SR235 Chlorobutyl Rubber Lining

This Chlorobutyl rubber lining material that provides general purpose chemical resistance with superior abrasion resistance. It is not meant for bleach (NaOCl) service.

Lining Specifications

Lining Code: SR235

Type: Chlorobutyl

Tie Gum: With Tie Gum

Properties: 65 +/- 5 Shore A – Chlorobutyl soft, black with Tie Gum for general purpose chemical resistance with superior abrasion resistance. Not for bleach (NaOCl) service.

Primers and Adhesive System:

  • One coat Chemlok® 289 on Metal
  • One coat Chemlok® 290 on Metal
  • One coat Chemlok® 286 on Metal
  • One coat Chemlok® 286 on Lining

Follow Lord® adhesive recommended procedures for mixing and set time.


Cure for thickness up to ¼”

Pressure, Saturated Steam (Autoclave)2 hrs. @ 30psi 275°F (135°C
Internal Steam Cure8 hrs. @ 20 psi 260°F (126°C)
Atmosphere Steam CureGradually warm until reaching 160°F (71°C) and then increase to 190°F-205°F (87°C-96°C) for 24 hrs.

Note: All reference to cure psi represents gauge pressure.

**Cure times may require tunings to compensate for low temperatures, heavy metal thicknesses, and other anomalies. Contact SRR Technical Department for recommendations on lining thicknesses over ¼”.


Ideal storage temperature is 50°F not to exceed 85°F and shelf life is 180 to 45 day range respectively.

Depending on storage conditions it may be possible to use rubber linings beyond shelf life. Please contact Salem-Republic Rubber Company for technical advisement before usage.

Designed Physical Properties

Tensile Strength PSIASTM D412
1200 min
% Elongation at Break
ASTM D412350 min
DurometerASTM D224060 +/- 5 A
Specific GravityASTM D2971.36
Adhesion to MetalASTM D42930 pli min

Skive: Closed (With Tie Gum) 

Repair lining: Same or SR236 Chemical Cure

Application Suggestions

  • Lining should be uniformly preheated to 120°F prior to applying for ease of installation, pre-shrinking. 
  • Experienced applicators may have techniques which produce equal or superior results and by no means are SRR’s application suggestions meant to replace these proven techniques. As long as those procedures fall within industry standard lining application guidelines.

Standard Dimensions

RollStandard GaugeToleranceRoll GaugeStandard RollMaximum
A Roll.120+/-.05A Roll90ft96
B Roll.180
+/-.010B Roll60ft66
C Roll.240
+.010 or -.020C Roll45ft51
3/8” Roll.360
+/-.0153/8” Roll30ft33
½“ Roll.480
+/-.015½“ Roll23ft27

*Customer specific gauges and widths, other than standard, are available upon request. Please call Salem-Republic Rubber Company at 1-877-425-5079 with any questions or more information about our Custom Elastomeric Linings.