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Thank you all for good suggestions. I think Friction enhancing agent will be the best in the context I have.
20 mins confidence: peer agreement (net): +2
Explanation: Just a guess from the opposite perspective.
EKM Sweden Local time: 23:59 Native speaker of: Swedish PRO pts in pair: 577
1 hr confidence: peer agreement (net): +1
Explanation: Another guess - there are also hits for anti-slip. In my opinion, these would fit in an advertising-type document, whereas a technical one might use CR Andersson's suggestion.
Hope this helps.
Helen Johnson United Kingdom Local time: 22:59 Native speaker of: English PRO pts in pair: 260