Trade unions are an important actor in the social regulation of the transnational corporation. How and why trade unions engage with the continued rise of global corporate social responsibility (CSR) initiatives remains largely under-researched, particularly in transnational arenas beyond Europe. Transnational trade union networks are a concerted development intended to advance collective worker voice and influence, especially in contexts without a history of strong social dialogue. Our qualitative fieldwork centres on a transnational trade union network comprised of global, national, and local union representatives from different countries in the Asia-Pacific representing workers from one Germany-headquartered multinational corporation in the chemical sector. We examine how labour actors involved in the network engage with global CSR initiatives to advance worker voice and influence in the Asia-Pacific region. Our micro-sociological and relational approach focused on the practices, relations, and affective dimensions of building and sustaining a transnational network. What emerged is the centrality of tensions and how actors creatively utilise and shape those tensions into resources for building the network. We analyse the nature of the tensions and their effects and discuss how key actors work generatively with tensions.