

S (scatter) 11

D powder 2

NA22 2


TBZ75 2.5/1 kg

2. Rubber outsole vulcanization process

Machine pressure 150 kg/cm2

Machine temperature 155-160 degrees

Cure time 240-270 seconds

3. Rubber outsole performance indicators

Product hardness 65 degrees

Density 1.32

NBS 128 DIN 78

shrinkage 2.2%

Traction force 140

Extension 300% 82

Tear (C) 45

Tear (T) 10

Minus 23 degrees (2H) 9 degrees

Solvent resistance B 46H/70%: 65%

Resistance to diesel fuel O# 22H/20%: 28%

Resistant to isooctane 22H/12%: 12.8%

Crack growth <10 mm: 2.55 mm

Cold resistance to twisting and turning - 23 degrees 7500 crack growth <5 mm: 2.7 mm

SATRA TM144 slip test method cannot <3:

Heel slope 5 degrees, rough ice surface 0.44, smooth ice surface 0.36

Central flexure of forefoot Rough ice surface 0.30 Smooth ice surface 0.22

This formula can give black (but not oxford and white because it doesn't protect well against yellowing and soiling), revealing a little that this formula is a special formula for military boots of a certain country, if there is something. wrong, please, friends, leave a message for discussion!

Source: Unknown first author, thanks, very interesting!