Polytek Poly 74-30 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to an amber (color varies), Shore A30 rubber. This is a pourable rubber, but it can be easily thickened with PolyFiber II Thickener for brush-on application. For a transparent, amber version of this rubber, consider Poly 74-30 Clear Liquid Rubber. For a high-tear version of this product, consider Poly 74-30 HT Liquid Rubber.
Notes:
Shake or Stir Part B before use. The color of polyurethane Part Bs may change in color from batch to batch or may darken with age, but product performance is not affected. For additional physical property specifications, refer to the Physical Properties Bulletin.
Technical Specifications
Mix Ratio by Weight: 1A:1B
Shore Hardness: A30
Pour Time: 25-30 min.
Demold Time: 16 hr.
Cured Color: Amber, Varies
Mixed Viscosity: 2,000 cP
Specific Volume: 27.5 in³/lb
Specific Gravity: 1.01
Elongation: 506 %
Tensile Strength: 281 psi
Die C Tear Strength: 62 pli
Product Literature
*N.B.: If the following links don't work, please go directly on the manufacturer website https://polytek.com/, and also to use their material calculator.
Poly 74-Series Technical Bulletin
https://polytek.com/content/pdf/technicalbulletin/Polytek_TB_74Series_5-5-2021.pdf
Safety Data Sheet - Part A
https://polytek.com/content/pdf/SDS/Polytek_SDS_74-75-A-18_08-09-2018.pdf
Safety Data Sheet - Part B
https://polytek.com/content/pdf/SDS/Polytek_SDS_74-B-18-GHS_10-02-2018.pdf
