SR235 Chlorobutyl Rubber Lining
This Chlorobutyl rubber lining material 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 Time and Temperature
Cure for thickness up to ¼”
| Pressure, Saturated Steam (Autoclave) | 2 hrs. @ 30psi 275°F (135°C |
| Internal Steam Cure | 8 hrs. @ 20 psi 260°F (126°C) |
| Atmosphere Steam Cure | Gradually 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 tuning to compensate for low temperatures, heavy metal thicknesses, and other anomalies. Contact SRR Technical Department for recommendations on lining thicknesses over ¼”.
Storage
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 PSI | ASTM D412 | 1200 min |
| % Elongation at Break | ASTM D412 | 350 min |
| Durometer | ASTM D2240 | 60 +/- 5 A |
| Specific Gravity | ASTM D297 | 1.36 |
| Adhesion to Metal | ASTM D429 | 30 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.
Standard Dimensions
| Roll | Standard Gauge | Tolerance | Roll Gauge | Standard Roll | Maximum |
|---|---|---|---|---|---|
| A Roll | .120 | +/-.05 | A Roll | 90ft | 96 |
| B Roll | .180 | +/-.010 | B Roll | 60ft | 66 |
| C Roll | .240 | +.010 or -.020 | C Roll | 45ft | 51 |
| 3/8” Roll | .360 | +/-.015 | 3/8” Roll | 30ft | 33 |
| ½“ Roll | .480 | +/-.015 | ½“ Roll | 23ft | 27 |
*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.